I think Sweden has traditionally carried out less rigorous age assessments than some other countries in Europe, but perhaps this case will lead to changes. Medical (or dental) screening is treated with caution everywhere and case law has generally accepted that the margin of error is too high for it to be relied upon without other supporting evidence.
The following is taken from UK government guidance on screening unaccompanied asylum seeking children:
The Royal College of Paediatricians, in their guidance on age assessment, have said that in practice, age determination is extremely difficult to do with certainty because it is an inexact science where the margin of error can sometimes be as much as 5 years either side. ‘The health of refugee children: guidelines for paediatricians’, Royal College of Paediatrics, chapter 5.6, November 1999).