Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups
| Autor: | Miroslav Andric, Aleksandar Jakovljevic, Emira Lazic, Ivan Soldatovic, Nenad Nedeljkovic |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Molar
Adult Male Adolescent Cephalometry Radiography Radiographic predictors Dentistry Orthodontics Mandible Malocclusion Angle Class II Tooth Eruption Mandibular second molar 03 medical and health sciences Young Adult 0302 clinical medicine stomatognathic system Age related Radiography Panoramic medicine Maxilla Humans Nasal Bone 030212 general & internal medicine Tooth Crown business.industry Impaction Age Factors Tooth Impacted 030206 dentistry Radiography Dental Digital Original Articles Sagittal plane Lower third molar medicine.anatomical_structure Mandibular prognathism Malocclusion Angle Class III Retromolar space Prognathism Female Molar Third business Malocclusion |
| Zdroj: | Angle Orthod Angle Orthodontist |
| ISSN: | 1945-7103 |
| Popis: | Objective: To analyze radiographic predictors for lower third molar eruption among subjects with different anteroposterior skeletal relations and of different age groups. Materials and Methods: In total, 300 lower third molars were recorded on diagnostic digital orthopantomograms (DPTs) and lateral cephalograms (LCs). The radiographs were grouped according to sagittal intermaxillary angle (ANB), subject age, and level of lower third molar eruption. The DPT was used to analyze retromolar space, mesiodistal crown width, space/width ratio, third and second molar angulation (α, γ), third molar inclination (β), and gonion angle. The LC was used to determine ANB, angles of maxillar and mandibular prognathism (SNA, SNB), mandibular plane angle (SN/MP), and mandibular lengths. A logistic regression model was created using the statistically significant predictors. Results: The logistic regression analysis revealed a statistically significant impact of β angle and distance between gonion and gnathion (Go-Gn) on the level of lower third molar eruption (P < .001 and P < .015, respectively). The retromolar space was significantly increased in the adult subgroup for all skeletal classes. The lower third molar impaction rate was significantly higher in the adult subgroup with the Class II (62.3%) compared with Class III subjects (31.7%; P < .013). Conclusion: The most favorable values of linear and angular predictors of mandibular third molar eruption were measured in Class III subjects. For valid estimation of mandibular third molar eruption, certain linear and angular measures (β angle, Go-Gn), as well as the size of the retromolar space, need to be considered. |
| Databáze: | OpenAIRE |
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