SEARCH WITHIN CONTENT
Citation Information : Australasian Orthodontic Journal. Volume 34, Issue 1, Pages 36-44, DOI: https://doi.org/10.21307/aoj-2020-057
License : (CC BY 4.0)
Published Online: 20-July-2021
Background: The aim of the present study was to assess sexual dimorphism related to occlusal variables recorded from dental casts of Australian twins and to compare trends across primary (T1), mixed (T2) and permanent (T3) dentitions in the same individuals.
Methods: The sample comprised 22 males and 25 females selected at random from monozygotic pairs and 19 males and 19 females from dizygotic pairs. Overjet, overbite, midline deviation, midline diastema, primary and permanent molar relationship, and primary and permanent canine relationships were measured in millimetres using a digital calliper.
Results: The mean values for overjet in males in the permanent dentition and for overbite in the mixed and permanent dentitions were significantly greater than those for females. The other occlusal traits showed no sexual dimorphism. Midline diastemata were most prevalent in the primary dentition while coincident midlines were most prevalent at all stages for both genders. In addition, a mesial step deciduous molar relationship was more prevalent on the right side and a flush terminal plane present on the left. Furthermore, a Class II permanent molar relationship was predominant in T1/T2, while a Class I relationship was most prevalent in the permanent dentition. Class II primary and permanent canine relationships were most common at all stages.
Conclusions: Significant sexual dimorphism was found for overjet and overbite at several occlusal developmental stages but sexual dimorphism was not found for the other occlusal traits studied.
1. Proffit W, Fields H, Sarver D. Contemporary Orthodontics. 4th edn. St Louis, Missouri: Mosby, 2007;502-10.
2. Moorrees CF, Gron AM, Lebret LM, Yen PK, Fröhlich FJ. Growth studies of the dentition: a review. Am J Orthod 1969;55:600-16.
3. Bishara SE, Jakobsen JR, Treder J, Nowak A. Arch length changes from 6 weeks to 45 years. Angle Orthod 1998;68:69-74.
4. Garn SM, Lewis AB, Kerewsky RS, Jegart K. Sex differences in intraindividual tooth-size communalities. J Dent Res 1965;44:476-9.
5. Moorrees C, Thomsen S, Jensen E, Yen P. Mesiodistal crown diameters of the deciduous and permanent teeth in individuals. J Dent Res 1957;36:39-47.
6. Dempsey PJ, Townsend GC. Genetic and environmental contributions to variation in human tooth size. Heredity 2001;86:685-93.
7. Dempsey PJ, Townsend GC, Martin NG, Neale MC. Genetic covariance structure of incisor crown size in twins. J Dent Res 1995;74:1389-98.
8. Harris EF, Lease LR. Mesiodistal tooth crown dimensions of the primary dentition: a worldwide survey. Am J Phys Anthrop 2005;128:593-607.
9. Garn SM, Lewis AB, Kerewsky RS. Sexual dimorphism in the buccolingual tooth diameter. J Dent Res 1966;45:1819.
10. Townsend GC, Pinkerton SK, Rogers JR, Bockmann MR, Hughes TE. Twin Studies: research in genes, teeth and faces. Adelaide, South Australia: University of Adelaide Press, 2015.
11. Hughes TE, Bockmann MR, Seow K, Gotjamanos T, Gully N, Richards LC et al. Strong genetic control of emergence of human primary incisors. J Dent Res 2007;86:1160-5.
12. Harris EF, Corruccini RS. Quantification of dental occlusal variation: a review of methods. Dental Anthrop 2008;21:1-11.
13. Harris EF, Bodford K. Bilateral asymmetry in the tooth relationships of orthodontic patients. Angle Orthod 2007;77:779-86.
14. Harris EF, Smith RN. Accounting for measurement error: a critical but often overlooked process. Arch Oral Biol 2009;54S:107-17.
15. Dahlberg G. Statistical methods for medical and biological students. London: George Allen and Unwin, 1940.
16. Hughes T, Thomas C, Richards L, Townsend G. A study of occlusal variation in the primary dentition of Australian twins and singletons. Arch Oral Biol 2001;46:857-64.
17. Brunelle JA, Bhat M, Lipton JA. Prevalence and distribution of selected occlusal characteristics in the US population, 1988-1991. J Dent Res 1996;75:706-13.
