Methods: Iowa Fluoride Study participants were recruited at birth from 8 Iowa hospitals and followed longitudinally with dental exams at ages 5, 9, 13 and 17. All subjects with both age 13 and age 17 dental exams (currently N=239) were evaluated by 3 calibrated dentists for caries using standardized criteria (Sound, D0, D1, D2, F) at the tooth surface level in primarily visual exams without radiographs. Increases in D2 and F were tabulated for each tooth’s surface type and overall. Intraclass correlations were used to evaluate within-subject caries associations by tooth type.
Results: Most new caries was fillings, with D2 increments found on only 0.1% of incisors, 0.2% of canines, 0.2% of premolars and 1.9% of molars, with most (1.4%) on the molar occlusal surfaces. New fillings were found on 0.5% of incisors, 0.4% of canines, 1.3% of premolars and 14.5% of molars, with most (13.7%) on the molar occlusal surfaces. Maxillary/mandibular incisor/canine/premolar incidence was similar, with 1.4% D2F incidence per maxillary tooth and 0.6% D2F incidence per mandibular tooth. Maxillary/mandibular molar incidence was also similar, with 15.1% D2F incidence per maxillary molar and 17.2% D2F incidence per mandibular molar. Within-subject intraclass correlations of D2F incidence for incisors, canines and premolars was low (ICC=0.16, 0.11, and 0.10, respectively), but higher for molars (ICC=0.28).
Conclusions: Most new caries activity within the Iowa Fluoride Study cohort is occurring on the occlusal surfaces of the molars, and it is mostly fillings, rather than new D2.
Keywords: Adolescence, Caries and Incidence
See more of: Behavioral, Epidemiologic, and Health Services Research