Effect of Er:YAG and Er,Cr:YSGG Lasers on Ceramic Bracket Debonding from Composite Blocks
Objectives: This study aimed to assess the effect of erbium-doped yttrium aluminum garnet (Er:YAG) and erbium, chromium: yttrium, scandium, gallium, garnet (Er,Cr:YSGG) lasers on ceramic bracket debonding from the surface of composite blocks.
Materials and Methods: Thirty-six composite blocks were fabricated of Filtek Z250 (3M ESPE) light-cure composite. The surface of blocks was etched with 37% phosphoric acid for 30 seconds and then rinsed with water for 20 seconds and dried. Maxillary right central incisor ceramic orthodontic brackets (GAC, USA) were bonded to surfaces of composite blocks using Transbond XT adhesive (3M Unitek, USA) and cured for 40 seconds. Twelve samples were irradiated with Er:YAG laser with 3 W power while 12 samples were irradiated with Er,Cr:YSGG laser with 3 W power, and brackets were then debonded. Twelve samples served as controls. The adhesive remnant index (ARI) score and bracket or composite cracks were evaluated under a stereomicroscope (SMZ800, Nikon).
Results: The mean shear bond strength was 17.01±5.22 MPa in Er:YAG laser, 18.03±6.46 MPa in Er,Cr:YSGG laser and 16.61±6.73 MPa in the control group. The difference in this respect was not significant among the three groups (P=0.835). The difference in ARI scores and enamel and composite cracks was not significant either (P>0.05).
Conclusion: This study did not show any reduction in ceramic bracket bond strength to composite blocks after Er:YAG and Er,Cr:YSGG laser irradiation. However, considering the absence of similar studies, further investigations using different types of lasers with various powers are recommended to cast a final judgment in this respect.
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