A Radıographıc Evaluatıon of Thırd-Molar Agenesıs and Assocıated Dental Anomalıes a Group of Tur- kısh Populatıon

Abstract

The aim of this study was to investigate the frequency of dental anomalies in a Turkish population with different patterns of third-molar agenesis, comparing them with patients without thirdmolar agenesis. A sample of 1552 patients with agenesis of at least 1 third molar was divided into 4 groups according to the third-molar agenesis pattern, and a control group of 402 patients without third-molar agenesis was randomly selected from the Erciyes University-Oral and Maxillo Facial Radiology archives. Panoramic radiographs were used to determine the associated dental anomalies, such as hypodontia, hyperdontia, impaction, dilaceration, microdontia, ectopic eruption, transposition, and transmigration. The Pearson chi-square and Fisher exact tests were used to determine the differences in the distribution of the associated dental anomalies among the groups. When we compared the groups according to the various third-molar agenesis patterns, we found that agenesis of other teeth was more common in patients with agenesis of 3 and 4 third molars. Additionally, the patients with agenesis of 4 third molars exhibited maxillary lateral-incisor microdontia more frequently. Another important finding was a higher prevalence of total dental anomalies in patients with agenesis of 3 and 4 third molars compared with the control group. Permanent tooth agenesis, microdontia of maxillary lateral incisors, and total dental anomalies are more frequently associated with agenesis of 4 third molars than with the presence of third molars.

Keywords

• Dental anomalies, tooth agenesis, panoramic radiography

Bir grup Türk popülasyonunda üçüncü molar eksikliği ile ilişkili dental anomalilerin radyografik olarak değerlendirilmesi

Abstract

Bu çalışmanın amacı, bir grup Türk popülasyonunda farklı üçüncü molar agenezisi paternleri varlığındaki dental anomalileri, üçüncü molar agenezisi olmayan hastalarla karşılaştırmaktır. En az 1 adet üçüncü molar agenezisi olan 1552 hasta, üçüncü molar agenezisi paternine göre 4 gruba ayrılmış ve üçüncü molar agenezisi olmayan 402 hasta ise kontrol grubu olarak Erciyes Üniversitesi Ağız, Diş ve Çene Radyolojisi arşivinden rastgele seçilmiştir. Panoramik radyograflar hipodonti, hiperdonti, gömülü kalma, dilaserasyon, mikrodonti, ektopik erüpsiyon, transpozisyon ve transmigrasyon gibi dental anomalileri belirlemek için kullanılmıştır. Pearson ki-kare ve Fisher exact testleri, gruplar arasındaki dental anomalilerin dağılımındaki farklılıkları belirlemek için kullanılmıştır. Farklı üçüncü molar agenezisi paternlerine göre grupları karşılaştırdığımızda, 3 ve 4 adet üçüncü molar agenezisi olan hastalarda, diğer daimi dişlerde de daha fazla oranda agenezis tespit ettik. Ayrıca, 4 tane üçüncü molar agenezisi olan hastalar daha yüksek oranda maksiller lateral keser dişlerde mikrodontik yapı gösteriyorlardı. Diğer önemli bir bulgu da, kontrol grubu ile karşılaştırıldığında 3 ve 4 adet üçüncü molar agenezisi bulunan hastalarda toplam dental anomali prevalansının yüksek olmasıdır. Daimi diş eksikliği, maksiller lateral keserlerin mikrodontik yapıları ve total dental anomaliler tüm üçüncü molarların agenezisinin üçüncü molarların tam olduğu durumlardan daha sık oranda gözlenmektedir.

