The Shear Bond Strength of 4-META Luting Cement With cp Titanium Under Thermocycling

Autor: Wen-min Yang, 楊文敏
Rok vydání: 1999
Druh dokumentu: 學位論文 ; thesis
Popis: 87
Resin-bonded fixed prostheses have been widely used in dentistry and commercial pure titanium has been considered as an alternative metal for dental prostheses. The purpose of this study was to evaluate the durability of shear bond strength of c.p. titanium with different metal surface treatments under thermocycling. Type J3 cp titanium was used to cast 270 disks with a 2 x 4.55 mm diameter and 270 cylinders with a 5 x 9 mm diameter. All specimens were subjected to porcelain firing cycles and were divided into two groups as follows: Group I: blasted with 50 micron Al2O3; Group II: blasted with 50 micron Al2O3. Each group was divided into three subgroups as follows: Subgroup A: no further treatment, Subgroup B: blasted followed by tin plating (Kura Ace Mini, Nippon Avionics Co., Ltd. Tokyo, Japan ) and Subgroup C: blasted and applied Alloy primer (Kuraray Co., LTD., Osaka, Japan). 270 casted cylinders were embedded in an epoxy resin. The 4-META resinous cement (Sun Medical Co., LTD, Kyoto, Japan) was selected to bond the casted disk to cylinder. All of the specimens were immersed in 37o C artificial saliva for 24 hours. 0ne-third of the specimens in each group were dipped for 1 minute in 4o C and 60o C artificial saliva for 5000 cycles and another-third for 20000 cycles The shear bond strength was tested and recorded. A three-way ANOVA followed by a Scheffe's test was used to analyze the data. There were no statistically significant differences of shear bond strength among specimens treated with 50 and 250 micron Al2O3 (p>0.05).Both of the Group I- Subgroup A and Group II- Subgroup A were significantly affected by 20000 thermocycles (p0.05). There were statistically significant differences between those tests with 20000 thermocycles between Group I subgroup A and subgroup C and Group II subgroup A and subgroup C(p
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