A retrospective comparison of functional appliance treatment of Class III malocclusions in the deciduous and mixed dentitions
A retrospective comparison of functional appliance treatment of Class III malocclusions in the deciduous and mixed dentitions
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DOI：
10.1093/ejo/20.3.309
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发表时间：
1998-06-01
影响因子：
2.6
通讯作者：
Tollaro, I
中科院分区：
文献类型：
--
作者：
Baccetti, T;Tollaro, I
本回顾性研究比较了20名平均年龄为5岁1个月± 7个月的III类错牙合患儿在乳牙期和替牙期使用下颌牵开器治疗的效果（乳牙列），而一组18名患有III类错牙合畸形的儿童在平均8岁2个月+/- 9个月（混合牙列）时开始治疗。第一组的平均观察期为2年3个月± 6个月，第二组为2年4个月± 7个月。匹配对照组的儿童未经治疗的III类错牙合在乳牙和混合牙列（16名受试者和15名受试者，分别）。头影测量分析是基于一个稳定的basicranial参考系统适用于纵向研究，开始在早期developmentages. Results结果表明，治疗III类错牙合在乳牙期产生了更显着的前向形态旋转的下颌骨，由于更向上和向前的方向髁状突生长（P < 0.01）。这导致早期治疗的III类错牙合患儿下颌骨总长度（Co-Pg）的增量显著较小（P < 0.01）。替牙期治疗的安氏Ⅲ类错牙合患者治疗后上颌牙槽突前伸的发生率明显高于替牙期治疗的患者（P < 0.01）。通过功能性矫治器改善III类错牙合患者骨骼关系的最佳时机似乎是在乳牙期。
This retrospective study compared the effectiveness of treatment of Class III malocclusions with the removable mandibular retractor in the deciduous and mixed dentitions.A group of 20 children with Class III malocclusions started treatment at a mean age of 5 years 1 month +/- 7 months (deciduous dentition), while a group of 18 children with Class III malocclusions started treatment at a mean age of 8 years 2 months +/- 9 months (mixed dentition). The mean observation period was 2 years 3 months +/- 6 months for the first group, and 2 years 4 months +/- 7 months for the second group. Matched control groups of children with untreated Class III malocclusions in the deciduous and in the mixed dentition (16 subjects and 15 subjects, respectively) were used. The cephalometric analysis was based on a stable basicranial reference system appropriate for longitudinal studies that begin at early developmental ages.The results showed that treatment of Class III malocclusions in the deciduous dentition produced a more significant anterior morphogenetic rotation of the mandible, due to a more upward and forward direction of condylar growth (P < 0.01). This leads to significantly smaller increments in mandibular total length (Co-Pg) in children with Class III malocclusions undergoing very early treatment (P < 0.01). On the contrary, maxillary dento-alveolar protrusion induced by therapy was greater in Class III subjects treated in the mixed dentition (P < 0.01). The optimum timing to improve skeletal relationships in Class III malocclusions by means of a functional appliance appears to be in the deciduous dentition.