Submitted by PPG Odontologia (odontologia-pg@pucrs.br) on 2018-03-19T17:50:17Z No. of bitstreams: 1 TAMARA_PALUDO_DIS.pdf: 786437 bytes, checksum: 24d142989a1f4e1aac8bb4a9d2a1548c (MD5) / Approved for entry into archive by Tatiana Lopes (tatiana.lopes@pucrs.br) on 2018-04-04T11:42:36Z (GMT) No. of bitstreams: 1 TAMARA_PALUDO_DIS.pdf: 786437 bytes, checksum: 24d142989a1f4e1aac8bb4a9d2a1548c (MD5) / Made available in DSpace on 2018-04-04T11:50:01Z (GMT). No. of bitstreams: 1 TAMARA_PALUDO_DIS.pdf: 786437 bytes, checksum: 24d142989a1f4e1aac8bb4a9d2a1548c (MD5) Previous issue date: 2018-01-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / (Artigo 1 Effect of a collagen stabilizing acid conditioner on adhesion to enamel and dentin) The aim was to evaluate the effect of different concentrations of phosphoric acid with grape seed extract (GSE) on the enamel acid etching, on the immediate bond strength to enamel, and on the bond strength to dentin after 12 months storage. Three different phosphoric acid formulations with GSE were obtained: GSE5 - 5% phosphoric acid + 20% ethanol + 2% GSE; GSE10 -10% phosphoric acid + 20% ethanol + 2% GSE; GSE20 - 20% phosphoric acid + 20% ethanol + 2% GSE; GC (control) - 37% phosphoric acid. The enamel and dentin surfaces of third molars, extracted for therapeutic reasons, were etched with 37% phosphoric acid for 15 s, and with the modified acids for 30 s. The acid was rinsed, followed by application of Adper Scotchbond Multipurpose adhesive system, and a block of composite resin was built. In enamel, the etching pattern was evaluated by scanning electron microscopy (SEM) and the bond strength was evaluated by conventional tensile test. In dentin, the microtensile bond strength (?TBS) was evaluated after 24 h and 1 year of storage. SEM images showed that GSE5 caused a more superficial enamel etching. According to ANOVA and Tukey?s test, enamel bond strength did not differ significantly between GC (49.00 MPa), GSE5 (42.78 MPa), GSE10 (51.55 MPa) and GSE 20 (36.18 MPa) (p> 0.05).According to two-way ANOVA and Tukey?s test, the interaction of factors (treatment x storage time) was significant (p=0.0001). At the 24 h of storage, GC (28.43 MPa) obtained the highest ?TBS, and did not differ significantly from GSE20 (24.11 MPa). GC and GSE20 were significantly higher to the others (p<0.05).The GSE10 (17.53 MPa) and GSE5 (16.75 MPa) did not differ significantly from each other. At the 12 months of storage, there was no significant difference in ?TBS between GC (17.71 MPa), GSE5 (20.97 MPa), GSE10 (17.59 MPa) and GSE20 (18.52 MPa). Only GSE5 and GSE10 did not significantly decrease ?TBS after 12 months of storage. It was concluded that GSE5 caused a more superficial enamel etching pattern in relation to the acid concentrations at 37%, 20% and 10%. However, there was no significant difference in the bond strength to enamel among the four concentrations. GSE5 and GSE10 promoted stability of the bond strength to dentin after 12 months of storage. (Artigo 2 Effect of phosphoric acid with polyphenols on dentin collagen : Atomic force microscopy study) Objective: The aim was of this study to evaluate the effect of different concentrations of phosphoric acid with grape seed extract (GSE) on the structure of the collagen fibrils of dentin. Materials and methods: Samples (0.3 mm thickness and 8 mm diameter) of the middle third of the coronal dentin of sound human molars were obtained. Half of