bacterial leakage and root fractures are the most important reasons of root canal treatment failure. due to the lack of adhesion of gutta percha to the canal walls, resilon has been introduced as a root-filling material able to bond to the root walls. metal posts may predispose the tooth walls to oblique and vertical fracture which usually leads to tooth loss; whereas, fiber posts may reinforce...

statement of the problem: vertical root fractures are catastrophic events that often result in tooth extraction. many contributing factor are associated with increasing incidence of vertical root fracture. root canal preparation is one of the predisposing factors which can increase the root susceptibility to vertical fracture. purpose: the aim of this study was to compare the effects of three d...

introduction: vertical root fracture inevitably leads to tooth extraction. thus, root filling with obturating materials and sealers that can reinforce the tooth would be an ideal way to reduce fracture in root treated teeth. this study aimed to assess the fracture resistance of roots following the application of different sealers including epiphany, iroot sealer and ah-plus. methods and materia...

background and aims. it is important to evaluate the effects of endodontic materials on tooth structures to avoid endodontic treatment failure. the aim of the present study was to investigate the effect of mineral trioxide aggregates (mta) and portland cement (pc) on fracture resistance of dentin. materials and methods. thirty-six freshly extracted human single-rooted premolar teeth were select...

Background:One of the main reasons for extraction of endodontically treated teeth is vertical root fracture (VRF). Some factors such as root canal treatment are involved in vertical root fracture because of their potential to weaken the tooth structure. Therefore, this study aimed to investigate the effect of combining different obturation materials and rotary systems on the fr...

introduction : dentin removal during root canal instrumentation creates a weaker root structure and increases its potential to fracture. the aim of this in vitro experimental study was to compare fracture resistance of teeth filled with gutta-percha, and resilon using two different techniques. materials and methods: this study was performed on 105 single-canal extracted maxillary incisors. samp...

OBJECTIVE This study evaluated, in vitro, the fracture resistance of human non-vital teeth restored with different reconstruction protocols. MATERIAL AND METHODS Forty human anterior roots of similar shape and dimensions were assigned to four groups (n=10), according to the root reconstruction protocol: Group I (control): non-weakened roots with glass fiber post; Group II: roots with composit...

Introduction: Since preserving the structure of treated teeth is a critical success factor, studying the effects of tooth structure loss on fracture resistance of the tooth tissue appears necessary. The aim of this study was to evaluate the consequences of the loss of different tissues regarding fracture resistance of teeth undergoing root canal treatment without the use of indirect restoration...