The Comparison of Adaptation of Plat-ⅡCastable Ceramic Crowns Made by Three Methods / 中山大学学报(医学科学版)

ABSTRACT

【Objective】To improve the adaptation of Plat-Ⅱceramic crown.【Method】The Plat-Ⅱcastable ceramic crowns were made by three methods,namely routine method,die spacer technique,and the model investing method.24 crowns were made by these three methods individually and adhered to the corresponding model die with zinc phosphate to measure the adhesive thickness and compare their adaptation.【Result】The average adhesive thickness at different parts of crown of these three groups were 52 μm、42 μm、30 μm and the margins discrepence were 63 μm、59 μm、42 μm,respectively.There is statistically difference in both the adhesive thickness and the margin discrepence with these three methods (P<0.01).【Conclusion】The crowns made from the die spacer technique and the model investing method could improve the adaptation significantly.