the dentin of each tooth was etched with phosphoric acid (5%, 10%, or 20%) for 30 s, and the other half was etched with its corresponding phosphoric acid with 2% GSE for 30 s. The dentin of each sample was observed using an Atomic Force Microscope (AFM). Results: AFM images showed that phosphoric acid at concentrations of 5%, 10% and 20% demineralized the dentin and exposed the collagen fibrils and their pattern of periodicity. Phosphoric acid at each concentration with 2% GSE changed the collagen fibril periodicity, and the collagen fibrils formed globular structures. This change was more significant in dentin treated with 5% phosphoric acid and less significant with 20% phosphoric acid. Conclusions: The use of 5% phosphoric acid with 2% GSE produced denser collagenous globular structures. This conformational change in the collagen can make it more mechanically and enzymatically resistant. / (Artigo 1 Efeito de um condicionador ?cido estabilizador de col?geno na ades?o ao esmalte e ? dentina) O objetivo foi avaliar o efeito de diferentes concentra??es de ?cido fosf?rico com extrato de semente de uva (GSE) no padr?o de condicionamento ?cido em esmalte, na resist?ncia de uni?o imediata ao esmalte e ap?s 12 meses de armazenamento em dentina. Tr?s diferentes formula??es de ?cido fosf?rico com GSE foram obtidas: GSE5 - 5% de ?cido fosf?rico + 20% de etanol + 2% de GSE; GSE10 -10% de ?cido fosf?rico + 20% de etanol + 2% de GSE; GSE20 - 20% de ?cido fosf?rico + 20% de etanol + 2% de GSE; GC (controle) - ?cido fosf?rico 37%. As superf?cies do esmalte e da dentina de dentes terceiros molares, extra?dos por raz?es terap?uticas, foram condicionadas com ?cido fosf?rico 37% por 15 s e com os ?cidos modificados por 30 s, seguido de lavagem e aplica??o do sistema adesivo Adper Scotchbond Multiuso (convencional de tr?s passos) e da constru??o de um bloco em resina composta. Em esmalte, o padr?o de condicionamento foi avaliado em microscopia eletr?nica de varredura (MEV) e a resist?ncia de uni?o foi avaliada pelo ensaio de tra??o convencional. Em dentina, a resist?ncia de uni?o ? microtra??o (R?T) foi avaliada ap?s 24 h e 12 meses de armazenamento. As imagens em MEV evidenciaram que o GSE5 causou um condicionamento mais superficial do esmalte. De acordo com ANOVA de 2 fatores e Tukey, a resist?ncia de uni?o ao esmalte n?o diferiu estatisticamente entre GC (49,00 MPa), GSE5 (42,78 MPa), GSE10 (51,55 MPa) e GSE20 (36,18 MPa) (p>0,05). De acordo com ANOVA de duas vias e Tukey, a intera??o tratamento x tempo de armazenamento foi significativa (p=0,0001). No tempo de armazenamento de 24 h, GC (28,43 MPa) obteve a maior R?T, n?o diferindo estatisticamente do grupo GSE20 (24,11 MPa), sendo ambos estatisticamente superiores aos demais (p<0,05). O grupo GSE10 (17,53 MPa) e o GSE5 (16,75 MPa) n?o diferiram estatisticamente entre si. No tempo de armazenamento de 12 meses, n?o houve diferen?a estat?stica na R?T entre o GC (17,71 MPa), GSE5 (20,97 MPa), GSE10 (17,59 MPa) e GSE20 (18,52 MPa). Apenas GSE5 e GSE10 n?o tiveram redu??o significativa da R?T ap?s 12 meses de armazenamento. Concluiu-se que o GSE5 causou um condicionamento mais superficial do esmalte em rela??o ?s concentra??es de 37%, 20% e 10%. No entanto, n?o houve diferen?a estat?stica nos valores de resist?ncia ? tra??o imediata ao esmalte entre as quatro concentra??es. GSE5 e GSE10 promoveram a estabilidade da resist?ncia de uni?o ? dentina ap?s 12 meses de armazenamento.

