Avaliação in vitro da resistência estrutural em dentes fragilizados utilizando reforços intra-radiculares

• Autor(a) principal: Carvalho, Cláudio Antonio Talge [UNESP]
• Data de Publicação: 2002
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/114073
• topic: Endodontia; Traumatismo; Odontologia - Aspectos estéticos; Materiais dentários; Dental Materials

lmmature teeth when suffer trauma with consequent necrosis pulpar they stay with its dentinal walls thin and brittle, becoming more susceptible to the second injuries. The purpose of this work is to evaluate through the compression test, the resistance to fracture of teeth bovine brittleness that received reinforcements within the root canal with composite resin or pins of zircônia fiber. lt was used 56 bovine teeth, which had its crowns sectioned in the medium third standardizing the size of the specimens in 30mm of length. The teeth were divided in four experimental groups (14 teeth) and, except for the group 04 (negative control), all the root canal was instrumented to #80 and enlarged firstly with drills Gates-Glidden numbers 3, 4, 5 and 6 to 20mm of depth, after, lhe coronary portion was enlarged with the conical drill number 721 until the cementoenamel junction facial and, with lhe conical drill number 716, the brittleness of the dentinal walls of the root canal at 20mm of depth, leaving 2mm of thickness approximately in each wall. After, the specimens of the group 01 received reinforcement within the root canal with composite resin, that was cured by aid of the Luminex system and, after, they were obturated; in lhe group 02, the specimens were obturated. Just leaving the 10mm apical with material, and they received reinforcement within the root canal with zircônia fiber pins cemented with resinous cement; the group 03 (positive control) it didn't received reinforcement within the root canal and it was obturated by the technique of the active lateral condensation; in the group 04 (negative control), the teeth were not brittleness. After, all the specimens were embedded with acrylic resin chemically activated, in metallic blocks, which were adapted to a cylindrical device, so that the specimens were fractured by load in angle of 45°. This device was adapted to a lnstron machine, ...