Effect of convergence angle and luting agent on the fracture strength of In ceram crowns

被引:4
作者
Correr Sobrinho L. [1 ,3 ]
Consani S. [1 ]
Knowles J.C. [2 ]
机构
[1] Department of Biomaterials, Piracicaba Dental School (UNICAMP), Avenida Limeira, 901, Piracicaba-SP
[2] Department of Biomaterials, Eastman Dental Institute, 256 Gray's Inn Road
[3] Department of Biomaterials, Eastman Dental Institute, 256 Gray's Inn Road
基金
巴西圣保罗研究基金会;
关键词
Polymer; Phosphate; Zinc; Statistical Difference; Testing Machine;
D O I
10.1023/A:1008905210614
中图分类号
学科分类号
摘要
This study compared the fracture strength of In ceram crown shapes fabricated with either 8 or 16°total occlusal convergence; and attached with either a commercial zinc phosphate cement or a glass ionomer cement. Thirty crown shapes (8 mm diameter and 8.5 mm high) were fabricated for each preparation design on a brass master die with approximately the same dimensions as a premolar. In ceram crown shapes were luted on to the die using zinc phosphate or glass ionomer. The crown shapes were fractured in a testing machine (Instron) using a steel ball, 4 mm in diameter, that contacted the occlusal surface and the resulting data were statistically analyzed using a Mann-Whitney test. The results indicate that there is no statistical difference in the fracture strength values between preparations with 8°total convergence compared with 16°using the same cement. However, crown shapes luted with zinc phosphate on preparations with 8 and 16°total occlusal convergence were significantly stronger than those luted using glass ionomer cements (p < 0.05).This study compared the fracture strength of In ceram crown shapes fabricated with either 8 or 16° total occlusal convergence; and attached with either a commercial zinc phosphate cement or a glass ionomer cement. Thirty crown shapes (8 mm diameter and 8.5 mm high) were fabricated for each preparation design on a brass master die with approximately the same dimensions as a premolar. In ceram crown shapes were luted on to the die using zinc phosphate or glass ionomer. The crown shapes were fractured in a testing machine (Instron) using a steel ball, 4 mm in diameter, that contacted the occlusal surface and the resulting data were statistically analyzed using a Mann-Whitney test. The results indicate that there is no statistical difference in the fracture strength values between preparations with 8° total convergence compared with 16° using the same cement. However, crown shapes luted with zinc phosphate on preparations with 8 and 16° total occlusal convergence were significantly stronger than those luted using glass ionomer cements (p<0.05).
引用
收藏
页码:493 / 496
页数:3
相关论文
共 19 条
  • [1] Scherrer, S.S., Rijk, W.G., (1992) Int. J. Prosthodont, 5, p. 550
  • [2] Dodge, W.W., Weed, R.M., Baez, R.I., Buchanan, R.N., (1985) Quintessence Int., 3, p. 191
  • [3] Dykema, R.W., Goodacre, C.I., Phillips, R.W., (1986) Johnston's Modern Practice of Fixed Prosthodontics, 4th Edn., , W. B. Saunders, Philadelphia, PA
  • [4] Tylman, S.D., Malone, W.F.P., (1978) Tylman's Theory and Practice of Fixed Prosthodontics, 7th Edn., , C. V. Mosby St Louis, HO
  • [5] Kent, W.A., Shillingburg H.T., Jr., Duncanson, M.G., (1988) Quintessence Int., 19, p. 339
  • [6] Malament, K.A., Grossman, D.G., (1987) J. Prosth. Dent., 57, p. 674
  • [7] Malament, K.A., (1988) Int. J. Periodont Rest. Dent., 8, p. 32
  • [8] Friedlander, L.D., Munoz, C.A., Goodacre, C.J., Doyle, M.G., Moore, B.K., (1990) Int. J. Prosthodont, 3, p. 159
  • [9] Doyle, M.G., Munoz, C.A., Goodacre, C.J., Friedlander, L.D., Moore, B.K., (1990) Int. J. Prosthodont, 3, p. 241
  • [10] Brukl, C.E., Ocampo, R.R., (1987) J. Prosth. Dent., 57, p. 404