Tonni Ingrid, Pregarz Massimo, Ciampalini Giulio, Costantinides Fulvia, Bodin Christiane
Dental School, University of Brescia, Piazzale Spedali Civili 1, 25123 Brescia, Italy.
Pederzoli Hospital, Radiology Department, Via Monte Baldo 24, 37019 Peschiera del Garda, Italy.
ISRN Radiol. 2013 Sep 5;2013:932805. doi: 10.5402/2013/932805. eCollection 2013.
Aim. To determine whether a relationship exists between the linear measurements of overjet and overbite and the interincisal space delimited by the morphology of the upper and lower incisors. Method and Materials. 30 subjects (age range from 14.1 to 34.8 years, with a median age of 23.5 years and sex ratio F/M: 5/10) with overjet and overbite equal to 2 mm were selected from a group of 381 individuals with a full and well-aligned dentition, no previous dental treatment, and no signs or symptoms indicative of temporomandibular disorder. Computed Tomography images of vinyl polysiloxane impressions of the 30 subjects' anterior teeth were acquired. The interincisal space was defined as Immediate Overjet Angle and was calculated on the Computed Tomography images. Results. Although the 30 subjects presented overlapping measures of overjet and overbite, the values of the Immediate Overjet Angles were different in a range of a minimum value of 12° and a maximum value of 54°. Conclusion. This study reveals that (1) only 30 (7.9%) of the 381 individuals considered have values of overjet and overbite equal to 2 mm and (2) the Immediate Overjet Angle values of the 30 subjects are not related to the values of overjet and overbite.
目的。确定覆盖和覆合的线性测量值与上下切牙形态所界定的切牙间间隙之间是否存在关系。方法和材料。从381名牙列完整、排列整齐、未曾接受过牙科治疗且无颞下颌关节紊乱迹象或症状的个体中，选取30名覆盖和覆合均等于2毫米的受试者（年龄范围为14.1至34.8岁，中位年龄为23.5岁，性别比F/M：5/10）。获取了这30名受试者前牙的乙烯基聚硅氧烷印模的计算机断层扫描图像。切牙间间隙被定义为即时覆盖角，并在计算机断层扫描图像上进行计算。结果。尽管这30名受试者的覆盖和覆合测量值存在重叠，但即时覆盖角的值在最小值12°至最大值54°的范围内有所不同。结论。本研究表明：（1）在381名被考虑的个体中，只有30名（7.9%）的覆盖和覆合值等于2毫米；（2）这30名受试者的即时覆盖角值与覆盖和覆合值无关。
