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Original scientific paper

Analysis of Developmental and Occlusal Characteristics of Primary Dention in Examinees with and Without Crowding of Permanent Teeth

Asja Miličić ; Department of Orthodontics, Zagreb, Croatia
Vesna Gaži-Čoklica ; Department of Orthodontics, Zagreb, Croatia
Mladen Šlaj ; Department of Orthodontics, Zagreb, Croatia
Senka Rajić ; Department of Orthodontics, Zagreb, Croatia

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The fact that crowding appears in a larger number of cases for the first time during the replacement of teeth does not exclude the possibility o f an earlier appearance o f certain indicators, on the basis
of which a future malocclusion could be predicted. In order to verify the stated hypothesis we decided to extract the factors which could be relevant to the development of crowding by means of analysis o f qualitative and quantitative characteristics o f primary dentition and by means of the evaluation o f the influence o f each individual feature on the spatial conditions in permanent dentition. The sample consisted o f 76 examinees o f both sexes which were longitudinally surveyed throughout eight years. For each examinee the following characteristics were registered and evaluated: existence o f primatical diastemas in the lower jaw, degree o f abrasion, existence and degree o f physiological diastemas in the upper jaw, condition o f equidistal planes, sagital interrelation determined by canines, overbite, transversal interrelation and overjet. After 8 years the examinees were divided into the group with crowding (51) and the group without crowding (25). The data were processed by the SAS software, for each group individually and compared mutually. The established hypothesis regarding the existence o f early symptoms relevant to the emergence o f crowding of permanent teeth has received only partial confirmation in the conducted survey. From the findings analyzed it follows that the appearance o f crowding is in the relation with the lack o f physiological diastemas; the absence or early closure o f the primatical diastema; the early loss o f equidistal plane and caries or extraction o f primary teeth. A more favorable prognosis in preventing the appearance o f crowding can be assigned to bigger physiological diastemas, the persistence of equidistal planes, the presence of primatical diastemas and intact primary teeth.


crowding, occlusal characteristics, longitudinal study

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