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Gabriel, Annegret (2007): Physiologische Veränderung der Molarenrelation und Platzverhältnisse während des Übergangs vom Wechselgebiss zum permanenten Gebiss. Dissertation, LMU München: Medizinische Fakultät



Establishment of molar relation under physiologic conditions is a dynamic process during development of the occlusion. For the clinician it is interesting to be able to predict these physiological proceedings from an early point of development to evaluate treatment need for a patient, possible self-corrections and interference of treatment with ongoing physiological maturation. AIM OF THIS STUDY: To describe longitudinal changes in molar relation from the early mixed to the permanent dentition as a result of normal development and to study associations between the change in molar relation and different dental parameters with special focus on the space conditions. MATERIAL AND METHODS: Dental casts of fifty orthodontically untreated children were evaluated longitudinally at the age 7, 11 and13 years. A space analysis for each quadrant was performed and the molar relationship was registered at each stage. To evaluate the effect of space conditions and possible molar migration on the existing molar relationship the upper and lower molars were mentally transferred to a position in the dental arch, which is neutralizing the existing surplus or lack of space in each quadrant. The relation of the lower molar to the upper one in the new position is called “corrected occlusion”. RESULTS AND CONCLUSION: The mean molar occlusion has a tendency for developing a less distal relation during establishment of the permanent dentition. Self-corrections do occur, but not in a frequency warranting reduced importance of early initiating of orthodontic screening and treatment. When the cases were grouped according to variable «corrected occlusion», a rather good agreement between the early mixed and permanent dentition was demonstrated; indicating a certain stability of the molar relation after isolating the effect of the space conditions.