Author :
Balaji Krishnan, Vengatakrishnan, Rajesh Raman, Kalaiselvi Ravi, Bharath Kumar Asokan, Raghul Gunasekaran
Volume :
5
Issue :
1
Abstract :
Introduction: Orthodontic diagnosis is the key factor in establishing the goals of successful treatment. Digital technology has vastly integrated, with the ultimate aim of a “paperless” orthodontic office. At present, virtual computerized models are available for performing all required measurements.Objective:(i) The purpose of this study was to evaluate diagnostic accuracy and measurement sensitivity of manual and digital measurements of pre-treatment plaster models of orthodontic patients. (ii) Inter-rater reliability between manual and digital measurements of pre-treatment plaster study models of orthodontic patient.
Materials and method: 30 study models with permanent dentition were selected and scanned using 3Shape
scanner. Manual measurements were made using four different methods 1) Vernier calliper (manual), 2) Digital vernier calliper, 3) divider and 4) Digital scanning. Digital scanning was made using EXOCAD dental software. 11 variables included were maxillary and mandibular inter - canine width, inter-premolar, inter-molar width,overjet,overbite,maxillary and mandibular arch perimeter and palatal height.Statistical analysis was done by using SPSS softwa re version 16.0.
Result: In mean and standard deviation between the four methods of measurement in maxillary and mandibular variables, onlyoverjet(7.3 ± 3.9)in digital scanning and arch perimeter (86.8 ± 9.8 and 55.8 ± 5.0) in digital vernier calliper by observer 1 differed much from other methods of measurement.
Conclusion: The digital model and manual model measurements had measurement sensitivity in most of the variables. The manual methods of measurement in pre - treatment models had more accuracy than the digital models.There was good correlation
between the observers in most of the measurements.