Bonding integrity and compressive strength of re-bonded, surface conditioned and Er Cr YSGG laser treated lithium disilicate ceramics.

Abdulaziz M Albaker,Modhi Aldeeb,Fahim Vohra,Laila Al Deeb,Khold Al Ahdal,Tariq Abduljabbar,Aasem M Alhenaki

doi:10.1177/2280800020910954

Abdulaziz M Albaker, Modhi Aldeeb + Show 5 more

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https://doi.org/10.1177/2280800020910954

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Abstract

The aim of the study was to investigate the shear bond strength (SBS) and compressive strength (CS) of Er Cr YSGG laser (ECL) treated, re-bonded lithium disilicate (LD) ceramic in comparison to standard conventional conditioning (hydrofluoric acid (HFA) and silane). One hundred LD ceramic disks were divided equally for SBS and CS testing. Eighty samples were conventionally surface treated and bonded to resin cement followed by de-bonding of the cement build-up. All de-bonded specimens were divided into four groups based on re-bonding surface treatments (HFA, primer, adhesive, and ECL). Resin cement build-ups were performed in 40 specimens for SBS testing (universal testing machine); however, the remaining 40 specimens were tested for CS. Ten specimens each were used as controls (surface treatment was performed once and no primary resin cement bonding) for SBS and CS assessment. Surface topography was assessed using a scanning electron microscope. The maximum and minimum SBS values were shown by groups: control (33.42 ± 3.28 megapascals (MPa)); and ECL (17.50 ± 2.22 MPa) respectively. The maximum and minimum CSs were displayed by specimens in the ECL group (439.45 ± 70.68 MPa) and the control group (237.28 ± 19.96 MPa), respectively. For ECL specimens, SBS was significantly lower and CS was significantly higher as compared to control specimens. Application of the Er Cr YSGG laser significantly improved the CS of de-bonded ceramic specimens. However, it did not show a positive influence on the bond integrity of re-bonded ceramics in comparison to conventional surface treatment regimes.

Highlights

Ceramics have revolutionized esthetic dentistry and modern veneers made from ceramics are a major tool in smile reconstructions
The control group (Group 1S) showed significantly higher shear bond strength (SBS) values compared to all experimental groups (p < 0.05)
Re-bonding of veneers fabricated with ceramic to tooth dentin is potentially challenging due to the presence of remaining cement on the ceramics and adhesive bond integrity is compromised for re-bonded restorations

Summary

Introduction

Ceramics have revolutionized esthetic dentistry and modern veneers made from ceramics are a major tool in smile reconstructions. In esthetic dentistry, creating a life like smile is a continuous challenge which is dependent on factors including, tooth substrate, ceramic type, luting cement, shade matching, and technical expertise.[1,2,3] Providing a satisfying smile appearance with an acceptable shade is susceptible to error as it depends on operator experience in shade matching. 4) It further becomes a difficult task as high translucent ceramics are adhesively bonded to teeth, in an irreversible way. Tooth veneers of ceramic material, are surface treated to create micro-retentions and are adhesively bonded to the tooth with resin luting cements to enhance its fracture resistance. A common technique is the use of dental burs on a high-speed or slow-speed handpiece with copious water irrigation. This method presents the potential for irreversible damage and fracture of the veneers.

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