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陶瓷作为一种牙科材料,由于其具有类似牙釉质的光泽、热膨胀系数、稳定的色泽和良好的组织相容性,近三十年来其在牙科修复领域,尤其是美容牙科方面得到了广泛的应用.陶瓷修复材料的种类,制作工艺也得到了相应的发展.无论是烤瓷修复体,还是铸造陶瓷修复体,在制作过程中陶瓷材料的冷却收缩都可导致修复体边缘的变形,加之其制作工艺技术上的误差,使得修复体边缘与牙体不密合.CAD—CAMM制作系统中,制作技术也是影响修复体边缘准确性的主要因素之一.这种边缘的不密合,使得粘固剂暴露于唾液中,易产生边缘徽漏,导致食物残渣及菌斑在修复体边缘的堆积,给牙周组织带来不良刺激以及根面龋或继发牙折的发生.Marco等认为修复体边缘是影响修复体寿命的最薄弱环节,也是修复体成败的关键.
As a kind of dental material, ceramic has been widely used in the field of dental restoration, especially cosmetic dentistry for its similar enamel luster, thermal expansion coefficient, stable color and good histocompatibility The type of ceramic repair materials, the production process has also been the corresponding development.Either the porcelain restoration, or casting ceramic prosthesis, during the production of ceramic materials, cooling and shrinkage can lead to deformation of the edge of the prosthesis, combined with its production Process technology errors, making the edge of the prosthesis is not intimate with the tooth .CAD-CAMM production system, the production technology is also one of the main factors affecting the accuracy of the prosthesis edge. This edge is not close, making the cement Agents exposed to saliva, easy to edge edge leakage, leading to the accumulation of food debris and plaque in the edge of the prosthesis, to the periodontal tissue to bring adverse stimuli and root caries or secondary teeth occur.Marco so that prosthesis The edge is the weakest link that affects the lifespan of the prosthesis and is the key to the success or failure of the prosthesis.