Made available in DSpace on 2015-04-14T13:30:32Z (GMT). No. of bitstreams: 1
458210.pdf: 1144060 bytes, checksum: 47ded64d10f4581406f15e3b1488e6d1 (MD5)
Previous issue date: 2014-02-27 / Introduction: The aim of the present study was to evaluate the apical enlargement areas of three-rooted human upper premolars by means of micro-computed tomography-(μCT).
M?todos: After the cavity access, canal exploration and odontometry, eighteen samples were divided into three groups according to the preparation technique: manual group (Hand) (n=6) teeth were instrumented by crown-down technique and stainless steel files; ProTaper group (GPt) (n=6) teeth were instrumented by using the Rotary movement and ProTaper system; and WaveOne group (GWO) (n=6) teeth were instrumented by WaveOne instrument operated in reciprocating movement. The final canal enlargement at mesiobuccal (MB), distobucal (DB) and palatal (P) roots match 0,25 mm, 0,25 mm and 0,40 mm, respectively. Micro-computed tomography-(μCT) was performed before and after preparation. The pre and post images corresponding to 0, 2, 4 and 6 mm from the apical stop were overlaid and the difference between the areas of surgical and anatomical canals were measured with the aid of PhotoShop program. The groups were statistically compared using two-way Analysis of Variance (ANOVA) and Tukey post-hoc test at 5% significance level.
Results: There was no difference between the preparation techniques. Regardless of the technique, we found further enlargement toward the cervical portion of the canal. Some canals had excessive enlargement, but no perforation. Moreover, untouched areas were observed in some roots.
Conclusion: There were no differences in all roots when comparing hand, rotary and reciprocating techniques. All of them are safe for the instrumentation of the apical third of three-rooted premolars. / Introdu??o: Este estudo avaliou, in vitro, atrav?s da microtomografia computadorizada (μTC), as ?reas de desgaste em canais radiculares de pr?-molares superiores com tr?s ra?zes, causadas por tr?s diferentes sistemas de preparo. M?todos: Ap?s a abertura coron?ria, esvaziamento dos canais e estabelecimento da odontometria a 1,5 mm do v?rtice radiogr?fico, dezoito esp?cimes foram divididos em tr?s grupos, de acordo com a t?cnica de preparo empregada para o preparo do canal radicular: Grupo manual (Hand) (n=6) - os dentes foram preparados manualmente pela t?cnica coroa-?pice, com limas de a?o-inoxid?vel flex?veis; Grupo ProTaper (GPt) (n=6) dentes preparados pelo sistema rotat?rio ProTaper e Grupo WaveOne (GWO) (n=6) - dentes preparados pelo sistema reciprocante WaveOne. Os alargamentos apicais finais nos canais m?sio-vestibular (MV), disto-vestibular (DV) e palatino (P) corresponderam a 0,25 mm, 0,25 mm e 0,40 mm, respectivamente. Os dentes foram microtomografados antes e ap?s o preparo dos canais. As imagens pr? e p?s-operat?rias, correspondentes a 0, 2, 4, 6 mm do batente apical, foram sobrepostas e a diferen?a entre as ?reas dos canais cir?rgico e anat?mico foram mensuradas, com o aux?lio do programa PhotoShop. Os grupos foram comparados estatisticamente, empregando-se Anova de Dois Crit?rios e Post-hoc de Tukey (P<0,05). Resultados: N?o houve diferen?a entre as t?cnicas de preparo (P<0,05). Independente da t?cnica empregada, percebeu-se um maior alargamento em dire??o a por??o mais cervical do canal. Alguns canais apresentaram alargamento excessivo por?m, n?o houve perfura??o. Por outro lado, em algumas ra?zes observou-se ?reas n?o tocadas. Conclus?o: N?o houve diferen?a entre as t?cnicas manual, rotat?ria e reciprocante, empregadas para o preparo apical de pr?-molares com tr?s ra?zes. Todas s?o seguras para o preparo do ter?o apical desses dentes.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1247 |
| Date | 27 February 2014 |
| Creators | Giannastasio, Daiana Flores Gon?alves |
| Contributors | Pelisser, Fabiana Vieira Vier |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, BR, Faculdade de Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 600, 4673435736271820140 |
Page generated in 0.0031 seconds