Made available in DSpace on 2014-12-17T14:13:27Z (GMT). No. of bitstreams: 1 MariaCSM_Capa_ate_cap4.pdf: 6011904 bytes, checksum: 63effbb0509556702ce462b8f08c7651 (MD5) Previous issue date: 2008-04-11 / The aim of the present study was to assess the effectiveness and adverse effects on dental enamel caused by nightguard vital bleaching with 10% carbamide peroxide. This was accomplished through the interaction of researchers from different areas such as dentistry, materials engineering and physics. Fifty volunteers took part in the doubleblind randomized controlled clinical trial. They were allocated to an experimental group that used Opalescence PF 10% (OPA) and a control group that used a placebo gel (PLA). Fragments of human dental enamel from the vestibular surface of healthy premolars, extracted for orthodontic reasons, were fixed to the vestibular surface of the first upper molars of the volunteers for in situ observation. Bleaching was performed at night for 21 days. The observation periods included Baseline (BL), T0 (21 days), T30 (30 days after treatment) and T180 (180 days after treatment, only for the OPA group). Tooth color was assessed by comparing it with the Vita? scale and by the degree of satisfaction expressed by the volunteer. We also assessed adverse clinical effects, dental sensitivity and gingival bleeding. The study of adverse effects on enamel was conducted in vivo and in situ, using the DIAGNOdent? laser fluorescence device to detect mineral loss. Scanning electron microscopy (SEM) was used to check for superficial morphological alterations, energy dispersive spectrophotometry (EDS) to semiquantitatively assess chemical composition using the Ca/P ratio, and the x-ray diffraction (XRD) technique to observe alterations in enamel microstructure. The results showed that nightguard vital bleaching with 10% carbamide peroxide was effective in 96% of the cases, versus 8% for the PLA group. Dental sensitivity was present in 36% (9/25) of the cases. There was no significant association between gingival bleeding and the type of gel used (p = 1.00). In vivo laser fluorescence analysis showed no difference in values for the control group, whereas in the OPA group there was a statistically significant difference between baseline values in relation to the subsequent periods (p<0.01), with lower mean values for post-bleaching times. There was a significant difference between the groups for times T0 and T30. Micrographic analysis showed no enamel surface alterations related to the treatment performed. No significant alteration in Ca/P ratio was observed in the OPA group (p = 0.624) or in the PLA group (p = 0.462) for each of the observation periods, nor between the groups studied (p=0.102). The XRD pattern for both groups showed the presence of three-phase Hydroxyapatite according to JCPDS files (9-0432[Ca5(PO4)3(OH)], 18-0303[Ca3(PO4)2.xH2O] and 25-0166[Ca5(PO4)3(OH, Cl, F)]). No other peak associated to other phases was found, independent of the group analyzed, which reveals there was no disappearance, nucleation or phase transformation. Neither was there any alteration in peak pattern location. With the methodology and protocol used in this study, nightguard vital bleaching with 10% carbamide peroxide proved to be an effective and safe procedure for dental enamel / O presente estudo objetivou avaliar a efetividade e os efeitos adversos sobre o esmalte dent?rio promovidos pelo clareamento caseiro supervisionado pelo dentista com per?xido de carbamida a 10% e s? foi poss?vel mediante a intera??o de alguns pesquisadores das mais variadas ?reas do conhecimento como a Odontologia, a Engenharia de Materiais e a F?sica. Cinq?enta volunt?rios participaram de um ensaio cl?nico controlado e randomizado duplo-cego e foram alocados em um grupo experimental, que utilizou Opalescence PF 10% (OPA) e um grupo controle que usou um gel placebo (PLA). Fragmentos de esmalte dent?rio humano provenientes da face vestibular de pr?-molares h?gidos, extra?dos por motivos ortod?nticos, foram fixados ? superf?cie vestibular dos primeiros molares superiores dos volunt?rios objetivando uma observa??o in situ. O tempo do clareamento foi de 21 dias em regime noturno. Os per?odos de observa??o compreenderam a Linha Base (LB), T0 (21 dias), T30 (30 dias ap?s o tratamento) e T180 (180 dias ap?s o tratamento) sendo este ?ltimo apenas para o grupo OPA. A avalia??o da cor dos dentes foi feita pela compara??o com a escala Vita? e atrav?s do grau de satisfa??o do volunt?rio em rela??o ao tratamento. Adicionalmente, avaliaram-se os efeitos cl?nicos adversos, sensibilidade dent?ria e sangramento gengival. O estudo dos efeitos adversos ao esmalte dent?rio foi realizado in vivo e in situ, atrav?s da