G. Iliev DMD*, J. Pavlova DMD, PhD**, D. Filtchev DMD, PhD**,

S. Rangelov***, B. Kocheva***, M. Dimova***,

S. Nasif-Makki***, A. Filtchev DMD, PhD, DSc****

Purpose: To determine the proportion prevailing in the natural dentition and to define the types of dominance, by examine the interrelation between widths, heights and areas of the upper frontal teeth on plaster models.

Materials: 61 students at the Faculty of Dental Medicine, Medical University of Sofia, 27 male, 34 female, aged 18  to 30, were examinated, all of them with natural dentition, without gingival recessions or orthodontic disorders in the frontal area. 122 segments of the upper jaw, left and right, were measured.

Methods: Impressions were taken from the upper jaw of every participant using fabric trays and alginate. Plaster models (Class III) were prepared. On every frontal tooth of the models, with fine-tipped pen (0.3 mm), following points were marked: mesial and distal angle and the cervical zeny- th of the tooth. From the zenyth to the incisal edge, respec- tively to the cusp of the canine, a perpendicular line was lowered. Measurements were made by a digital calliper- gauge. The areas of the teeth were calculated.

Results: The interrelations between widths, heights and ar- eas of the upper frontal teeth were determined. Three types of dominance in natural dentition were established: high, medium and low; their characteristics and average param- eters were determined, separately for women and men.

Conclusion: Medium (Norm) dominance is most charac- teristic of natural dentition with proportional ratio between central incisors: lateral incisors: canines as follows:

¨ Women: Widths: 1,28 : 1:1,14; Heights: 1,17 : 1:1,12; Ar-

eas: 1,48 : 1:1,29

¨ Men: Widths: 1,33 : 1:1,17; Heights: 1,17 : 1:1,15; Areas:

1,57 : 1:1,36

Keywords: upper frontal teeth, dominance, proportions

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