Variations in the Cusps of Mandibular Molars in Koreans
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초록
This study aimed to investigate the cusp size and morphological characteristics of permanent mandibularmolars in Koreans with reference to the hypoconulid, and to analyze the differences and correlations betweenboth sexes as well as between first and second mandibular molars. We obtained data from dental casts of 110adults (78 males and 32 females). Mesiodistal and buccolingual diameters of first and second mandibular molars,the area of five cusps (protoconid, metaconid, hypoconid, entoconid, and hypoconulid), as well as the total cusparea and occlusal table area were measured. Paired t-test was performed to analyze the morphological differencesbetween first and second mandibular molars and the sex differences between both sexes using SPSS program. Crown diameters and cusp areas of mandibular first molars were larger than those of mandibular second molarsin both sexes. The hypoconulid was the most variable in size and morphological pattern among the five cusps,and the first molars showed a higher incidence of hypoconulid than the second molars. Except for the entoconidarea of the first molar (p=0.06) and the hypoconulid area of the second molar (p=0.24), all other mean valueswere larger in males than in females, demonstrating a significant sexual dimorphism. These data suggest that theteeth which develop late in ontogeny tend to be smaller in size and more variable in morphological characteristics.
Abstract
This study aimed to investigate the cusp size and morphological characteristics of permanent mandibularmolars in Koreans with reference to the hypoconulid, and to analyze the differences and correlations betweenboth sexes as well as between first and second mandibular molars. We obtained data from dental casts of 110adults (78 males and 32 females). Mesiodistal and buccolingual diameters of first and second mandibular molars,the area of five cusps (protoconid, metaconid, hypoconid, entoconid, and hypoconulid), as well as the total cusparea and occlusal table area were measured. Paired t-test was performed to analyze the morphological differencesbetween first and second mandibular molars and the sex differences between both sexes using SPSS program. Crown diameters and cusp areas of mandibular first molars were larger than those of mandibular second molarsin both sexes. The hypoconulid was the most variable in size and morphological pattern among the five cusps,and the first molars showed a higher incidence of hypoconulid than the second molars. Except for the entoconidarea of the first molar (p=0.06) and the hypoconulid area of the second molar (p=0.24), all other mean valueswere larger in males than in females, demonstrating a significant sexual dimorphism. These data suggest that theteeth which develop late in ontogeny tend to be smaller in size and more variable in morphological characteristics.
참고문헌 (25)
- Jensen E, "Thomsen SO. Mesiodistal crown diameters of the deciduous and permanent teeth in individuals", J Dent Res, 36, pp.39~47 (1957)
- Garn SM, "Kerewsky RS. Genetic control of sexual dimorphism in tooth size", J Dent Res, 46, pp.963~972 (1967)
- Turner II CG NC, "Scoring procedure for key morphological traits of the permanent dentition: The arizona state university dental anthropology system" (1991), Wiley-Liss
- Bailey SE, "Interobserver error involved in independent attempts to measure cusp base areas of pan m1s", J Anat, 205, pp.323~331 (2004)
- Hattab FN, "Mesiodistal crown diameters of permanent teeth in jordanians", Arch Oral Biol, 41, pp.641~645 (1996)
- Kraus BS, "Dental anatomy and occlusion:A study of the masticatory system" (1969), The Williams & Wilkins Company
- Nelson SJ, "Wheeler’s dental anatomy, physiology and occlusion", Elsevier Health Sciences, pp.322~323 (2003)
- Takahashi M, "Variability in cusp size of human maxillary molars, with particular reference to the hypocone", Arch Oral Biol, 52, pp.1146~1154 (2007)
- Gingerich PD, "Size variability of the teeth in living mammals and the diagnosis of closely related sympatric fossil species", J Paleontol, 48, pp.895~903 (1974)
- Kondo S, "Sexual dimorphism of cusp dimensions in human maxillary molars", Am J Phys Anthropol, 128, pp.870~877 (2005)
- Macho GA, "Reduction of maxillary molars in homo sapiens sapiens: A different perspective", Am J Phys Anthropol, 87, pp.151~159 (1992)
- Corruccini RS, "Molar cusp-size variability in relation to odontogenesis in hominoid primates", Arch Oral Biol, 24, pp.633~634 (1979)
- Park DE, "Different mandibular first molar shapes according to groove and cusp configuration in relation to suggested bracket position", Eur J Orthod, 35, pp.730~736 (2013)
- Kim KR, "Morphological changes in the crown of mandibular molars with an additional distolingual root", Arch Oral Biol, 58, pp.248~253 (2013)
- Zar JH, "Biostatistical analysis" (2010), Pearson: Prentice-Hall
- Gregory WK, "Studies on the evolution of the primates-part i the cope-osborn “theory of trituberculy” and the ancestral molar patterns of the primates", Bulletin of the American Museum of Natural History, 35, pp.239~255 (1916)
- Hellman M, "Racial characters of human dentition", Proceedings of the American Phylosophical Society, 67, pp.157~174 (1928)
- Wood BA, "Analysis of the dental morphology of plio-pleistocene hominids. V. Maxillary postcanine tooth morphology", J Anat, 161, pp.1~35 (1988)
- Macaluso PJ, Jr, "Sex discrimination potential of permanent maxillary molar cusp diameters", Forensic Odontostomatol, 28, pp.22~31 (2010)
- Wells JC, "Sexual dimorphism of body composition", Best Pract Res Clin Endocrinol Metab, 21, pp.415~430 (2007)
- Harris EF, "Intercusp relationships of the permanent maxillary first and second molars in american whites", Am J Phys Anthropol, 130, pp.514~528 (2006)
- Polychronis G, "Geometric morphometric 3d shape analysis and covariation of human mandibular and maxillary first molars", Am J Phys Anthropol, 152, pp.186~196 (2013)
- Townsend G, "Molar intercuspal dimensions:Genetic input to phenotypic variation", J Dent Res, 82, pp.350~355 (2003)
- Quam R, "Evolution of m1 crown size and cusp proportions in the genus homo", J Anat, 214, pp.655~670 (2009)
- Morita W, "Size and shape variability in human molars during odontogenesis", J Dent Res, 93, pp.275~280 (2014)