Journal
CLINICAL ORAL INVESTIGATIONS
Volume 26, Issue 12, Pages 6907-6916Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00784-022-04645-0
Keywords
PEEK; Fiberglass post; Resin cement; Bond strength; Mechanical aging; CAD-CAM
Categories
Funding
- Brazilian National Council for Scientific and Technological Development (CNPq) [310089/2016-6]
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This study aimed to evaluate the bond strength of different types of posts and resin cements. Results showed that milled PEEK posts could be a good clinical option for rehabilitation of extensively destroyed teeth. This could reduce clinical time for treatment.
Objectives To evaluate the bond strength of four types of posts (pre-fabricated fiberglass post, fiberglass post anatomized with composite resin, milled fiberglass post, and milled polyetheretherketone (PEEK) post), and two types of resin cements (conventional and self-adhesive) by assessing immediate bond strength and post-mechanical aging at each root third. Materials and methods Bovine endodontically treated roots (16 groups, n = 8) were prepared and the posts were produced and luted; the specimens of aging groups were cycled (300,000 cycles under 50 N load at 1.2 Hz frequency); six slices of each root were obtained; push-out test was performed by using a universal testing machine (500 N load at 1 mm/min cross speed); fracture pattern was classified into five levels. The statistical analyses used were three-way ANOVA, Tukey's test (for bond strength), and Fisher's test (for fracture pattern) (alpha < 0.05). Results Differences were found between the cements for posts (conventional: p < 0.001; self-adhesive: p = 0.002), whereas no difference was found for root region (p = 0.941; p = 0.056, respectively); analysis of each root showed significant differences for cements (p < 0.001), posts (p < 0.001), and mechanical cycling (p = 0.001); in terms of double interaction, differences were found for posts and mechanical cycling (p = 0.005); no other interactions were observed (double or triple); the fracture pattern showed difference between the groups for both cements. Conclusions Milled PEEK posts seem to be a good clinical option, but they require improvement of CAD-CAM technology and advances towards their adhesion. Clinical relevance Milled posts are promising and can reduce clinical time for rehabilitation of extensively destroyed teeth.
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