Effect of Nd:YAG Laser with/without Graphite Coating on Bonding of Lithium Disilicate Glass-Ceramic to Human Dentin

Amjad Abu Hasna; Stephanie Semmelmann; Fernanda Alves Feitosa; Danilo De Souza Andrade; Franklin R Tay; Cesar Rogério Pucci

doi:10.1155/2021/6677159

Effect of Nd:YAG Laser with/without Graphite Coating on Bonding of Lithium Disilicate Glass-Ceramic to Human Dentin

Int J Dent. 2021 Mar 15:2021:6677159. doi: 10.1155/2021/6677159. eCollection 2021.

Authors

Amjad Abu Hasna¹, Stephanie Semmelmann², Fernanda Alves Feitosa³, Danilo De Souza Andrade², Franklin R Tay⁴, Cesar Rogério Pucci²

Affiliations

¹ Department of Restorative Dentistry, Endodontics Division, Institute of Science and Technology, Sa˜o Paulo State University (UNESP), Sa˜o José dos Campos, SP, Brazil.
² Department of Restorative Dentistry, Institute of Science and Technology, Sa˜o Paulo State University (UNESP), Sa˜o José dos Campos, SP, Brazil.
³ São Lucas University, Avenida Da Saudade 26 Caçapava, SP, Brazil.
⁴ Department of Endodontics, The Dental College of Georgia, Augusta University, Augusta, GA, USA.

Abstract

This study evaluated the effect of different surface treatments on the tensile bond strength between lithium disilicate glass-ceramics, resin cement, and dentin. Fifty truncated cone-shape glass-ceramics were divided into five groups (n = 10): G1, control: 10% hydrofluoric acid (HF); G2, Nd:YAG laser + silane; G3, Sil + Nd:YAG laser; G4, graphite + Nd:YAG laser + Sil; and G5, graphite + Sil + Nd:YAG laser. Fifty human third-molars were cut to cylindrical shape and polished to standardize the bonding surfaces. The glass-ceramic specimens were bonded to dentin with a dual-cured resin cement and stored in distilled water for 24 h at 37ºC. Tensile testing was performed on a universal testing machine (10 Kgf load cell at 1 mm/min) until failure. The bond strength values (mean ± SD) in MPa were G1 (9.4 ± 2.3), G2 (9.7 ± 2.0), G3 (6.7 ± 1.9), G4 (4.6 ± 1.1), and G5 (1.2 ± 0.3). Nd:YAG laser and HF improve the bond strength between lithium disilicate glass-ceramics, resin cement, and dentin. The application of a graphite layer prior to Nd:YAG laser irradiation negatively affects this bonding and presented inferior results.