Effects of water fluoride exposure at crown completion and maturation on caries of permanent first molars.

摘要: Pre-eruptive fluoride exposure has been shown to be important for caries prevention. This paper aimed determine the relative effects of water during crown completion (CC) and maturation on experience in first permanent molars. Parental questionnaires covering residential history were linked oral examinations 19,885 6- 15-year-old Australian children conducted 1992 by School Dental Services South Australia Queensland. The percentage lifetime exposed optimally fluoridated at CC, (MAT) post-eruption (POST) was calculated. Combined variables describing different levels created using a threshold 50%. Compared reference CC or =50%/MAT =50% [rate ratio (RR) 0.52], > =50%/POST (RR 0.67) had strongest caries-preventive effect, followed = 0.81) negative binomial regression models (p 0.84) weaker, non-significant effects. In conclusion high prevention irrespective effect post-eruption. produced supplemented and/or post-eruption, but latter two phases could not produce significant their own. Since most occurred pit fissure surfaces, findings relate this class lesion.