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The influence of socio-demographic characteristics on maxillary first molar derotation in children with mixed dentition

Gergana Ivanova, Hristina Arnautska, Zornitsa Vulcheva, Iliana Atanasova, Radosveta Andreeva


Esthetic facial appearance and long-term stability of normal occlusion are the major goals of orthodontic treatment. Meeting these goals is based on orthognathic occlusion and a well-aligned arch. The accomplishment of these goals depends on proper and well-timed prophylaxis performed in early mixed dentition.

AIM: The purpose of this study was to evaluate the influence of socio-demographic characteristics on maxillary first molar rotation in mixed dentition.

MATERIALS AND METHODS: The sample included 681 untreated patients aged 7-10 years who were evaluated with the aid of the Friel Henry and Vigano analysis methods for assessment of the magnitude of maxillary molar rotation. The results were summarized and presented by gender, age and dental class. Then they were processed statistically by using descriptive, variation and comparative analysis.

RESULTS AND DISCUSSION: Statistically significant difference was observed in this study in two groups divided by gender - the incidence of upper first molar rotation is higher in girls than in boys regardless of the side - left or right. No significant impact of age on molar rotation was observed. The most frequently established malposition is bilateral mediolingual rotation of the upper permanent first molars.

CONCLUSION: It appears that age is not a factor influencing maxillary permanent first molars but the gender is an important factor to be considered. The incidence of rotation is higher in girls than boys.


mesiolingual rotation; upper permanent first molar; mixed dentition; socio-demographic characteristics

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