Influence of post types and sizes on fracture resistance in the immature tooth model

Abstract

The purpose of this study was to determine the effect of post types and sizes on fracture resistance in immature tooth model with various restorative techniques. Bovine incisors were sectioned 8 mm above and 12 mm below the cementoenamel junction to simulate immature tooth model. To compare various postand-core restorations, canals were restored with gutta-percha and resin core, or reinforced dentin wall with dual-cured resin composite, followed by placement of D.T. LIGHT-POST, ParaPost XT, and various sizes of EverStick Post individually. All of specimens were stored in the distilled water for 72 hours and underwent 6,000 thermal cycles. After simulation of periodontal ligament structure with polyether impression material, compressive load was applied at 45 degrees to the long axis of the specimen until fracture was occurred.Experimental groups reinforced with post and composite resin were shown significantly higher fracture strength than gutta-percha group without post placement (p < 0.05). Most specimens fractured limited to cervical third of roots. Post types did not influence on fracture resistance and fracture level significantly when cement space was filled with dual-cured resin composite. In addition, no statistically significant differences were seen between customized and standardized glass fiber posts, which cement spaces were filled with resin cement or composite resin individually. Therefore, root reinforcement procedures as above in immature teeth improved fracture resistance regardless of post types and sizes. [J Kor Acad Cons Dent 35(4):257-266, 2010]

Retentive strength of different intracanal posts in restorations of anterior primary teeth: anin vitrostudy

“…In agreement with our results, Braga et al reported that the type of post did not affect the force needed to dislodge the core 36. Kim et al concluded that the type of post did not affect fracture resistance or fracture level in restored permanent teeth 28. Moreover, Pithan et al reported that the adhesion of the materials to dentinal root canal walls was more important than the type of post used as a retainer 18.…”

“…The cement attains favorable characteristics with low light intensity 24. Several studies have reported successful results with resin cements for posts in permanent teeth 25-28…”

A comparative evaluation of fracture resistance of endodontically treated teeth restored with three different post and core systems and two different luting agents – an invitro study

“…7 The criteria for an endodontically treated tooth requiring a post is that the minimum length of remaining solid tooth equal the sum of the biologic width (2.5 mm), the ferrule length (2 mm), the apical seal (4 mm) and the post length (i.e,8.5 mm + post length). 8 The post/dowel selection is influenced by several factors which includes amount of coronal tooth structure, tooth anatomy, position of the tooth in the arch, root length, root width, canal configuration, functional requirements of the tooth, torquing force, stresses, development of hydrostatic pressure, post design, post material, material compatibility, bonding capability, core retention, retrievability, esthetics and crown material. 9 Recently, the material of choice for restoration of root filled teeth has changed from very rigid materials to materials with mechanical characteristics similar to dentine.…”

“…In addition, EverStick Post can be bonded each other and trimmed suitably for adaptation to root canal. 8 In the current study, the fracture resistance of endodontically treated incisors was evaluated when using three post systems and two luting agents. Cast post and core, prefabricated glass fibre post with composite core, and prefabricated zirconia post with composite core were used with two different type of luting agents i.e.…”

Assessment of Fracture Resistance Capacity of Various Post Systems in Endodontically Treated Teeth: In vitro Study

“…But, metal posts had many disadvantages, such as the high incidence of catastrophic root fracture, 3 corrosion, inflammatory reaction, discoloration, and shadowing on the periodontium in the anterior esthetic region. 4 In a recent study, the problems with the overflared canal reinforcement can be solved by a newly released novel, direct, and anatomically adjustable glass fiberreinforced everStick post. This post is a minimally invasive, soft, flexible polymer of polymethyl methacrylate, and resin-impregnated bisphenol A glycidyl methacrylate (bisGMA) uncured glass fiber post.…”