Human Evolution

, Volume 9, Issue 3, pp 231–247

On the classification of C6 (tuberculum sextum) of the mandibular molars

  • H. J. Keene
Article

Abstract

Cusp six (C6) of the mandibular molars is well-represented in the Hominoid fossil record and occurs with irregular frequency in the various geographic populations of modernHomo as well as in many of the extant non-human primates. The literature reveals considerable controversy and confusion related to C6 anatomic location, definitions and scoring criteria, and a major problem exists in deciding what actually is the “real” or “true” C6, especially relative to variable hypoconulid (C5) expression (i.e., reduction forms and the “divided hypoconulid”). A method is proposed that involves dual 4-point ranking (absent, small, medium, large) and reporting of C5–C6 covariation within a framework of 13 morphological expressivity categories. When applied to 3 different human populations, the method provided a reasonably clear picture of the actual C5 and C6 covariation patterns observed in the mandibular molar dentition. Data obtained from this exercise illustrated that inter- and intrapopulation differences in reported C6 frequencies could be associated with variable scoring criteria as well as with different levels of occlusal attrition and age distribution of the samples.

Key words

Cusp six lower molars dental morphology taxonomy 

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Literatutre cited

  1. Axelsson G. and Kirveskari P. (1979). Sixth and seventh cusp on lower molar teeth of Icelanders.Am. J. Phys. Anthropol., 51:79–82.CrossRefGoogle Scholar
  2. Axelsson G. and Kirveskari P. (1982). Correlations between lower molar occlusal traits in Icelanders. In B Kurten (ed.):Teeth: Form, Function and Evolution. New York: Columbia Univ. Press, pp. 237–244.Google Scholar
  3. Bailit H.L., DeWitt S.J. and Leigh R.A. (1968). The size and morphology of the Nasioi dentition.Am. J. Phys. Anthropol., 28:271–288.CrossRefGoogle Scholar
  4. Bermudez de Castro J.M. (1988). Dental remains from AtapuercaIbeas (Spain) II.Morphology. J. Hum. Evol., 17:279–304.Google Scholar
  5. Berry A.C. (1978). Anthropological and family studies on minor variants of the dental crown. In P.M. Butler and K.A. Joysey (eds.):Development Function and Evolution of Teeth. New York: Academic Press, pp. 81–98.Google Scholar
  6. Biggerstaff R.H. (1968). On the groove configuration of mandibular molars: The unreliability of the “Dryopithecus pattern” and a new method for classifying mandibular molars.Am. J. Phys. Anthropol. 29:441–444.CrossRefGoogle Scholar
  7. Biggerstaff R.H. (1969a). The basal area of posterior tooth crown components: The assessment of within tooth variations of premolars and molars.Am. J. Phys. Anthropol. 31:163–170.CrossRefGoogle Scholar
  8. Biggerstaff R.H. (1969b). Electronic methods for the analysis of the human post-canine dentition.Am. J. Phys. Anthropol. 31:235–242.CrossRefGoogle Scholar
  9. Birdsell J.B. (1967). Preliminary data on the trihybrid origin of the Australian aborigines.Archaeol. Phys. Anthropol. Oceania. 2:100–155.Google Scholar
  10. Brace C.L. (1963). Structural reduction in evolution.Am. Natural. 97:39–49.CrossRefGoogle Scholar
  11. Broom R., and Robinson J.T. (1952). Swartkrans Ape-ManParanthopus crassidens, Transvaal Museum Memoir No. 6, Pretoria: Transvaal Museum, pp. 1–123.Google Scholar
