There are few longitudinal studies in which the development of caries over a long period of time has been studied for different age groups. Such studies are important because they can provide information to assess future needs for dental care and the implications if the development of caries is different for patients in different age groups. We describe changes in caries during the period 2003-2012 for several birth cohorts in Norway, using longitudinal data collected annually for each individual during a period of 10 years. The data set included patients born during the period 1940-1989 who received regular dental care in the public dental services in the county of Hedmark - altogether 7,519 patients. Information about caries was obtained from the electronic patient records. Nearly 90% of the patients had no caries for at least 5 years during the 10-year study period, and nearly 50% had no caries for at least 8 years. This pattern was similar for all birth cohorts. The mean number of carious teeth per patient decreased from 2003 to 2012. This decrease was particularly large at the end of the period and among the oldest birth cohorts, i.e. those born in the periods 1940-1949 and 1950-1959. Our findings indicate that the need for restorative treatment is reducing, particularly in the older age groups. Fewer dentists and more dental hygienists may be needed in the future to provide routine follow-up and care.

Keywords:
Adults, Caries trends, Children, Longitudinal study
1.
Allison PD: Fixed Effects Regression Models: Quantitative Applications in the Social Sciences. Los Angeles, Sage Publications, 2009, vol 160.
2.
Dobloug A, Grytten J, Holst D: Dentist-specific variation in diagnosis of caries - a multilevel analysis. Community Dent Oral Epidemiol 2014;42:185-191.
3.
Grytten J, Holst D, Skau I: Incentives and remuneration systems in dental services. Int J Health Care Finance Econ 2009;9:259-278.
4.
Grytten J, Lund E: Future demand for dental care in Norway; a macro-economic perspective. Community Dent Oral Epidemiol 1999;27:321-330.
5.
Grytten J, Skau I: Specialization and competition in dental health services. Health Econ 2009;18:457-466.
6.
Grytten J, Skau I, Holst D: Demand for dental services and dental treatment patterns among Norwegian adults. Nor Dent J 2014;124:276-283.
7.
Grytten J, Sørensen R: Competition and dental services. Health Econ 2000;9:447-461.
8.
Holst D, Schuller AA: Equality in adults' oral health in Norway. Cohort and cross-sectional results over 33 years. Community Dent Oral Epidemiol 2011;39:488-497.
9.
Kidd EAM, Mejàre I, Nyvad B: Clinical and radiographic diagnosis; in Fejerskov O, Kidd J (eds): Dental Caries: The Disease and Its Clinical Management. Oxford, Blackwell Munksgaard, 2003, p 115.
10.
Mejàre I, Stenlund H, Zelezny-Holmlund C: Caries incidence and lesion progression from adolescence to young adulthood: a prospective 15-year cohort study in Sweden. Caries Res 2004;38:130-141.
11.
Norwegian Broadcasting Corporation (NRK): Offentlige tannleger er ikke de rimeligste. 2013. http://www.nrk.no/livsstil/private-tannleger-er-billigst-1.11211284.
12.
Skudutyte-Rysstad R, Eriksen HM, Bjertness E: Oral health among 35-year-olds in Oslo, Norway. A summary of time trends 1973-2003. Nor Epidemiol 2012;22:39-46.
13.
Statistics Norway. 2014. http://statbank.ssb.no/statistikkbanken/.
14.
Thomson WM: Dental caries experience in older people over time: what can the large cohort studies tell us? Br Dent J 2004;196:89-92.
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2015
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