The aim of the study is to examine the process of change with age of hard and total palate arching. Differences were compared in the arching of the hard and total palate in pairs of twins of the same sex and in pairs of twins of opposite sexes aged between 4 and 7 months of foetal life. On the basis of the results obtained it may be stated that: 1. There is some delay in the process of development of twin foetuses in comparison with ones from a single pregnancy; 2. There are no substantial differences between male and female twins and between twins from heterosexual pairs; 3. Much greater differences take place in older twins with regard to the features under examination.
1. Aleksiejew A, Debiec W (1964) Anthropometric characteristics of the hard palate. Compt Rend Ac Bulg Sci, 117: 168–174.
2. Bergman P, Sawicki K (1988) Zarys metody bliźniąt. In: Bergman P (ed.). Bliźnięta wrocławskie I. Materiały i Prace Antropologiczne, 108: 11–50.
3. Jordanov J (1972) Anatomical and anthropological characteristics of the human hard palate. Awtoreferat, Sofia.
4. Kurlej W (1979) Zmienność cech opisowych i pomiarowych podniebienia twardego i miękkiego w rozwoju prenatalnym człowieka. Akademia Medyczna, Wrocław.
5. Kurlej W, Borysławski K (1983) Zmienność cech metrycznych podniebienia twardego i miękkiego. Materiały i Prace Antropologiczne, 103: 47–56.
6. Laatkainen T (1999) Etiological aspects on craniofacial morphology in twins with cleft lip and palate. Eur J Oral Sci, 107: 102–108.
7. Lavelle CLB, Moore WJ (1970) Proportional growth of the human jaws between the fourth and seventh months of intrauterine life. Arch Oral Biol, 15.
8. Martin R (1962) Lehrbuch der Anthropologie. G. Fischer, Stuttgart.
9. Moriyama K, Motohashi N, Kitamura A, Kuroda T (1998) Comparison of craniofacial and dentoalveolar morphologies of three Japanese monozygotic twin pairs with cleft lip and/or palate discordancy. Cleft Palate Craniofac J, 35: 173–180.
10. Singh GD, Kutcipal E, MCNamara JA (2003) Deformations of the midfacial complex in twins with orofacial clefts. Cleft Palate Craniofac J, 40: 403–408.
11. Shapiro BL (1969) A twin study of palatal dimensions partitioning genetic and environmental contributions to variability. Angle Orthod, 39: 139–151.