Made available in DSpace on 2015-04-14T13:30:34Z (GMT). No. of bitstreams: 1 459061.pdf: 2282963 bytes, checksum: c9b1fec421065d44d34540a0b1217b0a (MD5) Previous issue date: 2014-02-24 / The aim of this study was to evaluate the bond strength of Scotchbond Universal to dentin in both total-etch and self-etch applications after storage in water for 24 h and 6 months. The occlusal surface of 24 third molars was removed to obtain flat dentin surfaces, and the teeth were divided into four groups (n=6/grupo): G1 total-etch application of Scotchbond Universal; G2 self-etch application of Scotchbond Universal; G3 Scotchbond Multi Purpose (total-etch application control); G4 Clearfil SE Bond (self-etch application control). Following the adhesive application, a 6 mm height block of composite resin Z250 was built on the adhesive area. After storage in distilled water at 37?C for 24 hours, the tooth/resin sets were cut parallel to the long axis of the tooth, in the x and y directions, with a section of about 0.8 mm2. Forty specimens were obtained for each group; 20 specimens were immediately submitted to microtensile bond strength test, and the others after storage in distilled water at 37o C for 6 months. The microtensile bond strength test was performed in an universal testing machine (EMIC-DL 2000) at 0.5 mm/min crosshead speed. The failures were observed in scanning electron microscopy (SEM). Additionally, two sets of each group were sectioned mesio-distal in the center of their crown with a diamond blade. The surfaces were polished by wet sanding with 400, 600 and 1200-grit silicon carbide abrasive paper, followed by polishing with 6, 3, 1 and ? &#61549;m diamond paste. The samples were demineralized, deproteinized, dried, metalized and observed on a scanning electron microscope at 1.500x. The bond strength means (MPa) obtained were the following: 24 h G1 (39.37); G2 (31.02); G3 (35.09); G4 (35.84); 6 months G1 (36.99); G2 (40.58); G3 (32.44); G4 (41.75). According to two-way ANOVA, there was no significance for adhesive system (p=0,110) and storage time (0,108), but the interaction of adhesive system and storage time was significant (p=0.015). At 24 h, there was no statistical difference in bond strength between the adhesive systems (p>0,05). At 6 months, there was statistical difference between the adhesive systems (p<0.05). Clearfil SE Bond obtained the higher bond strength mean, not differing statistically from self-etch application of Scotchbond Universal. Total-etch application of Scotchbond Universal did not differ statistically from Scotchbond Multi Purpose. Most of failures were mixed in both periods of evaluation. The SEM images of the adhesive interface of Scotchbond Universal total-etch application and Scotchbond Multi Purpose showed thicker hybrid layers and more resin tags in comparison with Scotchbond Universal self-etch application and Clearfil SE Bond. It was concluded that the simplification of Scotchbond Universal in one bottle did not decrease the bond strength of this adhesive to dentin during 6 months of storage. / O objetivo do estudo foi avaliar a resist?ncia de uni?o ? dentina do sistema adesivo Scotchbond Universal na vers?o total-etch e self-etch em 24 horas e 6 meses de armazenamento. A superf?cie oclusal de 24 dentes terceiros molares h?gidos foi removida para obter superf?cie plana em dentina, sendo divididos aleatoriamente em quatro grupos (n=6/grupo): G1 - Scotchbond Universal na vers?o total-etch; G2 Scotchbond Universal na vers?o self-etch; G3 Scotchbond Multi Purpose (controle da vers?o total-etch); G4 Clearfil SE Bond (controle da vers?o self-etch). Sobre o sistema adesivo foi confeccionado um bloco de 6 mm de altura em resina composta Z250. Ap?s 24 horas de armazenagem em ?gua destilada a 37? C, os conjuntos dente/resina foram cortados paralelamente no longo eixo do dente, nos sentidos x e y, com sec??o de aproximadamente 0,8 mm2. Quarenta corpos de prova foram obtidos para cada grupo, sendo 20 submetidos imediatamente ao teste de resist?ncia ? microtra??o e, os outros 20, ap?s 6 meses de armazenamento em ?gua destilada a 37? C. O ensaio de microtra??o foi realizado em uma m?quina de ensaio universal EMIC DL-2000, com uma velocidade de 0,5 mm/min. Os tipos de falha foram observados em microscopia eletr?nica de varredura (MEV). Adicionalmente, dois conjuntos dente/resina foram preparados e seccionados no sentido m?sio-distal, no centro de suas coroas, com um disco diamantado de dupla face. As superf?cies foram polidas com lixas de carbeto de sil?cio 400, 600 e 1200, seguido de polimento com pastas diamantadas de granula??o 6, 3, 1 e ? &#61549;m. As amostras foram desmineralizadas, desproteinizadas, secadas, metalizadas e observadas em MEV em aumento de 1.500 vezes. No teste de microtra??o as m?dias obtidas (MPa) foram as seguintes: 24 h G1 (39,37); G2 (31,02); G3 (35,09); G4 (35,84); 6 meses G1 (36,99); G2 (40,58); G3 (32,44); G4 (41,75). De acordo com o teste ANOVA de duas vias n?o houve signific?ncia para o sistema adesivo (p=0,110) e para o tempo (0,108), mas apenas para a intera??o entre sistema adesivo e tempo (p=0,015). No per?odo de 24 horas, n?o houve diferen?a estat?stica significativa na resist?ncia ? microtra??o entre os sistemas adesivos (p>0,05). Na avalia??o de seis meses de armazenamento, houve diferen?a estat?stica entre os sistemas adesivos (p<0,05). O Clearfil SE Bond apresentou o maior valor m?dio de resist?ncia ? microtra??o, n?o diferindo estatisticamente do Scotchbond Universal self-etch e total-etch. O Scotchbond Universal total-etch n?o diferiu estatisticamente do Scotchbond Multi Purpose. Os tipos de falha foram predominantemente mistas para os dois per?odos de avalia??o. A interface adesiva do Scotchbond Universal na vers?o total-etch e o Scotchbond Multi Purpose apresentaram camada h?brida mais espessa e mais tags de resina em compara??o ao Scotchbond Universal na vers?o self-etch e Clearfil SE Bond. Concluiu-se que a simplifica??o em frasco ?nico do Scotchbond Universal n?o causou diminui??o nos valores de resist?ncia de uni?o deste material ? dentina em at? 6 meses de avalia??o.

