The aims of this study were to determine the prevalence of dental anxiety at the time when adolescents are leaving the public dental service, and to explore the relationship at this stage between dental anxiety and some possible etiologic factors. The sample consisted of 571 18-yr-olds in high school who completed a questionnaire and three psychometric scales, the Dental Fear Scale (DFS), the Dental Beliefs Survey (DBS) and the Geer Fear Scale (GFS), in the classroom. The relationship between dental anxiety (DFS and DBS) and a total of nine possible etiologic factors was explored by the use of stepwise regression analyses, and risk estimates (odds ratio) were calculated in cross-tables. There were significant sex differences for DFS and for GFS, but not for DBS. Nineteen percent of the total sample were classified as having high dental anxiety (DFS > 59). Previous experiences of pain, phobic anxiety indexed by GFS and pain at the last dental visit entered into the stepwise regression models of both dental anxiety indices explaining 50% of the variance of DFS, but only 18% of DBS. Students who reported more than one previous experience of pain were 9.9 times more likely to report high dental anxiety as recorded by DFS than the rest of the group. The corresponding risk factor for DBS was 3.4.

The aim of this study was to explore the prevalence and possible explanatory factors of dental avoidance due to dental anxiety among 12 to 18 year olds treated within the Norwegian Public Dental Service. A total of 754 20-yr-olds completed a questionnaire and three psychometric scales, the Dental Fear Scale (DFS), the Dental Beliefs Survey (DBS) and the Geer Fear Scale (GFS), and gave their consent to collect data from their dental records. A total of 169 subjects (22.4%) had high dental anxiety (DFS>59 or DBS>47 at age 20 yr), and 124 subjects (16.4%) had high frequency of missed/cancelled appointments (20% or more) during the period 12-18 yr. Forty-seven subjects (6.2%) fulfilling both of the above criteria constituted the dental avoidance group. An analysis using a stepwise regression model indicated that having had more than one painful or unpleasant treatment experience increased the risk of being included in the avoidance group by a factor of 10.9. Equally, adolescents who were not attending school (working or without specified occupation) increased the risk by a factor of 6.9, having a high caries experience by a factor of 5.0, and not having their dental treatment completed at the age of 18 yr by a factor of 4.4.

This study investigates the relationships among socio-demographic factors, dental status, and impaired oral health-related quality of life (OHRQoL) using a translation into Norwegian of the Oral Impacts on Daily Performance (OIDP) inventory. Data were collected as part of the Central Bureau of Statistics (CBS) OMNIBUS survey in Norway. The CBS drew a two-stage proportionate random sample, comprising 2,000 residents aged 16-79 yr, from the national population register. Information was available for 1,309 individuals (response rate 66.0%) who completed telephone interviews in November and December 2003. A total of 18.3% (95% confidence interval: 16.2-20.4) reported that an oral problem had affected at least one daily oral performance during the 6 months preceding the survey. The proportion of adults who confirmed impacts varied from 11.3% (eating) to 2.1% (social contact). Multiple logistic regression analysis revealed statistically significant disparities regarding respondents' age, residential area, dental attendance, and number of remaining teeth. The prevalence of OIDP in the Norwegian population was modest, but varied systematically with both socio-demographic and oral health-related factors. The consistently declining OIDP with increasing age after controlling for dental status suggests age-related changes of participants' values and expectations.

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The Oral Impacts on Daily Performance (OIDP) instrument was translated into Norwegian and reviewed for cultural and conceptual equivalence by a group of bilingual academics. A sample of employees from the University of Bergen completed the Norwegian OIDP frequency questionnaire twice. A total of 173 and 108 subjects participated in the first and the second administration, respectively, of this questionnaire. A two-stage proportionate random sample, comprising 2,000 residents (age-range 16-79 yr), was drawn from the national population register by the Central Bureau of Statistics. Information became available for 1,309 persons who completed telephone interviews. The Norwegian OIDP preserved the overall concept of the English version. Test-retest reliability, in terms of Cohen's kappa, was 0.65, and Cronbach's alpha was high (> or = 0.80). In both samples, variations in the OIDP scores were apparent in relation to self-reported oral health and number of remaining teeth, supporting construct and criterion validity of the inventory. Only three of the OIDP interviews were discarded, which supports face validity. A total of 18.3% confirmed that they had at least one oral impact. Age-specific rates were 17.5%, 19.0%, 17.9% and 18.4% among 16-24, 24-44, 45-66 and 67-79-yr-old participants. The satisfactory psychometric properties provide evidence for the cross-cultural use of the OIDP. The presence of a distinct floor effect indicates poor sensitivity of the OIDP to detect improvements of oral health-related quality of life at a population level. Prevalence estimates were low, suggesting that the current oral health status has little impact on the daily performance of the Norwegian adult population.