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J A Guay

Publications and source records attributed to J A Guay.

5 recordsLinked to original sources
PubMed1994

Radiographic assessment of asymmetry of the mandible.

PURPOSE: To assess the relationship between mandibular asymmetry and disorders of the temporomandibular joint. METHODS: We used advanced imaging of the temporomandibular joint to distinguish different causes of mandibular asymmetry. MR imaging and arthrography were applied to the temporomandibular joints of 11 patients presenting with mandibular asymmetry. RESULTS: Condyle hyperplasia was identified as the cause of the asymmetry in 5 patients. In the other 6 patients the mandibular condyle was normal on the long side, but the short side of the face demonstrated a small condyle head, short condyle neck associated with disk displacement, internal derangement, and degenerative joint disease of the temporomandibular joint. CONCLUSIONS: These observations suggest that both condyle hyperplasia on the long side of the mandible and disk displacement and degenerative joint disease of the temporomandibular joint on the short side can cause mandibular asymmetry. It was concluded that MR imaging or arthrography can be valuable for understanding the cause of mandibular asymmetry and be effective in treatment planning.

Adult↗
PubMed1991

Angular and linear comparisons with unilateral mandibular asymmetry.

Twelve patients (mean age 24 years) presenting with facial asymmetry, thought to represent unilateral mandibular condylar hyperplasia, were included in this study. Two distinct patient groups were noted: (1) with apparent condylar hyperplasia and (2) with unilateral internal derangements. Six patients were found to have normal TMJs bilaterally and six had unilateral internal derangement occurring on the short side. Angular and linear measurements were compared using Student's t test for discrete variables between the two groups and ANOVA for continuous variables; however, they were unable to demonstrate any set of circumstances that would suggest differences between the two groups. The only clear distinction was the presence of degenerative joint disease on the short side. This suggests that standard radiographs would be helpful if other imaging studies were not performed.

Adolescent↗
PubMed1988

Bilateral internal derangements of temporomandibular joint: evaluation by magnetic resonance imaging.

Two hundred eleven patients with signs and symptoms of temporomandibular joint (TMJ) internal derangements were referred for magnetic resonance imaging. Both TMJs of each patient were routinely evaluated in this prospective investigation. With 422 joints examined, 29% (61) of the patients had bilaterally normal findings, 21% (45) of the patients had one normal side and one abnormal side, and 50% (105) of the patients showed bilateral internal derangements. This clinical study demonstrated a high likelihood of bilateral internal derangements in patients with symptoms of TMJ internal derangements.

Adolescent↗
PubMedDate not supplied

Radiographic assessment of temporomandibular joint pain and dysfunction in the pediatric age-group.

During a five-year period, a total of 150 patients (131 girls and 19 boys) with an average age of 14 years (range 7-16 years), with signs and symptoms of temporomandibular joint dysfunction were referred for imaging in the diagnostic radiology department. These patients were evaluated by multidirectional tomography to both joints, arthrography, computed tomography (CT), or magnetic resonance (MR) of one or both joints. Fifty-six (37 percent) of the 150 patients had plain tomographic, CT or MR evidence of degenerative arthritis of one or both sides (18/150 12 percent with bilateral degenerative joint disease). Internal derangements of the TMJ related to meniscal displacements and dysfunction were detected in 128 patients (85 percent). Twenty-nine patients (29/150: 20 percent) suffered from bilateral internal derangements. This clinical study demonstrates that internal derangements do occur in the pediatric age-group: the high percentages of both internal derangements and degenerative joint disease suggest a cautious clinical acceptance of imaging for internal derangements in the young patient. This reluctance to study these patients should be minimized by the new, noninvasive imaging modality available in magnetic resonance.

Adolescent↗