方形下颌患者下颌运动的特征

Characteristics of mandibular movements in patients with square mandible.

作者信息

Hirai Shinya, Ogawa Takumi, Shigeta Yuko, Ando Eriko, Hirabayashi Rio, Ikawa Tomoko, Kasama Shintaro, Fukushima Shunji, Matsuka Yosizo

机构信息

Department of Fixed Prosthodontics, Tsurumi University School of Dental Medicine, Tsurumi university, Yokohama, Japan.

出版信息

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009 Nov;108(5):e75-81. doi: 10.1016/j.tripleo.2009.07.008.

DOI:10.1016/j.tripleo.2009.07.008

PMID:19836717

Abstract

OBJECTIVE

The aim was to report the kinetics of masticatory muscles using a 4-dimensional muscle model and kinetically investigate the etiology of square mandible (SQM) in vivo.

STUDY DESIGN

To ascertain the mandibular movements in patients with SQM, we compared a group of 11 SQM patients with painless limited mouth opening to a matched group of 11 healthy volunteers who acted as control subjects. Mandibular movements were recorded using a 6-degrees-of-freedom jaw-tracking device, with the incisal and kinematic condylar as analytic points.

RESULTS

For the control group, mean tracking distance for the incisal point was 50.1 +/- 6.8 mm, whereas for the SQM group mean tracking distance was 27.1 +/- 2.8 mm. With lateral excursions, the control group's mean tracking distance of the incisal point was 9.9 +/- 2.01 mm, and the SQM group's was 8.1 +/- 1.64 mm.

CONCLUSION

Despite a sufficient lateral excursion, motion of the mandible was limited by some factors at opening and suggests that the mode of lateral movements in SQM patients may differ slightly from those in healthy individuals.

摘要