Aberrant tooth positions--such as infraocclusion, mesially ectopic maxillary first molar, palatally displaced canine, tooth transposition, and tooth rotation--are gaining attention as variables in a putative, genetically related pattern of dental anomalies. This study, using panoramic roentgenograms, was undertaken to measure the angular position of the unerupted mandibular second premolar (MnP2) in children. The experimental subjects were 17 children with an unerupted MnP2 and agenesis of the other MnP2, a likely indicator of site-specific genetic disturbance. An age/sex-matched control-reference group was similarly measured for comparison. The hypothesis tested was that the unerupted, developing MnP2 teeth in the experimental subjects would show measurably greater malpositions than those of the control sample. The results indicated a 10 degrees increase in distoangular inclination for the unerupted MnP2 in the agenesis sample; this was a highly significant difference statistically (P = .003), compared with the MnP2 inclinations in the control sample. These findings, associating exaggerated distoangular malposition of the unerupted MnP2 in children with agenesis of the contralateral MnP2, identify a new phenotype of dental developmental disturbance to add to the accumulated evidence supporting shared genetic mechanisms for dental anomaly patterns.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1067/mod.2002.120399 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Mesiodistal angulation and developmental stages of unerupted mandibular second premolars in nonsyndromic oligodontia.
Am J Orthod Dentofacial Orthop
December 2023
Department of Orthodontics, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan. Electronic address:
Introduction: Oligodontia is a serious developmental dental anomaly that requires long-term multidisciplinary treatment, but its clinical characteristics are not well understood because it is rare. This study evaluated the mesiodistal angulation and developmental stages of unerupted mandibular second premolars (MnP2s) in orthodontic patients with nonsyndromic oligodontia.
Methods: Thirty-seven patients with oligodontia with at least 1 unerupted MnP2 in Demirjian's developmental stages between D and G were selected.
Comparison of the Angulation of the Unerupted Mandibular Second Premolar in Turkish Population with Tooth Agenesis.
Turk J Orthod
December 2019
Department of Orthodontics, Süleyman Demirel University School of Dentistry, Isparta, Turkey.
Objective: This study aimed to evaluate the unerupted mandibular second premolar (MnP2) angulation in individuals with different tooth agenesis in Turkish population.
Methods: We retrospectively reviewed panoramic radiographs of patients treated at Akdeniz University. According to the agenesis, the subjects were categorized into three groups: 22 patients with unilateral MnP2 agenesis (Group 1), 22 patients with bilateral mandibular incisor agenesis (MnI, Group 2), and 22 patients with no agenesis excluding third molars (Group 3).
Mesiodistal inclination of the unerupted second premolar in the mandible of Japanese orthodontic patients with incisor agenesis.
Angle Orthod
November 2015
b Professor and Chair, Department of Orthodontics, School of Life Dentistry at Tokyo, Nippon Dental University, Tokyo, Japan.
Objective: To elucidate the mesiodistal inclination of the unerupted mandibular second premolar (MnP2) in cases of mandibular incisor (MnIc) agenesis and unilateral MnP2 agenesis.
Materials And Methods: Twenty-two cases of unilateral MnP2 agenesis (MnP2 agenesis group) and a control group (control group A) of 22 cases without permanent tooth agenesis excluding third molars were selected. Thirty-six cases of MnIc agenesis (MnIc agenesis group) and another control group (control group B) of 36 subjects were also selected.
Dental anomaly pattern (DAP): agenesis of mandibular second premolar, distal angulation of its antimere and delayed tooth formation.
Angle Orthod
January 2014
a Graduate student, Department of Orthodontics, Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain.
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.
Malposition of unerupted mandibular second premolar in children with palatally displaced canines.
Angle Orthod
July 2009
Department of Orthodontics, Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel.
Objective: To test the hypotheses that (1) the distal angulation of unerupted mandibular premolar (MnP2) is significantly greater in children with palatally displaced canines (PDC) than in those in a control sample; and (2) delayed tooth formation is significantly more frequent in children with both malposed MnP2 and PDC than in children with PDC only.
Materials And Methods: We examined retrospectively panoramic radiographs from 43 patients with PDC who had no previous orthodontics. A control sample consisted of age- and sex-matched patients.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!