作者用复合树脂修复91颗乳磨牙Ⅱ类洞,在追踪6年而脱落的32颗牙上研究乳磨牙Ⅱ类洞复合树脂修复物的适合性,继发龋,细菌侵入和牙髓反应。乳磨牙Ⅱ类洞的邻面预备达牙本质,颊、舌面扩展到自洁区,颊、舌洞缘作斜面,颈缘不作斜面;(牙合)面预备成斜角,不达牙本质。橡皮障隔离实验牙,0.1％洗必 The authors used composite resin to repair 91 catgut-¢ ò-like cavities, studied the suitability of the primary resin-type II resin composite restorations, secondary caries, bacterial invasion and endodontic reaction on 32 teeth that had been traced for 6 years. Proximal surface of Class II molars prepared for dentin, cheek, tongue surface extended to the self-cleaning area, buccal, lingual edge of the bevel, neck edge without bevel; (occlusal) surface preparation bevel, . Rubber isolation test teeth, 0.1% wash will