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Year : 2009  |  Volume : 9  |  Issue : 2  |  Page : 84-87

Electronic survey: An in-vitro study on reliability of the technique

Department of Prosthodontics, V S Dental College and Hospital, Bangalore, India

Correspondence Address:
P Rohit
#20/2, Sougandika Nilaya. 8th main, M.C.Binny layout, Vijayanagar, Bangalore - 560 040
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-4052.55250

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Aim: The main purpose of this study is to determine the dimensional accuracy of digital models as compared to that of study models and the reliability of electronic surveying. The study aims to measure and compare distances between selected landmarks on study models and digital models, angles of cervical convergence and undercut depth at predetermined points on the abutment teeth. Material and Methods: The study used partially edentulous study models of each of Kennedy's class I, II and III classifications. All the three models were scanned using multislice helical computerized tomography (CT) scan and digitized on the computer. The physical model and digitized models were surveyed and measured using various parameters and study designs. Measurements were conducted directly on study models and computer models using Altair Hyper mesh network version 7.0. The differences between the two sets of measurement were statistically analyzed using a suitable method. (t- Test). Results: The differences between measurement of distance on study models and digital models were found to be within the precision of 0.17mm, 0.08, o for the angle of cervical convergence and precision of 0.04mm for undercut depth of the abutment teeth. All these measurements were statistically slightly significant and well within the range of intraoperator variations. Conclusion: This study shows that dental cast can be scanned with the help of an accurate and sophisticated scanner and the scanned data can be transferred to the computer and used for the purpose of digital or electronic surveying.

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