Розмір шрифту: 

According to the literature, two types of molars odontoglyphics drawing are defined on the masticatory surface of molars: igrek (Y) and plus (+). Type of the pattern reflects mutual disposition of the major bumps in the center of the crown. Y-pattern stated in the case where the eocone and diacone are contacted. +-pattern means dotted contact between all four main bumps in the center of the crown. The pattern of crown’s masticatory surface in combination with the number of bumps is considered the main morphological characteristics of molars. According to the theory of Dalberg the quantity of bumps on the masticatory surface of the molars is determined with the help of morphogenetic field of molarization. The concept of the morphogenetic field includes complex relationships of cellular enamel elements , dentin and pulp, which are defined as the general morphological characteristics of the teeth as well the individual features of one class (class specifical). In the middle of the class there are areas, where the morphogenetic field has the most powerful action and morphological sign is the most distinct. According to A. Dalberg, the first molars of upper and lower jaws have the most powerful field of molarization and they are the «key» teeth. In the second and third molars the field of molarization is less significant, that is manifested in a decrease of the number of cusps and their height.