Year : 2024

Volume : Volume 16

Issue : Issue 5

Address for correspondence :
Dr. Rutu Pancholi
pancholirutu179@gmail.com

Abstract

This study evaluated the bond strength of composite resin to dentin following different surface pretreatment methods: Air abrasion, acid etching, and a combination of both. Twenty-four extracted human molars were randomly assigned to three groups (n = 8). The occlusal dentin surface of each tooth was exposed, creating a standardized smear layer. In Group 1, dentin was conditioned with 37% phosphoric acid for 15 s. Group 2 received air abrasion using 24 µm particles at 40 psi. Group 3 underwent a combination of air abrasion followed by phosphoric acid etching. Composite cylinders, 4 mm in diameter, were bonded to the treated dentin in two increments. Shear bond strength was measured using a universal testing machine at a crosshead speed of 0.5 mm/min. Mean bond strengths and standard deviations (in MPa) were calculated. Data were analyzed using one-way analysis of variance followed by a post hoc test. Group 3 demonstrated a statistically significant increase in bond strength compared to Groups 1 and 2 (P < 0.05).