Donegan S J, Knap F J
Marquette University School of Dentistry, Milwaukee, WI 53201-1881, USA.
J Prosthodont. 1995 Dec;4(4):226-32. doi: 10.1111/j.1532-849x.1995.tb00346.x.
This study focuses on the curvature and inclination of the lingual surfaces of the maxillary anterior teeth from the transition point on the cingulum to the incisal edge.
On 32 sets of mounted casts, 768 measurements were made of the curvature of the lingual surfaces utilizing radius gauges. The inclination of the lingual surface relative to the occlusal plane was recorded. The relationship of the incisal edge of the mandibular teeth to the transition point on the cingulum of the maxillary teeth was determined. Centric occlusion contact was noted on each tooth.
Significant differences were found between the measured areas of any one tooth and between the types of teeth. The average radius ranged from 20.5 mm on the mesial ridge of the canine to 5.3 mm in the fossa of the central. The average inclination of the lingual surfaces was 46 degrees. In centric occlusion, 97% of the canines and 59% of the centrals and laterals were in contact with the opposing teeth. These contacts occurred 2.8 mm incisal to the transition point. The centrals contracted two opposing teeth (45%), and canines contacted one opposing tooth (53%).
The function and curvature of the incisor teeth vary considerably from those of the canines. Overcontouring the lingual surfaces of the maxillary incisors to gain contact is not normal and may be detrimental.
本研究聚焦于上颌前牙舌面从切缘嵴上的过渡点到切缘的曲率和倾斜度。
在32副已安装的模型上，使用半径规对舌面曲率进行了768次测量。记录舌面相对于咬合平面的倾斜度。确定下颌牙齿的切缘与上颌牙齿切缘嵴上过渡点的关系。记录每颗牙齿的正中咬合接触情况。
在任何一颗牙齿的测量区域之间以及不同类型牙齿之间均发现了显著差异。平均半径范围从尖牙近中嵴处的20.5毫米到中切牙窝处的5.3毫米。舌面的平均倾斜度为46度。在正中咬合时，97%的尖牙以及59%的中切牙和侧切牙与对颌牙齿接触。这些接触发生在过渡点切方2.8毫米处。中切牙与两颗对颌牙齿接触（45%），尖牙与一颗对颌牙齿接触（53%）。
切牙的功能和曲率与尖牙有很大差异。过度塑造上颌切牙舌面以实现接触是不正常的，且可能有害。
