Abstract：
OBJECTIVE: To investigate the relationship between oral muscle pressure and malocclusion in the mixed dentition.
METHODS: Maximum tongue, lip and cheek pressure was measured using the Iowa Oral Performance Instrument (IOPI) in 3 patient cohorts: patients with (1) posterior crossbite, (2) class II relationship and (3) a control group of patients without malocclusion. Linear models were used to compare the mean differences in muscle pressure between groups, with correction for age and gender. The imbalance between lips and tongue and between lips and cheeks was calculated by the Delta z-scores of each group.
RESULTS: A total of 146 participants were included, 46 (mean age 8.71±0.85), 41 (mean age 11.74±1.17) and 35 (mean age 10.71±1.92) in groups 1, 2 and 3 respectively. Patients with malocclusion showed significantly higher lip and lower cheek pressure and imbalance favouring the lips over the tongue compared to controls. Class II,1 patients showed significantly higher tongue pressure than Class II,2. No differences were found in muscle pressure or imbalance between crossbite and Class II nor between crossbite types.
CONCLUSIONS: These findings suggest that oral muscle pressure may be associated with malocclusion. This highlights the importance of functional diagnosis and its implications on the prevention and treatment of malocclusion, as well as on orthodontic stability.
METHODS: Maximum tongue, lip and cheek pressure was measured using the Iowa Oral Performance Instrument (IOPI) in 3 patient cohorts: patients with (1) posterior crossbite, (2) class II relationship and (3) a control group of patients without malocclusion. Linear models were used to compare the mean differences in muscle pressure between groups, with correction for age and gender. The imbalance between lips and tongue and between lips and cheeks was calculated by the Delta z-scores of each group.
RESULTS: A total of 146 participants were included, 46 (mean age 8.71±0.85), 41 (mean age 11.74±1.17) and 35 (mean age 10.71±1.92) in groups 1, 2 and 3 respectively. Patients with malocclusion showed significantly higher lip and lower cheek pressure and imbalance favouring the lips over the tongue compared to controls. Class II,1 patients showed significantly higher tongue pressure than Class II,2. No differences were found in muscle pressure or imbalance between crossbite and Class II nor between crossbite types.
CONCLUSIONS: These findings suggest that oral muscle pressure may be associated with malocclusion. This highlights the importance of functional diagnosis and its implications on the prevention and treatment of malocclusion, as well as on orthodontic stability.
摘要：
目的：探讨口腔肌压与牙列错牙合的关系。
方法：最大舌头，使用Iowa口腔性能仪器（IOPI）在3个患者组中测量嘴唇和脸颊压力：（1）后牙合，(2)Ⅱ类关系与(3)对照组患者无错牙合关系。线性模型用于比较组间肌肉压力的平均差异，校正年龄和性别。嘴唇和舌头之间以及嘴唇和脸颊之间的不平衡是通过每组的Deltaz分数来计算的。
结果：共纳入146名参与者，46（平均年龄8.71±0.85），第1、2和3组分别为41岁(平均年龄11.74±1.17)和35岁(平均年龄10.71±1.92)。与对照组相比，错牙合畸形的患者表现出明显较高的嘴唇和较低的脸颊压力，并且不平衡有利于嘴唇而不是舌头。二级,1例患者舌压明显高于Ⅱ类,2.交叉咬合与II类之间以及交叉咬合类型之间的肌肉压力或不平衡均未发现差异。
结论：这些发现提示口腔肌肉压力可能与咬合不正有关。这突出了功能诊断的重要性及其对预防和治疗错牙合的意义，以及正畸的稳定性。
方法：最大舌头，使用Iowa口腔性能仪器（IOPI）在3个患者组中测量嘴唇和脸颊压力：（1）后牙合，(2)Ⅱ类关系与(3)对照组患者无错牙合关系。线性模型用于比较组间肌肉压力的平均差异，校正年龄和性别。嘴唇和舌头之间以及嘴唇和脸颊之间的不平衡是通过每组的Deltaz分数来计算的。
结果：共纳入146名参与者，46（平均年龄8.71±0.85），第1、2和3组分别为41岁(平均年龄11.74±1.17)和35岁(平均年龄10.71±1.92)。与对照组相比，错牙合畸形的患者表现出明显较高的嘴唇和较低的脸颊压力，并且不平衡有利于嘴唇而不是舌头。二级,1例患者舌压明显高于Ⅱ类,2.交叉咬合与II类之间以及交叉咬合类型之间的肌肉压力或不平衡均未发现差异。
结论：这些发现提示口腔肌肉压力可能与咬合不正有关。这突出了功能诊断的重要性及其对预防和治疗错牙合的意义，以及正畸的稳定性。
