Correlación de medidas angulares entre radiografías cefalométricas y fotografías faciales para determinar la clase ósea

Abstract

Introduction: the predictability of cephalometric values through the photographs could be a non invasive method relevant especially in cases of large-scale epidemiological studies. Material and methods: we used 266 radiographs and digital photographs of patients of both sexes (57,9% female and 42,1% male) aged between 8 and 11 years old, who underwent orthodontic treatment at the Dental Department at Hospital San Rafael de Madrid in the last five years. Cephalometric measurements were Steiner´s SNA, SNB and ANB and their counterparts in soft tissue (TN´A´, TN´B´ and TN´A´-TN´B´). The statistical analysis was made with SPSS 17.0 program for windows. Results: the results show that there is a statistically significant positive correlation between SNA and TN´A´ ( rho = 0.242 , p < 0.01 ) and SNB and TN´B´ ( rho = 0.297 , p < 0.01 ) and ANB with TN´A´-TN´B´ ( rho = 0.528 , p <0.01). In our sample, the mean value of TN´A´- TN´B´ was 7,7±2,4 for class I, 9,9±2,7 for class II and 3,8± 2,5 for class III. Conclusion: according to the statistical results obtained, there is a significant correlation between certain skeletal cephalometric measurements (SNA , SNB and ANB ) and surrounding soft tissue (TN´A ‘ ;TN´B;’ TN´A’ –TN´B´), but it is difficult to find a cutoff point to diagnose a skeletal class from the lateral photograph.