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

• Published in: European journal of paediatric dentistry Vol. 16; no. 1; pp. 45 - 50
• Main Authors: Mucedero, M, Franchi, L, Ricchiuti, M R, Cozza, P
• Format: Journal Article
• Language: English
• Published: Italy 01.03.2015
• Subjects: Bicuspid - diagnostic imaging; Cephalometry - methods; Child; Cuspid - diagnostic imaging; Dentition, Mixed; Female; Humans; Italy - epidemiology; Male; Maxilla - diagnostic imaging; Odontogenesis - physiology; Odontometry - methods; Prevalence; Radiography, Panoramic; Tooth Eruption, Ectopic - epidemiology; Tooth Germ - diagnostic imaging; Tooth, Unerupted - diagnostic imaging
• ISSN: 1591-996X

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. A sample of 1247 subjects in the intermediate mixed dentition stage was assessed for the presence of MDP and EDC. All subjects were divided into two groups: MDP group and noMDP group. For each subject two angular measurements (premolar-occlusal plane η and л 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 MDP (MDP-EDC) and noMDP groups. The statistical comparisons for the values of η and л angles between MDP vs noMDP, MDP vs MDP-EDC, and noMDP vs MDP-EDC groups were performed by means of ANOVA with Bonferroni correction. The prevalence rate of EDC in the MDP group was significantly greater than in the noMDP group (66% vs. 12.1%). MDP-EDC group showed a significantly larger л angle than in the MDP group resulting in an increased mesial inclination of displaced premolars. MDP can be considered a dental anomaly associated to maxillary canine displacement.