Ebadian Behnaz, Abolhasani Majid, Heidarpour Anahita, Ziaei Mohsen, Jowkar Mohammad
Dental Implants Research Center, Department of Prosthodontics, Dental Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
Dental Students' Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
J Indian Prosthodont Soc. 2020 Jan-Mar;20(1):76-82. doi: 10.4103/jips.jips_282_19. Epub 2020 Jan 27.
The narrowing of the mandible during opening and protrusion movements is defined as median mandibular flexure (MMF). MMF is caused by the attachment of mandibular muscles; therefore, it can be assumed that a greater amount of maximum occlusal force (MOF) may cause more flexion and could affect the survival of dental and implant restorations. The purpose of this study was to evaluate any relationship between MOF and MMF in a sample of adults.
In this descriptive, cross-sectional, nondirectional study, a sample of 90 volunteers were recruited (45 men and 45 women). MOF was measured by applying the strain gauge receptor to the first molar region, and MMF was measured by calculating the variation in the intermolar distance by a digital caliper with an accuracy of 0.01 mm using an impression and resulted in the stone cast during the maximum opening and closed-jaw positions. The body mass index (BMI) also was calculated.
Data were analyzed using the SPSS software (version 23) inferential and descriptive statistics, linear regression, and Pearson correlation coefficient. < 0.05 was considered statistically significant.
There was no statistically significant relationship between MOF and MMF ( = 0.78), but there was a significant association between MOF and BMI ( < 0.001, = 0.475) and gender.
Although MOF and MMF are both important and effective factors in the success of prosthetic restorations, one cannot be expected by the other and both should be considered in the treatment plan separately.
下颌在开口和前伸运动过程中的变窄被定义为下颌正中弯曲（MMF）。MMF是由下颌肌肉附着引起的；因此，可以假设更大的最大咬合力（MOF）可能会导致更多的弯曲，并可能影响牙齿和种植体修复体的存留。本研究的目的是评估成年样本中MOF与MMF之间的关系。
——比较研究。
在这项描述性、横断面、非定向研究中，招募了90名志愿者样本（45名男性和45名女性）。通过将应变片感受器应用于第一磨牙区域来测量MOF，通过使用精度为0.01mm的数字卡尺计算在最大开口和闭口位置时印模并制作成石膏模型后的磨牙间距离变化来测量MMF。还计算了体重指数（BMI）。
使用SPSS软件（版本23）进行数据的推断性和描述性统计、线性回归以及Pearson相关系数分析。P<0.05被认为具有统计学意义。
MOF与MMF之间无统计学显著关系（P=0.78），但MOF与BMI之间存在显著关联（P<0.001，r=0.475）以及与性别有关。
尽管MOF和MMF在修复体成功方面都是重要且有效的因素，但不能相互预测，在治疗计划中两者都应分别予以考虑。