  12. Butler P. (1956). The ontogeny of molar pattern.Biol. Rev. 31:30–70.Google Scholar
  13. Calgano J.M., and Gibson K.R. (1988). Human dental reduction: Natural selection or the probable mutation effect.Am. J. Phys. Anthropol. 77:505–517.CrossRefGoogle Scholar
  14. Campbell T.D. (1925).Dentition and Palate of the Australian Aboriginal. Adelaide. University of Adelaide, pp. 12–16.Google Scholar
  15. Chagula W.K. (1960). The cusps on the mandibular molars of East Africans.Am. J. Phys. Anthropol. 18:83–90.CrossRefGoogle Scholar
  16. Chang C.S. (1963). Anthropological studies on the occlusal surface pattern in the ethnic groups of Taiwan.Acta Anat. Nippon. 38:331–340.Google Scholar
  17. Cope E.D. (1889). On the tritubercular molar in human dentition.J. Morphol. 2:7–27.CrossRefGoogle Scholar
  18. Dahlberg A.A. (1963). Analysis of the American Indian dentition. In D.R. Brothwell (ed.):Dental Anthropology. New York: The Macmillan Co., pp. 149–177.Google Scholar
  19. Dahlberg A.A. (1971). Penetrance and expressivity of dental traits. In A.A. Dahlberg (ed.):Dental Morphology and Evolution. Chicago: Univ. Chicago Press, pp. 257–262.Google Scholar
  20. Dahlberg A.A. (1972). Problems in developing standards for dental and other craniofacial metric and morphological analyses.Am. J. Phys. Anthropol. 37:433–434.Google Scholar
  21. Dahlberg A.A. (1974). Definition and standardization of the traits used in metrical and morphological studies in the dentition.Am. J. Phys. Anthropol. 40:134.Google Scholar
  22. Daito M., Kawahara S., Kanomi R., and Hieda T. (1989). Morphological characteristics of the teeth of Newar children.J. Osaka Dent. Univ. 23:121–130.Google Scholar
  23. Davies P. (1968a). Sexual differences in the relationship of cusp reduction of permanent mandibular first molars to agenesis of teeth.J. Dent. Res. 47:1189.Google Scholar
  24. Davies P.L. (1968b). Relationship of cusp reduction in the permanent mandibular first molar to agenesis of teeth.J. Dent. Res. 47:499.Google Scholar
  25. Day M.H., Leakey R.E.F., Walker A.C. and Wood B.A. (1976). New hominids from East Turkana, Kenya.Am. J. Phys. Anthropol. 45:369–436.CrossRefGoogle Scholar
  26. Erdbrink D.P. (1965). A quantification of theDryopithecus and other lower molar patterns in Man and some of the Apes.Z. Morph. Anthropol. 57:70–108.Google Scholar
  27. Erdbrink D.P. (1967). A quantification of lower molar patterns in deutero-Malayans.Z. Morph. Anthropol. 59:40–56.Google Scholar
  28. Frisch J.E. (1963). Dental variability in a population of gibbons (Hylobates lar). In D.R. Brothwell (ed.):Dental Anthropology. New York: Macmillan Company, pp. 15–28.Google Scholar
  29. Frisch J.E. (1965).Trends in the Evolution of the Hominoid Dentition. New York, S. Karger.Google Scholar
  30. Goaz P.W., and Miller M.C. III (1966). A preliminary description of the dental morphology of the Peruvian Indian.J. Dent. Res. 45:106–119.Google Scholar
  31. Goldstein M.S. (1931). The cusps in the mandibular molar teeth of the Eskimo.Am. J. Phys. Anthropol. 16:215–235.CrossRefGoogle Scholar
  32. Goldstein M.S. (1948). Dentition of Indian crania from Texas.Am. J. Phys. Anthropol. 6:63–83.CrossRefGoogle Scholar
  33. Greene D.L., Ewing G.H., and Armelagos G.J. (1967;) Dentition of a Mesolithic population from Wadi Halfa, Sudan.Am. J. Phys. Anthropol. 27:41–56.CrossRefGoogle Scholar
