The Effect of ultrasonic irrigation on non-diseased dentine following laser radiation, citric acid and tetracycline hydrochloride conditioning: A sem study.

Abstract

The purpose of this study was to evaluate the effects of Nd:YAG laser treatment and acid conditioning on dentine surface-sin vitro when used alone or in combination with ultrasonic scaling. Twenty-seven 4 x 4 mm dentine specimens were obtained from ten impacted third molars. Each specimen was divided into two equal parts, one irradiated (Exp. A) and the other either scaled ultrasonically or acid conditioned (Exp, B). Specimens were randomly assigned to each of different treatment groups. Specimens in groups 1. 2. 3 (Exp. A) were laser treated with j.O w, J .25 wand 1.5 w respectively. Specimens in groups 4. 5, 6 (Exp, B) were treared for 3 minutes with ultrasonic scaling, citric add and tetracycline hydrochloride respectively. After laser radiation and acid conditioning, six specimens in each experimental group (A, B) were scaled ultrasonically for 3 minutes. The remaining three specimens of each experimental group CA, B) did not receive any further treatment. The specimens, were then fixed and examined under SEM. The surface of ultrasonically settled and roor conditioned specimens displayed an absence of smear layer. Specimens treated by laser alone exhibited an absence of smear layer at an energy level of 1.0 W, reduction in size of dentinal tubules at 1.25 wand fissuring and cracking at 1.5 w. Combined laser and ultrasonic scaling exhibited surface characteristics not seen in specimens treated by laser radiation alone. Acid conditioning and ultrasonic scaling improved the exposure of collagen fibrils.