Made available in DSpace on 2015-04-14T13:30:36Z (GMT). No. of bitstreams: 1 460167.pdf: 3148675 bytes, checksum: 0fca29414ee88deb42284c417ac20415 (MD5) Previous issue date: 2014-03-26 / Aim: Evaluate, in vitro, the surface roughness of two composite resins submitted to a simulated wear test with three different dentifrices, applying simulated periods of six months, one year and two years of tooth brushing. Materials and Methods: Thirty-six samples of Z350XT and 36 samples of Empress Direct were built and randomly divided into three groups (n=12) according to the dentifrice used (Colgate Total 12 Clean Mint [CT12] (control), Colgate Sensitive Pro-Al?vio [CS], Oral B Pro-sa?de Whitening [OBW]). The samples were submitted to 5,000, 10,000 or 20,000 cycles of simulated tooth brushing. After each simulated period, the surface roughness of the samples was measured using a roughness tester. Results: According to three-way ANOVA, dentifrice (p=0.044) and period (p=0.000) were significant. There was no significance for the composite resin factor (p=0.381) and for the interaction (p>0.05). CT12 presented the lower surface roughness (0.269 &#956;m), not differing statistically from CS (0.300 &#956;m). The highest surface roughness was obtained for OBW (0.390 &#956;m), not differing statistically from CS. The higher value was obtained after 20,000 cycles (0.584 &#956;m) of simulated tooth brushing, differing statistically from the other two periods. Conclusions: Z350 XT and Empress Direct presented similar surface roughness after all cycles of simulated tooth brushing. The surface roughness of the composites increased with brushing time. The whitening toothpaste OBW caused higher surface roughness in both composite resins. / Objetivo: Avaliar, in vitro, a rugosidade superficial de duas resinas compostas submetidas ? escova??o simulada com tr?s diferentes dentifr?cios, em per?odos de seis meses, um ano e dois anos. Materiais e M?todos: Foram confeccionadas 36 amostras da resina composta Z350 XT e 36 da resina Empress Direct, sendo divididas aleatoriamente em tr?s grupos de 12 (n=12), conforme o dentifr?cio utilizado (Colgate Total 12 Clean Mint [CT12] (controle), Colgate Sensitive Pro-Al?vio [CS], Oral B Pro-Sa?de Whitening [OBW]). As amostras foram submetidas a 5.000, 10.000 e 20.000 ciclos de escova??o. Ap?s cada per?odo simulado, as amostras de resinas compostas tiveram a rugosidade de superf?cie mensurada por um rugos?metro. Resultados: Segundo a ANOVA de tr?s fatores, os fatores dentifr?cio (p=0,044) e tempo (p=0,000) foram significativos. N?o houve signific?ncia para o fator resina composta (p=0,381) e para a intera??o entre os fatores (p>0,05). O dentifr?cio CT12 apresentou a menor m?dia de rugosidade superficial (0,269 &#956;m), n?o diferindo estatisticamente do dentifr?cio CS (0,300 &#956;m). A maior m?dia de rugosidade superficial foi obtida com o dentifr?cio OBW (0,390 &#956;m), n?o diferindo estatisticamente do CS. A maior m?dia de rugosidade superficial foi obtida ap?s 20.000 ciclos de escova??o (0,584 &#956;m), diferindo estatisticamente dos outros tempos. Conclus?es: Z350 XT e Empress Direct apresentaram rugosidade superficial semelhante ap?s todos os ciclos de escova??o. A rugosidade superficial das resinas compostas aumentou com o tempo de escova??o. O dentifr?cio clareador OBW causou maior rugosidade de superf?cie em ambas as resinas compostas.

