Evaluation of the Bite Forces in Patients with Unilateral Temporomandibular Disorders

편측성 측두하악장애 환자의 교합력 평가

  • Lee, Woo-Jung (Department of Oral Medicine, Dankook University School of Dentistry) ;
  • Kim, Mee-Eun (Department of Oral Medicine, Dankook University School of Dentistry) ;
  • Kim, Ki-Suk (Department of Oral Medicine, Dankook University School of Dentistry)
  • 이우정 (단국대학교 치과대학 구강내과학교실) ;
  • 김미은 (단국대학교 치과대학 구강내과학교실) ;
  • 김기석 (단국대학교 치과대학 구강내과학교실)
  • Published : 2006.12.30


Most patients suffering from TMD appear to have unsatisfactory masticatory function and compromised values of bite force. The purposes of this study were to investigate and compare bite force between affected and unaffected sides of patients with unilateral TMD and to evaluate its relation with duration of TMD. 42 patients with unilateral TMD, from Department of Oral Medicine, Dankook University Dental Hospital, were selected for this study. The ratio of men to women was 9:33 and their mean age of $27.2{\pm}10.4$ years. The bite forces were measured over both canines (for anterior bite force) and $1^{st}$ molars (for posterior bite force) using a bite force recorder while all the subjects were asked to clench successively for 3 seconds not until pain was felt. They were compared with those measured from bilateral TMD patients(N=6, M:F=1:5, mean age: $23.0{\pm}27.3$ years). The unilateral TMD patients were divided into time groups according to duration of TMD on the basis of 1 and 6 months, respectively. Paired and unpaired t-tests were used for statistical analysis. Unilateral TMD patients in this study showed that the affected sides had significantly lower bite force than the unaffected sides(force difference of about 7-8 kgf, p<0.05) while there was no significant sides difference in the bilateral patients. Nor did bite force on the affected sides reveal significant difference between unilateral and bilateral TMD patients. With regards to TMD duration, there was significant difference between the patients with TMD < 6 months and $\geq$ 6 months (p<0.05) while no significant difference existed between < 1 month and $\geq$ 1 month. The results of this study indicated that unilateral TMD patients can exhibit more reduced bite force on the affected sides compared with that on the unaffected sides and that bite force on the unaffected sides might be deteriorated more as longer did TMD last.


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