Ex vivo analysis of the debris remaining in flattened root canals of vital and nonvital teeth after biomechanical preparation with Ni-Ti rotary instruments



Document title: Ex vivo analysis of the debris remaining in flattened root canals of vital and nonvital teeth after biomechanical preparation with Ni-Ti rotary instruments
Journal: Brazilian dental journal
Database: PERIÓDICA
System number: 000290337
ISSN: 0103-6440
Authors: 1




Institutions: 1Universidade de Ribeirao Preto, Escuela de Odontología, Ribeirao Preto, Sao Paulo. Brasil
Year:
Volumen: 17
Number: 3
Pages: 233-236
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, analítico
English abstract The purpose of this study was to assess the presence of apical debris remaining in the apical third of flattened root canals of vital and nonvital teeth after biomechanical preparation with Ni-Ti rotary instruments. Fresh-extracted human mandibular incisors were used in this study. The teeth had clinical indication for extraction and were submitted to cold pulp vitality testing and radiographic examination. Eighteen teeth were selected and randomly assigned to two groups (n=9), according to the clinical diagnosis, i.e., pulp vitality or pulp necrosis. The canals were instrumented with the ProTaper NiTi rotary system in the following sequence: S1 - up to the middle third; SX - at the cervical third; S2- up to the apical third; and S1, F1, F2, F3 - at the working length. The canals were irrigated with 1% sodium hypochlorite, dried and were submitted to the histological processing. Sections from the apical third were analyzed by an optical microscope (X40) that was coupled to a computer where the images were captured and analyzed using specific softwares. A grid was placed over these images to assess the total canal area and the areas with debris. Mann-Whitney U-test showed no statistically significant difference (p>0.05) between the teeth with pulp vitality (6.49 ± 3.39) and those with pulp necrosis (5.95 ± 2.22). It may be concluded that the clinical condition of pulp tissue did not interfere with the amount of debris remaining in the apical third of flattened root canals prepared with Ni-Ti rotary instruments
Portuguese abstract O objetivo deste estudo foi avaliar a presença de debris no terço apical de canais radiculares achatados de dentes com polpa vital ou não-vital após preparo biomecânico com instrumentos rotatórios de níquel-titânio. Incisivos humanos inferiores recentemente extraídos for usados neste estudo. Os dentes tinham indicação para exodontia e o diagnóstico clínico do estado pulpar foi realizado mediante teste de vitalidade com frio e exame radiográfico. Dezoito incisivos inferiores humanos foram selecionados e distribuídos em dois grupos (n=9), de acordo com o diagnóstico clínico: dentes com a polpa viva ou dentes com a polpa necrosada. Os canais radiculares foram instrumentados com o sistema rotatório ProTaper com instrumentos de NiTi na seguinte seqüência: S1- até o terço médio; SX - no terço cervical; S2 - até no terço apical; e S1, F1, F2, F3 - no comprimento de trabalho. Os canais foram irrigados com hipoclorito de sódio a 1%, secos e submetidos ao processamento histológico. Cortes do terço apical foram analisados em microscópio ótico (40X) acoplado a um computador onde as imagens resultantes foram capturadas e analisadas utilizando programas específicos. Uma grade foi colocada sobre estas imagens para avaliar a área total do canal e as áreas com debris. O teste de Mann-Whitney mostrou não haver diferença estatisticamente significante (p>0,05) entre os dentes com vitalidade pulpar (6,49 ± 3,39) e aqueles com necrose pulpar (5,95 ± 2,22). Concluiu-se que o estado clínico pulpar não interferiu na quantidade de debris remanescentes no terço apical de canais radiculares achatados preparados com instrumentos rotatórios de NiTi
Disciplines: Medicina
Keyword: Medicina experimental,
Odontología,
Instrumentos rotatorios,
Raiz dental,
Pulpa dental,
Detritos,
Limpieza
Keyword: Medicine,
Dentistry,
Experimental medicine,
Rotary instruments,
Dental root,
Dental pulp,
Debris,
Cleaning
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