Evaluation of spontaneous space closure and development of permanent dentition after extraction of hypomineralized permanent first molars.
OBJECTIVE
The aim of this study was to evaluate spontaneous space closure, development of the permanent dentition, and need for orthodontic treatment after extraction of permanent first molars due to severe molar-incisor hypomineralization (MIH).


METHODS
Twenty-seven children aged 5.6-12.7 (median 8.2) years had one to four permanent first molars extracted due to severe MIH. Each case was followed up on individual indications 3.8-8.3 (median 5.7) years after extractions. The eruption of the permanent dentition, and space closure were documented by orthopantomograms, casts, photographs, and/or bitewings.


RESULTS
Fifteen children were judged to have a favourable spontaneous development of their permanent dentition without any orthodontic intervention. Seven children were or should be subjected to orthodontic treatment for other reasons registered prior to the extraction. Five children were judged to have a treatment at least caused by the extractions, but three of them abstained because of no subjective treatment need.


CONCLUSIONS
Extraction of permanent first molars severely affected by MIH is a good treatment alternative. Favourable spontaneous space reduction and development of the permanent dentition positioning can be expected without any intervention in the majority of cases extracted prior to the eruption of the second molar.
Specialist Clinic of Pedodontics, Sahlgrenska University Hospital Mölndal, Sweden. birgitta.jalevik@vgregion.se
Birgitta
B
Jälevik
Marie
M
Möller
D002648:Child; D002675:Child, Preschool; D003766:Dental Occlusion; D003970:Diastema; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D003765:Models, Dental; D008963:Molar / Q000601:surgery*; D020380:Needs Assessment; D009971:Orthodontics, Corrective; D023861:Photography, Dental; D016300:Radiography, Bitewing; D011862:Radiography, Panoramic; D017001:Tooth Demineralization / Q000601:surgery*; D014078:Tooth Eruption / Q000502:physiology; D014081:Tooth Extraction; D014085:Tooth Migration / Q000145:classification*