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(îò ãðå÷. diastema - ïðîìåæóòîê) - óâåëè÷åííûé ïðîìåæóòîê ìåæäóçóáàìè ó ìëåêîïèòàþùèõ æèâîòíûõ æâà÷íûå( ãðûçóíû, ëîøàäè, êåíãóðó) Ó÷åëîâåêà ðàçâèâàåòñÿ ïðè íåïðàâèëüíîì ðàñïîëîæåíèè âåðõíåé èëè íèæíåéãóáû, âðîæäåííîì îòñóòñòâèè áîêîâûõ ðåçöîâ. |
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