Panoramic Radiograph and Computed Tomography Correlation for Dental Implant Planning: Part II - Clinical Study

Panoramic Radiograph and Computed Tomography Correlation for Dental Implant Planning: Part II - Clinical Study
M.A.G.S. SILVA1, R.F. RIBEIRO-ROTTA1, A.A. CARVALHO1, E.S. CARNEIRO1, C.A.B.C.M. NUNES1, L.M. NORMANHA2, S.H. OLIVEIRA2, and J.R.P. LAURIS3, 1 Universidade Federal De Goias, Goi?¢nia, Brazil, 2 Funda???£o Jos?© Normanha, Goi?¢nia, Brazil, 3 Bauru Dental School, University of S?£o Paulo, Brazil
2003
IADR
Objective: The aim of this study was to analyze and compare vertical, horizontal and transversal linear measurements obtained from panoramic radiographs and CT, and evaluate distortion degrees of both techniques, in a view of implantology diagnosis and planning. Methods: Twenty patients whose had first inferior molar region as proposed implant side were the sample of this study. Surgical/imaging stents containing metallic tubes were made to localize implant site, to be a reference to obtain the linear measurements, the degree of distortion of both imaging techniques and to guide the surgical placement of the implant. Pre and post operatory imaging were taken using panoramic and CT. Three previously trained examiners, according to a pre-established protocol, obtained the linear measurements. The student test were applied to compare the measurements obtained by the panoramic X-ray and CT. Results: The results showed that the mean of measurements from the alveolar crest to the mandibular base obtained by panoramic and CT were 25,55 mm (¨±3,94 mm) and 18,14 mm (¨±3,54 mm), respectively. The mean of measurements from the alveolar crest to the rough of the mandibular canal were 17,34 mm (¨±4,11 mm) by panoramic and 10,44 mm (¨±3,36 mm) by CT. The difference between the measurements obtained by the imaging techniques and the real implant size were the following: length = +3,04 mm (+26,34%) in the panoramic and +1,19 mm (+10,31%) in the CT; diameter = +0,57 mm (+13,73%) in the panoramic and +0,52% (+12,53%) in the CT. Conclusions: Based on the results we concluded that both imaging techniques used in this study provided informations different from the real ones. The measurements obtained by the panoramic images were higher the real measurements obtained by these methods should be considered as scope. Supported by CNPq / PIBIC/ Brazil.