Impact of temporomandibular joint discectomy on condyle morphology: an animal study

Publication date: Available online 30 December 2017
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Reinaldo Abdala-Júnior, Arthur Rodriguez Gonzalez Cortes, Eduardo Massaharu Aoki, Simone Ferreira, João Gualberto Cerqueira Luz, Emiko Saito Arita, Jefferson Xavier de Oliveira
PurposeTemporomandibular disorders (TMD) lead to parafunctional activity that may alter bone remodeling of mandibular components. This animal study aimed to assess the impact of temporomandibular joint discectomy on condyle bone microarchitecture.Material and MethodsA total of 30 one-month-old Wistar rats were assessed and divided in three equal groups (two tests and one control) of 10. The first test group underwent disc removal (DRm; the second test group underwent disc and condylar cartilage removal (DCR); and the 10 remaining rats were analyzed as sham-operated controls (CTR), following a split-mouth design. Rats were sacrificed two months after surgery, and the respective mandibles were scanned with micro-CT for quantitative morphometric analysis.ResultsThere were significant differences among the three groups analyzed (DR, DCR and CTR) for Bone volume fraction (BV/TV, p=0.044), Structure model index (p<0.001), Fractal Dimension (p=0.024) and porosity (p=0.023). In addition, operated and contralateral non-operated sides significantly differed for all variables in at least one of the test groups (p<0.05), but not in the control group (p>0.05).ConclusionWithin the limitations of this study, the present results suggest that discectomy may lead to alterations of the mandibular condylar morphology.



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