Study	Reason for exclusion
Fujii 2005	Outcome of no interest ‐ change in occluding contact points.
Hamada 1982	Case series.
Harada 2006	Data inappropriately reported. Unsuccessful personal contact.
Holmgren 1990	Case series.
Leib 2001	Case series.
Manns 1983	Outcome not specified. Unsuccessful personal contact.
Mejias 1982	Non‐randomised clinical study.
Nagels 2001	Case series.
Okeson 1987	Non‐randomised clinical study.
Ommerborn 2003	Non‐randomised clinical study.
Pierce 1988	Data inappropriately reported. Unsuccessful personal contact.
Raphael 2003	Inclusion criteria not specified. Unsuccessful personal contact.
Sakaguchi 2003	Non‐randomised clinical study.
Shankland 2002	Inclusion criteria not specified. Unsuccessful personal contact.
Sheikholeslam 1986	Case series.
Sheikholeslam 1993	Case series.
Shiau 1980	Non‐randomised clinical study.
Tomonaga 2005	Non‐randomised clinical study.
Wang 1993	Non‐randomised clinical study.
Wieselmann 1986	Case series.
Wieselmann 1987 a	Case series.
Wieselmann 1987 b	Case series.
Wieselmann 1987 c	Case series.
Yin 2004	Randomisation not stated. Unsuccessful personal contact.