Association between mesially displaced maxillary first premolars and early displaced maxillary canines

作者：Mucedero M^*; Franchi L; Ricchiuti M R; Cozza P

来源：European Journal of Paediatric Dentistry, 2015, 16(1): 45-50.

• Association of dental anomalies
• Dental anomalies
• Displaced maxillary permanent canine
• Mesially displaced maxillary first premolars
• Panoramic radiograph

Aim To evaluate the association between the mesially displaced maxillary first premolar (MDP) and the early displacement of the adjacent permanent canine (EDC) before their eruption.
Materials and methods A sample of 1247 subjects in the intermediate mixed dentition stage was assessed for the presence of MOP and EDC. All subjects were divided into two groups: MDP group and noMDP group. For each subject two angular measurements (premolar-occlusal plane eta and Pi premolar-midline angles) were analysed on panoramic radiographs. The chi-square test with Yates correction was performed to compare the prevalence rate of EDC in MOP (MDP-EDC) and noMDP groups. The statistical comparisons for the values of and pi angles between MDP vs noMDP, MDP vs MDP-EDC, and noMDP vs MDP-EDC groups were performed by means of ANOVA with Bonferroni correction.
Results The prevalence rate of EDC in the MOP group was significantly greater than in the noMDP group (66% vs. 12.1%). MDP-EDC group showed a significantly larger Pi angle than in the MOP group resulting in an increased mesial inclination of displaced premolars.
Conclusion MDP can be considered a dental anomaly associated to maxillary canine displacement.

• 出版日期2015-3