Orthodontic section, Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Thailand.
Department of Occlusion, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
J Oral Rehabil. 2022 Oct;49(10):980-992. doi: 10.1111/joor.13351. Epub 2022 Jul 3.
Anterior bite planes are bite-raising appliances used for deep bite correction. However, muscle responses to anterior bite planes of different harnesses may vary.
To prospectively evaluate masticatory muscle activity, muscle balance and maximum bite force (MBF) responses to anterior bite planes fabricated from acrylic resin (ABP) or bi-laminate thermoplastic (TBP) over 6 months in children with a deep bite.
Sixty-six children were randomly assigned to the ABP, TBP or untreated control groups. Masticatory muscle activity, activity index (AC) and percentage overlapping coefficient (POC) were assessed by surface electromyography; MBF, using a custom-made bite force sensor. Data were collected before, immediately after appliance insertion and after 2 weeks and 1, 3 and 6 months of treatment. Within- and between-group differences were analysed using the one-way ANOVA/Kruskal-Wallis and Mann-Whitney U tests (α = .05); Friedman's tests were used to assess within-group differences over time (α = .08).
At rest, no dependent variables changed throughout the study. At maximum clenching, masticatory muscle activity immediately dropped significantly but returned to baseline values and was equal to the control group at 1-3 months. The ABP group had significantly lower masseter activity and AC than the TBP group after insertion. Neither POC nor MBF were significantly different within or between groups.
Masticatory muscle activity reduced after anterior bite plane insertion but returned to baseline after 1-3 months. Masseter activity decreased significantly more in the ABP group than TBP group. Neither appliance significantly affected POC or MBF.
Thai Clinical Trial Registry (TCTR20210330002).
前牙合垫是用于深覆合矫正的上抬咬合装置。然而，不同基托的前牙合垫对上颌咀嚼肌的反应可能不同。
前瞻性评估深覆合儿童使用丙烯酸树脂（ABP）或双层面热塑（TBP）前牙合垫 6 个月后咀嚼肌活动、肌肉平衡和最大咬合力（MBF）的反应。
66 名儿童被随机分配到 ABP、TBP 或未治疗对照组。通过表面肌电图评估咀嚼肌活动、活动指数（AC）和重叠系数（POC）；使用定制的咬合力传感器测量 MBF。在佩戴前、佩戴后即刻以及佩戴后 2 周、1 个月、3 个月和 6 个月时收集数据。采用单因素方差分析/克鲁斯卡尔-沃利斯检验和曼-惠特尼 U 检验（α=0.05）分析组内和组间差异；采用 Friedman 检验评估组内随时间的差异（α=0.08）。
在休息状态下，所有依赖变量在整个研究过程中均无变化。在最大紧咬时，咀嚼肌活动立即显著下降，但在 1-3 个月时恢复到基线值并与对照组相等。插入后，ABP 组的咀嚼肌活动和 AC 明显低于 TBP 组。POC 和 MBF 在内组和组间均无显著差异。
前牙合垫插入后咀嚼肌活动减少，但在 1-3 个月后恢复到基线。ABP 组的咀嚼肌活动明显低于 TBP 组。两种装置均未显著影响 POC 或 MBF。
泰国临床试验注册中心（TCTR20210330002）。
