Mesiodistal root angulation of permanent teeth in children with mixed dentition and normal occlusion

OBJECTIVE: There is little information regarding the mesiodistal angulation of permanent teeth in mixed dentition. The aim of this study was to evaluate mesiodistal root angulation of permanent incisors, canines and first molars of 100 Brazilian children, using a new horizontal reference plane based on the midpoint of the intercuspation of primary canines and permanent first molars in panoramic radiographs during the mixed-dentition phase. MATERIAL AND METHODS: Children were equally divided between the genders with a mean age of 8.9 years (SD=0.76), normal occlusion and no eruptive disturbances. RESULTS: The angulation of the permanent maxillary first molars was close to the vertical, whereas the mandibular molars presented approximately 25 degrees of distal root angulation. The maxillary canines were the most distally angulated teeth, whereas the permanent mandibular canines were vertically positioned. The evaluation of the anterior maxillary area showed vertical position of permanent lateral, and central incisors with a slight distal angulation, whereas the permanent mandibular incisors tended to a mesial radicular convergence. CONCLUSIONS: The proposed reference line could be useful in mixed dentition root angulation evaluation; there was a slight asymmetry in the mesiodistal angulation among homologous teeth, and also a small variation between the male and the female groups, but no difference between 8-and 10-year-old children.

Mesiodistal root angulation of permanent teeth in children with mixed dentition and normal occlusion.

OBJECTIVE: There is little information regarding the mesiodistal angulation of permanent teeth in mixed dentition. The aim of this study was to evaluate mesiodistal root angulation of permanent incisors, canines and first molars of 100 Brazilian children, using a new horizontal reference plane based on the midpoint of the intercuspation of primary canines and permanent first molars in panoramic radiographs during the mixed-dentition phase. MATERIAL AND METHODS: Children were equally divided between the genders with a mean age of 8.9 years (SD=0.76), normal occlusion and no eruptive disturbances. RESULTS: The angulation of the permanent maxillary first molars was close to the vertical, whereas the mandibular molars presented approximately 25 degrees of distal root angulation. The maxillary canines were the most distally angulated teeth, whereas the permanent mandibular canines were vertically positioned. The evaluation of the anterior maxillary area showed vertical position of permanent lateral, and central incisors with a slight distal angulation, whereas the permanent mandibular incisors tended to a mesial radicular convergence. CONCLUSIONS: The proposed reference line could be useful in mixed dentition root angulation evaluation; there was a slight asymmetry in the mesiodistal angulation among homologous teeth, and also a small variation between the male and the female groups, but no difference between 8-and 10-year-old children.

Angulação radicular mesiodistal de caninos permanentes em crianças com fissura unilateral completa de lábio e palato / Mesiodistal root angulation of permanent canines in children with unilateral cleft lip and palate

Objetivo: analisar a influência da fissura unilateral completa de lábio e palato (FUCLP) na angulação mesiodistal dos caninos permanentes durante a dentadura mista. Material e método: Trinta radiografias panorâmicas de crianças (21 masculino e 9 feminino) com média de idade de 8 anos e 11 meses (oscilando de 6 anos e 10 meses a 10 anos e 4 meses) portadoras de FUCLP, com apenas cirurgias primárias de lábio e palato realizadas, foram retrospectivamente selecionadas. A angulação radicular mesiodistal, dos caninos permanentes superiores (no lado fissurado e não-fissurado) e inferiores, foi mensurada com referência ao plano oclusal. As diferenças entre os gêneros, entre os lados fissurado e não-fissurado na maxila e entre os lados direito e esquerdo na mandíbula foram analisadas estatisticamente pelo teste t não pareado. Resultados: Os resultados obtidos indicaram a ausência de interferência do gênero (P>0,05) e apontaram para uma significante assimetria na angulação radicular mesiodistal do canino superior no lado fissurado (P=0,001). Conclusão: Conclui-se que a FUCLP interferiu na angulação radicular mesiodistal do canino superior adjacente à fissura.

The aim of this study was to analyze the influence of unilateral cleft lip and palate (UCLP) in mesiodistal angulation of the permanent canines in the mixed dentition. Thirty panoramic radiographs of children (21 male and 9 female) with mean age of 8 years and 11 months (ranging from 6 years and 10 months to 10 years and 4 months), with UCLP with only primary lip and palate surgeries performed, were retrospectively selected. The mesiodistal root angulation of the maxillary permanent canines (the cleft and non-cleft sides) and mandibular were measured with reference to the occlusal plane. The differences between genders, between the cleft and non-cleft sides and between right and left jaw were statistically analyzed by unpaired t test. The results indicated no influence of gender (P> 0.05) and pointed to a significant asymmetry in mesiodistal root angulation of the maxillary canine on the cleft side (P = 0.001). We conclude that the UCLP influenced mesiodistal root angulation of the maxillary canine adjacent to the cleft.