Goldschmidt Stephanie, Collins Caitlyn J, Hetzel Scott, Ploeg Heidi-Lynn, Soukup Jason W
1 Dentistry and Oral Surgery, Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA.
2 Bone and Joint Biomechanics Lab, Department of Mechanical Engineering, College of Engineering, University of Wisconsin-Madison, Madison, WI, USA.
J Vet Dent. 2016 Sep;33(3):151-156. doi: 10.1177/0898756416674379.
The reported failure rate for full veneer crowns in dogs is suboptimal, particularly in teeth with naturally poor retentive features such as the maxillary fourth premolar tooth of dogs. Although the data regarding crown retention on the maxillary fourth premolar in dogs are limited, there are data that suggest the crown failure rate could be similar to that of the canine tooth. Thus, methods to improve retentive features of the preparation design should be pursued. The objective of the present study is to quantify the influence of axial grooves on the dislodgment resistance of full veneer metal crowns in dogs. Crown dislodgment testing was performed on cast alloy dies of the maxillary fourth premolar tooth with unfavorable retentive features prepared with and without axial grooves, to quantify the difference in force required to dislodge a cemented full veneer crown. The force required to cause crown dislodgment was recorded for each crown. Statistical analysis revealed a significant increase ( P < .001) in the force required for crown dislodgment in teeth prepared with axial grooves compared to those prepared without axial grooves.
据报道，犬类全冠修复的失败率并不理想，尤其是在上颌第四前磨牙这类固位特征天生较差的牙齿上。尽管关于犬上颌第四前磨牙牙冠固位的数据有限，但有数据表明牙冠失败率可能与犬齿相似。因此，应探索改善预备设计固位特征的方法。本研究的目的是量化轴向沟对犬类全冠金属冠抗脱位性的影响。对上颌第四前磨牙具有不利固位特征的铸造合金代型进行牙冠脱位测试，这些代型分别制备有轴向沟和无轴向沟，以量化脱位粘结全冠所需力的差异。记录每个牙冠脱位所需的力。统计分析显示，与未制备轴向沟的牙齿相比，制备有轴向沟的牙齿牙冠脱位所需的力显著增加（P <.001）。
