Abstract
Objectives
To investigate the effects of vertical projection angle alterations in intraoral radiography on the detection of furcation defects in the mandibular first molar, and to clarify the possible cause of variations in detectability.
Methods
Five bilateral first molars of dried mandibles were used as a furcation disease model. Simulated defects of different depths were created in a stepwise manner, and intraoral radiographs were taken using different vertical angles of the X-ray beam. A total of 858 radiographs were incorporated into the statistical analysis. The simulated defects were divided into four groups according to the depths acquired from cone-beam computed tomography examinations. The detectability of the extent of each loss of bone was calculated as the area under the curve using a receiver-operating characteristic analysis.
Results
Small defects were less detectable than larger defects, and the upper angle (20°) resulted in the best detectability. The detectability of larger defects was high throughout all the angles, with the exception of extremely low angles.
Conclusions
Diagnostic accuracy was affected by the vertical angle of the X-ray beam. An angle that avoids the cortical bone wall would improve the ability to detect and diagnose small defects.
Similar content being viewed by others
References
Perschbacher S. Periodontal diseases. In: White SC, Pharoah MJ, editors. Oral radiology, principles and interpretation. 6th ed. St. Louis: Mosby; 2009. p. 282–94.
Hirschfeld L, Wasserman B. A long-term survey of tooth loss in 600 treated periodontal patients. J Periodontol. 1978;49:225–37.
Muller H-P, Eger T. Furcation diagnosis. J Clin Periodontol. 1999;26:485–98.
Jenkins SM, Dummer PMH, Newcombe RG. Radiographic amelocemental junction and alveolar crest: effect of X-ray beam angulation. J Oral Rehabil. 1995;22:679–84.
Hausmann E, Allen K, Christersson L, Genco RJ. Effect of x-ray vertical angulation on radiographic alveolar crest level measurement. J Periodontal Res. 1989;24:8–19.
Guerrero ME, Jacobs E, Loubele M, Schutyser F, Suetens P, Steenberghe D. State-of-the-art on cone beam CT imaging for preoperative planning of implant placement. Clin Oral Invest. 2006;10:1–7.
Walter C, Weiger R, Zitmann NU. Accuracy of three-dimensional imaging in assessing maxillary molar furcation involvement. J Clin Periodontol. 2010;37:436–41.
Hishikawa T, Izumi M, Naitoh M, Furukawa M, Yoshinari N, Kawase H, et al. The effect of horizontal X-ray beam angulation on the detection of furcation defects of mandibular first molars in intraoral radiography. Dentomaxillofac Radiol. 2010;39:85–90.
Waerhaug J. The infrabony pocket and its relationship to trauma from occlusion and subgingival plaque. J Periodontol. 1979;50:355–65.
Gurgan C, Grondahl K, Wennstrom JL. Radiographic detectability of bone loss in the bifurcation of mandibular molars: an experimental study. Dentomaxillofac Radiol. 1994;23:143–8.
Hamp SE, Nyman S, Lindhe J. Periodontal treatment of multirooted teeth. Results after 5 years. J Clin Periodontol. 1975;2:126–35.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Hishikawa, T., Izumi, M., Naitoh, M. et al. Effects of the vertical projection angle in intraoral radiography on the detection of furcation involvement of the mandibular first molar. Oral Radiol 27, 102–107 (2011). https://doi.org/10.1007/s11282-011-0070-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11282-011-0070-0