Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Position of impacted mandibular third molar in different skeletal facial types: First radiographic evaluation in a group of Iranian patients

  • Shokri, Abbas (Department of Oral and Maxillofacial Radiology, Dental School, Hamadan University of Medical Sciences) ;
  • Mahmoudzadeh, Majid (Department of Orthodontics, Dental School, Hamadan University of Medical Sciences) ;
  • Baharvand, Maryam (Department of Oral Medicine, Dental School, Shahid Beheshti University of Medical Sciences) ;
  • Mortazavi, Hamed (Department of Oral Medicine, Dental School, Shahid Beheshti University of Medical Sciences) ;
  • Faradmal, Javad (Department of Epidemiology and Statistics, Medical School, Hamadan University of Medical Sciences) ;
  • Khajeh, Samira (Department of Oral and Maxillofacial Radiology, Dental School, Hamadan University of Medical Sciences) ;
  • Yousefi, Faezeh (Department of Oral and Maxillofacial Radiology, Dental School, Hamadan University of Medical Sciences) ;
  • Noruzi-Gangachin, Maruf (Department of Oral and Maxillofacial Radiology, Dental School, Hamadan University of Medical Sciences)
  • Received : 2013.07.25
  • Accepted : 2013.09.01
  • Published : 2014.03.31
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Abstract

Purpose: This study was performed to evaluate the position of impacted mandibular third molars in different skeletal facial types among a group of Iranian patients. Materials and Methods: A total of 400 mandibular third molars in 200 subjects with different types of facial growth were radiographically investigated for their positions according to their types of facial growth on the basis of the ${\beta}$ angle. The subjects were divided into three groups (class I, II, and III) according to ANB angle, representing the anteroposterior relationship of the maxilla to the mandible. Meanwhile, the subjects were also divided into three groups (long, normal, and short face) according to the angle between the stella-nasion and mandibular plane (SNGoGn angle). ANOVA was used for statistical analysis. Results: The mean ${\beta}$ angle showed no significant difference among class I, II, and III malocclusions (df=2, F=0.669, p=0.513). The same results were also found in short, normal, and long faces (df=1.842, F=2, p=0.160). The mesioangular position was the most frequent one in almost all of the facial growth patterns. Distoangular and horizontal positions of impaction were not found in the subjects with class III and normal faces. In the long facial growth pattern, the frequency of vertical and distoangular positions were not different. Conclusion: In almost all of the skeletal facial types, the mesioangular impaction of the mandibular third molar was the most prevalent position, followed by the horizontal position. In addition, ${\beta}$ angle showed no significant difference in different types of facial growth.

