H. Forssell et al., Occlusal treatments in temporomandibular disorders: a qualitative systematic review of randomized controlled trials, PAIN, 83(3), 1999, pp. 549-560
Occlusal treatments (occlusal splints and occlusal adjustment) are controve
rsial but widely used treatment methods for temporomandibular disorders (TM
D). To investigate whether studies are in agreement with current clinical p
ractices, a systematic review of randomized controlled trials (RCTs) of occ
lusal treatment studies from the period 1966 to March 1999 was undertaken.
Eighteen studies met the inclusion criteria, 14 on splint therapy, and 4 on
occlusal adjustment. The trials were scored using the quality scale presen
ted by Antczak et al., 1996a (A.A. Antczak, J. Tang, T.C. Chalmers, Quality
assessment of randomized control trials in dental research. I. Methods, J.
Periodontal Res. 1986a;21:305-314). The overall quality of the trials was
fairly low, the mean quality score was 0.43/1.00 (range 0.12-0.78). The mos
t obvious methodological shortcomings were inadequate blinding, small sampl
e sizes, short follow-up times, great diversity of outcome measures and num
erous control treatments, some of unknown effectiveness. Splint therapy was
found superior to 3, and comparable to 12 control treatments, and superior
or comparable to 4 passive controls, respectively. Occlusal adjustment was
found comparable to 2 and inferior to one control treatment and comparable
to passive control in one study. Because of the methodological problems, o
nly suggestive conclusions can be drawn. The use of occlusal splints may be
of some benefit in the treatment of TMD. Evidence for the use of occlusal
adjustment is lacking. There is an obvious need for well designed controlle
d studies to analyse the current clinical practices. (C) 1999 International
Association for the Study of Pain. Published by Elsevier Science B.V.