Indiana University-Purdue University Indianapolis (IUPUI) / Objectives: To investigate the effect of bulk-fill resin based composite materials on cuspal deflection in large slot mesio-occlusal-distal cavities (MOD) in premolar teeth. Methodology: Thirty-two sound maxillary premolar teeth with large slot MOD cavities were distributed to four groups (n=8). Three groups were restored with bulk-fill resin composite materials (Tetric EvoCeram, x-tra fil, and Sonic Fill, respectively) in a single increment. The conventional composite group, Filtek Z100, was used to restore the cavities in 2mm increments. Cusp deflection was recorded post irradiation using a Nikon measurescope UM-2 (Nikon, Tokyo, Japan), by measuring the changes in the bucco-palatal width of the premolar teeth at 5 minutes, 24 hours, and 48 hours after completion of the restoration. The cuspal deflection was obtained by recording the difference between the baseline measurements and the other measurements for each tooth. Results: Cuspal deflection was significantly higher in Conventional Composite than in Tetric EvoCeram Bulk Fill (p=0.0031), x-tra Fil Bulk (p=0.0029), and SonicFill Bulk (p=0.0002). There was no significant difference in cuspal deflection for Tetric EvoCeram Bulk, X-tra Fil Bulk, and SonicFill Bulk Composites. Conclusions: All the investigated bulk-fill resin composites exhibited cuspal deflection lower than conventional resin composite. One of the aims of research and studies on the resin composite materials is improving their clinical longevity, and simplifying their use. For that purpose bulk-fill materials are considered promising materials and further clinical studies should be conducted.

Made available in DSpace on 2014-06-11T19:28:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-06-28Bitstream added on 2014-06-13T18:58:14Z : No. of bitstreams: 1 zamboni_sroc_me_sjc.pdf: 452937 bytes, checksum: aa577fb7b57c4fd9cdf2545d1a48a89a (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / A proposta deste trabalho foi avaliar a deformação cuspídea após aplicação de uma carga oclusal em dentes com restaurações diretas e indiretas tipo inlays em 60 pré-molares hígidos divididos em seis grupos: Grupo 1-dentes hígidos; Grupo 2-dentes preparados; Grupo 3-dentes restaurados com resina composta direta filtek. Z350 (3M ESPE); Grupo 4-dentes restaurados com resina composta indireta Sinfony (3M ESPE); Grupo 5- dentes restaurados com inlays de cerâmica injetada IPS Empress 2 (Ivoclar) e Grupo 6-dentes restaurados com inlays produzidos pelo sistema CAD/CAM (CEREC 2). Todas as restaurações indiretas foram cimentadas com cimento resinoso adesivo RelyX ARC(3M ESPE). Os pre-molares receberam medidores de tensão (strain-gauge 060BG.Excel Sensores Brasil) colados nas superfícies vestibular e lingual que possibilitou a mensuração da deflexão das cúspides força aplicada de 100N na face oclusal dos dentes. Foram feitas medições em 'müstrain antes e apos a ciclagem mecânica com freqüência de 1Hz. Foram realizados testes ANOVA para medidas repetidas e Tukey para analisar o efeito do tratamento antes e apos a ciclagem mecânica. O teste de Dunnett foi usado para comparar cada tratamento com o controle. Os resultados antes da ciclagem foram em 'mü'strain: Grupo 1- 577,02'mais ou menos'2,70; Grupo 2- 583,37'mais ou menos'2,76; Grupo 3- 579,16'mais ou menos'3,92; Grupo 4- 578,12'mais ou menos'1,38; Grupo 5- 578,68'mais ou menos'1,57 e Grupo 6- 577,53'mais ou menos'1,93 e apos Grupo 1- 577,02'mais ou meno2,70; Grupo 2- 584,38'mais ou menos'0,827; Grupo 3- 579,24'mais ou menos'0,976 Grupo 4- 578,24'mais ou menos'1,05; Grupo 5- 578,74'mais ou menos'0,788 e Grupo 6- 580,54'mais ou menos'0,99. Após analise dos dados concluiu-se que os dentes que receberam