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Evaluation of the usefulness of the limited cone-beam CT (3DX) in the assessment of the thickness of the roof of the glenoid fossa of the temporomandibular joint

¹ Department of Radiology, Nihon University School of Dentistry, Tokyo, Japan; ² Department of Oral Radiology, Matsumoto Dental University, Matsumoto, Japan

*Correspondence to: Kazuya Honda, Department of Radiology, Nihon University School of Dentistry, 1-8-13 kanda Surugadai Chiyoda-ku Tokyo, 101-8310 Japan; Email: honda-k{at}dent.nihon-u.ac.jp

Received 25 April 2004; revised 13 September 2004; accepted 3 October 2004

Objectives: The purpose of this study was to evaluate the usefulness of the limited cone-beam X-ray CT (3DX) (Morita Co., Japan) in measuring the thickness of the roof of the glenoid fossa (RGF) of the temporomandibular joint (TMJ).

Material and methods: Twenty-one TMJs removed at autopsy from 21 cadavers were investigated macroscopically using dissection and 3DX imaging. A Digimatic Outside Micrometer and a 3DX-image tool were used to measure the minimum thickness of the RGF. Multiple measurements were made to identify the thinnest area. Once the thinnest areas had been identified, three linear measurements were made and the average value was used for statistical analysis.

Results: The average macroscopic examination measurement was 1.37 mm (range 0.55–3.6 mm) and the average 3DX image measurement was 1.22 mm (range: 0.51–3.0 mm). There was no significant difference between these two groups using the Mann-Whitney U-test (P<0.05). The Spearman's correlation coefficient by rank between these two groups was r=0.93(P<0.001).

Conclusion: These results suggest that bone thickness measurements of the RGF by 3DX imaging was effective.

Keywords: roof of glenoid fossa; limited cone beam X-ray CT; autopsy specimens

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