  34. Gregory W.K. (1916). Studies on the evolution of the primates.Bull. Am. Mus. Nat. Hist. 35:239–355Google Scholar
  35. Gregory W.K. (1918). The evolution of orthodonty.Dent. Cosmos 60:417–425.Google Scholar
  36. Gregory W.K. (1920). The origin and evolution of the human dentition Part IV. The dentition of higher primates and their relationships with man.J. Dent. Res. 2:607–717.Google Scholar
  37. Gregory W.K. (1922).The Origin and Evolution of the Human Dentition. Baltimore, Williams and Wilkins.Google Scholar
  38. Gregory W.K. (1926). Palaeontology of the human dentition.Am. J. Phys. Anthropol. 9:401–426.CrossRefGoogle Scholar
  39. Gregory W.K. (1949). The bearing of the Australopithecinae upon the problem of man’s place in nature.Am. J. Phys. Anthropol. 7:485–512.CrossRefGoogle Scholar
  40. Gregory W.K., and Hellman M. (1926a). Palaeontology of the human dentition Part 1. The crown patterns of fossil and recent human molar teeth and their meaning.Internat. J. Orthodont. 12:1027–1037.Google Scholar
  41. Gregory W.K. and Hellman M. (1926b) The dentition of Dryopithecus and the origin of man.Anthropol. Papers Am. Mus. Nat. Hist. 28:1–123.Google Scholar
  42. Gregory W.K. and Hellman M. (1939). The South African fossil man-apes and the origin of the human dentition.J. Am. Dent. Assoc. 26:558–564.Google Scholar
  43. Hanihara K. (1966). Mongoloid dental complex in the deciduous dentition.J. Anthropol. Soc. Nippon. 74:61–72.Google Scholar
  44. Hanihara K. (1976). Statistical and Comparative Studies of the Australian Aboriginal Dentition.Bulletin No.11 Tokyo, The University Museum, University of Tokyo, pp. 1–57.Google Scholar
  45. Hanihara K. (1977). Dentition of the Ainu and the Australian Aborigines. In A.A. Dahlberg and T.M. Graber (eds.):Orofacial Growth and Development. The Hague: Mouton Publishers, pp. 195–200.Google Scholar
  46. Hanihara K., Masuda T. and Tanaka T. (1974). Affinities of dental characteristics in the Okinawa Islanders.J. Anthropol. Soc. Nippon. 82:75–82.Google Scholar
  47. Hanihara K., Masuda T., Tanaka T., and Tamada M. (1975). Comparative studies of dentition. In S. Watanabe, S. Kondo, and E. Matsunaga (eds.):Anthropological and Genetic Studies on the Japanese Part III. Anthropological and Genetic Studies of the Ainu. Tokyo: University of Tokyo Press, pp. 256–264.Google Scholar
  48. Hanihara K., Tamada M., and Tanaka T. (1970). Quantitative analysis of the hypocone in the human upper molars.J. Anthropol. Soc. Nippon. 78:200–207.Google Scholar
  49. Hanihara T. (1992). Negritos, Australian Aborigines, and the “Proto-Sundadont” dental pattern: The basic populations in East Asia, V.Am. J. Phys. Anthropol. 88:183–196.CrossRefGoogle Scholar
  50. Harris E.F., Turner C.G., II and Underwood J.H. (1975). Dental morphology of living Yap Islanders, Micronesia.Archaeol. Phys. Anthropol. Oceania. 10:218–234.Google Scholar
  51. Hellman M. (1928). Racial characters in human dentition.Proc. Am. Phil. Soc. 67:157–174.Google Scholar
  52. Hershkovitz P. (1971). Basic crown patterns and cusp homologies of mammalian teeth. In A.A. Dahlberg (ed.):Dental Morphology and Evolution. Chicago: University of Chicago Press, pp. 95–150.Google Scholar
  53. Hills, M., Graham S.H. and Wood B.A. (1983). The allometry of relative cusp size in Hominoid mandibular molars.Am. J. Phys. Anthropol. 62:311–316.CrossRefGoogle Scholar
