Righetti Mariah Acioli, Taube Oswaldo Luiz Stamato, Palinkas Marcelo, Gonçalves Lígia Maria Napolitano, Esposto Danilo Stefani, de Mello Edneia Corrêa, Regalo Isabela Hallak, Regalo Simone Cecilio Hallak, Siéssere Selma
School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
UNIFAFIBE University Center, Bebedouro, São Paulo, Brazil.
Prague Med Rep. 2020;121(2):87-95. doi: 10.14712/23362936.2020.7.
Osteoarthrosis is a disorder of synovial joints, resulting from destruction of the cartilage and subchondral bone. The present study is aimed to investigate the molar bite force, thickness and efficiency of the masseter and temporalis muscles of subjects with osteoarthrosis. A total of forty-eight subjects participated in the study. They were distributed into two groups: with osteoarthrosis (n=24) and asymptomatic controls (n=24). Subjects were analyzed on the basis of maximal molar bite force (right and left side), thickness (mandibular rest and dental clenching in maximal voluntary contraction) and electromyographic activity of masticatory cycles through the linear envelope integral in habitual (raisins and peanuts) and non-habitual (Parafilm M) chewing of the masseter and temporalis muscles. All the data were analyzed statistically using t-test with a significance level of p≤0.05. There was no difference between groups in maximal molar bite force, muscle thickness and non-habitual chewing. Differences were found on the raisins (p=0.02) and peanuts (p=0.05) chewing for right temporal muscle, with reduced masticatory muscle efficiency in osteoarthrosis subjects. This study showed that osteoarthrosis induces negative changes in habitual chewing, highlighting the efficiency of the right temporalis muscles. The greater temporal muscle activity in subjects with osteoarthrosis may compromise chewing and consequently the nutritional status of adult subjects.
骨关节炎是一种滑膜关节疾病，由软骨和软骨下骨的破坏引起。本研究旨在调查骨关节炎患者的磨牙咬合力、咬肌和颞肌的厚度及效能。共有48名受试者参与了该研究。他们被分为两组：骨关节炎组（n = 24）和无症状对照组（n = 24）。基于最大磨牙咬合力（右侧和左侧）、厚度（下颌休息位及最大自主收缩时紧咬牙齿时）以及通过咬肌和颞肌在习惯性（葡萄干和花生）及非习惯性（Parafilm M）咀嚼时的咀嚼周期线性包络积分来分析受试者的肌电图活动。所有数据均采用t检验进行统计学分析，显著性水平为p≤0.05。两组在最大磨牙咬合力、肌肉厚度和非习惯性咀嚼方面无差异。在咀嚼葡萄干（p = 0.02）和花生（p = 0.05）时，右侧颞肌存在差异，骨关节炎受试者的咀嚼肌效能降低。本研究表明，骨关节炎会导致习惯性咀嚼出现负面变化，突出了右侧颞肌的效能。骨关节炎患者颞肌活动增强可能会影响咀嚼，进而影响成年患者的营养状况。
