桩冠是利用冠钉插入根管以获得固位,用于治疗牙体缺损的修复体,是前牙经常采用的修复方法。桩冠的固位良好,外形和牙色均接近天然牙,已经使用了250多年,至今仍被广泛应用于临床。我国目前制作桩冠的材料主要为塑料,在技工室完成,但存在一些严重缺点,如制作工艺复杂、塑料变色、硬度较差、冠钉透露、切端易磨损、舌侧塑料破碎、脱落、冠钉与塑料连接不好、有分离现象、成品塑料牙面易脱落等,致使桩冠不能继续使用。改良式桩冠克服了传统桩冠的上述缺点,以光固化复合树脂、自制冠钉、薄贴片为材料,在患者口内一次完成。 Post crown is the use of crown nail inserted into the root canal to obtain retention, for the treatment of dental defects of the restoration, is often used anterior approach to repair. Post crown is well retained, shape and tooth color are close to natural teeth, has been used for more than 250 years, is still widely used in clinical practice. At present, the material of the pile crown in our country is mainly plastic, which is finished in the technician's room. However, there are some serious shortcomings such as complex manufacturing process, plastic discoloration, poor hardness, crown nail disclosure, easy wear of cut ends, Nails and plastic connections are not good, there is a separation phenomenon, the finished plastic easy to fall off the tooth surface, resulting in post crown can not continue to use. The improved pile crown overcomes the above shortcomings of the traditional pile crown, and uses the light-cured composite resin, the self-made crown nail and the thin patch as the materials to be completed once in the patient's mouth.