There tooth abnormalities can be classified into four major groups, depending on the depth of the invagination. A typical example from group four is described. Thorough röntgenological examination reveals a frequent occurrence. The great diversity in nomenclature and the variety of morphogenetic and etiological theories show that genetic factors are very important in the development of an invaginated tooth and that knowledge concerning the pathomechanisms is very inadequate. A detailed inspection of the inner tooth morphology on röntgennogram is necessary as the surface morphology generally does not reveal the existence of an invagination. The irreversible pathological evolution occurring when diagnosis is neglected. Should incite the practitioner to look for invaginations on every set of röntgenograms. Five thereapeutic techniques are described. If an appropriate endodontic technique is applied, a successful root canal filling can be achieved.
根据内陷深度，牙齿异常可分为四大类。描述了第四组中的一个典型例子。全面的X线检查显示其经常出现。命名的巨大多样性以及形态发生学和病因学理论的多样性表明，遗传因素在陷入性牙齿的发育中非常重要，而关于发病机制的知识非常不足。由于表面形态通常无法显示内陷的存在，因此有必要在X线片上对内牙形态进行详细检查。忽视诊断时发生的不可逆病理演变应促使从业者在每组X线片上寻找内陷。描述了五种治疗技术。如果应用适当的牙髓治疗技术，可以成功完成根管充填。