Keywords

• Dental anomaliler, diş eksikliği, panoramik radyografi

References

1. Celikoglu M, Kazanci F, Miloglu O, Oztek O, Kamak H, Ceylan I. Frequency and characteristics of tooth agenesis among an ort- hodontic patient population. Med Oral Patol Oral Cir Bucal 2010;15 e797-801.
2. Chung CJ, Han JH, Kim KH. The pat- tern and prevalence of hypodontia in Koreans. Oral Dis 2008;14:620-5.
3. Harris EF, Clark LL. Hypodontia: an epidemiologic study of American black and white people. Am J Orthod Dentofacial Orthop 2008;134:761-7.
4. Albashaireh ZS, Khader YS. The pre- valence and pattern of hypodontia of the per- manent teeth and crown size and shape defor- mity affecting upper lateral incisors in a samp- le of Jordanian dental patients. Community Dent Health 2006;23:239-43.
5. Nordgarden H, Jensen JL, Storhaug K. Reported prevalence of congenitally missing teeth in two Norwegian counties. Community Dent Health 2002;19:258-61
6. Larmour CJ, Mossey PA, Thind BS, Forgie AH, Stirrups DR. Hypodontia—a ret- rospective review of prevalence and etiology. Part I. Quintessence Int 2005:36(4):263-70.
7. Celikoglu M, Miloglu O, Kazanci F. Frequency of agenesis, impaction, angulation, and related pathologic changes of thirdmolar teeth in orthodontic patients. J Oral Maxillofac Surg 2010;68:990-5.
8. Kruger E, Thomson WM, Konthasing- he 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.

9. Lavelle CL, Ashton EH, Flinn RM. Cusp pattern, tooth size and third molar agene- sis in the human mandibular dentition. Arch Oral Biol 1970;15:227-37.
10. Baba-Kawano S, Toyoshima Y, Rega- lado L, Sa’do B, Nakasima A. Relationship between congenitally missing lower third mo- lars and late formation of tooth germs. Angle Orthod 2002;72:112-7.
11. Nanda RS. Agenesis of the third molar in man. Am J Orthod 1954; 40:698-706.
12. Leco Berrocal MI, Martin Morales JF, Martinez Gonzalez JM. An observational study of the frequency of supernumerary teeth in a population of 2000 patients. Med Oral Patol Oral Cir Bucal 2007;12:E134-8.
13. Seow WK and Lai P.W. Association of Taurodontism with hypodontia. A controlled study. Ped Dentistry 1989; 11:214-219.
14. Becker A. The orthodontic treatment of impacted teeth. 2nd ed. Jerusalem: Informa Healthcare; 2007. p. 3.
15. Peck L, Peck S, Attia Y. Maxillary canine-first premolar transposition, associated dental anomalies and genetic basis. Angle Ort- hod 1993;63:99-109.
16. Hamasha AA, Al-Khateeb T, Darwa- zeh A. Prevalence of dilaceration in Jordanian adults. Int Endod J 2002;35:910-2
17. Langlais RP, Langland OE, Nortje CJ. Development and acquired abnormalities of the teeth and jaws. In: Langlais RP, Langland OE, Nortje CJ, editors. Diagnostic Imaging of the Jaws. Baltimore: Williams & Wilkins; 1995. p. 103-62.
18. Garib DG, Peck S, Gomes SC. Increa- sed occurrence of dental anomalies associated with second-premolar agenesis. Angle Orthod 2009;79:436-41.
19. Hattab FN, Yassin OM, al-Nimri KS. Talon cuspdclinical significance and manage- ment: 1995;26:115e20. Quintessence Int
20. Massler M, Schour I, Poncher HG. Developmental pattern of the child as reflected in the calcification pattern of the teeth. Am J Dis Child 1941;62:33-67.
21. Garn SM, Lewis AB, Vicinus JH. Third molar agenesis and reduction in the number 1962;41:717. teeth. J Dent Res
22. Banks HV. Incidence of third molar development. Angle Orthod 1934;4:223-33.
23. Barnett DP. Late development of a lower third molar: a case report. Br J Orthod 1976;3:111-2.
24. Richardson ME. Late third molar ge- nesis: its significance in orthodontic treatment. Angle Orthod 1980;50:121-8.
25. Shah RM, Boyd MA. The relationship between presence and absence of third molars hypodontia of other teeth. J Dent Res 1979;58:544.
26. Jorgenson RJ. Clinician’s view of hy- podontia. J Am Dent Assoc 1980;101:283-6.
27. Abe R, Endo T, Shimooka S. Maxil- lary first molar agenesis and other dental ano- malies. Angle Orthod 2010;80:1002-9.