Effect of surface preparation with Nd:YAG and Er,Cr:YSGG lasers on the repair bond strength of lithium disilicate glass ceramic to a silorane-based composite resin.

Mohammad Esmaeel Ebrahimi Chaharom,Fatemeh Pournaghi Azar,Rezvan Nasiri,Narmin Mohammadi

doi:10.15171/joddd.2018.003

Mohammad Esmaeel Ebrahimi Chaharom, Fatemeh Pournaghi Azar + Show 2 more

Open Access

https://doi.org/10.15171/joddd.2018.003

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Abstract

Background. This study was undertaken to evaluate the repair bond strength of lithium disilicate glass ceramic to a silorane-based composite resin after surface preparation with Nd:YAG and Er,Cr:YSGG lasers. Methods. A total of 102 lithium disilicate glass ceramic samples (IPS e.max Press), measuring 5 mm in diameter and 4 mm in thickness, were randomly assigned to 6 groups (n=17): group 1, no surface preparation (control); group 2, acid etching with 9.5% hydrofluoric acid (HF); group 3, surface preparation with 4.5-W Nd:YAG laser; group 4, surface preparation with 6-W Nd:YAG laser; group 5, surface preparation with 1.5-W Er,Cr:YSGG laser; and group 6, surface preparation with 6-W Er,Cr:YSGG laser. After preparation of surfaces and application of silane, all the samples were repaired with the use of a silorane-based composite resin, followed by storage in distilled water at a temperature of 37°C for 24 hours and thermocycling. Finally, the samples were subjected to a shearing bond strength test; the fracture modes were determined under a stereomi-croscope. Results. There were significant differences between the HF group and the other groups (P=0.000). Two-by-two comparisons of the other groups revealed no significant differences (P>0.05). Conclusion. Use of HF proved the most effective surface preparation technique to increase the repair bond strength between lithium disilicate glass ceramic and silorane-based composite resin; compared to the control group.

Highlights

In recent years there has been an ever-increasing interest in the use of inlays, onlays and ceramic lam-JODDD, Vol 12, No 1 Winter 2018 inates due to their high esthetic appearance.[1]
A total of 102 lithium disilicate glass ceramic samples (IPS e.max Press), measuring 5 mm in diameter and 4 mm in thickness, were randomly assigned to 6 groups (n=17): group 1, no surface preparation; group 2, acid etching with 9.5% hydrofluoric acid (HF); group 3, surface preparation with 4.5-W Nd:YAG laser beams (Nd):YAG laser; group 4, surface preparation with 6-W Nd:YAG laser; group 5, surface preparation with 1.5-W Er,Cr:YSGG laser; and group 6, surface preparation with 6-W Er,Cr:YSGG laser
The results of the present study showed that etching with 9.5% hydrofluoric acid is the most effective method for surface preparation of IPS e.max Press ceramic to achieve a stronger bond to a silorane-based composite resin

Summary

Introduction

In recent years there has been an ever-increasing interest in the use of inlays, onlays and ceramic lam-JODDD, Vol 12, No 1 Winter 2018 inates due to their high esthetic appearance.[1]. Lithium disilicate glass ceramic is a new ceramic with high strength, which is used to fabricate full crowns and very thin veneers.[6] Different techniques are used to achieve a bond with lithium disilicate glass ceramic, with advantages of chemical bonds and mechanical retention at ceramic‒resin interface.[7] When etching is carried out with HF and silane is applied, the bond strength of composite resin to different ceramics increases significantly.[8] etching with HF is dangerous for the patient and the dentist, and HF should be completely removed before the bonding procedure. Use of laser has been suggested as an easy and safe technique for preparation of dental material surfaces.[1]. This study was undertaken to evaluate the repair bond strength of lithium disilicate glass ceramic to a siloranebased composite resin after surface preparation with Nd:YAG and Er,Cr:YSGG lasers

Methods

Results

Conclusion