In cases of dental malocclusions with retroclined incisors, a darker smile may result since central incisors reflect less light. The purpose of this article is to assess if the degree of inclination of the four upper incisors can lead to changes in the brightness and color of the teeth and to evaluate the possibility of obtaining statistically significant data regarding the brightness of the lateral incisors using data from central incisors. A total of 40 subjects aged between 23 and 33 were selected. Three consecutive photos were taken for each individual at three different angles (0, 15,-15), referencing the Frankfurt Plane, to simulate torque movements of the anterior teeth. The photos in JPEG format produced integer RGB working data converted to CIE Lab* space with a standard CIE 2-degree observer. The selected area for color detection was at the center of the clinical crown of each tooth. When the head is inclined upward, all L*, a*, and b* change significantly in the overall transition from-15 to +15 for central incisors (L* from-15 to +15 50.293 vs 66.955 P<0.0001; a* from-15 to +15 0.896 vs 0.244 P<0.0001; b* from-15 to +15 2.239 P <0.0001) as for the lateral incisors, L* and a* change significantly in the overall transition from-15 to +15 (L* from-15 to +15 42.887 vs 59.386 P<0,0001; a* from-15 to +15 1.542 vs 0.881 P <0,0001), while b* does not vary significantly (b* from-15 to +15 2.345 vs 0.687 P <2.2387). The ANOVA statistical test confirmed the presence of statistically significant relationships between L*c, b*c, and lower-15° to predict L*l values. The results have confirmed the significant relationship between brightness, color, and proclination/retroclination of upper incisors and how orthodontic treatment can bring about significant changes in perceived color, especially in Class II Division 2 cases. Transitioning from-15 to 0 degrees emphasizes the possibility of an additional beneficial effect in treating this malocclusion.
Rizzo, F., Ceraulo, S., Medici, E. (2024). Aesthetic Evaluation of the Influence of Torque on the Color of Upper Incisors. EUROPEAN JOURNAL OF MUSCULOSKELETAL DISEASES, 13(1), 50-57.
Aesthetic Evaluation of the Influence of Torque on the Color of Upper Incisors
Ceraulo S.;
2024
Abstract
In cases of dental malocclusions with retroclined incisors, a darker smile may result since central incisors reflect less light. The purpose of this article is to assess if the degree of inclination of the four upper incisors can lead to changes in the brightness and color of the teeth and to evaluate the possibility of obtaining statistically significant data regarding the brightness of the lateral incisors using data from central incisors. A total of 40 subjects aged between 23 and 33 were selected. Three consecutive photos were taken for each individual at three different angles (0, 15,-15), referencing the Frankfurt Plane, to simulate torque movements of the anterior teeth. The photos in JPEG format produced integer RGB working data converted to CIE Lab* space with a standard CIE 2-degree observer. The selected area for color detection was at the center of the clinical crown of each tooth. When the head is inclined upward, all L*, a*, and b* change significantly in the overall transition from-15 to +15 for central incisors (L* from-15 to +15 50.293 vs 66.955 P<0.0001; a* from-15 to +15 0.896 vs 0.244 P<0.0001; b* from-15 to +15 2.239 P <0.0001) as for the lateral incisors, L* and a* change significantly in the overall transition from-15 to +15 (L* from-15 to +15 42.887 vs 59.386 P<0,0001; a* from-15 to +15 1.542 vs 0.881 P <0,0001), while b* does not vary significantly (b* from-15 to +15 2.345 vs 0.687 P <2.2387). The ANOVA statistical test confirmed the presence of statistically significant relationships between L*c, b*c, and lower-15° to predict L*l values. The results have confirmed the significant relationship between brightness, color, and proclination/retroclination of upper incisors and how orthodontic treatment can bring about significant changes in perceived color, especially in Class II Division 2 cases. Transitioning from-15 to 0 degrees emphasizes the possibility of an additional beneficial effect in treating this malocclusion.
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