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以前,人们一直认为,牙修复体之所以引起牙龈发炎,是由于其解剖外形不规则及边缘粗糙的机械刺激,以及修复材料溶解的化学作用所致。但是,后来的研究表明:炎症是由于疏松牙石内的碎屑产生的细菌毒素所致。如果菌斑和牙龈接触,即便无牙石沉积,也可引起牙龈发炎。所以,能使牙石或菌斑沉积的任何因素都可导致龈炎。边缘不密合(marginal discordance):实验研究表明,只要修复体边缘密合,不同的合金,对牙龈的刺激的差别不明显,尽管各种
In the past, it has long been thought that the reason that dental restorations cause inflammation of the gums is due to the irregular anatomy and rough edges of the mechanical stimuli, as well as the chemical effects of repairing the material. However, later studies showed that inflammation is caused by bacterial toxins produced by loose debris in the calculus. If the plaque comes into contact with the gums, gums can be inflamed even without calculus deposition. So, any factor that can cause the deposition of calculus or plaque can cause gingivitis. Marginal discordance: Experimental studies have shown that there is no significant difference in gingival irritation as long as the edges of the prosthesis are closely attached and the different alloys, although various