Objective: To test the null hypotheses that children with unilateral agenesis of the mandibular second premolar (MnP2) do not show (1) greater distal angulation of the unerupted antimere and (2) delayed tooth formation compared with children without agenesis. Materials and Methods: Panoramic radiographs of 38 patients with unilateral aplasia of MnP2 were retrospectively examined and compared to a non-agenesic control group of 82 patients. Ages ranged from 8 to 15 years. Contralateral mandibular deciduous second molars were present for all participants. Each unerupted MnP2 was traced, and its developmental stage and angulation were recorded (measured with the distal angle and the premolar-molar angle). Dental age was evaluated using the Haavikko method. Student's t-test was performed to identify significant differences between the compared groups. The significance level for statistical testing was set at P , .05. Results: The results indicated a 9.5u decrease in the distal angle and a 13.2u increase in the premolar-molar angle for the unerupted MnP2 in the agenesis sample. This was a highly statistically significant difference (P , .001 and P , .0001, respectively) compared with the MnP2
Objective: The purpose of this study was to assess craniofacial growth In children from 10 months to 5 years of age with cleft lip and/or palate and to develop a systematic method of cephalometric measurements. Design: A case-control study. Setting: Craniofacial unit of a teaching hospital for children. Patients: A consecutive series of the first 22 patients with cleft lip and/or palate who underwent early reconstructive treatment [isolated cleft lip (CL) 6; isolated cleft palate (CP) 7; unilateral cleft lip and palate (UCLP) 7; and bilateral complete cleft lip and palate (BCLP) 2] (mean age, 27.9 months) and 22 age- and sex-matched noncleft children. Interventions: Lateral cephalometric headfilms of the children were taken using a pediatric cephalostat. Main Outcome Measures: Cephalometric landmarks were measured according to Ricketts cephalometry. Results: As compared with controls, CL patients had a lingual position and inclination of maxillary and mandibular incisors, an increase of interincisal angle and a decrease of incisor overjet, an increase in facial convexity, and a decrease in facial depth and mandible body length. In CP patients, palatal plane inclination and mandible arch were significantly reduced. In UCLP patients, there was a decrease in molar relation and incisor overbite, an increase in interincisal angle, reduced position and inclination of maxillary incisors and inclination of mandibular incisors, an increase in facial convexity, and lower facial height. Conclusions: Based on the absence of midface growth reduction, these short-term results suggest a tendency toward normal maxillomandibular growth.
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