Variant root morphology of third mandibular molar in normal and impacted teeth
| Autor: | FG Macigo, Isaac Kipyator Bokindo, Fawzia Butt |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Pulmonary and Respiratory Medicine
Molar Orthodontics Root morphology Dentition Impaction business.industry Mandible Mandibular canal 030206 dentistry Inferior alveolar nerve 030218 nuclear medicine & medical imaging stomatognathic diseases 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure stomatognathic system Third molar root morphology impaction Medicine Pediatrics Perinatology and Child Health business Mandibular molar |
| Zdroj: | Anatomy Journal of Africa; Vol 6, No 3 (2017): Supplementary Issue; 1052-1061 |
| ISSN: | 2305-9478 2226-6054 |
| Popis: | The mandibular third molar poses a challenge to dental surgeons due to it’s unpredictable morphology which leads to increased difficulty during its extraction. The root morphology of the third molar is considered to be the most variable in the human dentition. The study aims to document these variations which will be useful while undertaking procedures on the third molar. Three hundred and fifty nine panoramic views of the mandible were obtained from the Radiology division for patients seeking treatment in the School of Dental Sciences since 2010. The prevalence of third molar impaction was found to be 27%, with mesioangular being the commonest at 21.9% using the Winter’s classification. Dilacerations of roots was recorded at 44%, with a ratio of normal to dilacerated of 1:1 seen in impacted teeth while, non impacted teeth had a ratio of 1.3:1. Most teeth had 2 roots (85.5%), with one root seen in 12.1%. Partially fused roots was also observed in 2.4% of cases with only one case showing three roots. The total mean distance from the tips of roots to the mandibular canal was -0.5mm. Higher negative means of -1.5mm was recorded in impacted teeth than in normal teeth (-0.2mm). Teeth with dilacerated roots also showed closer proximity to mandibular canal than straight rooted teeth. The left side of the jaw also showed higher negative means. Present findings suggest that careful considerations should be made on impacted teeth. In addition to the type of impaction, proximity to the inferior alveolar nerve (IAN), number of roots and shape of the roots should be assessed. Similar considerations should also be made to non impacted teeth due to the high unpredictability observed in root morphology.Keywords: Third molar, root morphology, impaction |
| Databáze: | OpenAIRE |
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