Table 5.

Comparative Studies

	Hirschfield - Wasserman (1978)	McFall (1982)	Wood et al. (1989)	Tonetti et al. (2000)	Konig et al. (2002)	Fardal et al. (2004)	Dannewitz et al. (2006)	Faggion et al. (2007)	Miyamoto et al. (2010)	Present study (2012)
Number of patients	600	100	63	273	142	100	71	195	295	102
Mean age	42	44	45	52	46	46	46	48	42	42
Mean observation period (years)	22	19	13.6	5.6	10.5	9.8	5	11.8	20	24.2
Teeth evaluated	All Teeth	All Teeth	All Teeth	All Teeth	All Teeth	All Teeth	Molars Only	All Teeth	All Teeth	Molars Only
Percentage of teeth extracted during active therapy	N/A	N/A	N/A	4.8%	N/A	4.98%	6.5%	3.6%	5	3.9%
Percentage of teeth extracted during maintenance	8.4%	11.4%	7.1%	4.2%	3.0%	N/A	7.5%	5.5%	8.6%	17.7%
Mean annual tooth-loss rate	0.08	0.14	0.10	0.40	0.07	0.04	N/A	0.11	N/A	0.07

Table adapted from Faggion, CM: Prognostic model for tooth survival in patients treated for periodontitis, J Clin Periodontol 2007; 34: 226–231.