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Orthodontic treatment methods and appliances vary to some degree in the Nordic countries. Orthodontists in Finland favour early treatment and frequently use appliances that work well in the deciduous and early mixed dentition. This seems to be related to the orthodontic research tradition in Finland which places emphasis on the growth and development of the craniofacial complex. A need for simple orthodontic treatment techniques, manageable by dentists who have a central role in the delivery of treatment, also direct the focus on interception and early treatment. In early treatment, the diagnosis of unfavourable occlusal or skeletal development is largely based on the deciduous occlusion. It is therefore crucial that not only orthodontists but also the dentists and auxiliary personnel have a proper knowledge of normal occlusion and are able to detect signs of abnormal development. The orthodontic appliances that are most frequently used in the deciduous and early mixed dentition, include head gear, quad helix and eruption guidance appliance. Finnish studies have shown that head gear is an effective tool in Class II correction. In transversal problems, the quad helix gives good treatment results if used early. The eruption guidance appliance works efficiently both as an interceptive and a corrective tool in the early treatment of Class II malocclusion, excess overjet, deep bite and crowding. Furthermore, the anterior face mask has been found to be effective in the early treatment of Class III patients. Finnish orthodontists and dentists have obtained good results with early orthodontic treatment. Clinical experience shows that it has been possible to reduce further need for treatment, simplify later treatment phases, and to expand the coverage of treatment.

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