The spatial relationship of the mandibular condyle to the temporal component of the TMJ is determined quantitatively from lateral tomograms using a new method of measuring specific areas of the joint space. Condyle position along the posteroanterior axis of the joint is expressed as a ratio of the posterior joint space area divided by the anterior joint space area (the P/A ratio). A description of the method, as used in a clinical evaluation of 50 asymptomatic TMJs, and a statistical evaluation of the method's reproducibility and accuracy are given. The method was found to have both high reproducibility and high accuracy.
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References
1.
Wilkie, N.O. ; Hurst, T.L.; and Mit-Chell , D.L.: Radiographic Comparisons of Condyle-fossa Relationships During Maxillomandibular Registrations Made by Different Methods, J Prosthet Dent32:529-533, 1974.
2.
ROKNI, A. and ISMAIL, Y.H.: Radiographic Comparative Study of Condylar Position in Centric Relation and Centric Occlusion, IADR Progr & Abst 57: No. 342, 1978. 3. WILLIAMSON, E.H.: Laminagraphic Study of Mandibular Condyle Position When Recording Centric Relation, J Prosthet Dent 39: 561-564, 1978.
3.
Weinberg, L.A. : Role of Condylar Position in TMJ Dysfunction-pain Syndrome, J Prosthet Dent41:636-643, 1979.
4.
Kundert, M.: Limits of Perceptibility of Condyle Displacements on Temporomandibular Joint Radiographs, J Oral Rehab6 :375-383, 1979.
5.
Lundberg, M. and Welander, U.: The Articular Cavity in the Temporomandibular Joint. A Comparison Between the Oblique-lateral and the Tomographic Image , Medicamundi15:27, 1970.
6.
Farrar, W.B. : Diagnosis and Treatment of Anterior Dislocation of the Articular Disc, NY J Dent41:348-351, 1971.
7.
WEINBERG, L.A.: Correlation of Temporomandibular Dysfunction with Radiographic Findings, J Prosthet Dent 28:519-539, 1972. 9. ROZENCWEIG, D.: Three-dimensional Study of the Temporomandibular Articulation, J Periodontal 96:348-356, 1975.
8.
Nanthaviroj, S.; Omnell, K.; Ran-Dow , K.; and Oberg, T.: Clicking and Temporary "Locking" in the Temporomandibular Joint, Dentomaxillofac Radiol5:33-38, 1976.
9.
Omnell, K. and Petersson, A.: Radiography of the Temporomandibular Joint Utilizing Oblique Lateral Transcranial Projections, Odont Revy27:77-92, 1976.
10.
Faivovich, G. and Omnell, K.: Axial Tomography of the Temporomandibular Joint Using Hypocycloidal Movement of the Tube and Film, Dentomaxillofac Radiol6 :7-16,1977.
11.
Rozencweig, D. and Martin, G.: Selective Tomography of the TMJ and the Myofascial Pain-dysfunction Syndrome, J Prosthet Dent40:67-74, 1978.
12.
Ricketts, R.M. : Variations of the Temporomandibular Joint as Revealed by Cephalometric Laminagraphy, Am J Orthod36 :877-898,1950.
13.
Madsen, B.: Normal Variations in Anatomy, Condylar Movements and Arthrosis Frequency of the Temporomandibular Joints, Acta Radiol Diag4:273-288, 1966.
14.
Weinberg, L.A. : An Evaluation of the Duplicability of Temporomandibular Joint Radiographs, J Prosthet Dent24:512-541, 1970.
15.
Weinberg, L.A. : What We Really See in a TMJ Radiograph, J Prosthet Dent30:898-913, 1973.
16.
Weinberg, L.A. : An Evaluation of Asymmetry in TMJ Radiographs , J Prosthet Dent40: 315-323, 1978.
17.
Lindblom, G. : On the Anatomy and Function of the Temporomandibular Joint, Acta Odont Scand17 (Suppl 28):127-130, 247, 1960.
18.
Winer, B.J.: Statistical Principles in Experimental Design, 2nd ed., New York: McGraw-Hill, Inc. , 1962, p. 261.
19.
Winer, B.J.: Statistical Principles in Experimental Design, 2nd ed., New York: McGraw-Hill, Inc. , 1962, p. 286.
