Modified Temporomandibular Joint Disc Repositioning With Mini-screw Anchor: Part II-Stability Evaluation by Magnetic Resonance Imaging

Qin Zhou; Huimin Zhu; Dongmei He; Chi Yang; Xinyu Song; Edward Ellis 3rd

doi:10.1016/j.joms.2018.07.016

Modified Temporomandibular Joint Disc Repositioning With Mini-screw Anchor: Part II-Stability Evaluation by Magnetic Resonance Imaging

J Oral Maxillofac Surg. 2019 Feb;77(2):273-279. doi: 10.1016/j.joms.2018.07.016. Epub 2018 Jul 24.

Authors

Qin Zhou¹, Huimin Zhu², Dongmei He³, Chi Yang⁴, Xinyu Song², Edward Ellis 3rd⁵

Affiliations

¹ Attending, Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai; Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai; National Clinical Research Center of Stomatology, Shanghai, China.
² Resident, Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai; Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai; National Clinical Research Center of Stomatology, Shanghai, China.
³ Professor, Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai; Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai; National Clinical Research Center of Stomatology, Shanghai, China. Electronic address: dongmeihe119@yahoo.com.
⁴ Professor, Department of Oral Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai; Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai; National Clinical Research Center of Stomatology, Shanghai, China.
⁵ Professor, Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, San Antonio, TX.

PMID: 30118666
DOI: 10.1016/j.joms.2018.07.016

Abstract

Purpose: The purpose of this study was to evaluate the stability of disc position and condylar status by magnetic resonance imaging (MRI) after temporomandibular joint (TMJ) disc repositioning surgery with a mini-screw anchor technique.

Materials and methods: Patients diagnosed with anterior disc displacement (ADD) and operated on for disc repositioning from 2010 through 2016 were included in the study. MRI scans within 1 week after operation (T1) and during at least 1-year follow-up were used to evaluate changes in 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: One hundred seven patients with 149 joints were included in the study. Postoperative MRI scans (T1) showed that all discs were repositioned. During an average 23.40-month follow-up (range, 12 to 84 months), 95.3% of discs (142 of 149) were still in position, whereas 4.7% of discs (7 of 149) had relapsed anteriorly. New condylar bone formation was observed in 74.50% of joints (111 of 149), no bone change was observed in 23.49% of joints (35 of 149), and bone resorption was observed in 2.01% of joints (3 of 149).

Conclusions: TMJ disc repositioning by a mini-screw anchor provides stability for treatment of ADD. Disc repositioning also can stimulate condylar bone regeneration.

MeSH terms

Bone Screws
Humans
Magnetic Resonance Imaging
Mandibular Condyle
Temporomandibular Joint Disc
Temporomandibular Joint Disorders* / diagnostic imaging