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修复治疗的基本目的之一为建立一个生理性的牙周环境,以及便于维持牙周健康。人造冠的外形、边缘位置及桥体的形式均能影响牙周的健康。本文复习了有关这三方面的最新学说。冠的外形:全冠及部份冠的外形对建立一个较理想的牙周环境是起主要作用的。冠外形的三个主要学说为:1.牙龈保护学说;2.肌肉作用学说;3.便于口腔清洁学说。牙龈保护学说:主张修复体设计的形态要具有保护牙龈免遭机械性刺激的作用。本观点虽缺乏科学依据,但在牙医学领域内持续很久,这主要是凭借经验而论的。Wheeler氏认为“由于牙龈缺乏保护而有根尖退缩的倾向,嗣后将产生有害的影响”。一些牙科医师及技术室人员认为既然轻微刺激对
One of the basic purposes of healing is to establish a physiological periodontal environment and to facilitate the maintenance of periodontal health. Artificial crown shape, edge position and bridge form can affect the periodontal health. This article reviews the latest doctrine on these three areas. Crown shape: full crown and some crown shape to establish a more ideal periodontal environment is to play a major role. Three main doctrines of crown shape are: 1. Gum protection theory; 2. Muscle role theory; 3. To facilitate oral hygiene theory. Gingival protection doctrine: advocates the shape of the restoration design should have the role of protecting the gums from mechanical stimulation. Although lack of scientific basis for this view, but in the field of dentistry lasted for a long time, mainly by experience. Wheeler argues that “there is a tendency to tip out due to lack of gingival protection, which will have a detrimental effect later on.” Some dentists and technicians think that since a slight stimulation to right