  54. Hopson J.A., and Crompton A.W. (1969). Origin of mammals.Evolutionary Biol. 3:15–72.Google Scholar
  55. Hrdlicka A. (1910). contribution to the anthropology of Central and Smith Sound Eskimo.Arthropol. Papers Am. Mus. Nat. Hist. 5:177–285.Google Scholar
  56. Jacob T. (1967). Racial identification of the Bronze Age human dentitions from Bali, Indonesia.J. Dent. Res. 46(Suppl):903–910.Google Scholar
  57. Johansen D.C., White T.D., and Coppens Y. (1982). Dental remains from the Hadar formation, Ethiopia.Am. J. Phys. Anthropol. 57:545–603.CrossRefGoogle Scholar
  58. Jorgensen K.D. (1955). The Dryopithecus pattern in recent Danes and Dutchmen.J. Dent. Res. 34:195–208.Google Scholar
  59. Jorgensen K.D. (1956). The deciduous dentition.Acta Odont. Scand. 14(Suppl. 20): 1–202.Google Scholar
  60. Kallay J. (1966). Extra cusp formation in the human dentition.J. Dent. Res. 45:1381–1394.Google Scholar
  61. Kanazawa E., Sekikawa M., Akai J. and Ozaki T. (1985). Allometric variation on cuspal areas of the lower first molar in three racial populations.J. Anthropol. Soc. of Nippon. 93:425–438.Google Scholar
  62. Keene H.J. (1971). An epidemiologic study of tooth size variability in caries-free naval recruits.J. Dent. Res. 50:1331–1345.Google Scholar
  63. Keene H.J. (1979). Mesiodistal crown diameters of permanent teeth in male American Negroes.Am. J. Orthodont. 76:95–99.CrossRefGoogle Scholar
  64. Keene H.J. (1986). Dental caries prevalence in early Polynesians from the Hawaiian Islands.J. Dent. Res. 65:935–938.Google Scholar
  65. Kirveskari P. (1978). Racial traits in the dentition of living Skolt Lapps. In P.M. Butler and K.A. Joysey (eds.):Development Function and Evolution of Teeth. New York: Academic Press, pp. 59–68.Google Scholar
  66. von Koenigswald G.H.R. (1967). Evolutionary trends in the deciduous molars of the Hominidea.J. Dent. Res. 46 (Suppl. 5):779–786.Google Scholar
  67. Kraus B.S. and Jordan R.E. (1965).The Human Dentition Before Birth. Philadelphia: Lea and Febiger.Google Scholar
  68. Lavelle C.L.B., Ashton E.H. and Flinn R.M. (1970). Cusp pattern, tooth size and third molar agenesis in the human mandibular dentition.Arch. Oral Biol. 15:227–237.CrossRefGoogle Scholar
  69. Leakey R.E.F., and Wood B.A. (1974). New evidence of the genusHomo from East Rudolf, Kenya (IV).Am. J. Phys. Anthropol. 41:237–244.CrossRefGoogle Scholar
  70. Leakey R.E.F. and Walker A. (1988). New Australopithecus boisei specimens from East and West Lake Turkana, Kenya.Am. J. Phys. Anthropol. 76:1–24.CrossRefGoogle Scholar
  71. Leigh R.W. (1937). Dental morphology and pathology of pre-Spanish Peru.Am. J. Phys. Anthropol. 22:267–296.CrossRefGoogle Scholar
  72. Manabe Y., Rokutanda A., Kitagawa Y. and Oyamada J. (1991). Genealogical position of native Taiwanese (Bunun tribe) in East Asian populations based on tooth crown morphology.J. Anthropol. Soc. Nippon. 99:33–47.Google Scholar
  73. Matsuda T. (1961). Studies on theDryopithecus pattern of the Japanese residing in Hokuriku district.Okajima Folia Anat. Japn. 37:317–330.Google Scholar
  74. Mayhall J.T. (1979). The dental morphology of the Inuit of the Canadian Central Arctic.Ossa 6:199–218.Google Scholar