preparo cavitário tiveram aumentada significantemente a deflexão de cúspide;... / The aim of this study was to evaluate the cuspal deflection after application of a oclusal load in teeth with direct and indirect inlays restorations in sixty intact premolars divided in six groups: Group 1 - intacts teeth; Group 2 - prepared teeth; Group 3 - teeth restored with direct composed resin filtek. Z350 (3M ESPE); Group 4 - teeth restored with composed resin indirect Sinfony (3M ESPE); Group 5 - teeth restored with inlays of injected ceramics IPS Empress 2 (Ivoclar) and Group 6 - teeth restored with inlays produced by system CAD CAM (CEREC 2). All the indirect restorations had been cemented with resinous cement adhesive RelyX ARC (3M ESPE). Premolars received measurers from tension (`strain-gauge' Modelo 060BG - Excel Sensory - Brazil) glue in the buccal and lingual surfaces that the measurement of the cuspal deflection made possible caused by a force applied of 100N in the oclusal face of teeth. Measurements in 'müstrain had been made before and after the mechanical loading procedures frequently of 1Hz. Analysis of Variance (ANOVA) for repeated measures and test of Tukey was carried before and after the mechanical loading procedures. Dunnett test was used to compare each treatment with the control Group. The results before the mechanical loading procedures in 'mü'strain had been: Group1- 577,02'mais ou menos'2,70; Group2 - 583,37'mais ou menos'2,76; Group3 - 579,16'mais ou menos'3,92; Group4 - 578,12'mais ou menos'1,38; Group5 - 578,68'mais ou menos'1,57 and Group6 - 577,53'mais ou menos'1,93 and the results had after been: Group1- 577,02'mais ou menos'2,70; Group2- 584,38'mais ou menos'0,827; Group3 - 579,24 'mais ou menos'0,976; Group4 - 578,24'mais ou menos'1,05; Group 5- 578,74'mais ou menos'0,788 and Group6 - 580,54'mais ou menos'0,99. After analysis of the data concluded that the teeth that had received preparation cavitario MOD had increased the cuspal deflection...(Complete abstract, click electronic access below)

Orientador: Lafayette Nogueira Junior / Banca: Lourenço Correr Sobrinho / Banca: Fernando Eidi Takahashi / Resumo: A proposta deste trabalho foi avaliar a deformação cuspídea após aplicação de uma carga oclusal em dentes com restaurações diretas e indiretas tipo inlays em 60 pré-molares hígidos divididos em seis grupos: Grupo 1-dentes hígidos; Grupo 2-dentes preparados; Grupo 3-dentes restaurados com resina composta direta filtek. Z350 (3M ESPE); Grupo 4-dentes restaurados com resina composta indireta Sinfony (3M ESPE); Grupo 5- dentes restaurados com inlays de cerâmica injetada IPS Empress 2 (Ivoclar) e Grupo 6-dentes restaurados com inlays produzidos pelo sistema CAD/CAM (CEREC 2). Todas as restaurações indiretas foram cimentadas com cimento resinoso adesivo RelyX ARC(3M ESPE). Os pre-molares receberam medidores de tensão (strain-gauge 060BG.Excel Sensores Brasil) colados nas superfícies vestibular e lingual que possibilitou a mensuração da deflexão das cúspides força aplicada de 100N na face oclusal dos dentes. Foram feitas medições em 'mü"strain antes e apos a ciclagem mecânica com freqüência de 1Hz. Foram realizados testes ANOVA para medidas repetidas e Tukey para analisar o efeito do tratamento antes e apos a ciclagem mecânica. O teste de Dunnett foi usado para comparar cada tratamento com o controle. Os resultados antes da ciclagem foram em 'mü'strain: Grupo 1- 577,02'mais ou menos'2,70; Grupo 2- 583,37'mais ou menos'2,76; Grupo 3- 579,16'mais ou menos'3,92; Grupo 4- 578,12'mais ou menos'1,38; Grupo 5- 578,68'mais ou menos'1,57 e Grupo 6- 577,53'mais ou menos'1,93 e apos Grupo 1- 577,02'mais ou meno2,70; Grupo 2- 584,38'mais ou menos'0,827; Grupo 3- 579,24'mais ou menos'0,976 Grupo 4- 578,24'mais ou menos'1,05; Grupo 5- 578,74'mais ou menos'0,788 e Grupo 6- 580,54'mais ou menos'0,99. Após analise dos dados concluiu-se que os dentes que receberam preparo cavitário tiveram aumentada significantemente a deflexão de cúspide;...(Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The aim of this study was to evaluate the cuspal deflection after application of a oclusal load in teeth with direct and indirect inlays restorations in sixty intact premolars divided in six groups: Group 1 - intacts teeth; Group 2 - prepared teeth; Group 3 - teeth restored with direct composed resin filtek. Z350 (3M ESPE); Group 4 - teeth restored with composed resin indirect Sinfony (3M ESPE); Group 5 - teeth restored with inlays of injected ceramics IPS Empress 2 (Ivoclar) and Group 6 - teeth restored with inlays produced by system CAD CAM (CEREC 2). All the indirect restorations had been cemented with resinous cement adhesive RelyX ARC (3M ESPE). Premolars received measurers from tension ('strain-gauge' Modelo 060BG - Excel Sensory - Brazil) glue in the buccal and lingual surfaces that the measurement of the cuspal deflection made possible caused by a force applied of 100N in the oclusal face of teeth. Measurements in 'müstrain had been made before and after the mechanical loading procedures frequently of 1Hz. Analysis of Variance (ANOVA) for repeated measures and test of Tukey was carried before and after the mechanical loading procedures. Dunnett test was used to compare each treatment with the control Group. The results before the mechanical loading procedures in 'mü'strain had been: Group1- 577,02'mais ou menos'2,70; Group2 - 583,37'mais ou menos'2,76; Group3 - 579,16'mais ou menos'3,92; Group4 - 578,12'mais ou menos'1,38; Group5 - 578,68'mais ou menos'1,57 and Group6 - 577,53'mais ou menos'1,93 and the results had after been: Group1- 577,02'mais ou menos'2,70; Group2- 584,38'mais ou menos'0,827; Group3 - 579,24 'mais ou menos'0,976; Group4 - 578,24'mais ou menos'1,05; Group 5- 578,74'mais ou menos'0,788 and Group6 - 580,54'mais ou menos'0,99. After analysis of the data concluded that the teeth that had received preparation cavitario MOD had increased the cuspal deflection...(Complete abstract, click electronic access below) / Mestre

No / Dental Enamel Hypoplasia has long been used as a common nonspecific stress indicator in teeth from archaeological samples. Most researchers report relatively minor linear and pitted hypoplastic defects on tooth crown surfaces. In this work we report a high prevalence and early age of onset of extensive enamel defects in deciduous and permanent molars in the subadults from the post-medieval cemetery of Broadgate, east central London. Analysis of the dentition of all 45 subadults from the cemetery, using both macroscopic and microscopic methods, reveals disturbed cusp patterns and pitted, abnormal and arrested enamel formation. Forty-one individuals from this group (93.2%) showed some evidence of enamel hypoplasia, 28 of them showing moderate or extensive lesions of molars, deciduous or permanent (63.6% of the sample). Scanning Electron Microscope images reveal many molars with grossly deformed cuspal architecture, multiple extra cusps and large areas of exposed Tomes' process pits, where the ameloblasts have abruptly ceased matrix production, well before normal completion. This indented, rough and poorly mineralized surface facilitates both bacterial adhesion and tooth wear, and when such teeth erupt fully into the mouth they are likely to wear and decay rapidly. We suggest that this complex combination of pitted and plane-form lesions, combined with disruption of cusp pattern and the formation of multiple small cusps, should henceforth be identified as Cuspal Enamel Hypoplasia.