关键词: 颞下颌关节, 关节盘前移位, 关节盘锚固术, MRI

Abstract:

Objective　To evaluate the stability of disc position and condylar status by magnetic resonance imaging （MRI）after temporomandibular joint （TMJ）disc repositioning surgery with miniscrew anchor technique. Methods　Totally 150 cases of patients diagnosed with anterior disc displacement （ADD）who received disc repositioning （210 joints）were selected from February 2009 to July 2017 in the Department of Oral Surgery，Ninth People’s Hospital，Shanghai Jiao Tong University School of Medicine. MRIs within 1 week after operation and during at least 1 year follow-up were used to evaluate changes in the disc position and condylar bone. During follow-up，ADD without reduction was considered relapse and the bone status was classified as regeneration or degeneration. Results　Postoperative MRIs showed that all the discs were repositioned. During 12 to 96 months of follow-up （averaged 26.73 months），95.71%（201/210） of the discs  were still in position，whereas 5.71%（12/210） of the discs  had relapsed anteriorly. Condylar new bone formation was observed in 77.62% （163/210） of the joints，no bone change in 20.48% （43/210） of the joints，and bone resorption in 1.90% （4/210） of the joints. Conclusion　TMJ disc repositioning by miniscrew anchor provides an effective means for the treatment of anterior disc displacement with stable result. Disc repositioin can also stimulate condylar bone regeneration.

Key words: temporomandibular joint, anterior disc displacement, disc repositioning with miniscrew anchor, MRI