天然牙列牙齿邻面接触强度的初步定量研究

A Preliminary Quantitative Study of the Proximal Contact Strength in Natural Dentition

目的:初步定量评估天然牙列中牙列整齐人群牙齿邻面接触强度(PCS)的大小。方法:2021年11月~2022年3月于南京大学招募牙列整齐的大学生43名(男生22名,女生21名),分别选取其上下颌牙列前、中、后段共10个位点(上下颌中切牙邻面、双侧尖牙和第一前磨牙邻面、第二前磨牙和第一磨牙邻面),采用数显推拉力计对上述10个位点的PCS进行测量,计算各测量位点的均数和标准差,进而分析各测量位点之间是否存在上下颌、前后向、左右侧以及性别的差异。结果:(1)上下颌前、中、后段位点间的平均PCS分别为:11/21:(0.86±0.52)N;31/41:(1.13±0.60)N;U3/U4:(1.86±0.79)N;L3/L4:(2.44±1.06)N;U5/U6:(2.44±0.98)N;L5/L6:(2.93±1.16)N;(2)下颌前、中、后段位点间PCS均大于上颌同名位点间PCS;(3)上下颌前中后段PCS逐渐增大;(4)上颌或下颌左右侧中、后段同名位点间PCS相比无统计学差异;(5)上颌或下颌前、中、后段位点间PCS无性别差异。结论:本研究首次对天然牙列中牙列整齐人群的牙齿邻面接触强度(PCS)进行统计分析,所得结果可为临床上正畸或修复重建牙列合适的邻面接触强度提供参考。

Objective:To quantitatively evaluate the size of proximal contact strength(PCS)in patients with neat teeth in natural dentition.Methods:Forty-three college students(22 males and 21 females)with natural dentition from Nanjing University were recruited during November 2021 to March 2022.A total of 10 sites(the proximal surfaces of upper and lower central incisors,bilateral canines and first premolars,and second premolars and first molars)were selected respectively.The PCS of above 10 sites were measured by digital display push-pull meter,and the mean and standard deviation of each measured site were calculated.Then,the differences between maxilla and mandible,anterior and posterior,left and right,and male and female were analyzed.Results:(1)The average PCS between anterior,middle,and posterior segments of maxilla and mandible were 11/21:(0.86±0.52)N;31/41:(1.13±0.60)N;U3/U4:(1.86±0.79)N;L3/L4:(2.44±1.06)N;U5/U6:(2.44±0.98)N;L5/L6:(2.93±1.16)N;(2)The PCS between anterior,middle,and posterior segments of the mandible were larger than those between the same sites in the maxilla.(3)The PCS in anterior,middle,and posterior segments increased gradually.(4)There was no statistical difference in PCS between the homonymic sites in the middle and posterior segments;(5)There was no gender difference between anterior,middle,and posterior segments.Conclusion:This study can provide reference for orthodontic or prosthodontic treatment to reconstruct appropriate proximal contact.