An experimental analysis of stresses in simulated flared root canals subjected to various post–core applications

Abstract

Cervical root fracture is a major clinical problem in flared root canals treated with different post and core applications. This in vitro study evaluated the stress transfer of different post and core systems to the cervical part of the artificially created flared root canals, by using strain gauges. The post-core systems investigated were: (a) cast post-core system without resin reinforcement, (b) cast post-core system with resin reinforcement, (c) pre-fabricated post and resin core with resin reinforcement. The post-core systems which were cemented on simulated roots were subjected to a load applied at an angle of 45 degrees to the long axis of the simulated roots. The strain gauges which were cemented to the cervical part of simulated roots were connected to the data acquisition module to measure and record the changes in strain data. Specimens restored with resin reinforcement either with cast post-core or pre-fabricated post and resin core transferred the stress to the cervical part of the artificial roots at a rate lower than conventional cast post-core system (P = 0.001; anova and Tukey's post hoc test). It was concluded that the resin reinforcement of root canals before post-core applications reduces the stresses at the cervical part of the root surfaces.

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

“…Experimental studies of cast post revealed that cast post demonstrated high incidence of catastrophic root fracture on fracture strength testing. Because of a marked difference in modulus of elasticity between cast post and dentin, however, it cannot reinforce root structure particularly in the case of thin-walled immature tooth 11) . EverStick � Post has comparable elastic modulus with dentin and can be customized in size by bonding to each other to adapt a large flared canal.…”

“…Previous studies demonstrated that root reinforcement with composite resin in immature tooth improves fracture resistance 5,11) . Nevertheless, comparative studies of fiber post and titanium post in flared large canal reinforced with composite resin has not been published.…”

Microleakage in Overflared Root Canals Restored with Different Fiber Reinforced Dowels

“…In addition, the closer the conformance of the fibrous reinforcement is to the original structure, the better the stress transfer, and the lower the occurrence of residual stresses from shrinkage of the luting resin agent. [30][31] Although the preservation of the remaining tooth structure and restoration of a severely weakened endodontically-treated tooth have been evaluated in different clinical reports [26][27][28]32 and research articles, [33][34][35][36] based on the knowledge of the authors of the current study, no study has evaluated microleakage in overflared root canals restored with different fiber reinforced dowels.…”

Farkli Post-Kor Si̇stemleri̇ni̇n Kirilma Dayaniminin i̇n-Vi̇tro Olarak Değerlendi̇ri̇lmesi̇

“…Fiber post sistemleri diş dokusu ile uyumlu mekanik özellikleri, estetik avantajları ve kullanım kolaylığı açısından sık tercih edilmektedir. Ancak özellikle karbon fiber postlar yüzeylerindeki düşük hidroxil iyonları nedeniyle diş dokusuna ve kor malzemesi olarak kullanılacak kompozite iyi bağlanamamakta ve bu zayıf bağlantı restorasyonda başarısızlığa neden olmaktadır 5 . Lityumdisilikat(IPS Press e-max) ile güçlendiri-lmiş cam seramik restorasyonlar yüksek estetik özellik-lerinden dolayı üst çene ön bölge dişlerinin lamine veneer veya tam seramik veneer ile restorasyonunda sıklıkla tercih edilmektedir.…”