Delayed dental maturity in dentitions with agenesis of mandibular second premolars

TY - JOUR

T1 - Delayed dental maturity in dentitions with agenesis of mandibular second premolars

AU - Daugaard, S

AU - Christensen, I J

AU - Kjaer, I

N1 - © 2010 John Wiley & Sons A/S.

PY - 2010/11/1

Y1 - 2010/11/1

N2 - Objectives - To evaluate dental maturity in the mandibular canine/premolar and molar innervation fields in children with agenesis of the 2nd mandibular premolar and to associate these findings with normal control material. Setting and Sample Population - Department of Orthodontics, Institute of Odontology, University of Copenhagen. Eighty-three panoramic radiographs (27 girls and 31 boys with agenesis of one mandibular 2nd premolar and 17 girls and eight boys with agenesis of both mandibular 2nd premolars) represented all mandibular second premolar agenesis cases from a material of 2847 radiographs. Material and Methods - On each radiograph, dental maturity of all available mandibular premolars, canines and 2nd molars was evaluated and categorized in maturity stages according to Haavikko whose material served as control material. Descriptive statistics given by sample mean, standard deviation and range for each tooth stratified by gender and agenesis. Ninety-five percentage confidence limits and T-statistics were used. p-values <5% were considered significant. Results - In unilateral agenesis, the canines are specifically delayed in both girls and boys, with a larger delay in girls (p = 0.009). The second molar is not delayed in boys (p = 0.98) but is in girls (p = 0.04). The differences in delay for the canine compared to the second molar are significant for both girls and boys. The results show a considerable delay in tooth maturation within the canine/premolar innervation field predominantly in girls. The 2nd molar is delayed in girls but not in boys.

AB - Objectives - To evaluate dental maturity in the mandibular canine/premolar and molar innervation fields in children with agenesis of the 2nd mandibular premolar and to associate these findings with normal control material. Setting and Sample Population - Department of Orthodontics, Institute of Odontology, University of Copenhagen. Eighty-three panoramic radiographs (27 girls and 31 boys with agenesis of one mandibular 2nd premolar and 17 girls and eight boys with agenesis of both mandibular 2nd premolars) represented all mandibular second premolar agenesis cases from a material of 2847 radiographs. Material and Methods - On each radiograph, dental maturity of all available mandibular premolars, canines and 2nd molars was evaluated and categorized in maturity stages according to Haavikko whose material served as control material. Descriptive statistics given by sample mean, standard deviation and range for each tooth stratified by gender and agenesis. Ninety-five percentage confidence limits and T-statistics were used. p-values <5% were considered significant. Results - In unilateral agenesis, the canines are specifically delayed in both girls and boys, with a larger delay in girls (p = 0.009). The second molar is not delayed in boys (p = 0.98) but is in girls (p = 0.04). The differences in delay for the canine compared to the second molar are significant for both girls and boys. The results show a considerable delay in tooth maturation within the canine/premolar innervation field predominantly in girls. The 2nd molar is delayed in girls but not in boys.

KW - Adolescent

KW - Age Determination by Teeth

KW - Anodontia

KW - Bicuspid

KW - Child

KW - Cuspid

KW - Denmark

KW - Female

KW - Humans

KW - Male

KW - Mandible

KW - Molar

KW - Odontogenesis

KW - Radiography, Panoramic

KW - Sex Factors

KW - Time Factors

KW - Tooth Apex

KW - Tooth Crown

KW - Tooth Eruption

KW - Tooth Root

U2 - 10.1111/j.1601-6343.2010.01490.x

DO - 10.1111/j.1601-6343.2010.01490.x

M3 - Journal article

C2 - 21040461

SN - 1601-6335

VL - 13

SP - 191

EP - 196

JO - Clinical orthodontics and research

JF - Clinical orthodontics and research

IS - 4

ER -