Effect of the Er: YAG laser on the shear bond strength of conventional glass ionomer and BiodentineTM to dentine

Abstract

Objectives:The purpose of this study was to determine if Er: YAG laser etching improves the shear bond strength (SBS) of Biodentin™ and GC Fuji IX® to dentine.Materials and Methods:Forty human dentine specimens were standardized and embedded in stone. The specimens were randomized into four groups (n = 10). Twenty samples were treated with the Er: YAG laser radiation and 10 of these restored with GC Fuji IX® and 10 with Biodentine™. The remaining 20 specimens acted as controls (no laser treatment); 10 were restored with GC Fuji IX® and 10 with Biodentin™. All samples were then stored in an incubator at 37.5°C and 100% humidity for 7 days. The SBS was determined using a Zwick universal testing machine. A two-way analysis of variance test was used to evaluate the statistical difference in SBS between the groups. An independent sample t-test was used to determine the statistical significance of differences between control and lased groups within the same material.Results:A highly statistically significant difference in SBS was found with the laser treatment (P = 0.0001) and material (i.e., Biodentin™ or Fuji IX® (P = 0.0001). The GC Fuji IX® group recorded the highest mean SBS required to dislodge the material from the laser-treated dentine surface (1.77 ± 0.22 Mega-Pascal [MPa]). The mean SBS of Biodentin™ to dentine following the laser radiation (1.12 ± 0.16 MPa) was significantly greater compared to the nonlased dentine (0.53 ± 0.09). Pearson Chi-square test indicated a nonsignificant relation between shear strength and mode of failure (P = 0.467).Conclusion:Laser etching of the dentine surfaces yielded a significant increase in the bond strength for both GC Fuji IX® and Biodentin™. The SBS of Biodentin™ to dentine is greater than with conventional glass ionomer (Fuji IX®).

Evaluation of the bond strengths of restorative materials to primary tooth dentin treated with different pulpotomy techniques

“…In our study, the SEM evaluation visualized Biodentine ® residues on the dentin surfaces of the samples and also showed that the tubules were occluded with these residues. In a similar way, some studies also reported that Biodentine ® extended deep into dentinal tubules and the residues thereby occluded the tubules (Aljdaimi, Devlin, & Dickinson, 2018;Atmeh et al, 2012). Shalan, Awad, and El-Fallal (2012) reported that ferric sulfate and formocresol decreased the shear bond strength of composite resin cement to primary tooth dentin, thereby leading to a negative effect on the molecular structure of the adhesive system.…”

“…In our study, the SEM evaluation visualized Biodentine ® residues on the dentin surfaces of the samples and also showed that the tubules were occluded with these residues. In a similar way, some studies also reported that Biodentine ® extended deep into dentinal tubules and the residues thereby occluded the tubules (Aljdaimi, Devlin, & Dickinson, 2018; Atmeh et al, 2012).…”

Marginal Microleakage of Glass Ionomer-Based Restorations After Conventional Cavity Preparation and Er: YAG Laser Irradiation

“…Studies have shown that altering the surfaces of the teeth by lasers improves the adhesion of the restorations (20)(21)(22). In addition, there is little information in the literature about the sealing ability of Class V cavities prepared with Er: YAG laser and restored with CGICs.…”

Microshear Bond Strength of Glass Ionomer to Primary Dentin following Surface Treatment by Bur and Er,Cr:YSGG Laser

“…Due to numerous advantages, this laser has been suggested for enamel and dentin surface treatment to enhance the bond strength (7). Considering the numerous advantages of application of Er,Cr:YSGG laser in pediatric dentistry such as optimal acceptance by children and parents due to its minimal invasiveness and higher cooperation of pediatric patients during restorative treatments with laser (3), the low bond strength of GI to tooth surface, lack of sufficient studies regarding the efficacy of Er,Cr:YSGG laser for dentin surface preparation, and the controversial results of previous studies (8,9), this study was designed to assess the microshear bond strength of GI to primary dentin following surface preparation by bur in comparison with Er,Cr:YSGG laser irradiation.…”