fluoresc?ncia a laser com o uso do DIAGNOdent?, objetivando detectar perdas de mineral. Foram empregadas ainda, a Microscopia Eletr?nica de Varredura (MEV), para verificar altera??es morfol?gicas superficiais, a Espectrometria de Energia Dispersiva (EDS), para avaliar semiquantitativamente a composi??o qu?mica atrav?s do ratio Ca/P, e a t?cnica de Difra??o de Raio-X (DRX) com a finalidade de observar altera??es na microestrutura do esmalte. Os resultados revelaram ser a t?cnica de clareamento caseiro com per?xido de carbamida a 10% efetiva em 96% dos casos, contra 8% do grupo PLA, apresentando 36% (9/25) de sensibilidade dent?ria. N?o houve associa??o significativa entre a presen?a de sangramento gengival e o tipo de gel utilizado (p=1,00). A an?lise da fluoresc?ncia a laser in vivo n?o revelou diferen?a nos valores para o grupo controle, enquanto no grupo OPA houve diferen?a estatisticamente significativa entre os valores da linha base em rela??o aos per?odos subseq?entes (p<0,01), com valores m?dios menores nos tempos p?s-clareamento. Entre os grupos, houve diferen?a significativa nos per?odos T0 e T30. A avalia??o das micrografias n?o revelou altera??es na superf?cie do esmalte que possam ser relacionadas ao tratamento realizado. Nenhuma altera??o significativa na propor??o Ca/P foi observada no grupo OPA (p=0,624) nem no grupo PLA (p=0,462) para cada um dos per?odos de observa??o, nem entre os grupos estudados (p=0,102). O padr?o da DRX para todos os grupos evidenciou a presen?a de tr?s fases relativas ? hidroxiapatita de acordo com os arquivos JCPDS (9-0432[Ca5(PO4)3(OH)], 18- 0303[Ca3(PO4)2.xH2O] e 25-0166[Ca5(PO4)3(OH,Cl,F)]). Nenhum outro pico associado a outras fases foi encontrado, independente do grupo analisado, o que revela n?o ter havido desaparecimento, nuclea??o ou transforma??o de fases. Pode-se constatar ainda que n?o houve altera??o no padr?o dos picos em rela??o ? localiza??o dos mesmos. Atrav?s da metodologia empregada neste estudo, pode-se concluir que o clareamento caseiro supervisionado pelo dentista com per?xido de carbamida a 10%, dentro do protocolo aqui utilizado, se mostrou um procedimento efetivo e seguro para o esmalte dent?rio

Made available in DSpace on 2014-12-17T14:13:27Z (GMT). No. of bitstreams: 1 OtavioJPN.pdf: 2556695 bytes, checksum: 1b00cc54688530c66184271da837d877 (MD5) Previous issue date: 2008-07-31 / The objectives of this clinical study was to evaluate the use of the toothpaste with fluoride and without fluoride and the daily tooth brushing are effective in the reversion of the dental enamel conditioned by acid. Another objective of this clinical study was to evaluate if the positioning of orthodontic accessories with glass ionomer cement helps in the reversion of the dental enamel conditioned by acid, when compared to composed resin. One hundred and twenty teeth were selected with indication of extraction by orthodontic reasons. The 30 volunteers were divided, randomly, in two groups. A group used toothpaste without fluoride and the other with it. The teeth of the sample were shuffled, in each volunteer. The teeth were conditioned by the 37% orthophosphoric acid. One of the conditioned teeth stayed in the mouth and suffered action of the abrasion for the tooth brushing, in another teeth a stainless steel mesh protection was positioned with glass ionomer cement, in another tooth the screen was glued with composed resin, in a fourth tooth (the control) was only conditioned after the extractions, 60 days later. All the teeth were appraised through DIAGNOdent, MEVA and EDS. In the obtained data it was possible to observe that there were not statistic significant differences in any comparison, even in the group that did not have access to the fluoride in the toothpaste as in the other that had. According with the used methodology, it was possible to observe too that there was not statistic significant differences in any comparison, even in the group that had the stainless steel mesh positioned with glass ionomer cement as in the group that the stainless steel mesh was positioned with composed resin. However, it was observed that there was an improvement in the topography of the enamel in all the teeth. The accomplishment of this study was facilitated due to the participation of the researchers' of the health area (dentistry), materials engineer, physics and chemistry. The researchers were originating from the Federal University of Rio Grande do Norte and of the University of Queensland, in Australia. This interdisciplinary group was decisive in the accomplishment of the study. It can be concluded that the enamel tends to return to its initial aspect, even if the patient does not have access to fluoride. That is probably due