Hidaka Osamu, Adachi Satoshi, Takada Kenji
Department of Orthodontics, Osaka University Dental Hospital, Suita, Japan.
Angle Orthod. 2002 Aug;72(4):295-301. doi: 10.1043/0003-3219(2002)072<0295:TDICPB>2.0.CO;2.
This study investigates the differences in condylar position between centric relation (CR) and centric occlusion (CO) in Japanese orthodontic patients before treatment. We employed 150 consecutive cases (age range: 6-57 years) for the study. Dental casts were mounted on a Panadent articulator with a power centric CR bite record. The differences in condylar position between CR and CO in all three spatial planes were measured using the Panadent Condyle Position Indicator (CPI). The subjects were divided into groups by age, gender, mandibular plane angle or angle classification. No significant differences in the magnitude of CPI measurements were found among the groups. The three-dimensional distances of condylar displacement on both sides were almost identical, and the superoinferior displacement (S-I) was greater (P < .0001) than the anteroposterior displacement (A-P). The S-I was greater (P = .02) on the left side than on the right side, while the A-P displacement was smaller (P < .0001) on the left side than that on the right side. Significant condylar displacement (2.0 mm for S-I and A-P, 0.5 mm for the lateral displacement, L) was found frequently in L (31.3%), S-I, and A-P, in that order. Fifty-eight (38.7%) of the subjects had significant displacement in L, S-I, or A-P. Moreover, Angle Class III subjects tended to have significant condylar displacement toward the left side. The results suggest that orthodontists should be aware of a high incidence of condylar displacement in Japanese orthodontic patients and measure condylar displacement before the start of comprehensive orthodontic treatment to unmask real jaw relationships and avoid possible misdiagnoses.
本研究调查了日本正畸患者治疗前正中关系（CR）与正中咬合（CO）之间髁突位置的差异。我们采用了150例连续病例（年龄范围：6 - 57岁）进行研究。将牙模安装在带有动力正中CR咬合记录的Panadent咬合架上。使用Panadent髁突位置指示器（CPI）测量所有三个空间平面上CR和CO之间髁突位置的差异。根据年龄、性别、下颌平面角或Angle分类将受试者分组。各分组之间CPI测量值的大小没有显著差异。两侧髁突位移的三维距离几乎相同，上下位移（S - I）大于前后位移（A - P）（P <.0001）。左侧的S - I大于右侧（P = 0.02），而左侧的A - P位移小于右侧（P <.0001）。在L（31.3%）、S - I和A - P中，经常发现明显的髁突位移（S - I和A - P为2.0 mm，侧向位移L为0.5 mm），顺序依次如此。58名（38.7%）受试者在L、S - I或A - P中有明显位移。此外，Angle III类受试者倾向于向左侧有明显的髁突位移。结果表明，正畸医生应意识到日本正畸患者中髁突位移的高发生率，并在开始全面正畸治疗前测量髁突位移，以揭示真实的颌骨关系并避免可能的误诊。
