A study of the family-line transmission of dental occlusion

A metrical comparison of maxillary first premolar form

“…Such a value places more emphasis on environmental factors than traditionally assumed. Family and twin studies have also documented strong genetic control of major variants, e.g., missing teeth (Montagu, 1960), along with general tooth and dental arch configuration (Goldberg, 1929;Asbell, 1957). Recent studies have also indicated that single gene control of some minor tooth variants, e.g., incisor shovelling (Turner, 1967), although the majority of the data suggests that multifactorial genetic factors are involved in odontometric traits (Sofaer, 1970).…”

Evolving concepts of heredity and genetics in orthodontics

“…33,36 From that point on, during the late 1930s and throughout the 1950s, much of orthodontic research focused on family pedigrees and especially on the study of twins from the perspectives of Mendelian genetics. [37][38][39][40][41][42][43] Virtually all of those studies tended to support the newly popular opinion that heredity determines the size and shape of the jaws in both normal and abnormal development and growth. 33,44,45 Thus, by the 1940s, opinions among most orthodontic educators and researchers had switched from abrogation of heredity as the primary factor determining normal and abnormal dentofacial growth and form to the position that "today, the hereditary factors are considered first in importance and [local environmental] factors second in the process of growth and development."…”

Oral Structures Genetically and Anthropologically Considered

“…In a detailed study of 10 families Asbell (1957) suggested trait inheritance in family lines via three types of transmission: (1) repetitive trait, (2) discontinuous or assortative trait, and (3) mixed trait (FIGUKE 7). Asbell's figure gives the key used by him, and FIGURE 8 gives the pedigree of the family-line of patient A.J.…”