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

Submitted by PPG Odontologia (odontologia-pg@pucrs.br) on 2018-03-15T18:05:08Z No. of bitstreams: 1 LEONARDO_DE_CESERO_TES.pdf: 930355 bytes, checksum: 2c97f9568abe8fdc237aa889661c8a3c (MD5) / Approved for entry into archive by Tatiana Lopes (tatiana.lopes@pucrs.br) on 2018-03-27T12:23:49Z (GMT) No. of bitstreams: 1 LEONARDO_DE_CESERO_TES.pdf: 930355 bytes, checksum: 2c97f9568abe8fdc237aa889661c8a3c (MD5) / Made available in DSpace on 2018-03-27T12:27:51Z (GMT). No. of bitstreams: 1 LEONARDO_DE_CESERO_TES.pdf: 930355 bytes, checksum: 2c97f9568abe8fdc237aa889661c8a3c (MD5) Previous issue date: 2017-11-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq / The current applications of nanotechnology in dentistry include adhesive systems and composite resins, but they are still quite limited in dental materials. Dental stone is a widely used material, and the incorporation of silica nanoparticles is still unexplored. The purpose of this study is to evaluate the behavior of the mechanical properties of dental stones with the addition of silica nanoparticles at different concentrations. A total of 180 samples were prepared, 90 for each dental stone (Durone and Fuji Rock). For the control group (CG), no silica particles were added, while test group 1 (TG1) had silica nanoparticles added to 1% by weight, and test group 2 (TG2) had silica nanoparticles added to 5% by weight. The roughness, diametral tensile strength (DTS) and compressive strength were measured 24 hours after the start of spatulation. The mean roughness values for Durone were CG= 0,55, TG1= 0,36 and TG2= 0,28 ?m and for Fuji Rock were CG= 0,47, TG1= 0,31 and TG2= 0,35 ?m. The mean DTS values for Durone were CG= 6,03, TG1= 5,17 and TG2= 5,02 MPa and for Fuji Rock were CG= 6,41, TG1= 5,23 and TG2= 4,56 MPa. The mean compressive strength values for Durone were CG= 35,44, TG1= 32,70 and TG2= 32,44 MPa and for Fuji Rock were CG= 42,97, TG1= 31,22 and TG2= 29,86 MPa. Surface roughness was statistically lower for the Durone and Fuji Rock stones (p< 0,001) when silica nanoparticles were added. For DTS and compressive strength, the addition of silica nanoparticles did not lead to statistically better results when compared to the control groups (p> 0,05). / A nanotecnologia na Odontologia est? presente nos sistemas adesivos e nas resinas compostas, sendo sua aplica??o ainda bastante limitada nos materiais dent?rios. O gesso odontol?gico ? um material amplamente utilizado e a incorpora??o de nanopart?culas de s?lica ? desconhecida. O objetivo do estudo ? avaliar o comportamento das propriedades mec?nicas dos gessos odontol?gicos a partir da adi??o de nanopart?culas de s?lica em diferentes concentra??es. Foram confeccionadas 180 amostras, sendo 90 para cada gesso (Durone e Fuji Rock). No grupo controle (GC) n?o foram adicionadas part?culas, no grupo teste 1 (GT1) foram adicionadas 1% em peso e o grupo teste 2 (GT2) recebeu 5% em peso de nanopart?culas de s?lica. Os testes de rugosidade, tra??o diametral (DTS) e compress?o foram realizados ap?s 24 horas do in?cio da espatula??o. Os valores m?dios de rugosidade para o Durone foram de GC= 0,55, GT1= 0,36 e GT2= 0,28 ?m e para o Fuji Rock foram de GC= 0,47, GT1= 0,31 e GT2= 0,35 ?m. Para DTS foram de GC= 6,03, GT1= 5,17 e GT2= 5,02 MPa para o Durone e para o Fuji Rock foram de GC= 6,41, GT1= 5,23 e GT2= 4,56 MPa. Para compress?o foram de GC= 35,44, GT1= 32,70 e GT2= 32,44 MPa para o Durone e para o Fuji Rock foram de GC= 42,97, GT1= 31,22 e GT2= 29,86 MPa. Houve uma menor rugosidade superficial estatisticamente para os gessos Durone e Fuji Rock (p< 0,001) quando adicionadas nanopart?culas de s?lica. Para a DTS e compress?o n?o houve estatisticamente resultados melhores quando adicionadas nanopart?culas de s?lica em compara??o aos grupos controles (p> 0,05).

