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.
Andria LM, Reagin KB, Leite LP, King LB. Stastical evalatuation of possible factors affecting the saggital position of the first permanent molar in the maxilla. Angle orthod 2004; 74:220-225
Brodie AG. The angle concept of class II div 1 malocclussion. Angle Orthod 1931;1:117-38
Cattaneo, P. M., Dalstra M., Melsen, B. The Transfer of occlusal forces through the maxillary molars: A finite element study. Am J. Orthod Dentofacial Orthop. 2003; 123, No. 4: 367-373
Dahlquist A., U. Gebauer, and B. Ingervall, `The effect of a transpalatal arch for the correction of first molar rotation,` European Journal of Orthodontics, vol. 18, no. 3, pp. 257-267, 1996.
Downs, W. Mesial Drift. Angle Ortho. April 1938
Friel S. Determination of the angle of rotation of the upper first molar to the median raphe of the palate in different types of malocclusion. Dental Practitioner. 1959;9:72-8.
Henry R. G. , `Relationship of the maxillary first permanent molar in normal occlusion and malocclusion,` American Journal of Orthodontics, vol. 42, no. 4, pp. 288-306, 1956.
Joseph M. Sim. Minor Tooth Movement. 2nd ed. Saint Louis: The C. V. Mosby Company; 1977:11-12.
Viganó Cristiane de Oliveira, Viviane Ekerman da Rocha, Laerte Ribeiro Menezes Junior, Luiz Renato Paranhos, and Adilson Luiz Ramos. Rotation of the upper first molar in Class I, II, and III patients. Eur J Dent. 2016 Jan-Mar; 10(1): 59-63
