The effect of Er:YAG and Nd:YAG lasers and total-etch and universal adhesives on composite resin restoration microleakage.

Abstract

Background: The present investigation examined Er:YAG and Nd:YAG lasers efficiency in reducing microleakage when paired with two adhesive systems.

Material and methods: Class V cavities were created on the buccal and lingual sides of 30 extracted premolars. The samples were distributed into the following groups: 1) 37% phosphoric acid + Adper Single Bond 2; 2) Nd:YAG laser + Adper Single Bond 2; 3) Er:YAG laser + Adper Single Bond 2; 4) 37% phosphoric acid + Gluma Universal Bonding; 5) Nd:YAG laser + Gluma Universal Bonding; 6) Er:YAG laser + Gluma Universal Bonding. Each specimen was cured and restored with nanohybrid composite Z350. Dye penetration was used to assess microleakage and examined under a stereomicroscope. The findings were compared using Mann-Whitney, Wilcoxon Signed Ranks, and Kruskal-Wallis tests (α = 0.05).

Results: The microleakage score in the occlusal margin was comparable between the groups. On the other hand, the microleakage in the gingival margin was significantly different between the groups (P=0.004). The post-hoc comparison showed that the microleakage score for samples treated with Er: YAG was significantly lower than those treated with Nd: YAG (P<0.05). The microleakage score in the gingival margin was significantly higher than that of the occlusal margin in all groups (P<0.05), except for the Er: YAG + Single Bond 2 group (P=0.15).

Conclusions: Except for Er:YAG + Single Bond 2, all groups showed more microleakage at the gingival margin compared to the occlusal margin. The Er:YAG laser outperformed the Nd:YAG laser at the gingival margin. Key words:Dental Adhesives, Dental Leakage, Er-YAG Laser, Nd-YAG Laser.