School of Dentistry, University of São Paulo.
J Forensic Odontostomatol. 2021 Apr 30;39(1):2-8.
To propose a formula for determining reduced mouth opening due to oral and maxillofacial trauma, based on the normal standard of the Brazilian population.
First, the maximum mouth opening was established, in millimeters, using a digital pachymeter, in patients between 22 and 60 years of age. The opening was measured from the upper to the lower incisor, at maximum amplitude, without pain and overbite. Second, the facial profile type and height were determined. A formula was developed to calculate the percentage of reduced mouth opening based on the normal average.
The average mouth opening was found to be 51.71 mm in men and 47.94 mm in women, thus establishing a statistically significant difference in mouth opening between sexes. However, there was no statistically significant difference between age and profile type with mouth opening. The following formulas were developed to calculate the reduced mouth opening, based on the averages found, by using RA= [100-(A.1.93)].0.3 for males and RA= [100-(A.2,08)] .0.3 for female patients.
Considering that mouth opening tends to be larger in men than in women, valid formulas can be used to determine the correct percentage of reduced mouth opening.
基于巴西人群的正常标准，提出一个用于确定口腔颌面部创伤所致张口度减小的公式。
首先，使用数字测厚仪确定 22 至 60 岁患者的最大张口度（以毫米为单位）。在无疼痛和覆颌的情况下，以上切牙至下切牙的最大幅度测量开口度。其次，确定面型类型和高度。根据正常平均值制定一个公式，计算张口度减小的百分比。
男性的平均张口度为 51.71 毫米，女性为 47.94 毫米，因此男女之间的张口度存在统计学显著差异。然而，张口度与年龄和面型之间没有统计学显著差异。根据平均值制定了以下公式，用于计算男性患者的张口度减小值 RA= [100-(A.1.93)].0.3，用于计算女性患者的张口度减小值 RA= [100-(A.2,08)].0.3。
考虑到男性的张口度通常大于女性，因此可以使用有效的公式来确定正确的张口度减小百分比。