the action of the abrasion for the tooth brushing and mastication. In spite of it not being significant, it is suggested that the conditioned enamel was more resistant to the abrasion in the group that had access to fluoride. It was also possible to conclude that the fluoride liberated by the glass ionomer was not enough to provide a significant difference in the enamel conditioned by the acid, when compared with the composed resin, even in the group that did not use fluoride in the toothpaste as in the group that used / O objetivo deste estudo foi de avaliar o uso do dentifr?cio com fl?or e sem fl?or e a escova??o di?ria na revers?o do esmalte dent?rio condicionado pelo ?cido. Outro objetivo foi de avaliar se a colagem de acess?rios ortod?nticos com ion?mero de vidro auxilia na revers?o do esmalte dent?rio condicionado pelo ?cido. Foram selecionados 120 dentes com extra??o indicada de 30 volunt?rios que foram divididos, leatoriamente, em dois grupos. Um grupo utilizou dentifr?cio sem fl?or e o outro com fl?or. Os dentes foram condicionados pelo ?cido. Um dos dentes condicionados permaneceu na boca e sofreu a??o da abras?o pela escova??o, noutro foi colada uma tela de prote??o com ion?mero de vidro, noutro a tela foi colada com resina composta, num quarto dente (controle) s? foi condicionado ap?s as extra??es, 60 dias depois. Todos os dentes foram avaliados atrav?s do DIAGNOdent, MEVA e EDS. Nos resultados obtidos foi poss?vel observar que n?o houve diferen?a estatisticamente significativa em nenhuma compara??o, tanto no grupo que n?o teve acesso ao fl?or no dentifr?cio como no que teve. Por?m, foi observado que houve uma melhora na topografia do esmalte em todos os dentes. A realiza??o desse trabalho foi facilitada devido ? participa??o de pesquisadores das ?reas da sa?de (odontologia), engenharia dos materiais, f?sica e qu?mica. Os pesquisadores foram oriundos da Universidade Federal do Rio Grande do Norte e da University of Queensland, na Austr?lia. Essa multidisciplinaridade foi decisiva na realiza??o desse estudo. Com esse estudo pode-se concluir que o esmalte tende a retornar o seu aspecto inicial, mesmo que o paciente n?o tenha acesso ao fl?or. Isso se deve provavelmente a a??o da abras?o pela escova??o e mastiga??o. Tamb?m foi poss?vel concluir que o fl?or liberado pelo ion?mero de vidro da colagem do acess?rio ortod?ntico n?o foi suficiente para proporcionar uma diferen?a significativa no esmalte condicionado pelo ?cido. Tanto no grupo que n?o utilizou fl?or no dentifr?cio como no grupo que usou

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-05T00:11:28Z No. of bitstreams: 1 ItaniellyDantasSilveiraCruz_DISSERT.pdf: 2442849 bytes, checksum: 02e55bdcb8191be6836bcbfa7df46f9c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-16T23:01:44Z (GMT) No. of bitstreams: 1 ItaniellyDantasSilveiraCruz_DISSERT.pdf: 2442849 bytes, checksum: 02e55bdcb8191be6836bcbfa7df46f9c (MD5) / Made available in DSpace on 2017-10-16T23:01:44Z (GMT). No. of bitstreams: 1 ItaniellyDantasSilveiraCruz_DISSERT.pdf: 2442849 bytes, checksum: 02e55bdcb8191be6836bcbfa7df46f9c (MD5) Previous issue date: 2017-07-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Objetivo: Analisar o efeito de diferentes protocolos de fotoativa??o na resist?ncia de uni?o ao cisalhamento (RUC) de br?quetes met?licos colados em esmalte e no grau de convers?o (GC) de uma resina ortod?ntica utilizando tr?s aparelhos fotoativadores. Metodologia: 230 coroas de incisivos bovinos foram distribu?das aleatoriamente em 23 grupos (n=10). Ap?s ser realizado o tratamento de superf?cie com ?cido fosf?rico (15 segundos) e Primer Transbond XT (3M Unitek), br?quetes met?licos foram colados ao esmalte com resina Transbond XT (3M Unitek) utilizando 23 protocolos de fotoativa??o de acordo com os fatores ?aparelho fotoativador? (FlashMax P4 ? RMO, Valo Cordless ? Ultradent ou Radii-Cal ? SDI), ?faces fotoativadas? (centro/vestibular; mesial, distal, cervical e incisal; mesial e distal ou cervical e incisal) e ?tempo de fotoativa??o? (2, 3, 4, 6, 20 ou 40 segundos). O ensaio de cisalhamento (100KgF, 1mm/min) foi realizado ap?s o armazenamento das amostras por 4 meses (?gua destilada, 37?C). Utilizando os mesmos protocolos de fotoativa??o, 230 discos de resina (0,1 mm de espessura e 5 mm de di?metro, em m?dia) foram confeccionados para an?lise do GC. Os dados da RUC (MPa) e do GC (%) foram avaliados descritivamente e atrav?s do teste T de Student, da ANOVA one way e do teste de Tukey. As falhas de uni?o foram classificadas de acordo com o ?ndice Remanescente Adesivo (IRA), analisadas descritivamente e atrav?s do teste de Kruskal-Wallis. Resultados: De todos os 23 protocolos, apenas 5 apresentaram valores de RUC clinicamente aceitos