Bulanov V I, Strel'nikov V N
Stomatologiia (Mosk). 1991 Jul-Aug(4):60-2.
Analysis of the type of teeth crown exposure in talking and smiling, carried out in 798 subjects, has shown that the perigingival third of the crowns is not exposed in the majority of the examinees. This permitted employment of cast combined crowns with wide perigingival metal rims to support the clasp dentures to make them look better when supplying 73 patients with partial removable dentures.
对798名受试者进行的说话和微笑时牙冠暴露类型的分析表明，大多数受检者牙冠的龈周三分之一未暴露。这使得在为73例患者提供局部可摘义齿时，能够使用带有宽龈周金属边缘的铸造联合冠来支撑卡环义齿，使其外观更好。
