Emprego da microtomografia computadorizada na análise de preparo, limpeza e obturação de canais radiculares ovalados

• Ano de defesa: 2018
• Autor(a) principal: Passador, Camila Galletti Espir [UNESP]
• Orientador(a): Tanomaru Filho, Mário [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Endodontia; Obturação do canal radicular; Preparo de canal radicular
• Palavras-chave em Inglês: Endodontics; Root canal obturation; Root canal preparation
• Link de acesso: http://hdl.handle.net/11449/152837

This study evaluated the morphology, preparation and filling using different techniques and materials in oval-shaped canals. Five hundred and twenty mandibular incisors were evaluated using digital radiography in the buccolingual (BL) and mesio distal (MD) directions, being obtained from the VL / MD diameter ratio: 23.3% flattened canals; 41.3% ovals; 27.3% rounded; 4.5% round e 3.6% with flattening BL (Publication 1). The oval-shaped incisors were prepared: Reciproc 40 (R40) counterclockwise reciprocating; MTwo 40, taper .06 (M 40.06) clockwise reciprocating (150° clockwise and 30° counterclockwise); and MTwo 20, taper .06 and MTwo 40, taper .06 (M 20/40.06) clockwise reciprocating (Publication 2); R40, Unicone 20.06 and 40.06 reciprocanting (Uni20/40.06) and Mtwo rotary system until 40.06 (Mtwo seq) (Publication 3); and R40, M40.06 e Mtwo seq (Publication 4). Filling was performed using single-cone technique (SC) or lateral condensation (LC) and AH Plus sealer (AHP) (Publication 4); SC and AHP or Neo MTA Plus (NMTAP) sealer (Publication 5); and LC using MTA Fillapex (MTAF) or AHP sealer (Publication 6). Scans were performed before and after each experimental stage, using the SkyScan 1176 micro-computed tomography. Volume, percentage of debris, percentage of uninstrumented surface and voids in obturation were obtained. Data were submetted to ANOVA and Tukey’s tests or Kruskal–Wallis and Dunn tests, non-paired T test or Mann-Whitney (α=0.05). Reciproc and Mtwo using different kinematics were associated with a similar increase in root canal volume. M20/40.06 was associated with significantly lower debris in the middle third. The reciprocation motion for R40 and the clockwise reciprocation motion for Mtwo resulted in similar root canal preparations. Less remaining debris was present in the middle third when two instruments with diferente diameters were used (Publication 2). Unicone preparation was associated with higher debris, increase in root canal volume and uninstrumented surface in entire root canal and in the middle third. Better cleaning and less remaining debris was observed when R40 and Mtwo seq were used (Publication 3). MTwo seq was associated with higher debris and uninstrumented surface in the cervical third, and higher percentage of failure for the SC in the entire root canal and in cervical and apical thirds after this prepare. R40 and M40.06 were associated with less remaining debris and a similarity between SC and LC (Publication 4). No significant differences were observed in the different thirds for AHP or NMTAP sealer. NMTAP sealer presents the ability to fill oval canals by SC similar to AHP (Publication 5). Filling using MTAF showed higher percentual of voids in cervical third, with no difference in the other thirds. The volumetric change analysis revealed higher volumetric loss to MTAF. MTAF provides a greater percentage of voids in the filling of oval canals, and presents greater volumetric loss than the AHP. (Publication 6).