Abstract
To evaluate and compare outcomes and complications associated with reconstruction
of the temporomandibular joint (TMJ), we prospectively analysed the data of 70 patients
who had their joints replaced with stock prostheses during the period 2004-14 and
who had been followed up for five years. We used two types of stock prostheses: the
metal-on-metal Christensen system (CS), and the ultra-high-molecular-weight-polyethylene-on-metal
Biomet® system (BS). Data were collected at 3, 6, 12, 24, 36, 48, and 60 months postoperatively
and compared with preoperative measurements. Five years after the replacement there
was an increase in mean (SD) mouth opening from 2.0 (0.6) to 4.0 (0.5 cm) (p = 0.012) in the CS, and from 2.5 (1.0) cm to 4.1 (0.6) cm (p = 0.018) in the BS. The mean (SD) reductions in visual analogue pain scores were from
6.9 (1.6) to 2.0 (1.4) (p = 0.001) in the CS, and 6.5 (1.4) to 1.5 (1.1) (p = 0.001) in the BS. There were no significant differences in improvements in mouth opening
or reduction in pain between the two groups. However, there were differences in the
number of implants that failed, which led to removal and replacement of 2/14 prostheses
in the CS group and 3/77 in the BS group (p = 0.06). The results supported the placement of stock prostheses, as evidenced by a
low incidence of complications and adverse events, and a long-term improvement in
function and reduction in pain in the TMJ. The BS group had significantly fewer prosthetic
failures than the CS group.
Keywords
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Article info
Publication history
Published online: November 07, 2019
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© 2019 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.