Methods Thirty teeth were prepared and divided into three groups.One group was air abraded and was acid etched, another one was air abraded, and the other one was acid etched.

• 方法分别对30颗离体牙的牙釉质进行喷磨、喷磨加酸蚀、单纯酸蚀后粘结树脂,测定其剪切强度。