Evaluation of surface roughness and push-out bond strength of glass fiber post with and without surface pretreatments: A scanning electron microscopy study

[摘要] Objective:  The aim is to evaluate and compare the surface roughness and push-out bond strength of glass fiber post with and without surface pretreatments using scanning electron microscopy. Materials and Method:  A total of 40 extracted human maxillary central incisors selected were decoronated at 15 mm coronally from the root apex. The teeth were subjected to root canal treatment and the postspace preparation was done with Peeso reamers size 1, 2, and 3, leaving a minimum 4 mm apical seal and created a standard postspace of 10 mm. Forty glass fiber posts (Easy Post, Dentsply) were divided into four groups based on surface treatment of the post with 10 in each. Group I: Without Pretreatment (Control Group) (10 Nos), Group II: 9.6% hydrofluoric acid (10 Nos), Group III: Sandblasting with 110 μm aluminum oxide particles (10 Nos), and Group IV: erbium: yttrium-aluminum-garnet (Er: YAG) Laser (10 Nos). The surface roughness analysis with and without pretreatment was performed under Scanning Electron Microscope and measured in Mountains map premium 7.4 software. The posts were luted with Self-adhesive resin cement (RelyX U200) and light cured for 40s. Push-out bond strength was evaluated using the universal testing machine; the values were recorded, tabulated, and statistically analyzed. Results:  The push-out bond strength of the post is significantly increased when the postsurface is treated with 9.6% hydrofluoric acid at all three levels. Conclusions:  Acid etching of post with 9.6% hydrofluoric acid increased push-out bond strength significantly without changing the structural integrity of the post whereas Er:YAG can be used as alternative to sandblasting.

[学科分类] 材料科学（综合）

[关键词] Bond strength;erbium;glass fiber post;hydrofluoric acid;scanning electron microscopy