Keywords

References

  1. Abu Alhaija ES, AlBhairan HM, AlKhateeb SN. Mandibular third molar space in different antero-posterior skeletal patterns. Eur J Orthod 2011; 33: 570-6. https://doi.org/10.1093/ejo/cjq125
  2. Breik O, Grubor D. The incidence of mandibular third molar impactions in different skeletal face types. Aust Dent J 2008; 53: 320-4. https://doi.org/10.1111/j.1834-7819.2008.00073.x
  3. Hattab FN, Rawashdeh MA, Fahmy MS. Impaction status of third molars in Jordanian students. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1995; 79: 24-9. https://doi.org/10.1016/S1079-2104(05)80068-X
  4. Hugoson A, Kugelberg CF. The prevalence of third molars in a Swedish population. An epidemiological study. Community Dent Health 1988; 5: 121-38.
  5. Mady Maricic B, Legovic M, Slaj M, Lapter Varga M, Zuvic Butorac M, Kapovic M. Presence of third molar germs in orthodontic patients with class II/2 and class III malocclusions. Coll Antropol 2009; 33: 1171-5.
  6. Bjork A, Jensen E, Palling M. Mandibular growth and third molar impaction. Acta Odontol Scand 1956; 14: 231-72. https://doi.org/10.3109/00016355609019762
  7. Kaplan RG. Some factors related to mandibular third molar impaction. Angle Orthod 1975; 45: 153-8.
  8. Hattab FN, Alhaija ES. Radiographic evaluation of mandibular third molar eruption space. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1999; 88: 285-91. https://doi.org/10.1016/S1079-2104(99)70029-6
  9. Richardson ME. The etiology and prediction of mandibular third molar impaction. Angle Orthod 1977; 47: 165-72.
  10. Legovic M, Legovic I, Brumini G, Vandura I, Cabov T, Ovesnik M, et al. Correlation between the pattern of facial growth and the position of the mandibular third molar. J Oral Maxillofac Surg 2008; 66: 1218-24. https://doi.org/10.1016/j.joms.2007.12.013
  11. Tecco S, Caputi S, Tete S, Orsini G, Festa F. Electromyographic activity of masticatory, neck and trunk muscles of subjects with different mandibular divergence. A cross-sectional evaluation. Angle Orthod 2007; 77: 260-5. https://doi.org/10.2319/0003-3219(2007)077[0260:EAOMNA]2.0.CO;2
  12. Winter GB. Impacted mandibular third molars. St. Louis: American Medical Book; 1926. p. 241-79.
  13. Andreasen JO, Petersen JK, Laskin DM. Textbook and color atlas of tooth impactions: diagnosis, treatment, prevention. Copenhagen: Munksgaard; 1997. p. 222-3.
  14. Dachi SF, Howell FV. A survey of 3,874 routine full-mouth radiographs. I. A study of retained roots and teeth. Oral Surg Oral Med Oral Pathol 1961; 14: 916-24. https://doi.org/10.1016/0030-4220(61)90003-2
  15. Vilela EM, Vitoi PA. Study of position and eruption of lower third molars in adolescents. South Braz Dent J 2011; 8: 390-7.
  16. Quek SL, Tay CK, Tay KH, Toh SL, Lim KC. Pattern of third molar impaction in a Singapore Chinese population: a retrospective radiographic survey. Int J Oral Maxillofac Surg2003; 32: 548-52. https://doi.org/10.1016/S0901-5027(03)90413-9
  17. Sandhu S, Kaur T. Radiographic evaluation of the status of third molars in the Asian-Indian students. J Oral Maxillofac Surg 2005; 63: 640-5. https://doi.org/10.1016/j.joms.2004.12.014
  18. Ventä I, Turtola L, Ylipaavalniemi P. Radiographic follow-up of impacted third molars from age 20 to 32 years. Int J Oral Maxillofac Surg 2001; 30: 54-7. https://doi.org/10.1054/ijom.2000.0002
  19. Brown LH, Berkman S, Cohen D, Kaplan AL, Rosenberg M. A radiological study of the frequency and distribution of impacted teeth. J Dent Assoc S Afr 1982; 37: 627-30.
  20. Murtomaa H, Turtola L, Ylipaavalniemi P, Rytomaa I. Status of the third molars in the 20- to 21-year-old Finnish university population. J Am Coll Health 1985; 34: 127-9. https://doi.org/10.1080/07448481.1985.9939622
  21. Behbehani F, Artun J, Thalib L. Prediction of mandibular thirdmolar impaction in adolescent orthodontic patients. Am J Orthod Dentofacial Orthop 2006; 130: 47-55. https://doi.org/10.1016/j.ajodo.2006.03.002
  22. Uthman AT. Retromolar space analysis in relation to selected linear and angular measurements for an Iraqi sample. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2007; 104: e76-82. https://doi.org/10.1016/j.tripleo.2007.05.013
  23. Farzanegan F, Goya A. Evaluation of mandibular third molar positions in various vertical skeletal malocclusions. J Dent Mater Tech 2012; 1: 58-62.
  24. Richardson M. Changes in lower third molar position in the young adult. Am J Orthod Dentofacial Orthop 1992; 102: 320-7. https://doi.org/10.1016/0889-5406(92)70047-E
  25. Hattab FN. Positional changes and eruption of impacted mandibular third molars in young adults. A radiographic 4-year follow-up study. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1997; 84: 604-8. https://doi.org/10.1016/S1079-2104(97)90359-0
  26. Kruger E, Thomson WM, Konthasinghe P. Third molar outcomes from age 18 to 26: findings from a population-based New Zealand longitudinal study. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2001; 92: 150-5. https://doi.org/10.1067/moe.2001.115461
  27. Hesby RM, Marshall SD, Dawson DV, Southard KA, Casko JS, Franciscus RG, et al. Transverse skeletal and dentoalveolar changes during growth. Am J Orthod Dentofacial Orthop 2006; 130: 721-31 https://doi.org/10.1016/j.ajodo.2005.03.026

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