Bonding of adhesives to Er:YAG laser-treated dentin

Abstract

Objective:The shear bond strength of adhesives applied to dentin was investigated after irradiation with an erbium-doped yttrium aluminum garnet (Er:YAG) laser.Methods:Superficial and deep dentin specimens from human molars were treated either with carbide bur or an Er:YAG laser. Two etch and rinse adhesives (Single Bond and XP Bond) and two self-etch adhesives (Prompt L-Pop and Xeno III) were employed to bond the composite. Shear bond strength (SBS) was determined after storage in water for 24 h using a universal testing machine with a crosshead speed of 0.5 mm/min. Failure patterns and modes were analyzed and evaluated using a stereomicroscope. In addition, samples were processed for Scanning Electron Microscopy SEM evaluation. A linear mixed model was used, and pairwise comparisons were made using the Bonferroni test.Results:Results showed significant differences between the levels of dentin treatment (p=.01) in carbide bur-cut dentin and lased dentin, as well as significant interaction effects due to the depth of dentin and the bonding system used. The etch and rinse adhesives bonded less effectively with lased dentin than with carbide bur-cut dentin, while self-etch adhesives bonded equally well with lased and bur-cut superficial dentin but much less effectively with lased deep dentin than with bur-cut deep dentin. SEM revealed a predominantly adhesive failure mode in laser-ablated fractured specimens, while a mixed failure mode was apparent in the bur-cut fractured specimens.Conclusions:Cavities prepared by laser seem less receptive to adhesive procedures than conventional bur-cut cavities.

Cavity Preparation by Laser in Primary Teeth: Effect of 2 Levels of Energy Output on the Shear Bond Strength of Composite Restoration to Dentin

“…Bonding to permanent teeth has been studied extensively. The results of this study about the performance of Single Bond and Clearfil SE Bond were in accord with those by Celik et al 22 and da Silva et al 23 and in contrast to the studies by Ramos et al, 15 De Munck et al, 17 and Koliniotou-Koumpia et al 14 The results of the present study cannot be reliably compared to the outcomes of the conducted research on the permanent teeth. Many studies have suggested that the permanent tooth dentin has some morphological and structural differences in comparison with primary tooth dentin.…”

“…Some studies found laser treatment to negatively influence the bond strength and leakage of adhesive dentin interface. [14][15][16][17][18][19][20][21] Some other results have reported no difference in the bond strength or leakage of adhesive restorations between bur and laser prepared restorative cavities. [22][23][24][25] At different laser parameters, different amount of tooth ablation and thermo-chemical changes occur on tooth surfaces, resulting in different performances from the same adhesives.…”

Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: An in vitro study

“…This outcome is associated with the disintegration and structural changes in dentin tubules corresponding to the excessive energy. Ceballo et al [33] and Koliniotou-Koumpia et al [20] reported denaturing of the tooth surface collagen ber following laser irradiation. The denaturing of collagen bers reduces surface porosity, which is not conducive to the penetration of adhesive [34].…”

The effect of an erbium, chromium: yttrium-scandium-gallium-garnet laser on the microleakage and bond strength of silorane and micro-hybrid composite restorations

“…[16] Several studies have shown that the microleakage is minimal when the bonding between the restoration and the tooth is adequate. [12,18,27,30,[33][34][35][36] Several previous studies similar to ours investigated the effects of preparation with an erbium laser and convantional burs on marginal microleakage. [10,14,24,[37][38][39][40] Some of these studies found that lasers produced equal or better microleakage scores than burs, [38][39][40] and other studies have reported the opposite.…”