Comparing the Effectiveness of Gluma and 940 Nm Laser for Improving Crown Retention With Self-Adhesive Cement Publisher



Amiri P¹ ; Tekie G¹ ; Azizi A¹ ; Lawaf S² Show Affiliations
Source: Journal of Dentistry (Iran) Published:2025

Abstract

Statement of the Problem: The retention of dental crowns plays a pivotal role in their long-term success and maintenance. According to the ongoing controversy about the effect of GLUMA desensitizer and diode laser on the retention of full metal crowns, this study seeks to investigate the effectiveness of two different methods in enhancing the bond strength of full-metal crowns. Purpose: This study was developed to compare the effect of 940nm diode laser and GLUMA desensitizer on the bond strength of full-metal crowns cemented by self-adhesive resin cement (RelyX U200). Materials and Method: In this experimental study, 30 sound permanent maxillary first premolars were prepared; a 0.5-0.7mm chamfer finish line was prepared above the ce-mentoenamel junction. The teeth were randomly divided into three groups: 1. control group (n=10, no treatment) 2. 940nm diode laser (N=10) 3. GLUMA desensitizer (N=10). All crowns were cemented with self-adhesive resin cement (RelyX U200), and the bond strength was measured by universal testing machine. Data were analyzed by ANOVA and Post HOC Tukey test in SPSS Ver 20. Results: Crown retention in the 940 nm diode laser group (166.86±34.25 N) was significantly lower than the GLUMA desensitizer group (318.59±56.31 N) (p< 0.05), but there was no significant difference with the control group (138.17±40.81). Crown retention in the GLUMA desensitizer group was significantly higher than the other groups (p< 0.05). Conclusion: Results of this study showed that GLUMA desensitizer had a positive effect, and 940nm diode laser had no effect on the retention of crowns cemented by self-adhesive resin cement. © 2025, Shiraz University of Medical Sciences. All rights reserved.