Casson A M, Glyn Jones J C, Youngson C C, Wood D J
Division of Restorative Dentistry, Leeds Dental Institute, Clarendon Way, LS2 9LU, Leeds, UK.
J Dent. 2001 Nov;29(8):539-44. doi: 10.1016/s0300-5712(01)00040-9.
This in vitro study investigated the effect of selected luting media on the fracture resistance of a flame-sprayed all-ceramic crown.
Three groups of 10 human upper premolar teeth were prepared for crowning using a standardised technique. Flame sprayed crowns were fabricated and cemented onto the preparations using zinc phosphate (ZPC), glass polyalkenoate (GPC) or composite luting cement (CLC). During crown seating, a pressure perfusion system simulated pulpal fluid outflow equivalent to 300mm of H2O. Compressive fracture resistance was determined for each group using a Universal Testing Machine with a crosshead speed of 1mm min(-1). A group of unrestored teeth acted as a control.
The fracture resistance of the groups ranked as follows: ZPC>CLC>>GPC=unrestored teeth. The difference between the fracture resistance of ZPC and CLC groups and the control group was statistically significant. The mode of fracture between the luted crowns and natural crowns was markedly different.
When tested in compression, a new, flame-sprayed all-ceramic crown, when luted in place using ZPC, GPC or CLC, could produce strengths comparable to or greater than natural unrestored teeth. The luting agent used significantly affected the recorded fracture loads.
本体外研究调查了所选粘结介质对火焰喷涂全瓷冠抗折强度的影响。
采用标准化技术对三组各10颗人上颌前磨牙进行牙冠制备。制作火焰喷涂冠，并使用磷酸锌（ZPC）、玻璃聚烯烃酸酯（GPC）或复合粘结剂（CLC）粘结到制备好的牙齿上。在牙冠就位过程中，压力灌注系统模拟相当于300mm水柱的牙髓液流出。使用十字头速度为1mm/min（-1）的万能试验机测定每组的抗压抗折强度。一组未修复的牙齿作为对照。
各组的抗折强度排序如下：ZPC>CLC>>GPC = 未修复牙齿。ZPC组和CLC组与对照组的抗折强度差异具有统计学意义。粘结冠与天然冠之间的骨折模式明显不同。
在压缩试验中，一种新型火焰喷涂全瓷冠，使用ZPC、GPC或CLC粘结就位时，其强度可与未修复的天然牙齿相当或更高。所用的粘结剂显著影响记录的抗折载荷。
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