  75. Mayhall J.T., Saunders S.R., and Belier P.L. (1982). The dental morphology of North American whites, a reappraisal. In B. Kurten (ed.).Teeth: Form Function and Evolution. New York: Columbia University Press, pp. 245–258.Google Scholar
  76. Mayhall, J.T., and Saunders S.R. (1986). Dimensional and discrete dental asymmetry relationships.Am. J. Phys. Anthropol. 69:403–411.CrossRefGoogle Scholar
  77. Mizoguchi Y. (1988). Degree of bilateral asymmetry of nonmetric tooth crown characters quantified by the tetrachoric correlation method.Bull. Natn. Sci. Mus., Tokyo, Ser. D, 14:29–49.Google Scholar
  78. Nakamura M. (1957). Occlusal surface pattern of the lower molars in recent Japanese.Acta Anat. Nippon. 32:510–528.Google Scholar
  79. Nelson C.T. (1938). The teeth of the Indians of Pecos Pueblo.Am. J. Phys. Anthropol. 23:261–293.CrossRefGoogle Scholar
  80. Nichol C.R., and Turner C.G. II (1986) Intra- and interobserver concordance in classifying dental morphology.Am. J. Phys. Anthropol. 69:299–315.CrossRefGoogle Scholar
  81. Nomata N. (1964). A chronological study on the crown formation of the human decidous dentition.Bull. Tokyo Med Dent. Univ. 11:55–76.Google Scholar
  82. Onda S. (1959). Anatomical studies on the position, arrangement and calcification of the milk tooth germ in the Japanese embryo.Shikwa Gak. 59:1–37.Google Scholar
  83. Osborn H.F. (1892). The history and homologies of the human molar cusps.Anat. Anz. 7:48–55.Google Scholar
  84. Park K.S., Yanagisawa M., Tokunaga K., and Omoto K. (1988). Genetic polymorphisms of complement components C6 and C7 in Koreans.Japn. J. Hum. Genet. 33:325–332.CrossRefGoogle Scholar
  85. Perzigian A.J. (1976). The dentition of the Indian Knoll skeletal population: Odontometrics and cusp number.Am. J. Phys. Anthropol. 44:113–122.CrossRefGoogle Scholar
  86. Robinson J.T. (1956). The Dentition of the Australopithecine.Transvaal Museum Memoir. No. 9, Pretoria: Transvaal Museum, pp. 1–179.Google Scholar
  87. Robinson J.T. (1967). Variation and the taxonomy of the earlyHominids.Evol. Biol. 1:69–100.Google Scholar
  88. Rosenzweig K.A., and Zilberman Y. (1967). Dental morphology of Jews from Yemen and Cochin.Am. J. Phys. Anthropol. 26:15–22.CrossRefGoogle Scholar
  89. Rothhammer F., Lasserre E., Blanco R., Covarrubias E., and Dixon M. (1968). Microevolution in human Chilean populations IV. Shovel shape, mesial-palatal version and other dental traits in Pewenche Indians.Z. Morph. Anthropol. 60:162–169.Google Scholar
  90. Ruffer A. (1920). Study of abnormalities and pathology of ancient Egyptian teeth.Am. J. Phys. Anthropol. 3: 335–382.CrossRefGoogle Scholar
  91. Saheki M. (1958). On the heredity of the tooth crown configuration studied in twins.Acta Anat. Nippon. 33: 456–470.Google Scholar
  92. Sakai T. (1975). The dentition of the Hawaiians.J. Anthropol. Soc. Nippon. 83:49–84.Google Scholar
  93. Sakai T., and Hanamura H. (1973). A morphological study of enameldentin border on the Japanese dentition. VI. Mandibular molar.J. Anthropol. Soc. Nippon. 81:25–45.Google Scholar
  94. Sakai T., Kawamato K., and Tomiyasu S. (1985). The dentition of the Micronesians.J. Anthropol. Soc. Nippon. 93:337–358.Google Scholar
  95. Schuman E.L., and Brace C.L. (1954). Metric and morphologic variations in the dentition of the Liberian chimpanzee; comparisons with anthropoid and human dentitions.Hum. Biol. 26:239–268.Google Scholar
