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In: Laughlin WS, eds, The physical anthropology of the American Indian. New York Viking Fund, 1951; 138-176."},{"key":"2","unstructured":"2) Tomizawa M, Yonemochi H, Kohno M, Noda T: Unilateral delayed eruption of maxillary permanent molars; four case reports. Pediatr Dent 1998; 53-56."},{"key":"3","unstructured":"3) Rasmussen P: &ldquo;9-year-molars&rdquo; aberrantly developing and erupting: report of cases. J Clin Pediatr Dent 1998; <b>22:<\/b>151-153."},{"key":"4","doi-asserted-by":"crossref","unstructured":"4) Sano N, Hasegawa Y, Iijima S, Terada K: Study of delayed development of the upper first molars. Okajimas Folia Anat Jpn 2010; <b>87:<\/b>25-31.","DOI":"10.2535\/ofaj.87.25"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5) Yamada H: Tooth size morphology of affected molars in individuals with congenitally missing first molar. 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Dent Mater J 2008; <b>27:<\/b>549-554.","DOI":"10.4012\/dmj.27.549"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12) Morita W, Yano W, Nagaoka T, Abe M, Ohshima H, Nakatsukasa M: Patternsof morphological variation in enamel-dentin junction and outer enamel surface of human molars. J Anat 2014; <b>224:<\/b>669-680.","DOI":"10.1111\/joa.12180"},{"key":"13","unstructured":"13) The Japanese Society of Pedodontics: The Chronology of Deciduous and Permanent Dentition in Japanese Children. Int J Jpn Soc Pediatric Dent 1988; <b>26:<\/b>1-18 (in Japanese)."},{"key":"14","doi-asserted-by":"crossref","unstructured":"14) Sano N, Kameda T, Terashima Y, Nomintsetseg B, Terada K: Formation and development of maxillary first molars with delayed eruption. 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Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1985; <b>59:<\/b>420-425.","DOI":"10.1016\/0030-4220(85)90070-2"},{"key":"19","unstructured":"19) J&auml;rvinen S: Congenitally missing first permanent molars: unusual course of development. ASDC J Dent Child 1984; <b>51:<\/b>374-375."},{"key":"20","doi-asserted-by":"crossref","unstructured":"20) Noda T, Takagi M, Hayashi-Sakai S, Taguchi Y: Eruption disturbances in Japanese children and adolescents. Ped Dent J 2005; <b>16:<\/b>50-56.","DOI":"10.1016\/S0917-2394(06)70065-9"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21) Proff P, Bayerlein TH, Fangh&auml;nel J, Allegrini SJ, Gedrange T: Morphological and clinical considerations of first and second permanent molar eruption disorders. Ann Anat 2006; <b>188:<\/b>353-361.","DOI":"10.1016\/j.aanat.2006.02.003"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22) Kramer RM, Williams AC: The incidence of impacted teeth. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1970; <b>29:<\/b>237-241.","DOI":"10.1016\/0030-4220(70)90091-5"},{"key":"23","unstructured":"23) Barberia-Leache E, Suarez-Cl&uacute;a MC, Saavedra-Ontiveros D: Ectopic eruption of the maxillary first permanent molar: Characteristics and occurrence in growing children. Angle Orthod 2005; <b>75:<\/b>610-615."},{"key":"24","doi-asserted-by":"crossref","unstructured":"24) Philipsen HP, Thosaporn W, Reichard PA, Grundt G: Odontogenic lesions inopercula of permanent molars delayed in eruption. J Oral Pathol Med 1992; <b>21:<\/b>38-41.","DOI":"10.1111\/j.1600-0714.1992.tb00967.x"},{"key":"25","unstructured":"25) Chintakanon K. Boonpinon P: Ectopic eruption of the first permanent molars: Prevalence and etiologic factors. Angle Orthod 1998; <b>68:<\/b>153-160."},{"key":"26","doi-asserted-by":"crossref","unstructured":"26) Palma C, Coelho A, Gonz&aacute;lez Y, Cahuana A: Failure of eruption of first and second permanent molars. 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