18. Heikinheimo K, Nyström M, Heikinheimo T, Pirttiniemi P, Pirinen S. Dental arch width, overbite, and overjet in a Finnish population with normal occlusion between the ages of 7 and 32 years. Eur J Orthod 2012;34:418-26.
19. Alvesalo L. Human sex chromosomes in oral and craniofacial growth. Arch Oral Biol 2009;54S:18-24.
20. Guatelli-Steinberg D, Sciulli PW, Betsinger TK. Dental crown size and sex hormone concentrations: another look at the development of sexual dimorphism. Am J Phys Anthropol 2008;137:324-33.
21. Ribeiro DC, Sampson W, Hughes T, Brook A, Townsend G. Sexual dimorphism in the primary and permanent dentitions of twins: an approach to clarifying the role of hormonal factors. In: Townsend G, Kanazawa E, Takayama H, eds. New directions in dental anthropology: paradigms, methodologies and outcomes. Adelaide: University of Adelaide Press, 2012;47-66.
22. Ribeiro DC, Brook AH, Hughes TE, Sampson WJ, Townsend GC. Intrauterine hormone effects on tooth dimensions. J Dent Res 2013;92:425-31.
23. Foster TD, Grundy MC. Occlusal changes from primary to permanent dentitions. Br J Orthod 1986;13:187-93.
24. Bishara SE, Jakobsen JR. Changes in overbite and face height from 5 to 45 years of age in normal subjects. Angle Orthod 1998;68:209-16.
25. Ciuffolo F, Manzoli L, D’Attilio M, Tecco S, Muratore F, Festa F et al. Prevalence and distribution by gender of occlusal characteristics in a sample of Italian secondary school students: a corss-sectional study. Eur J Orthod 2005;27:601-6.
26. Sinclair PM, Little RM. Maturation of untreated normal occlusions. Am J Orthod 1983;83:114-23.
27. Thilander B, Pena L, Infante C, Parada SS, de Mayorga C. Prevalence of malocclusion and orthodontic treatment need in children and adolescents in Bogota, Colombia. An epidemiological study related to different stages of dental development. Eur J Orthod 2001;23:153-67.
28. Beyer JW, Lindauer SJ. Evaluation of dental midline position. Semin Orthod 1998;4:146-52.
29. Sheats RD, McGorray SE, Musmar Q, Wheeler TT, King GJ. Prevalence of orthodontic asymmetries. Semin Orthod 1998;4:138- 45.
30. Arya BS, Savara BS, Thomas DR. Prediction of first molar occlusion. Am J Orthod 1973;63:610-21.
31. Bishara SE, Hoppens BJ, Jakobsen JR, Kohout FJ. Changes in the molar relationship between the deciduous and permanent dentitions: a longitudinal study. Am J Orthod Dentofacial Orthop 1988;93:19- 28.
32. Baume LJ. Physiological tooth migration and its significance for the development of occlusion: I. The biogenetic course of deciduous dentition. J Dent Res 1950;29:123-32.
33. Barros SE, Chiqueto K, Janson G, Ferreira E. Factors influencing molar relationship behavior in the mixed dentition. Am J Orthod Dentofacial Orthop 2015;148:782-92.
34. Kerosuo H, Laine T, Nyyssonen V, Honkala E. Occlusal characteristics in groups of Tanzanian and Finnish urban schoolchildren. Angle Orthod 1991;61:49-56.
35. Nanda R, Khan I, Anand R. Age changes in the occlusal pattern of deciduous dentition. J Dent Res 1973;52:221-4.
36. Yilmaz Y, Gürbüz T, Simşek S, Dalmiş A. Primary canine and molar relationships in centric occlusion in three to six year-old Turkish children: a cross-sectional study. J Contemp Dent Pract 2006;7:59- 66.
37. Fernandes S, Gordhanbhai Patel D, Ranadheer E, Kalgudi J, Santokì J, Chaudhary S. Occlusal traits of primary dentition among preschool children of Mehsana District, North Gujarat, India. J Clin Diagn Res 2017;11:ZC92-ZC96.
38. Otuyemi OD, Sote EO, Isiekwe MC, Jones SP. Occlusal relationships and spacing or crowding of teeth in the dentitions of 3-4-year-old Nigerian children. Int J Paediatr Dent 1997;7:155-60.