de acordo com a literatura. No que diz respeito aos fatores ?faces fotoativadas? e ?tempo de fotoativa??o?, os protocolos do Valo Cordless foram os ?nicos que apresentaram resultados quanto ? RUC estatisticamente semelhantes (p=0,230 e p=0,093, respectivamente). Das compara??es que apresentaram diferen?a estatisticamente significativa (p?0,05) quanto ao fator ?tempo de fotoativa??o? de acordo com a RUC, 66,6% correspondem aos protocolos onde apenas a face central do br?quete foi fotoativada. Ao comparar os grupos onde apenas duas faces foram fotoativadas, aqueles em que o par de faces correspondeu ? mesial e ? distal foram os que resultaram maiores valores de RUC. Quanto ao GC, tendo em vista o fator ?faces fotoativadas?, apenas os resultados dos grupos do FlashMax P4 foram estatisticamente diferentes (p?0,05). O Valo Cordless foi o ?nico aparelho no qual o fator ?tempo de fotoativa??o? n?o afetou de forma estatisticamente significa os valores do GC (p=0,968). E a maioria (66,6%) dos valores mais elevados do GC quando apenas duas faces foram fotoativadas correspondeu ?queles protocolos nos quais tais faces foram a mesial e a distal. Em rela??o ao IRA, houve diferen?a estatisticamente significativa entre os escores (p=0,000), sendo que o escore 2 foi o mais observado (52,6%). Conclus?o: A RUC dos br?quetes met?licos colados ao esmalte e o GC da Transbond XT podem apresentar diferen?as estatisticamente significativas a depender do aparelho fotoativador selecionado e do protocolo de colagem utilizado pelo ortodontista. E sup?e-se que a for?a adesiva entre a resina e o esmalte dent?rio ? maior do que aquela entre o br?quete e a Transbond XT. / Objective: To analyze the effect of different photoactivation protocols on shear bond strength (SBS) of metallic brackets bonded to enamel and the degree of conversion (DC) of an orthodontic resin using three photoactivating devices. Methodology: 230 crowns of bovine incisors were randomly distributed in 23 groups (n = 10). After the surface treatment with phosphoric acid (15 seconds) and Primer Transbond XT (3M Unitek), metal brackets were bonded to the enamel with Transbond XT resin (3M Unitek) using 23 photoactivation protocols according to the factors "photoactivator" (FlashMax P4 ? RMO, Valo Cordless ? Ultradent or Radii-Cal ? SDI), "photoactivated faces" (center/vestibular; mesial, distal, cervical and incisal; mesial and distal or cervical and incisal) and "photoactivation time" (2, 3, 4, 6, 20 or 40 seconds). The shear test (100KgF, 1mm/min) was performed after storage of the samples for 4 months (distilled water, 37?C). Using the same photoactivation protocols, 230 resin discs (0,1 mm thick and 5 mm diameter, on average) were made for DC analysis. The SBS (MPa) and DC (%) data were evaluated descriptively and through Student's T-test, one-way ANOVA and the Tukey test. The union failures were classified according to the Adhesive Remnant Index (ARI), analyzed descriptively and through the Kruskal-Wallis test. Results: Of all 23 protocols, only 5 presented clinically accepted SBS values according to the literature. Regarding the factors "photoactivated faces" and "photoactivation time", the Valo Cordless protocols were the only ones that presented statistically similar SBS results (p=0,230 and p=0,093, respectively). Of the comparisons that presented a statistically significant difference (p?0,05) regarding the factor "time of photoactivation" according to SBS, 66,6% corresponded to the protocols where only the central face of the bracket was photoactivated. When comparing the groups where only two faces were photoactivated, those in which the pair of faces corresponded to the mesial and the distal were the ones that resulted in higher SBS values. Regarding the CG, considering the "photoactivated faces" factor, only the results of the FlashMax P4 groups were statistically different (p?0,05). The Valo Cordless was the only device in which the factor "time of photoactivation" didn?t affect statistically means the values of the DC (p=0,968). And the majority (66,6%) of the highest DC values when only two faces were photoactivated corresponded to those protocols in which such faces were mesial and distal. Regarding ARI, there was a statistically significant difference between the scores (p=0,000), and the score 2 was the most observed (52,6%). Conclusion: The SBS of the metal brackets bonded to the enamel and the DC of the Transbond XT resin may present statistically significant differences depending on the selected photoactivating device and the bonding protocol used by the orthodontist. And it?s assumed that the adhesive force between the resin and the dental enamel is greater than that between the bracket and the Transbond XT.