  96. Scott G.R., and Dahlberg A.A. (1982). Microdifferentiation in tooth crown morphology among Indians of the American southwest. In B. Kurten (ed.):Teeth Form and Function.New York: Columbia Univ Press, pp. 259–291.Google Scholar
  97. Scott G.R., Potter R.H.Y., Noss J.F., Dahlberg A.A., and Dahlberg T. (1983). The dental morphology of Pima Indians.Am. J. Phys. Anthropol. 61:13–31.CrossRefGoogle Scholar
  98. Scott G.R., Street S., and Dahlberg A.A. (1986). The dental variation of Yuman speaking groups in an American southwest context.Mem. Mus. Natn. Hist. Nat., Paris (series C) 53:305–319.Google Scholar
  99. Selenka E. (1898).Menschenhafen; I: Rassen, Shadel und Bezahnung des Orangutan. Wiesbaden, Part 1:1–91.Google Scholar
  100. Sharma J.C. (1983). Dental morphology of the Tibetan immigrants.Am. Phys. Anthropol. 61:495–505.CrossRefGoogle Scholar
  101. Shaw J.C.M. (1931).The Teeth, the Bony Palate and the Mandible in Bantu Races of South Africa. London: John Bale, Sons & Danielsson Ltd., pp. 1–134.Google Scholar
  102. Simons E.L. (1968). A source for dental comparison of Ramapithecus with Australopithecus and Homo.S. Afr. J. Sci. 64:92–112.Google Scholar
  103. Simpson G.G. (1928).A catalogue of the Mesozoic Mammalia. London: The British Museum.Google Scholar
  104. Skaryd S.M. (1971). Trends in the evolution of the pongid dentition.Am. J. Phys. Anthropol. 35:223–240.CrossRefGoogle Scholar
  105. Smith P. (1977). Variations in dental traits within populations. In A.A. Dahlberg and T.M. Graber (eds.):Orofacial Growth and Development. The Hague: Mouton Publ., pp. 171–181.Google Scholar
  106. Smith P., Brown T., and Wood W.B. (1981). Tooth size and morphology in a recent Australian Aboriginal population from Broadbeach, South East Queensland.Am. J. Phys. Anthropol. 55:423–432.CrossRefGoogle Scholar
  107. Smith P., Prokopec M. and Pretty G. (1988). Dentition of a prehistoric population from Roonka Flat, South Australia.Archaeol. Oceana 23:31–36.Google Scholar
  108. Sofaer J.A., Niswander J.D., MacLean C.J. and Workman P.L. (1972). Population studies on Southwestern Indian tribes V. Tooth morphology as an indicator of biological distance.Am. J. Phys. Anthropol. 37:357–366.CrossRefGoogle Scholar
  109. Sofaer J.A., Smith P., and Kaye E. (1986). Affinities between contemporary and skeletal Jewish and non-Jewish groups based on tooth morphology.Am. J. Phys. Anthropol. 70:265–275.CrossRefGoogle Scholar
  110. Suzuki M., and Sakai T. (1956). On the Dyopithccus pattern in recent Japanese.J. Anthropol. Soc. Nippon. 64:87–94.Google Scholar
  111. Suzuki M., and Sakai T. (1973) Occlusal surface pattern of the lower molars and the second deciduous molar among the living Polynesians.Am. J. Phys. Anthropol. 39:305–316.CrossRefGoogle Scholar
  112. Swindler D.R. (1976).Dentition of Living Primates. New York: Academic Press.Google Scholar
  113. Swindler D.R. (1983). Variations and homology of the primate hypoconulid.Folia Primatol. 41:112–123.CrossRefGoogle Scholar
  114. Tobias P.V. (1971). Human skeletal remains from the Cave of Hearths, Makapansgat, Northern Transvaal.Am. J. Phys. Anthropol. 34:335–368.CrossRefGoogle Scholar
  115. Tobias P.V. (1991).Olduvai Gorge: The Skulls, Endocasts and Teeth of Homo Habilis. Cambridge: Cambridge University Press.Google Scholar
  116. Topinard P. (1892). De l’evolution des molaires et premolaries chez les primates.L’Anthropologie 3:641–710.Google Scholar
