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Journal of Dental Research
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*Head and Brain Malformations
*Joint Disorders
*Temporomandibular Joint Dysfunction
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*TANTALUM
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Biological

Bilateral TMJ Disk Displacement Induces Mandibular Retrognathia

F. Bryndahl1, L. Eriksson2, P.E. Legrell1 and A. Isberg1,*

1 Department of Odontology, Oral and Maxillofacial Radiology, Umeå University, SE-901 87 Umeå, Sweden; and
2 Department of Oral and Maxillofacial Surgery, Faculty of Odontology, Malmö University and Malmö University Hospital, Malmö, Sweden

Correspondence: * corresponding author, Annika.Isberg{at}odont.umu.se

Unilateral non-reducing TMJ disk displacement has been shown to retard mandibular growth on the ipsilateral side, with facial asymmetry a sequela. We hypothesized that bilateral affliction would impair mandibular growth bilaterally, generating mandibular retrognathia. Non-reducing TMJ disk displacement was surgically created in 10 growing New Zealand White rabbits. Ten additional rabbits served as a sham-operated control group. Facial growth was followed in serial cephalograms, with tantalum implants, during a period corresponding to childhood and adolescence in man. The results verified that bilateral non-reducing TMJ disk displacement retarded mandibular growth bilaterally, the extent corresponding to mandibular retrognathia in man. Maxillary growth was also retarded, but to a lesser degree. Growth impairment fluctuated over time, the most striking retardation occurring during periods of general growth acceleration. This should be taken into consideration when orthodontic treatment, aimed at stimulating mandibular growth, is initiated in adolescent individuals with non-reducing TMJ disk displacement.

Key Words: adolescence • mandibular growth • maxillary growth • temporomandibular joint

Journal of Dental Research, Vol. 85, No. 12, 1118-1123 (2006)
DOI: 10.1177/154405910608501210
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