Table 1. Description of the included teeth (N=176).

	Number	Percentage
Gender
Female	100	56.8
Male	76	43.2
Tooth type
Anterior	42	23.9
Posterior	134	76.1
Number of roots per tooth
Single rooted	70	39.88
Two roots	60	34.1
Three or more	46	26.1
Number of canals per tooth
Single canal	69	39.2
Two canals	27	15
Three canals	64	36.4
Four canals	15	8.5
Five canals	1	0.6