Made available in DSpace on 2014-07-29T15:22:00Z (GMT). No. of bitstreams: 1 dissertacao henrique c m oliveira.pdf: 1002486 bytes, checksum: eddcaf3f31b0f29703a16146f9f05b7d (MD5) Previous issue date: 2010-02-26 / The aim of this study was to determine the errors of procedures that occurred during the preparation of curved root canals after the use of instruments níqueltitânio powered motor managed by specialists in endodontics and dental students. Forty upper and lower molars of humans were randomly divided into two groups of 20, according to traders: G1A-(Molars, specialists in endodontics), G1B-(lower molars, specialists in endodontics), G2A-(molars, dental students), G2B-(lower molars, dental students). The ProTaper Universal System was used to prepare all root canals. The AH PlusTM associated with gutta-percha was used with lateral condensation technique for obturation of all canals. Periapical radiography and cone beam computed tomography (TCFC) were obtained to verify procedural errors occurred during the preparation of root canals. Two examiners evaluated all images for determining the presence or absence of instrument fracture, root perforation (cervical, middle or apical) and deviation original path of the root canal (apical transport). The data were statistically analyzed employing the Chi-square test. The significance level was 5%. The rate of fractured instruments showed no significant differences in the level of experience of operators (p = 1.000). Root perforations and transport apical occurred more frequently in the group of students, without significant differences. While there have been some procedural errors during root canal preparation with experienced and inexperienced operators, the results suggest that the introduction of tools of nickel-titanium engine-driven education / O objetivo deste estudo foi determinar os erros de procedimentos ocorridos durante o preparo de canais radiculares curvos após o uso de instrumentos de níqueltitânio acionados a motor manejados por especialistas em endodontia e estudantes de odontologia. Quarenta molares superiores e inferiores de humanos foram aleatoriamente divididos em dois grupos de 20, de acordo com os operadores: G1A- (molares superiores, especialistas em endodontia), G1B- (molares inferiores, especialistas em endodontia); G2A- (molares superiores, estudantes de odontologia), G2B- (molares inferiores, estudantes de odontologia). O sistema ProTaper Universal foi usado para o preparo de todos os canais radiculares. O cimento AH PlusTM associado com a guta-percha foi usado com a técnica da condensação lateral para a obturação de todos os canais radiculares. Radiografias periapicais e tomografia computadorizada de feixe cônico (TCFC) foram obtidas para verificar erros de procedimentos ocorridos durante o preparo dos canais radiculares. Dois examinadores avaliaram todas as imagens determinando a presença ou ausência de fratura de instrumentos, perfurações radiculares (terço cervical, médio ou apical) e desvio do trajeto original do canal radicular (transporte apical). Os dados foram estatisticamente avaliados empregando-se o teste Qui-quadrado. O nível de significância foi de 5%. A taxa de instrumentos fraturados não mostrou diferenças significantes em relação ao nível de experiência dos operadores (p=1,000). Perfurações radiculares e transportes apicais ocorreram mais frequentemente no grupo dos estudantes, sem diferenças significantes. Embora tenham sido observados alguns erros de procedimentos durante o preparo do canal radicular com operadores experientes e inexperientes, os resultados sugerem que a introdução de instrumentos de níquel-titânio movidos a motor no ensino da graduação parece promissora. Ambos os métodos de imagens permitiram identificar erros operatórios, porém a tomografia computadorizada de feixe cônico apresenta elevado potencial de auxiliar a terapia endodôntica.

Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-05-10T11:30:57Z No. of bitstreams: 2 Dissertação - Vinicius Caixeta de Sousa - 2016.pdf: 6443318 bytes, checksum: 09bb12a456ef519b05b09ed648a75811 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-05-10T11:31:28Z (GMT) No. of bitstreams: 2 Dissertação - Vinicius Caixeta de Sousa - 2016.pdf: 6443318 bytes, checksum: 09bb12a456ef519b05b09ed648a75811 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-05-10T11:31:28Z (GMT). No. of bitstreams: 2 Dissertação - Vinicius Caixeta de Sousa - 2016.pdf: 6443318 bytes, checksum: 09bb12a456ef519b05b09ed648a75811 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2016-04-19 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Abstract: Objective: To evaluate the effectiveness of complementary protocols of sanitization in the decontamination of infected root canals. Methods: Fifty uniradicular maxilary anterior human teeth were selected. The crowns were removed and the lengths standardized at 16 mm. The specimens were inoculated with Enterococcus faecalis and incubated at 37 °C for sixty days. Thirty teeth were performed with BioRace instruments until diameter corresponding to #60.02, and then complemented with Self-Adjusting File (SAF); XP-endo Finisher (XPF) and passive ultrasonic irrigation (PUI). Ten samples were used as positive control and 10 were not contaminated. Initial and final samples were collected and incubated at 37 °C for a period of 48 hours. The bacterial growth was analyzed in culture, determining the presence or absence of bacteria. The optical density of the culture medium was interpreted by UV spectrophotometry. The specimens were sectioned and prepared for evaluation in SEM. The images of the root surfaces were analyzed and classified by scores according to the presence of debris. The Kruskal-Wallis test was used for statistical analysis. The level of significance was 5%. Results: The mean optical density (μm) of the sanification protocols showed bacterial reduction in all groups. The experimental groups did not present statistically significant differences (p = 0.196). The analysis of SEM images revealed no significant difference (p = 0.414) between the scores of the groups. Conclusion: Complementary sanitization protocols reduced bacterial contamination. / Resumo: Objetivo: Avaliar a efetividade de protocolos complementares de sanificação na descontaminação de canais radiculares infectados. Materiais e métodos: Cinquenta dentes humanos anteriores superiores unirradiculares foram selecionados. As coroas foram removidas e os comprimentos padronizados em 16 mm. Os espécimes foram inoculados com Enterococcus faecalis e incubados a 37°C por sessenta dias. Trinta dentes foram preparados com instrumentos BioRace até alcançar o diâmetro correspondente ao #60.02, e a seguir complementados com Self-Adjusting File (SAF); XP-endo Finisher (XPF) e irrigação ultrassônica passiva (PUI). Dez amostras foram usadas como controle positivo e 10 não foram contaminadas. Amostras inicial e final foram coletadas e incubadas a 37°C por um período de 48 horas. O crescimento bacteriano foi analisado em cultura, determinando a presença ou ausência de bactérias. A densidade óptica do meio de cultura foi interpretada por espectrofotometria UV. Os espécimes foram seccionados e preparados para avaliação em MEV. A análise das imagens das superfícies radiculares foram analisadas e classificadas em scores de acordo com a presença de debris. O teste de Kruskal-Wallis foi utilizado para as análises estatísticas. O nível de significância foi 5%. Resultados: A média da densidade óptica (μm) dos protocolos de sanificação revelou redução bacteriana em todos os grupos. Os grupos experimentais não apresentaram diferenças estatisticamente significante (p=0,196). A análise das imagens de MEV revelou ausência de diferença significante (p=0,414) entre os scores dos grupos. Conclusão: Os protocolos complementares de sanificação favoreceu a redução da contaminação bacteriana.

Indiana University-Purdue University Indianapolis (IUPUI) / Introduction: During root canal treatment (RCT), an opening is made through the crown of the tooth to access and to disinfect the root canal system (RCS). Traditional endodontic access (TEA) may sacrifice tooth structure and weaken the tooth. Cone beam computed tomography (CBCT) provides information about the exact location of the root canals. This information can be used for the design of a canal-directed endodontic access (CDEA). It may also be used for the 3D printing of an acrylic endodontic stent that could help to create a conservative CDEA. Objective: 1) Evaluate the ability of the Dolphin 3D imaging software to assist in creating a CDEA; 2) Compare tooth structure loss in a CDEA to that in a TEA by measuring the volume of remaining tooth structure, surface area of the access opening at the occlusal, and remaining dentin thickness at the CEJ. Materials and Methods: Thirty extracted human mandibular premolars were used. Teeth with large, wide canals were excluded. CBCT images will be taken for all teeth using Kodak 9000. Fifteen teeth were randomly assigned to the TEA group and 15 teeth were assigned to the CDEA group. The CDEA path was mapped using Dolphin 3D imaging software. Acrylic access stents were designed using Rhino 3D software and printed using a 3D printer. The teeth were accessed through the corresponding stents. The 15 teeth that are part of the traditional access group were accessed without a stent. A CBCT scan was taken post-access for all 30 teeth. Wilcoxon Rank Sum Tests were performed to compare the following outcomes for the two groups: the volume of remaining tooth structure, the surface area of the access opening at the occlusal, and remaining dentin thickness at the CEJ. Results: The remaining dentin thickness (percent loss) was not significantly larger for TEA than for CDEA. The surface area (post-treatment) was significantly larger for TEA than for CDEA, and volume (percent loss) was significantly larger for TEA than for CDEA. Conclusion: The use of the CBCT and Dolphin 3D imaging provided an accurate and more conservative CDEA with the guide of an acrylic stent.