The prevalence of periodontal disease and overhanging approximal amalgam restorations in molars and premolars was registered in a clinical and radiographic examination of Norwegian adults (born 1959). A random sample of 250 persons was drawn from the populations of two neighboring towns where the Public Dental Services had operated different preventive programs. Results pertain to approximately 175 subjects whose mean age was 21.5 yr (SD 0.3). Twelve subjects had no gingival bleeding and the mean Gingival Bleeding Index of the group was 30.8 (SD 17.6). No pocket depth exceeded 5 mm. In eight subjects the radiographic distance from the cementoenamel junction to the interproximal alveolar crest was greater than 2 mm at one or more teeth. The mean number of filled approximal surfaces in molars and premolars was 12.8 (SD 6.8). Approximal overhangs were present in 87% of subjects, and at 1/4 of restorations. Ninety-six percent of overhangs were less than 0.5 mm. There was no significant difference between the different subgroups of the sample for any of the variables studied.
The purpose of the present study was to assess the progression rate of approximal carious lesions in Norwegians aged 14-18 years. Sixty-five subjects whose average age at base line was 14.9 years had one pair of posterior bitewing radiographs taken annually from 1982 to 1986. One examiner assessed all radiographs in chronologic order, recording degree of approximal caries. When a surface changed from one state to another, it was assumed to have changed at the midpoint between the two examinations. A total of 590 lesions were observed. Uncensored lesions took on average nearly 3 years to penetrate the enamel. Inclusion of right censored lesions by the Kaplan-Meier approach increased the uncensored estimate by approximately 20%. The average for doubly censored lesions was about 6.5 years. Low average rate of caries progression coupled with wide variations between lesions and among subjects suggests a need for individually prescribed recall routines.
The purpose of the present study was to determine whether the caries-preventive effect of school-based programs with fluoride (F) mouthrinsing or toothbrushing was evident at the end of a post-treatment follow-up period of 11 years. Two groups of subjects examined at 14 years of age (born in 1960), who had participated in fortnightly F rinsing (n = 52) or in F brushing 4-5 times a year at school (n = 50), were re-examined radiographically and completed a questionnaire at age 25 years. A comparison group of 25-year-olds (n = 51) was also included. Analyses of variance showed that the benefits of participation in school-based F programs seem to have been lost. It appears that these caries-preventive programs have delayed rather than prevented caries and that F toothpaste and other caries-preventive efforts have been insufficient to avert a substantial caries activity during the follow-up period.
The purpose of this study was to compare caries prevalence in two groups of 21-yr-olds 6-7 yr after discontinuation of school-based preventive programs consisting respectively of fortnightly rinsing or brushing 3-5 times per year with NaF solutions. Stratified random samples of 125 persons were drawn from appropriate population registers. Non-response was 30%. Blind clinical and radiographic examinations were carried out and the subjects were interviewed concerning their dental health related behavior. The results revealed significantly lower mean DMFS score in the rinsing than in the brushing group (P less than 0.001). Comparisons with results of other studies suggest persistence of benefits of school-based preventive programs after discontinuation.
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