Table 3.

Cross-tabulation of smoking, history of bruxism, and treatment provider factors to verify a possible association of treatment provider to the higher prosthesis failure rate in nonsmokers among nonbruxers.

Treatment provider			History of bruxism		Total
			No	Yes
Dental student	Smoking	No	13	12	25
		Yes	9	7	16
		Quit smoking	2	5	7
	Total		24	24	48
General practitioner or specialist	Smoking	No	0	8	8
		Yes	6	2	8
		Quit smoking	0	1	1
	Total		6	11	17
Total	Smoking	No	13	20	33
		Yes	15	9	24
		Quit smoking	2	6	8
	Total		30	35	65