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-04-28T14:17:05Z No. of bitstreams: 1 467672.pdf: 1155191 bytes, checksum: e28fce24bd1c2748fbcead34d7bf4c08 (MD5) / Made available in DSpace on 2015-04-28T14:17:05Z (GMT). No. of bitstreams: 1 467672.pdf: 1155191 bytes, checksum: e28fce24bd1c2748fbcead34d7bf4c08 (MD5) Previous issue date: 2015-01-23 / Funda??o de Amparo ? Pesquisa do Estado do Rio Grande do Sul - FAPERGS / The objectives of this in vitro study were: 1) to evaluate the surface roughness of a composite resin covered by sealing surface containing inorganic filler or not, subject to brushing; 2) to analyze, with the aid of scanning electron microscopy, the presence of the sealant after 48 months of simulated toothbrushing; 3) verify that the type of toothpaste reduces the useful life of sealants; 4) verify the presence of inorganic filler prevents the increase in roughness forward to brushing. For this, 54 samples were made of composite resin and divided into nine groups: G1 - without composite sealant (control); G2 - Sealant Fortify, toothpaste Colgate Professional Whitening; G3 - Fortify, Colgate Total Clean Mint; G4 - Fortify, Edel White Whitening; G5 - Fortify, Edel White Gum Care; G6 - Fortify Plus, Colgate Whitening Professional; G7 - Fortify Plus, Colgate Total Clean Mint; G8 - Fortify Plus White Whitening Edel; G9 - Fortify Plus, Edel White Gum Care and analyzed the simulated periods of brushing (12,24, 36 and 48 months). Reading roughness was performed at baseline and after each simulated toothbrushing period, using a surface roughness (SJ 201 Mututoyo).Two specimens of each group were observed by SEM. The data were submitted to ANOVA and Tukey's test (5%). There was a significant difference between the two sealants, with the sealant Fortify Plus rougher. Among the toothpaste, Colgate Clean Mint associated with Fortify Plus sealant obtained the higher roughness values. Lower values were associated with Gum Care Fortify sealant. The protective layer formed by the sealant remained partially by the end of 48 months of brushing, maintaining the smoothness of the composite. We conclude that both sealants guaranteed protection of the composite, and the Fortify Plus rougher for all assessed toothpastes. Clinical significance: The roughness of the surface sealant is changed for different toothpastes and different times of brushing and the addition of inorganic filler in sealants promotes different performances in relation to surface roughness. / Os objetivos deste estudo in vitro foram: 1) avaliar a rugosidade de superf?cie de uma resina composta coberta por selantes de superf?cie contendo carga inorg?nica ou n?o, submetidas ? escova??o simulada; 2) analisar, com aux?lio da microscopia eletr?nica de varredura, a presen?a dos selantes ap?s 48 meses de escova??o simulada; 3) verificar se o tipo de dentifr?cio diminui o tempo de vida ?til dos selantes; 4) verificar se a presen?a de carga inorg?nica previne o aumento da rugosidade frente ? escova??o. Para isto, foram confeccionadas 54 amostras de resina composta e divididas em nove grupos: G1 ? comp?sito sem selante (controle); G2 ? Selante Fortify, dentifr?cio Colgate Professional Whitening; G3 ? Fortify, Colgate Total Clean Mint; G4 ? Fortify, Edel White Branqueador; G5 ? Fortify, Edel White Gum Care; G6 ? Fortify Plus, Colgate Professional Whitening; G7 ? Fortify Plus, Colgate Total Clean Mint; G8 ? Fortify Plus Edel White Branqueador; G9 ? Fortify Plus, Edel White Gum Care e analisados nos per?odos simulados de escova??o de 12, 24, 36 e 48 meses. A leitura da rugosidade foi realizada no baseline e ap?s cada per?odo de escova??o simulada, utilizando um rugos?metro de superf?cie (SJ 201 Mututoyo). Dois corpos de prova de cada grupo foram observados em MEV.Os dados foram submetidos ? ANOVA e Teste de Tukey (5%). Verificou-se diferen?a significativa entre os dois selantes, sendo o selante Fortify Plus mais rugoso. Entre os dentifr?cios, o Colgate Clean Mint associado ao selante Fortify Plus obteve os maiores valores de rugosidade. Os menores valores observados foram com Gum Care associado ao selante Fortify. A camada de prote??o formada pelos selantes permaneceu parcialmente at? o final de 48 meses de escova??o, mantendo a lisura do comp?sito. Conclui-se que ambos os selantes garantiram prote??o da resina composta, sendo o Fortify Plus mais rugoso para todos os dentifr?cios avaliados. Signific?ncia cl?nica: A rugosidade dos selantes de superf?cie ? alterada em fun??o de diferentes dentifr?cios e diferentes tempos de escova??o e a adi??o de carga inorg?nica nos selantes promove desempenhos diferentes em rela??o ? rugosidade superficial.

