[The significance of the size and type of surface of prepared teeth for retention of permanent dentures fixed with zinc-phosphate cement].
The purpose of this paper was to establish, in vitro, the impact of different sizes and prepared teeth roughness on the adhesion strength with cast crowns. Twenty human intact premolars were used in the experiment. They were prepared and divided into two groups depending on the fineness of diamond prepared instrumentation. Sizes of prepared teeth were calculated mathematically, while the dentine roughness was measured by a profile meter. The cast crowns were made by a standard method for each group. The crowns were then cemented with a zinc phosphate cement. After seven days, testing of prepared teeth and cast crowns bonding strength was carried out mechanically in an electronic dynamometer. On the basis of the obtained results the relationship between the size and the accomplished roughness with the obtained values of the retention forces is observed. At the constant convergence angle of the stamp the retention is proportional to the stamp size and the roughness profile.
Krunić
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D002858:Chromium Alloys; D003442:Crowns; D017268:Dental Prosthesis Retention; D006801:Humans; D008982:Molybdenum; D009532:Nickel; D013499:Surface Properties; D019231:Tooth Preparation, Prosthodontic; D015036:Zinc Phosphate Cement / Q000737:chemistry*
D002858:Chromium Alloys; C070147:nickel-chromium-molybdenum alloy; D015036:Zinc Phosphate Cement; D009532:Nickel; D008982:Molybdenum