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Influence of scan mode (180°/360°) of the cone beam computed tomography for preoperative dental implant measurements
Author(s) -
Neves Frederico S.,
Vasconcelos Taruska V.,
Campos Paulo S. F.,
HaiterNeto Francisco,
Freitas Deborah Q.
Publication year - 2014
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/clr.12080
Subject(s) - wilcoxon signed rank test , cone beam computed tomography , intraclass correlation , reproducibility , implant , premolar , molar , medicine , standard deviation , dentistry , gold standard (test) , nuclear medicine , dental implant , friedman test , orthodontics , computed tomography , mathematics , radiology , surgery , mann–whitney u test , statistics , statistical hypothesis testing
Abstract Objective The aim of this study was to evaluate the effect of scan mode of the cone beam computed tomography ( CBCT ) in the preoperative dental implant measurements. Material and methods Completely edentulous mandibles with entirely resorbed alveolar processes were selected for this study. Five regions were selected (incisor, canine, premolar, first molar, and second molar). The mandibles were scanned with Next Generation i‐ CAT CBCT unit (Imaging Sciences International, Inc, Hatfield, PA , USA ) with half (180°) and full (360°) mode. Two oral radiologists performed vertical measurements in all selected regions; the measurements of half of the sample were repeated within an interval of 30 days. The mandibles were sectioned using an electrical saw in all evaluated regions to obtain the gold standard. The intraclass correlation coefficient was calculated for the intra‐ and interobserver agreement. Descriptive statistics were calculated as mean, median, and standard deviation. Wilcoxon signed rank test was used to determine the correlation between the measurements obtained in different scan mode with the gold standard. The significance level was 5%. Results The values of intra‐ and interobserver reproducibility indicated a strong agreement. In the dental implant measurements, except the bone height of the second molar region in full scan mode ( P = 0.02), the Wilcoxon signed rank test did not show statistical significant difference with the gold standard ( P > 0.05). Conclusions Both modes provided real measures, necessary when performing implant planning; however, half scan mode uses smaller doses, following the principle of effectiveness. We believe that this method should be used because of the best dose–effect relationship and offer less risk to the patient.