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-05-22T11:14:29Z No. of bitstreams: 1 469172 - Texto Completo.pdf: 823400 bytes, checksum: 095e93ad0abe67b38883346b9108692f (MD5) / Made available in DSpace on 2015-05-22T11:14:29Z (GMT). No. of bitstreams: 1 469172 - Texto Completo.pdf: 823400 bytes, checksum: 095e93ad0abe67b38883346b9108692f (MD5) Previous issue date: 2015-03-25 / Introduction: the objective of this study was to evaluate the temperature variation of the pulp chamber during brackets bonding in different teeth types, with and without primer and in healthy or filled teeth. Materials and Methods: ninety human permanent teeth were used, 30 mandibular incisors, 30 maxillary bicuspid and 30 mandibular third molars, which were divided into 9 groups according to bonding technique (with or without light-curing primer), tooth type, filled or healthy tooth and thickness. A K-type thermocouple connected in a digital thermometer was introduced into the pulp chamber. Periapical radiographs were taken to check the thermocouple positioning and the brackets were bonded using a LED. The initial and maximum temperature reached during light curing were used to calculate the temperature variation. Results: the ANCOVA analysis showed that the bonding technique and tooth type (p?0.05) influenced the temperature variation. There was a greater increase in temperature using primer. Regarding the tooth type, the incisors experienced a major temperature increase, followed by molars and bicuspids. There was no statistically significant difference for healthy or filled teeth groups and thickness factor. Conclusion: a molar showed the lowest temperature variation with 0.2?C and a lower incisor with the greatest variation of 4.3?C. The bonding technique using primer and adhesive caused a greater temperature range compared to the bonding with adhesive only. The mandibular incisor obtained a greater temperature range, then the molar and bicuspid. Therefore, the brackets bonding didn`t exceed the 5,5?C recommended for the pulp health maintenance. Key words: light curing of dental adhesives, thermometers, braces, hot temperature, orthodontics. / ntrodu??o: o objetivo desse estudo foi avaliar a varia??o de temperatura da c?mara pulpar durante a colagem de br?quetes em diferentes tipos de dentes, com e sem utiliza??o de primer e em dentes h?gidos e restaurados. Materiais e M?todos: foram utilizados 90 dentes permanentes humanos, sendo 30 incisivos inferiores, 30 primeiros pr?-molares superiores e 30 terceiros molares inferiores, divididos em 9 grupos de acordo com a t?cnica de colagem, com ou sem primer, tipo de dente e se o dente era h?gido ou restaurado. Um termopar tipo K foi introduzido na c?mara pulpar e conectado ? um term?metro digital. Radiografias periapicais foram realizadas para conferir o posicionamento do termopar no interior da c?mara pulpar e os br?quetes foram colados utilizando um LED. As temperaturas inicial e m?xima atingida durante a fotopolimeriza??o foram utilizadas para calcular a varia??o da temperatura. Resultados: a an?lise de ANCOVA mostrou que a varia??o de temperatura foi influenciada pela t?cnica de colagem e pelo tipo de dente (p?0,05). Utilizando primer houve um maior aumento de temperatura em rela??o ao grupo sem primer. Quanto ao tipo de dente, os incisivos sofreram um maior aumento de temperatura, seguido dos molares e pr?-molares. N?o houve diferen?a estatisticamente significativa para os grupos de dentes h?gidos ou restaurados e para o fator espessura. Conclus?o: o dente que obteve menor varia??o de temperatura foi um molar com 0,2?C e, um incisivo inferior, com a maior varia??o, de 4,3?C. A t?cnica de colagem utilizando primer e adesivo causou uma varia??o de temperatura maior se comparado ? colagem apenas do adesivo. O incisivo inferior obteve uma maior varia??o de temperatura, seguida do molar e pr?-molar. Portanto, a colagem de br?quetes n?o excedeu os 5,5?C preconizados para manuten??o da sa?de pulpar.

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-06-15T11:26:51Z No. of bitstreams: 1 468076 - Texto Completo.pdf: 1121444 bytes, checksum: 65fc7c05be36d73bf2d8b7f5853d6a61 (MD5) / Made available in DSpace on 2015-06-15T11:26:51Z (GMT). No. of bitstreams: 1 468076 - Texto Completo.pdf: 1121444 bytes, checksum: 65fc7c05be36d73bf2d8b7f5853d6a61 (MD5) Previous issue date: 2013-11-29 / OBJECTIVE : The objective of this study was to evaluate in 6 months Class V restorations clinically with composite resin ( Glacier ) and glass ionomer cement ( Riva selfcure ) with the direct technique and restorations semidirect technique, cemented with self-adhesive resin cement ( SeT ) and total etching cement ( RelyX ARC ) . MATERIAL AND METHODS : One hundred and twenty restorations were performed by a single operator in 30 patients . Each patient received a composite resin restoration ( RGLA ) , glass ionomer cement ( RVA ) , ceromer cemented with RelyX ARC ( RARC ) , and cemented with SeT (RSET ) . After 6 months, the evaluation was performed using the USPHS criteria for the presence of restoration, marginal