A comparison of the quality of root canal treatment in two Danish subpopulations examined 1974–75 and 1997–98

Abstract

Whilst the technical quality of endodontic treatment had improved during the last 24 years, basic differences between the populations prevented assessment of the impact of this change on disease frequencies. The study indicates that great care should be taken when comparing different patient populations, in particular more emphasis should be placed on the selection and description of study groups.