Made available in DSpace on 2014-12-17T15:30:57Z (GMT). No. of bitstreams: 1 NeuzaSM_DISSERT.pdf: 1096884 bytes, checksum: 64158d211b184c940877d132acbd6173 (MD5) Previous issue date: 2011-03-14 / Objective: The aim of the present study is to assess the current situation of white enamel lesions on vestibular surfaces of permanent upper incisors, diagnosed 6 years ago, without clinical intervention. Methods: A prospective study reassessed 53 students of both sexes, aged between 13 and 18 years old, all attending the public school system in Natal, Brazil. Data collection was performed by duly calibrated examiners, and a clinical chart consisting of demographic data on dental caries, oral hygiene, and gingival condition was prepared. A tactile-visual examination was conducted using a clinical mirror and periodontal probe. Data compilation and analysis were carried out using a SPSS software. In this analysis the chi-squared test was used for qualitative independent variables. To identify the net effect of treatment, multiple logistic analysis with forward stepwise model selection was performed. Results: The final sample was composed of 106 lesions in the 53 individuals, with mean age of 15.02 years, visible plaque index (VPI) of 23.34%, and gingival blood indices (GBI) of 25.92%. A statistically significant relationship (p = 0.003) was found between initial DMFS and prognosis of white enamel lesion. Conclusions: We observed that past caries experience and dental plaque were the main predictive factors for negative lesion outcomes, demonstrating the need for oral hygiene control through continuing preventive measures / Objetivo: O presente estudo tem como objetivo avaliar a situa??o atual de les?es brancas de c?rie, bem como a influencia dos fatores preditores no progn?stico dessas les?es, diagnosticadas h? 6 anos, sem interven??o cl?nica. M?todos: Um estudo do tipo prospectivo avaliou 53 estudantes da rede p?blica da cidade de Natal/Brasil, entre 13 e 18 anos, de ambos os sexos. A coleta de dados foi realizada por um examinador devidamente calibrado, com o aux?lio de uma ficha cl?nica composta por dados demogr?ficos, como tamb?m de c?rie dent?ria e higiene oral. O exame executado foi do tipo t?til-visual, com a utiliza??o de espelho cl?nico e sonda periodontal, sendo registrado para a c?rie dent?ria ( CPO-S,Nc?rie e CPOCEO) e para a higiene oral (IPV e ISG). A tabula??o e a an?lise dos dados foram realizadas no software SPSS. Nesta an?lise foi utilizado o teste de associa??o Qui-Quadrado para as vari?veis independentes qualitativas. Para a identifica??o do efeito l?quido, foi realizada a an?lise de regress?o log?stica m?ltipla com uma modelagem do tipo stepwise forward. Resultados: A amostra final foi composta por 106 les?es de 53 indiv?duos, com m?dia de idade 15,02 anos, com ?ndices elevados de placa vis?vel (IPV 23,34%) e de sangramento gengival (ISG 25,92%). Foi verificada uma rela??o estatisticamente significativa (p = 0,003) entre as vari?veis CPO-S2 inicial e o progn?stico das les?es brancas. Conclus?o: Foi observado que uma maior experi?ncia passada de c?rie somada a presen?a de biofilme dent?rio s?o os principais fatores preditores para o desfecho negativo das les?es, demonstrando a necessidade de um controle cont?nuo da higiene oral e da aplica??o constante de medidas preventivas para o sucesso cl?nico, que seria a inativa??o das les?es brancas de c?rie

Made available in DSpace on 2014-12-17T14:13:37Z (GMT). No. of bitstreams: 1 CiceroFF.pdf: 3167978 bytes, checksum: d9de3f0c1f071f112b7a1ab53a79b32c (MD5) Previous issue date: 2008-08-14 / The objective of this clinical study was to evaluate the effectiveness of the toothbrushing with and without fluoride and the daily fluoride rinse (NaF 0.05%) on produced white spot, in vivo. This was a clinical study, controlled, randomized and triple blind. Thirty patients were selected for orthodontics reasons from Orthodontics Specialization Course at the Brazilian Dental Association - Section of Rio Grande do Norte. In this study it was used 4 bicuspid upper and lower. They had orthodontic reason for extractions, in 35 days, at least. The sample had one hundred and twenty teeth that received orthodontic bands. The bands were fixed with polycarboxylate cement, and there was a space standardized between bands and one surface of teeth. The four bicuspid of each patients were randomized and nominated as A, B, C and D. These nominations determinated the sequence of the extractions and what was done in each tooth. All the patients had been submitted to the toothbrushing with or without fluoride for 35 days. After this period, the A tooth of each patient was extracted to