integrity , color and presence of secondary caries . RESULTS : The results were obtained through statistical analysis of generalized linear mixed model and showed that only the restorations cemented with SeT were statistical difference , with significant loss of restorations . No patient had secondary caries after 6 months of evaluation . The marginal integrity and color were not significantly different between groups . CONCLUSION : We conclude that restorations cement with self-adhesive SeT failed . Thus the direct restorations had a better behavior than the semidirect restorations. However semidirects restorations cemented with Adper Single Bond 2 + RelyX ARC and total etching presented along with the RVA group the highest predictive average. / OBJETIVO: O Objetivo deste trabalho foi avaliar clinicamente no per?odo de 6 meses restaura??es classe V em resina composta (Glacier) e cimento de ion?mero de vidro (Riva selfcure) pela t?cnica direta, e restaura??es com cer?mero pela t?cnica semidireta cimentadas com cimento resinoso autoadesivo (SeT) e com condicionamento total (RelyX ARC). MATERIAL E M?TODO: Cento e vinte restaura??es foram realizadas por um ?nico operador em 30 pacientes. Cada paciente recebeu uma restaura??o de resina composta (RGLA), Cimento de ion?mero de vidro (RVA), cer?mero cimentada com RelyX ARC (RARC), e cer?mero cimentada com SeT (RSET). Ap?s 6 meses as avalia??es foram realizadas atrav?s dos crit?rios do USPHS modificado quanto ? presen?a da restaura??o, integridade marginal, descolora??o marginal e presen?a de c?rie secund?ria. RESULTADOS: Os resultados foram obtidos atrav?s da an?lise estat?stica de modelo linear misto generalizado e mostraram que somente as restaura??es de cer?mero cimentadas com SeT apresentaram diferen?a estat?stica, com perda significativa das restaura??es. Nenhum paciente apresentou c?rie secund?ria ap?s os 6 meses de avalia??o. A integridade marginal e descolora??o marginal n?o apresentaram diferen?a estat?stica entre os grupos. CONCLUS?O: Conclu?mos que as restaura??es realizadas com cimento autoadesivo SeT falharam. Desta forma as restaura??es diretas tiveram um comportamento melhor que as restaura??es semidiretas. Todavia as restaura??es semidiretas cimentadas com Adper Single Bond 2 + RelyX ARC e condicionamento ?cido total apresentaram junto com o grupo RVA a maior m?dia preditiva.

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-06-17T18:27:45Z No. of bitstreams: 1 470532 - Texto Completo.pdf: 1614440 bytes, checksum: e43e90ac45fd2b22f0d595dd9c475e47 (MD5) / Made available in DSpace on 2015-06-17T18:27:45Z (GMT). No. of bitstreams: 1 470532 - Texto Completo.pdf: 1614440 bytes, checksum: e43e90ac45fd2b22f0d595dd9c475e47 (MD5) Previous issue date: 2015-03-04 / This study aimed to evaluate "in vitro" possible changes on prosthetic retaining screws on implants with platform external hexagon, this because the loosening this component is very common in clinical dentistry practice. Were assessed screws of UCLA's pillars of titanium Neodent? brand and 3i BIOMET? and of titanium with surface treated with tungsten carbide Neodent? brand. Two techniques of utilization of the screws were compared, the technique I, recommended by the manufacturer with only the definitive torque, and the technique II , utilized in broad scale in Brazil where multiple torques are applied in the same screw simulating the clinical steps, up to definitive installation. The initial weight of all the screws (T0) was registered, in the screws of technique I, it was given definitive torque (32N.cm to Neodent? and 20N.cm to 3i BIOMET?) submitted to mechanical cycling and the final weight (TF) registered. In the screws of technique II have been applied opening and closing cycles, and their weights registered (T1, T2 and T3) before applying the definitive torque and mechanical cycling after the final weight has been registered (TF). The morphologies and the surface compositions of the screws were evaluated using SEM and EDS at each time. The results showed significant weight loss in the three screws groups, of technique I (p = 0.005 for uncoated Neodent?, p = 0.007 for coated Neodent? and p = 0.001 to 3i BIOMET?) and on two the steps of the three groups of technique II (p <0.001 for all groups), and comparing the final weight of the screws of the two techniques, the screws of the technique I, showed significantly higher values than the screws, of the technique II (p = 0.007 for uncoated Neodent?, p = 0.009 for coated Neodent? and p = 0.001 to 3i BIOMET?), as well as SEM showed less permanent deformation for the technique I. EDS showed no major changes in the surface compositions. Therefore, the use of the definitive screw only at time of final torque can minimize problems regarding to the loosening the retaining screws of implant supported prostheses. / O presente estudo teve como objetivo avaliar ?in vitro? poss?veis altera??es em parafusos de reten??o de pr?teses sobre implantes com plataforma hex?gono externo, isto porque o afrouxamento deste componente ? muito frequente na pr?tica cl?nica odontol?gica. Foram