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磷酸锌粘固剂在临床使用较广,但还存在一些缺点:(1)对牙体组织缺乏粘着力;(2)对牙髓有化学和温度损害;(3)抗龋作用小;(4)在口腔中溶解度较高。近来发展的聚羧酸和玻璃离子粘固剂,可解决上述的一些问题。两种粘固剂对清洁的牙本质和牙釉质都有化学粘着力,对牙髓的化学和温度作用较温和。玻璃离子粘固剂在口腔中的溶解度低于磷酸锌粘固剂,而聚羧酸粘固剂的溶解度则高于磷酸锌粘固剂。玻璃离子粘固剂ASPA含有的氟化物在粘固剂凝固后释放缓慢,具有长期的抗龋作用。粘固剂与制备的牙冠表面形成机械锁结,需彻底清洁牙面,去除制备的残屑和剩余的暂时粘固剂以增强固位力。同样,清洁的牙釉质和牙本质面也可改善玻璃离子粘固
Zinc phosphate cement in the clinical use of a wide range, but there are still some disadvantages: (1) the lack of adhesion of tooth tissue; (2) the chemical and temperature damage to the pulp; (3) small anti-caries; (4 ) High solubility in the mouth. The recent development of polycarboxylic acid and glass ionomer cement can solve some of the above problems. Both cements have chemical adhesion to clean dentine and enamel, and have a milder effect on the chemistry and temperature of the pulp. Glass ionomers have a lower solubility in the oral cavity than zinc phosphate cement, whereas polycarboxylate cement has a higher solubility than zinc phosphate cement. The glass ionomer ASPA contains fluoride which releases slowly after the cement is solidified and has a long-term anti-caries effect. The cementing agent forms a mechanical lock with the surface of the prepared crown, which requires thorough cleaning of the tooth surface, removal of the prepared debris and remaining temporary cement to enhance retention. Also, clean enamel and dentin surfaces can improve glass ion bonding