Authors : Dr. Prasad Chitraa, , Dr. Ashwin Prakashb
DOI : 10.18231/j.jco.2017.007
Volume : 1
Issue : 1
Year : 2017
Page No : 46-51
Aim: To present simple photogrammetric techniques that can objectively evaluate standardized digital extraoral and intra-oral photographs for diagnostic and therapeutic purposes.
Materials and methods: 11 measurements (9 linear and 2 angular) from standardized lateral photographs were compared with analogous measurements from standardized lateral cephalograms. The study was conducted on 60 subjects (n=60, 41 females, 19 males) aged 18-25 years.8 photogrammetric techniques on standardized photographs, linear and angular photogrammetric analysis on lateral photographs, linear photogrammetric analysis on frontal and frontal smile photographs, photogrammetric analysis of occlusal cant, photogrammetric smile analysis and tooth and intra-arch measurements on occlusal photographs are described.
Results: All 11 parameters that were analyzed showed strong correlation. The intraclass correlation coefficients (ICC) and corresponding 95% confidence intervals (CI) of all parameters showed that the reliability of the photographic technique was excellent.
Conclusions: Photogrammetry on standardized photographs used in daily orthodontic practice offers a simple, cost effective solution without the hazard of radiation exposure. The 8 photogrammetric techniques described here show that photogrammetry has multiple applications. However, there is a need to standardize photogrammetric techniques, develop multiple photogrammetric analyses for different needs and obtain mean
values for parameters from different populations.
Keywords: Occlusal, photogrammetry, smile analysis, reliability