摘要
目的比较3种轴壁聚合度全冠的固位力,探讨其固位效果。方法选用离体上颌前磨牙,进行4°、8°和12°的预备,翻制合金代模,制作金属全冠。比较其粘固前、后的固位力。结果粘固前,4°预备体的全冠脱位力值(177.35±17.13)N,明显大于8°组(102.95±13.66)N和12°组(51.80±9.51)N;粘固后,4°预备体的全冠脱位力值(346.60±30.93)N明显大于8°组(247.95±20.64)N和12°组(216.05±17.35)N。粘固后,4°组脱位力值提高了95.4%,8°组提高140.8%,12°组提高317.1%。结论轴壁聚合度越大,全冠固位力越小。粘固后,轴壁聚合度越大,固位力增幅越大。
Objective To evaluate the influence of different tapers on the retention force of full metal crown in order to study its retention. Methods We chose maxillary premolar, prepared them with 3 kinds of tapers(4°,8° and 12°)under the clinical regulations, restored them with metallic full crowns, and compared the retention without and with cement. Results ①Whether with or without cement, the dislocation force of 4° was significantly greater than those of the group of 8° and 12°. ②After cementation, the dislocation forces of 4°, 8°and 12° increased by 95.4%, 140.8% and 317.1%, respectively. Conclusion Due to the limitations of this study, the retention of the crown at 4° taper was the highest and 12° taper was the lowest. After using glass ionomer, the increased range of retentive value at 12° taper was much more than it was at 4° taper and 8° taper.
出处
《口腔医学》
CAS
2006年第4期293-294,共2页
Stomatology