title: Bilateral TMJ disk displacement induces mandibular retrognathia.
abstract: 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.
authors.affiliation: Department of Odontology, Oral and Maxillofacial Radiology, Umeå University, SE-901 87 Umeå, and Department of Oral and Maxillofacial Surgery, Malmö University Hospital, Sweden.
authors.forename: F
authors.initials: F
authors.lastname: Bryndahl
authors.forename: L
authors.initials: L
authors.lastname: Eriksson
authors.forename: P E
authors.initials: PE
authors.lastname: Legrell
authors.forename: A
authors.initials: A
authors.lastname: Isberg
mesh_terms: D000818:Animals; D002508:Cephalometry; D004195:Disease Models, Animal; D020007:Implants, Experimental; D004204:Joint Dislocations / Q000150:complications* / Q000000981:diagnostic imaging / Q000503:physiopathology; D008334:Mandible / Q000000981:diagnostic imaging / Q000254:growth & development; D008437:Maxilla / Q000000981:diagnostic imaging / Q000254:growth & development; D008445:Maxillofacial Development / Q000502:physiology; D011817:Rabbits; D011859:Radiography; D011897:Random Allocation; D063173:Retrognathia / Q000000981:diagnostic imaging / Q000209:etiology*; D013635:Tantalum; D019224:Temporomandibular Joint Disc / Q000000981:diagnostic imaging / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000150:complications* / Q000000981:diagnostic imaging / Q000503:physiopathology; D014716:Vertical Dimension
chemical_list: D013635:Tantalum