Analysis of ER, Cr: YSGG Laser Effect on Retention of Sealant

Aim: The purpose of this research was to compare the effect of laser and other
methods (air abrasion and conventional) on retention of sealants measured by micro
shear bond strength.
Methods& Materials: In these experimental in vitro study sound premolars teeth
were used and sectioned mesiodistally with ground section. The buccal & lingual
surfaces were selected for experimental analysis. Specimens were divided randomly
into 3 groups. In Group I, II and III samples were prepared with 37% phosphoric acid,
air abrasion + acid etching and irritation by Er, Gr: YSGG (power 2W) and acid
etching respectively. Bonding was then applied and sealants in micro bore tygon tube
(diameter 0.7 mm, height 1mm) were on surface. Micro shear bond strength was
analyzed statistically. Data was submitted to ANOVA and Tukey Test.
Results: Mean micro shear bond strength of group I was 23.44 ± 6.9 Mpa, for group
II 39.09±15.11 Mpa and for group III, 21.44± 6.18 Mpa respectively. A statistically
significant difference (p<0.01) was observed. Group II (air abrasion with etching)
showed the highest retention (micro shear bond strength)
Conclusion: Considering the smooth surface enamel used in this study, it can be
concluded that:
1- Irradiation laser before etching can not increase the retention of sealants.
2- Use of air abrasion before etching showed medium performances in retaining
the sealants.
Keywords: shear bond strength, retention, sealants