The efficiency of laser application for debonding laminate restorations manufactured of current CAD-CAM materials with different thicknesses

• Published in: Nigerian journal of clinical practice Vol. 24; no. 5; pp. 705 - 711
• Main Authors: Culhaoglu, A, Kilicarslan, M, Gokdeniz, B, Gur, G
• Format: Journal Article
• Language: English
• Published: India Wolters Kluwer India Pvt. Ltd 01-05-2021; Medknow Publications and Media Pvt. Ltd
• Subjects: Ceramics; Chemical properties; Composite Resins; Computer-Aided Design; Computer-aided manufacturing; Dental ceramics; Humans; Laminated materials; Lasers; Materials Testing; Mechanical properties; Methods; Solid-state lasers; Surface Properties; Nigeria; Er: YAG laser; feldspar ceramic; laser crown debonding; Ceramic resin composite; lithium disilicate ceramic
• ISSN: 1119-3077
• DOI: 10.4103/njcp.njcp_415_20

Background: Using lasers for adhesive restoration removal can be practical and atraumatic. Aims: The purpose of this study was to investigate Er: YAG laser exposure on debonding the adhesive cementation between enamel and feldspar ceramic, lithium disilicate-reinforced and resin nano ceramic composite laminate restorations. Materials and Methods: Vita Cerec Blocs, IPS e.max Computer-aided design (CAD). Computer-aided design and manufacturing (CAD-CAM) in full and Lava Ultimate restorative materials were chosen. The 3 × 3 mm2 standardized, 0.5-mm and 1 mm thick specimens were cemented on an enamel surface. After thermocycling, each material group was randomly divided into laser treated and control (non-laser treated) groups. Shear bond strength test was done with a universal testing machine with crosshead speed 0.5 mm/min. Factorial ANOVA Technique and TUKEY HSD multiple comparison test were used for statistical analyses. Moreover, the surface morphology of the debonded samples and the enamel was observed using a scanning electron microscope. Results: The laser application was found to weaken the SBS values significantly (P < 0.05) for all groups; however, the most dramatic SBS decrease was observed for laser treated IPS e.max at both thicknesses. Conclusions: Laser treatment can serve as a practical and effective method that eliminates the risk the enamel damage and restoration fracture.