Comparison of Different Post Systems for Fracture Resistance: An in vitro Study

Abstract

Introduction:Endodontic restoration becomes a challenging task for the clinician because of severe loss of coronal tooth structure owing to trauma, caries, restorative, and endodontic procedures. The restoration of these teeth requires the use of a post and core as individual units or as abutment supports for fixed or removable restorations in a predictable long-term manner.Aim: To compare and assess the compressive bond strength of glass, quartz, and carbon fiber posts restored with porcelainfused-to-metal (PFM) crown. Materials and methods:A total of 45 upper central incisor teeth having straight root canals, similar anatomically root segments, and fully developed apices were selected. Teeth were divided into three groups of 15 teeth after endodontic treatment. Group I: Teeth inserted with the prefabricated glass fiber post. Group II: Teeth inserted with the quartz fiber post. Group III: Teeth inserted with carbon fiber post. The posts were placed and core was fabricated using composite restoration followed by PFM crown cementation using adhesive resin. Compressive load required to fracture the tooth was measured using a universal loading machine. The difference between the variables was assessed by one-way analysis of variance, followed by Tukey's post hoc test. Results:The compressive strength exhibited by carbon fiber posts was highest with a mean of 668.33 ± 26.397, followed by quartz fiber post (635.80 ± 30.390). Least compressive strength was exhibited by glass fiber post (567.53 ± 26.632). An analysis of variance shows statistically highly significant difference (p < 0.005) among the posts used. Conclusion:This study concluded that the carbon fiber posts had higher compressive strength than other quartz, glass fiber posts.Clinical significance: Endodontic treatment results in loss of a significant part of the tooth structure. Posts restore these teeth and provide retention.

A comparative in vitro study of different techniques for removal of fibre posts from root canals

“…Vadavadagi et al . showed that carbon fibre posts have higher compressive strength with less likeliness of fracture than glass and quartz fibre posts. Also, Seefeld et al .…”

Comparative evaluation of fracture resistance of different post systems

“…Post restoration depends on esthetic need, amount of remaining tooth structure, tooth position, and functional load on tooth. [ 1 8 ] Posts can be classified as custom made or prefabricated, metallic or nonmetallic, flexible or stiff, esthetic or nonesthetic types. Post and core interface is the most common site for tooth fractures.…”

“…Post and core interface is the most common site for tooth fractures. [ 1 ] Fracture resistance of restoration with post is directly related to post design, post length, post diameter, core material, and type of cement used. [ 3 7 9 ] It has been observed that core structure provides stress transmission from crown then to post core structure to remaining root dentin.…”

“…Endodontically treated teeth often present with compromised crown structure, which need full-coronal restoration along with post and core restorations. [ 1 2 ] Endodontically treated teeth present with dehydration, altered esthetic, and change in physical characteristics. Hence, successful outcome of pulp-treated permanent teeth needs proper rehabilitation procedure.…”

“…Zirconia posts are newer development in esthetic prefabricated posts. [ 1 2 6 ] Previous studies observed that prefabricated steel post or custom post is nonesthetic and has higher failure rates due to internal stress. [ 3 7 ] Padmanabhan from his study concluded that prefabricated stainless steel post has significantly higher fracture resistance at failure compared to ceramic or carbon posts,[ 3 ] and similarly, Sadeghi from his study found that cast post has higher fracture resistance as compared to zirconia or fiber posts.…”