Evaluation of the fracture resistance of root filled thin walled teeth restored with different post systems

Abstract

Background Restoration of the teeth with extensive root canals with different post systems is a challenge for clinicians. Evaluation of these systems is important for clinical success. The aim of this study was to compare the fracture resistance and fracture mode of endodontically treated thin-walled teeth which restored with different post systems. Methods Eighty extracted and endodontically treated maxillary canines were divided into 4 groups (n = 20) and the thickness of the radicular dentin walls was reduced by using diamond burs. Each root was embedded in an autopolymerizing resin with a 0.25 mm layer of vinyl polysiloxane material to simulate the periodontal ligament. The subgroups were restored with one of the following post systems: only composite resin (Group 1), cast post (Group 2), glass-fiber post (Group 3), and I-TFC post (Group 4). The samples were subjected to a gradually increasing force (0,5 mm/min). The force required to fracture was recorded, and the data were analyzed with ANOVA, Tukey test's and Chi–Square test (p < 0.05). Results The highest fracture resistance was recorded for Group 2, followed by the Group 3, Group 4, and Group 1. Differences in the fracture resistance of teeth were significant among the groups (p < 0.05). The fracture resistance of Group 4 was significantly different than the other tested post systems (p < 0.05). Conclusions The lowest fracture resistance was recorded for Group 1, but among all post systems, Group 4 had the lowest fracture resistance. The fracture mode of the fiber posts (Radix and I-TFC posts) would permit repair of the tooth.

Fracture Resistance of Endodontically Treated Teeth Restored With Lithium Disilicate Crowns Retained With Fiber Posts Compared to Cerasmart and Celtra Duo Endocrowns (In Vitro Study)

“…Post spaces were prepared to a drilling depth of 10 mm from the decoronated surfaces. Each glass fiber post was reduced to the length of 13mm by reducing the coronal part with a diamond separating disc resulting in a dowel extending 3mm above the decoronated surface and posts were cemented according to the manufactures instructions using dual sure self-adhesive resin cement (Clearfil SA) (6,7) .…”

“…The canals were irrigated then dried with paper points followed by etching with 37% phosphoric acid for 15 seconds. Canals were then thoroughly rinsed with water, dried with compressed air and paper points **** (6) . Light cure adhesive bond was applied inside the root canal using micro-brush ***** then rubbed to canal walls for 10 seconds using a micro-brush followed by removal of excess solvent by compressed air for 1-3 seconds.…”

“…(7) Posts were cemented using dual cure selfadhesive resin cement (Totalcem) and the desired amount of light-core material was injected around the fiber post and inside a transparent celluloid crown ****** then adapted over the post to fabricate the core build up in a standardized manner. (6,8,9) (2346) Nada Heikal, et al E.D.J. Vol.…”

Evergreen influenza – Tackling an old enemy with fresh munitions

“…Öztürk et al. undertake a comparison of the fracture resistance and mode of extracted and endodontically treated thin-walled teeth restored with different post systems by subjecting them to increasing mechanical constraints [26] . The authors find that the cast post displays the highest and the I-TFC post the lowest fracture resistance, while a glass-fiber post and an I-TFC post allow for tooth repair following fracture.…”

Effects of Both Fiber Post/Core Resin Construction System and Root Canal Sealer on the Material Interface in Deep Areas of Root Canal

“…The complete polymerization of composite resin for construction does not occur in the deep areas of the root canal [ 15 , 16 , 17 , 18 ], and the unpolymerized layer remains in the post cavity, even with the use of dual-cure-type composite resin for chemical polymerization [ 19 , 20 ]. Recently, a construction system combining a light-cure composite resin and fiber post with high translucency was developed and clinically applied to increase the resin polymerization rate in deep areas of the root canal [ 21 , 22 , 23 , 24 , 25 ]. Root canal filling materials and core construction materials have improved the sealing effectiveness in each development process.…”