avaliados parafusos de pilares UCLA de tit?nio da marca Neodent? e 3i BIOMET? e de tit?nio com superf?cie tratada com carboneto de tungst?nio da marca Neodent?. Duas t?cnicas de utiliza??o dos parafusos foram comparadas, a t?cnica I, recomendada pelo fabricante com apenas o torque definitivo, e a t?cnica II, utilizada em grande escala no Brasil onde s?o aplicados m?ltiplos torques no mesmo parafuso, simulando as etapas cl?nicas at? a instala??o definitiva. Foi registrado o peso inicial de todos os parafusos (T0), nos parafusos da t?cnica I foi dado torque definitivo (32N.cm para Neodent? e 20N.cm para 3i BIOMET?), submetidos a ciclagem mec?nica e registrado o peso final (TF). Nos parafusos da t?cnica II foram aplicados ciclos de abertura e fechamento e seus pesos registrados (T1, T2 e T3) antes da aplica??o do torque definitivo e ciclagem mec?nica, ap?s o peso final foi registrado (TF). As morfologias e as composi??es de superf?cie dos parafusos foram avaliadas atrav?s de MEV e EDS em cada tempo. Os resultados evidenciaram perda significativa de peso nos tr?s grupos de parafusos da t?cnica I (p=0,005 para Neodent? sem revestimento, p=0,007 para Neodent? com revestimento e p=0,001 para 3i BIOMET?) e em duas das etapas dos tr?s grupos da t?cnica II (p<0,001 para todos os grupos), sendo que comparando o peso final dos parafusos das duas t?cnicas, os parafusos da t?cnica I apresentaram valores significativamente maiores que os parafusos da t?cnica II (p=0,007 para Neodent? sem revestimento, p=0,009 para Neodent? com revestimento e p=0,001 para 3i BIOMET?), assim como a MEV evidenciou menor deforma??o permanente para a t?cnica I. EDS n?o apresentou grandes altera??es nas composi??es de superf?cie. Portanto, a utiliza??o do parafuso definitivo apenas no momento do torque final pode minimizar problemas com rela??o ao afrouxamento de parafusos de reten??o de pr?teses implanto suportadas.

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-07-30T17:52:46Z No. of bitstreams: 1 472789 - Texto Completo.pdf: 2619919 bytes, checksum: ed658917522947aaf046eb032864fcc4 (MD5) / Made available in DSpace on 2015-07-30T17:52:46Z (GMT). No. of bitstreams: 1 472789 - Texto Completo.pdf: 2619919 bytes, checksum: ed658917522947aaf046eb032864fcc4 (MD5) Previous issue date: 2015-03-09 / This study aimed to evaluate "in vitro" possible changes on prosthetic retaining screws on implants with platform external hexagon, this because the loosening this component is very common in clinical dentistry practice. Were assessed screws of UCLA's pillars of titanium Neodent? brand and 3i BIOMET? and of titanium with surface treated with tungsten carbide Neodent? brand. Two techniques of utilization of the screws were compared, the technique I, recommended by the manufacturer with only the definitive torque, and the technique II , utilized in broad scale in Brazil where multiple torques are applied in the same screw simulating the clinical steps, up to definitive installation. The initial weight of all the screws (T0) was registered, in the screws of technique I, it was given definitive torque (32N.cm to Neodent? and 20N.cm to 3i BIOMET?) submitted to mechanical cycling and the final weight (TF) registered. In the screws of technique II have been applied opening and closing cycles, and their weights registered (T1, T2 and T3) before applying the definitive torque and mechanical cycling after the final weight has been registered (TF). The morphologies and the surface compositions of the screws were evaluated using SEM and EDS at each time. The results showed significant weight loss in the three screws groups, of technique I (p< 0.005 for uncoated Neodent?, p = 0.001 for coated Neodent? and p < 0.001 to 3i BIOMET?) and on one step of the uncoated Neodent? group and two steps of the other two groups of technique II (p <0.001 for all groups), and comparing the final weight of the screws of the two techniques, only the uncoated Neodent? screws of the technique I, showed significantly higher values than the screws, of the technique II (p = 0.021 for uncoated Neodent?, p = 0.089 for coated Neodent? and p = 0.095 to 3i BIOMET?), as well as SEM showed less permanent deformation for the technique I of these screws. EDS showed no major changes in the surface compositions. Therefore, the use of the definitive screw only at time of final torque would not necessarily minimize problems regarding to the loosening the retaining screws of implant supported prostheses. / O presente estudo teve como objetivo avaliar ?in vitro? poss?veis altera??es em parafusos de reten??o de pr?teses sobre implantes com plataforma hex?gono interno, pois o afrouxamento deste componente ? muito frequente na pr?tica cl?nica odontol?gica. Foram avaliados parafusos de pilares UCLA de tit?nio da marca Neodent? e 3i BIOMET? e de tit?nio com superf?cie tratada com carboneto de tungst?nio da marca Neodent?. Duas t?cnicas de utiliza??o dos parafusos foram comparadas, a t?cnica I, recomendada pelo fabricante com apenas o torque definitivo, e a t?cnica II, procedimento que ? comumente realizado pelos