Abstract
Objective. To evaluate the bond strength of a prefabricated glass fiber post to the root dentin with two resin cements using the push-out test. Material and Methods. Thirty fiber posts (White Post ECD) were cemented in human endodontically treated anterior teeth with two resin cements (n=15): RelyxTM ARC and AllCem. The roots were transversely sectioned and divided in cervical, middle and apical thirds after 48 h of cementation. The specimens' retention was tested by push-out method. The results were analyzed by 2-way ANOVA and Tukey’s test (p<0.05). Results. There were no significant differences in the bond strength between the resin cements. The bond strength was higher in cervical third than in middle and apical thirds for both resin cements. It was observed higher percentages of adhesive failures followed by mixed. Conclusions. Both resin cements are indicated in the cementation of glass fiber post.KeywordsDental prosthesis; Post and core technique; Biomechanical phenomena.
Highlights
The post and core technique has been used for the restoration of endodontic treated teeth for the last 250 years [1,2]
This study aimed to evaluate the pushout bond strength of a glass fiber post and two dual-resin cements in different thirds of the root and analyze adhesion in the post-cement-dentin interface
Regarding the two resin cements, bond strength was higher in the cervical third (9.88 ± 5.67 MPa) than in medium and apical thirds (7.2 ± 3.10 MPa and 5.2 ± 3.08 MPa)
Summary
The post and core technique has been used for the restoration of endodontic treated teeth for the last 250 years [1,2]. Posts and core can replace lost dental structure, provide support and retention for prosthetic crowns [35]. The post core should proper transfer stresses to the tooth, avoiding root weakness, which reduces fracture resistance, or loss of retention between post and root canal dentin [6,7,8]. The association of a resin cement to glass fiber post reduces post fractures and provides a better distribution of stress to the remaining tooth structure because both have an elasticity modulus similar to dentin. Glass fiber posts are indicated for aesthetic restorations because their color is similar to the tooth and do not oxidize [2,3,4,9]
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