serve as control. The others teeth (B, C and D) were extracted one by each week. The entire sample was analyzed through the clinical examination and by laser fluorescence (DIAGNOdent?) in three different times: before orthodontic bands, 28 days after fixed and then removed the bands and, the last one, 07 days after one of the three treatments (toothbrushing with or without fluoride, tooth paste with fluoride and mouth rinse with fluoride). At the beginning all groups (A, B, C and D) had the same conditions, no significant difference was found. The same situation was found in a clinical examination. The results of the DIAGNOdent? for the groups that used tooth paste without fluoride, with fluoride and mouth rinse with fluoride, after 28 days, there was no significant difference. Clinically, the white spot was formed in all teeth after 28 days. When it was compared the three treated groups, the group without fluoride in tooth paste had worst result than the others groups. But there was no significant association between the number of active and inactive white spots and the type of treatment that the teeth had received. The demineralization of the enamel surface, under the orthodontic bands, it happened in a few weeks. The exposition of the white spots in oral environmental resulted in an improvement, but it was not enough to return to the values from the base line, either for the toothbrushing and/or the use of fluorite mouth rinse. Mouth rinse and toothpaste with fluoride have showed to reduce the incidence of demineralization in the enamel, but none seems to be superior to another one in an in vivo study / O objetivo desse estudo cl?nico foi avaliar a efetividade da escova??o com e sem dentifr?cio fluoretado e o enxaguat?rio bucal fluoretado na forma de bochecho di?rio (NaF 0,05%) associado a escova??o com dentifr?cio fluoretado sobre as les?es brancas de esmalte produzidas in vivo. Este estudo se constituiu em um ensaio cl?nico controlado e randomizado. Para tanto, foram selecionados 32 pacientes do Curso de Especializa??o em Ortodontia da Associa??o Brasileira de Odontologia Sec??o do Estado do Rio Grande do Norte, que necessitavam como parte do tratamento de exodontias. Os cento e vinte e oito dentes receberam an?is ortod?nticos, cimentados com cimento de policarboxilato, com espa?o padronizado na superf?cie vestibular, S?tio Cariog?nico . Os quatro premolares de cada paciente foram aleatorizados individualmente, em dente A, B, C e D, com a finalidade de se determinar a seq??ncia das exodontias e os tipos de procedimentos a serem realizados para cada dente. Todos os pacientes foram submetidos ? escova??o com dentifr?cio sem fl?or por um per?odo de 35 dias. Ap?s esse per?odo, o dente A de cada paciente foi extra?do para servir como controle. Os demais dentes B, C e D foram extra?dos ap?s uma, duas e tr?s semanas, respectivamente. Os esp?cimes foram analisados atrav?s do exame cl?nico e da fluoresc?ncia a laser (DIAGNOdent?) antes da cimenta??o dos an?is ortod?nticos, 28 dias ap?s o desafio cariog?nico e 07 dias ap?s ter sido submetido a um dos tr?s tratamentos (escova??o com dentifr?cio sem fl?or, dentifr?cio com fl?or e bochecho com enxaguat?rio bucal fluoretado associado a escova??o com dentifr?cio com fl?or) institu?dos nesse estudo. Clinicamente, a les?o branca foi formada em todos os elementos dent?rios analisados ap?s 28 dias do desafio cariog?nico. Observou-se que n?o houve diferen?a estat?sticamente significativa entre as medianas para os valores do DIAGNOdent? e para os valores dos escores relacionados ao exame cl?nico entre os grupos de tratamentos ap?s 07 dias. Quando comparou-se os tr?s grupos tratados, o grupo dentifr?cio sem fl?or apresentou um n?mero de les?es brancas ativas maior que os grupos dentifr?cio com fl?or e bochecho com fl?or, nos quais ocorreu um predom?nio do n?mero de les?es brancas inativas. No entanto, n?o houve associa??o significativa entre o n?mero de les?es brancas ativas e inativas e o tipo de tratamento que os dentes receberam. A desmineraliza??o do esmalte subjacente aos an?is ortod?nticos mal adaptados ? um processo r?pido e ocorre dentro de poucas semanas. A exposi??o das les?es brancas de esmalte, ativas ao meio bucal, resulta em uma r?pida inativa??o das mesmas, mas n?o o suficiente para retornar aos valores da linha base, seja por dist?rbios mec?nicos da escova??o e/ou a utiliza??o de enxaguat?rio bucal fluoretado associado ao dentifr?cio fluoretado. Os dentifr?cios a base de fl?or e os enxaguat?rios bucais fluoretados t?m mostrado reduzir a incid?ncia de desmineraliza??o do esmalte, mas nenhum parece ser superior ao outro tomando como base o modelo de c?rie in vivo