The treatment change of PAR (peer assessment rating) index and cephalometric measurements in Class I malocclusion patients

Kim, Hyeon Hye; Lee, Ky Heon; Kim, Jong Chul

Abstract

The purpose of this study was to evaluate the relation between the treatment duration and cephalometric measurements and the PAR index in Class I malocclusion patients. In 100 Class I malocclusion patients, PAR score and cephalometric measurements were taken from study model and cephalometric radiographs and cephalmetric radiographs and analyzed statistically. The results of this study were obtained as follows: 1. Treatment duration was correlated with extraction and pre PAR index. 2.ANB, FMA,FMIA and IMPA exhibited positive correlation between pre PAR index and pretreatment cephalometric measurements. 3. 1 to FP exhibited positive correlation between post PAR index and posttreatment cephalometric measurements, and 1 to FP exhibited negative correlation. 4. 1 to SN, II A and 1 to FP exhibited positive correlation between % PAR reduction and the change of cephalometric measurements FMA, FMIA, WITS and UL, exhibited negative correlation. The results of this study indicate that PAR index taken from study model relate with items concerned with upper and lower incisors, and there are the tendency that pretreatment PAR index are larger in the patients with large ANB value and hyperdivergent face.