profissionais no Brasil, onde s?o aplicados m?ltiplos torques no mesmo parafuso, simulando as etapas cl?nicas at? a instala??o definitiva. Foi registrado o peso inicial de todos os parafusos (T0), nos parafusos da t?cnica I foi dado torque definitivo (32N.cm para Neodent? e 20N.cm para 3i BIOMET?), submetidos a ciclagem mec?nica e registrado o peso final (TF). Nos parafusos da t?cnica II foram aplicados ciclos de abertura e fechamento e seus pesos registrados (T1, T2 e T3) antes da aplica??o do torque definitivo e ciclagem mec?nica, ap?s o peso final foi registrado (TF). As morfologias e as composi??es de superf?cie dos parafusos foram avaliadas atrav?s de MEV e EDS em cada tempo. Os resultados evidenciaram perda significativa de peso nos tr?s grupos de parafusos da t?cnica I (p<0,001 para Neodent? sem revestimento, p=0,001 para Neodent? com revestimento e p<0,001 para 3i BIOMET?), e em uma das etapas do grupo Neodent sem cobertura e duas etapas dos outros dois grupos da t?cnica II (p<0,001 para todos os grupos), sendo que comparando o peso final dos parafusos das duas t?cnicas, apenas os parafusos Neodent? sem revestimento da t?cnica I apresentaram valores significativamente maiores que os parafusos da t?cnica II, (p=0,021 para Neodent? sem revestimento, p=0,089 para Neodent? com revestimento e p=0,095 para 3i BIOMET?), do mesmo modo a MEV evidenciou menor deforma??o permanente para a t?cnica I desses parafusos. EDS n?o apresentou grandes altera??es nas composi??es de superf?cie. Portanto, a utiliza??o do parafuso definitivo apenas no momento do torque final n?o minimizar? necessariamente problemas com rela??o ao afrouxamento de parafusos de reten??o de pr?teses implanto suportadas.

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2016-02-11T10:24:45Z No. of bitstreams: 1 DIS_TIAGO_KUNZ_COMPLETO.pdf: 2813092 bytes, checksum: 4a31e9fa6f6b00754e7f702733f5c592 (MD5) / Made available in DSpace on 2016-02-11T10:24:45Z (GMT). No. of bitstreams: 1 DIS_TIAGO_KUNZ_COMPLETO.pdf: 2813092 bytes, checksum: 4a31e9fa6f6b00754e7f702733f5c592 (MD5) Previous issue date: 2015-11-30 / Screw loosening is often a complication reported in prosthetic implants. The torque develops a compressive clamping force between parts called preload, which holds the components together and the reducing of friction between the surfaces has been shown to increase its value. Dry lubricants, also called coatings have been used and the results are satisfactory, but the use of liquid lubricants is still little explored, which is the aim of this study. For this, 14 titanium screws and 14 screws with (Diamond-Like Carbon) DLC coating were randomly assigned to four groups (Titanium; DLC, Titanium with oil, and DLC with oil) and subjected to five cycles of tightening and loosening. The screws of groups Titanium with oil and DLC with oil were lubricated with castor oil. The preload was measured by a preload gauge cell, especially developed for the study. The results of preloads and average removal torques for torques of 20 and 32Ncm at 2 different times were analyzed: after the first grip and after five consecutive grips. At the end of the analysis, the thread pitches were measured to rule out plastic deformation. The Group DLC had higher pre-load values at all time points, but it was only significant after the sequence grips with 32 Ncm, and in the absence of oil. It was concluded, therefore, that the castor oil lubrication was not able to significantly increase the preload values or removal torque. / O afrouxamento do parafuso ? uma complica??o frequentemente reportada em pr?teses sobre implantes. O torque desenvolve uma for?a compressiva de aperto entre as partes chamada pr?-carga, que mant?m os componentes unidos, e a redu??o do atrito entre as superf?cies tem demonstrado aumentar o seu valor. Lubrificantes secos, tamb?m chamados de recobrimentos, t?m sido utilizados e os resultados s?o satisfat?rios, contudo o emprego de lubrificantes l?quidos ainda ? pouco explorado, sendo o objetivo deste estudo. Para isso, 14 parafusos de tit?nio e 14 parafusos com recobrimento de Diamond-Like Carbon (DLC) foram aleatoriamente alocados em quatro grupos (Tit?nio; DLC; Tit?nio com ?leo; e DLC com ?leo) e submetidos a cinco ciclos de aperto e desaperto. Os parafusos dos grupos Tit?nio com ?leo e DLC com ?leo foram lubrificados com ?leo de mamona. A pr?-carga foi mensurada por meio de uma c?lula aferidora de pr?-carga, desenvolvida especialmente para o estudo. Foram analisados os resultados das pr?-cargas e torques de remo??o m?dios para os torques de 20 e 32 Ncm em dois momentos distintos: ap?s o primeiro aperto e depois de cinco apertos consecutivos. Ao fim das an?lises, os passos de roscas foram mensurados para descartar deforma??es pl?sticas. O Grupo DLC apresentou maiores valores de pr?-carga em todos os momentos de avalia??o, contudo ele s? foi significativo ap?s a sequ?ncia de apertos com 32 Ncm, e na aus?ncia do ?leo. Concluiu-se, portanto, que a lubrifica??o com ?leo de mamona n?o foi capaz de aumentar significativamente os valores da pr?-carga ou do torque de remo??o.