The aim was to study any variability in approximal and occlusal caries diag
noses and restorative treatment decisions among Swedish dentists. The mater
ial consisted of a pre-coded questionnaire sent to a random sample of 923 d
entists with 4 items concerning approximal and occlusal caries diagnosis an
d restorative treatment decisions. Responses were received from 651 (70.5%)
dentists. In an adolescent with low caries activity and good oral hygiene,
more than 90% of the dentists stated that they would not automatically res
tore a primary approximal caries lesion if its radiographic appearance did
not show obvious progression in the outer 1/3 to 1/2 of the dentin. Moreove
r, 67% of the dentists would only consider immediate restorative treatment
of an occlusal surface if obvious cavitation and/or radiographic signs of d
entin caries could be observed. When diagnosing questionable occlusal carie
s, the dentists largely relied on the radiographic appearance. Concerning b
oth approximal and occlusal caries, the threshold for restorative treatment
differed between the metropolitan regions in Sweden, and younger more ofte
n than older dentists would postpone restorative treatment of approximal ca
ries until the lesion had reached a relatively advanced stage of progressio
n The responses also showed that dentists in private practice would restore
approximal caries at an earlier stage of progression than the dentists in
the Public Dental Health Service.