  117. Townsend G., Yamada H., and Smith P. (1990). Expression of the entoconulid (sixth cusp) on mandibular molar teeth of an Australian Aboriginal population.Am. J. Phys. Anthopol. 82:267–274.CrossRefGoogle Scholar
  118. Turner C.G., II (1970). New classification of non-metrical dental variation: cusp 6 and 7.Paper presented 39th annual meeting.Am. Assoc. Phys. Anthropol., Washington, D.C.Google Scholar
  119. Turner C.G. II (1976). Dental evidence on the origins of the Ainu and Japanese.Science. 193:911–913.Google Scholar
  120. Turner C.G. II (1985). The dental search for native American origins. In R. Kirk, and E. Szathmary (eds.):Out of Asia: Peopling the Americas and the Pacific. Canberra: Australian National University, pp. 31–78.Google Scholar
  121. Turner C.G. II (1985). Late Pleistocene and Holocene population history of East Asia based on dental variation.Am. J. Phys. Anthropol. 73:305–321.CrossRefGoogle Scholar
  122. Turner C.G. II and Hanihara K. (1977). Additional features of the Ainu dentition V. Peopling of the Pacific.Am. J. Phys. Anthropol. 46:13–24.CrossRefGoogle Scholar
  123. Turner C.G. II, and Swindler D.R. (1978). The dentition of New Britain West Nakanai Melanesians VIII. Peopling of the Pacific.Am. J. Phys. Anthropol. 49:361–372.CrossRefGoogle Scholar
  124. Turner C.G. II, Nichol C.R. and Scott G.R. (1991). Scoring procedures for key morphological traits of the permanent dentition: The Arizona State University Dental Anthropology System. In M.A. Kelley and C.S. Larsen (eds.):Advances in Dental Anthropology. New York: Wiley Liss Inc., pp. 13–31.Google Scholar
  125. Turner E. (1963). Crown development in human deciduous teeth.Arch. Oral Biol. 8:523–540.CrossRefGoogle Scholar
  126. Weidenreich F. (1937). The dentition ofSinanthropus pekinensis: A comparative odontography of the Hominids.Palaeontolog. Sinica (Whole Series D) No. 1.Google Scholar
  127. Weidenreich F. (1945). Giant early man from Java and South China.Anthropol. Papers Am. Mus. Nat. Hist. 40(Part 1):1–134.Google Scholar
  128. White T.D. and Johansen D.C. (1982). Pliocene Hominid mandibles from the Hadar formation, Ethiopia: 1974–1977 collections.Am. J. Phys. Anthropol. 57:501–544.CrossRefGoogle Scholar
  129. Wood B. (1991). Koobi Fora Research Project Volume 4.Hominid Cranial Remains. Oxford: Clarendon Press.Google Scholar
  130. Wood B.A. and Abbott S.A. (1983). Analysis of the dental morphology of Plio-Pleistocene hominids I. Mandibular molars: crown area measurements and morphological traits.J. Anat. 136:197–219.Google Scholar
  131. Wood B.A., Abbott S.A. and Graham S.H. (1983). Analysis of the dental morphology of Plio-Pleistocene hominids II. Mandibular molars: study of cusp areas, fissure pattern and cross sectional shape of the crown.J. Anat. 137:287–314.Google Scholar
  132. Zoubov A.A. (1964). The cusp reduction order and the modification of the crown pattern in permanent lower molars of man transformed from the five-cusp type into the three cusp type.Ybk. Phys. Anthropol. 12:117–124.Google Scholar

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© International Institute for the Study of Man 1994

Authors and Affiliations

  • H. J. Keene
    • 1
  1. 1.Science Center Dental Branch Department of Oral Diagnostic SciencesThe University of Texas HealthHouston

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