Comparison of duration between manual and digital measurement of peer assessment rating (PAR) index in a system based on 2d image

In orthodontics, the malalignment of teeth could be measured using many types of indexes. The Peer Assessment Rating (PAR) Index is one of the most common indexes in Orthodontics which has a 98% validity, especially from the occlusal surface. Many researchers use a PAR ruler to measure the PAR Index manually. The aim of this study is to compare the duration between the manual and digital measurement of PAR index in a system based on the 2-dimensional (2D) image. Materials & methods: The 110 dental casts in octagonal base form pre-orthodontic treatment were scanned to get the digital image data. Eleven components of PAR index of 110 dental casts in octagonal base form pre-orthodontic treatment were calculated manually and digitally. Both of duration were compared with the paired t-test. Result: The time consuming of manual measurement was 378.01 seconds and digital was 177.05 seconds. The paired t-test comparing to systems were significant (p=0.001). The average difference of 3 PAR index scores in assessing the same study model, that shows Digital is more thorough at 3 PAR parity score. Discussion: The paired T-test has been performed to the 11 PAR index component. A digital measurement of 11 PAR component is reliable and faster than using a measurement manually by model studies. The 2D image is clearer so that point determination is easier hence the measurement time is faster. Conclusions: It is a solution and recommended for the orthodontist to consider of using PARIndex system as one of the alternative tools to have a faster PAR index measurement. Clinical article (J Int Dent Med Res 2017; 10(Special Issue): pp. 673-676)