Unit of Oral Rehabilitation, Department of Dental Medicine, Division of Oral Diagnostics and Rehabilitation, Karolinska Institutet, Stockholm, Sweden.
SCON, Scandinavian Center for Orofacial Neurosciences, Huddinge, Sweden.
Eur J Oral Sci. 2020 Aug;128(4):299-307. doi: 10.1111/eos.12721. Epub 2020 Aug 4.
To investigate age-related changes in oral motor strategies in response to unpredictable load demands. Sixty-five healthy children (aged 3-17 yr) were divided into five age-groups based on their dental eruption stages and compared with a group of healthy adults (aged 18-35 yr). Each participant was asked to perform a standardized motor control task involving 'pulling' and 'holding' a force transducer with the anterior teeth. Different loads were attached to the force transducer in an unpredictable manner. The temporal force profile was divided into two time-segments (an initial segment and a later segment). The peak force and peak force rate during the initial time-segment, and the holding force and intra-trial variability (coefficient of variation) during the later time-segment, were measured. The results showed no differences in the peak force, peak force rate, holding force, and force variability in children compared with adults. However, the trends in the data evaluated using a segmented regression analysis showed that a breakpoint (abrupt change) consistently occurred in the late-mixed dentition group (age 9-11 yr) for most of the outcome variables. The results indicate that while the motor control strategies in children appear to be similar to those in adults, there is a shift in the oral motor developmental trend during the late-mixed dentition stage.
为了研究在应对不可预测的负载需求时，口腔运动策略随年龄变化的情况。将 65 名健康儿童（年龄 3-17 岁）根据牙齿萌出阶段分为五个年龄组，并与一组健康成年人（年龄 18-35 岁）进行比较。要求每位参与者用前牙拉动和固定一个力传感器，完成一项标准化的运动控制任务。以不可预测的方式向力传感器附加不同的负载。将时间力曲线分为两个时间段（初始段和后续段）。测量初始段的峰值力和峰值力速率，以及后续段的保持力和试验内变异性（变异系数）。结果显示，与成年人相比，儿童的峰值力、峰值力速率、保持力和力变异性没有差异。然而，使用分段回归分析评估数据的趋势表明，大多数结果变量在混合牙列晚期（9-11 岁）组中存在一个拐点（突然变化）。结果表明，尽管儿童的运动控制策略似乎与成年人相似，但在混合牙列后期，口腔运动发育趋势发生了变化。
