Dijkstra P U, Hof A L, Stegenga B, de Bont L G
Department of Oral and Maxillofacial Surgery, University Hospital Groningen, The Netherlands.
J Oral Rehabil. 1999 Feb;26(2):117-22. doi: 10.1046/j.1365-2842.1999.00358.x.
Theoretically, mouth opening not only reflects the mobility of the temporomandibular joints (TMJs) but also the mandibular length. Clinically, the exact relationship between mouth opening, mandibular length, and mobility of TMJs is unclear. To study this relationship 91 healthy subjects, 59 women and 32 men (mean age 27.2 years, s.d. 7.5 years, range 13-56 years) were recruited from the patients of the Department of Oral and Maxillofacial Surgery of University Hospital, Groningen. Mouth opening, mobility of TMJs and mandibular length were measured. The mobility of TMJs was measured as the angular displacement of the mandible relative to the cranium, the angle of mouth opening (AMO). Mouth opening (MO) correlated significantly with mandibular length (ML) (r = 0.36) and AMO (r = 0.66). The regression equation MO = C1 x ML x AMO + C2, in which C = 0.53 and C2 = 25.2 mm, correlated well (r = 0.79) with mouth opening. It is concluded that mouth opening reflects both mobility of the TMJs and mandibular length.
从理论上讲，张口不仅反映颞下颌关节（TMJ）的活动度，还反映下颌长度。临床上，张口、下颌长度与颞下颌关节活动度之间的确切关系尚不清楚。为研究这种关系，从格罗宁根大学医院口腔颌面外科的患者中招募了91名健康受试者，其中59名女性和32名男性（平均年龄27.2岁，标准差7.5岁，年龄范围13 - 56岁）。测量了张口度、颞下颌关节活动度和下颌长度。颞下颌关节活动度通过测量下颌相对于颅骨的角位移，即张口角度（AMO）来确定。张口度（MO）与下颌长度（ML）显著相关（r = 0.36），与AMO也显著相关（r = 0.66）。回归方程MO = C1×ML×AMO + C2，其中C1 = 0.53，C2 = 25.2 mm，与张口度相关性良好（r = 0.79）。研究得出结论，张口度反映了颞下颌关节的活动度和下颌长度。
