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Arrested eruption of the permanent lower second molar
H Vedtofte1, J O Andreasen, I Kjaer
1Department of Orthodontics, School of Dentistry, University of Copenhagen, Denmark.
European Journal of Orthodontics
|April 7, 1999
Summary
Arrested eruption of the permanent lower second molar (M2inf) is linked to specific craniofacial traits, including a Class II jaw relationship and increased dental anomalies. Understanding these factors aids in better diagnosis and treatment planning for impacted M2inf.
Area of Science:
- Dentistry
- Orthodontics
- Craniofacial Biology
Background:
- The incidence of permanent lower second molar (M2inf) retention or impaction is between 0.6/1000 and 3/1000.
- Arrested tooth eruption requires further investigation into associated craniofacial and dental characteristics.
Purpose of the Study:
- To investigate craniofacial morphology, dental anomalies, and tooth inclination in patients with arrested M2inf eruption.
- To elucidate the etiology of arrested tooth eruption and characterize affected patients for improved diagnosis and treatment planning.
Main Methods:
- Analysis of radiographic materials (profile radiographs and orthopantomograms) from 19 patients (9 female, 10 male) aged 13-19 years at referral.
- Cephalometric analysis performed on radiographs taken between ages 8 and 16 years.
Main Results:
- Patients exhibited an increased Class II sagittal jaw relationship compared to a reference group.
- Observed were reduced mandibular prognathism, smaller mandibular gonial angle, enlarged mandibular alveolar prognathism, and less maxillary incisor inclination.
- Increased frequency of morphological tooth anomalies (root deflections, invaginations, taurodontism) was noted; no M2inf impaction cases showed lower third molar agenesis.
Conclusions:
- Craniofacial morphology and dental deviations are associated with arrested M2inf eruption.
- Evaluation of these conditions is crucial for future diagnosis and treatment planning in patients with arrested M2inf eruption.