Lara Christie Monteiro1, Vanessa Gallego Arias Pecorari2, Isabela Guerra Gontijo3, Giselle Maria Marchi3, Débora Alves Nunes Leite Lima3, Flávio Henrique Baggio Aguiar3. 1. Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Bairro Areão13.414-093, Piracicaba, SP, Brazil. laracmonteiro@gmail.com. 2. Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Bairro Areão13.414-093, Piracicaba, SP, Brazil. 3. Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Bairro Areão13.414-093, Piracicaba, SP, Brazil.
Abstract
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) (α < 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.
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) (α < 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.
Authors: Milena Cadenaro; Tatjana Maravic; Allegra Comba; Annalisa Mazzoni; Lidia Fanfoni; Tom Hilton; Jack Ferracane; Lorenzo Breschi Journal: Dent Mater Date: 2018-12-13 Impact factor: 5.304
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