Pinto N, Woods M, Crawford E
University of Melbourne, Australia.
Aust Orthod J. 2000 Nov;16(3):127-32.
The occlusions of sixty patients treated by one experienced orthodontist were assessed using the PAR Index. For each patient, pretreatment, post-treatment and long-term follow-up study casts were examined. Follow-up casts were taken at least 6.5 years following the removal of all retention appliances. Following pretreatment cephalometric analysis, the patient sample was divided into three vertical facial subgroups according to the Jarabak Facial Height Quotient. Mean weighted PAR scores were then calculated at each stage for the total sample and for the three subgroups. Mean absolute and percentage occlusal changes were also calculated for the post-treatment period. The relationship between post-treatment occlusal change and pretreatment vertical facial pattern was then studied. The mean weighted pretreatment, post-treatment and follow-up PAR scores were 27.3, 3.3 and 8.0, respectively. The mean-absolute and percentage post-treatment increases in weighted PAR score were 4.7 and 25.4, respectively. No statistically-significant relationship could be found between the pretreatment vertical facial pattern and changes occurring in the weighted PAR score during the follow-up period. It was concluded, therefore, that pretreatment vertical facial pattern, at least on its own, is not likely to be predictive of the amount of post-treatment occlusal change.
一位经验丰富的正畸医生使用PAR指数对60例患者的咬合情况进行了评估。对于每位患者，均检查了治疗前、治疗后及长期随访研究模型。随访模型在拆除所有保持器后至少6.5年采集。在进行治疗前的头影测量分析后，根据贾拉巴克面部高度商数将患者样本分为三个垂直面部亚组。然后计算了总样本和三个亚组在每个阶段的平均加权PAR分数。还计算了治疗后阶段的平均绝对和百分比咬合变化。随后研究了治疗后咬合变化与治疗前垂直面部模式之间的关系。治疗前、治疗后和随访的平均加权PAR分数分别为27.3、3.3和8.0。治疗后加权PAR分数的平均绝对增加和百分比增加分别为4.7和25.4。在随访期间，治疗前垂直面部模式与加权PAR分数的变化之间未发现统计学上的显著关系。因此得出结论，治疗前垂直面部模式至少单独来看，不太可能预测治疗后咬合变化的量。
