The All-on-four concept for fixed full-arch rehabilitation of the edentulous maxilla and mandible: a longitudinal study in Japanese patients with 3–17-year follow-up and analysis of risk factors for survival rate

International Journal of Implant Dentistry

Table 1 Descriptive patient data

	Number
Total	561
Sex
Male	287
Female	274
Age (years; mean ± SD)	57.2 ± 10.4
Observation period (months; mean ± SD)	105.7 ± 44.5
Smoker
Yes	200
No	361
Systemic disease
Healthy	332
Diabetes	19
Osteoporosis	4
Circulatory diseases	93
Combined*	14
Other**	99

*Combined: systemic disease combination of diabetes and circulatory disease (n = 13); osteoporosis and circulatory disease (n = 1)
**For example, dyslipidemia, asthma, thyroid disease