1. Ra SW: A study on the cognition for dental hygienist of university students in Seoul. [thesis], Dankook University, [Cheonan], 2005.
2. Lee MO: Perception of dental hygienists on issues in device disinfection and infection prevention measures in dental clinics. [thesis], Jinju Health College, [Jinju], 1994.
3. Kang BW, Kang JK, Kwak JS, Kwon HS, Kim, et al.: Dental hygieology. 3rd ed. Cunggu Publishing, Seoul, 2003.
4. Choi SJ: A study on the status of performance of infection control standard sin dental staff. [thesis], Wonkwang University, [Iksan], 2010.
5. Ministry of Health and Welfare: Significant caries (SiC) index for 2006. Ministry of Health Welfare and Family Affairs, Seoul, 2007.