Witter D J, De Haan A F, Käyser A F, Van Rossum G M
Department of Oral Function and Prosthetic Dentistry, School of Dentistry, Nijmegen, The Netherlands.
J Oral Rehabil. 1991 May;18(3):203-12. doi: 10.1111/j.1365-2842.1991.tb00049.x.
The periodontal support of subjects with shortened dental arches (SDA, n = 74), and of subjects with SDA and free-end removable partial dentures in the lower jaw (SDA and RPD, n = 25) was compared with that of subjects with complete dental arches (CDA, n = 72). The periodontal support was determined by tooth mobility and alveolar bone height, measured on a radiograph, of the distal alveolar bone of the premolars. Significant differences in tooth mobility were found between the three groups of subjects. The relative bone height showed a trend towards lower values for the SDA group and the SDA and RPD group. For some teeth these differences were significant. Premolars that are the most posteriorly located occluding teeth in the dental arch tend to have a lower relative alveolar bone height than premolars in an intermediate location. This effect is more marked in the upper jaw than in the lower jaw. Premolars in the lower jaw, that serve as abutment teeth for free-end RPDs, tend to show lower values for the relative bone height. It is concluded that the differences between the three groups with regard to the periodontal support are small. The large amount of crowns and bridges in both the SDA and SDA and RPD groups, and the dental history of these subjects, resulting in SDA, should be taken into account. However, as indicated by the periodontal breakdown of premolars in some subjects with SDA, the combination of an existing severe periodontal involvement and a SDA is considered to be an unfavourable situation.
将牙弓缩短（SDA，n = 74）的受试者以及下颌有牙弓缩短和游离端可摘局部义齿（SDA和RPD，n = 25）的受试者的牙周支持情况，与全牙弓（CDA，n = 72）的受试者进行了比较。通过牙齿松动度和在X线片上测量的前磨牙远中牙槽骨的牙槽骨高度来确定牙周支持情况。在三组受试者之间发现牙齿松动度存在显著差异。相对骨高度显示SDA组和SDA与RPD组有降低的趋势。对于某些牙齿，这些差异具有统计学意义。牙弓中最靠后的咬合牙齿——前磨牙，其相对牙槽骨高度往往低于位于中间位置的前磨牙。这种影响在上颌比下颌更明显。下颌中作为游离端RPD基牙的前磨牙，其相对骨高度往往较低。得出的结论是，三组在牙周支持方面的差异较小。应考虑SDA组和SDA与RPD组中大量的冠和桥，以及这些导致SDA的受试者的牙科病史。然而，正如一些SDA受试者中前磨牙的牙周破坏所表明的，现有的严重牙周病变与SDA的组合被认为是一种不利情况。
