The retentive ability of various cementing agents for polycarbonate crowns.
The following conclusions may be made within the limitations of this investigation. - A composite resin processed directly against a roughened stainless steel dye, similar in shape to a primary anterior tooth, which has been shaped to receive a polycarbonate crown, shows the highest retentive force measured in pounds per square inch (psi). - A polmethacrylate resin, when used as a cement, also shows high values, probably due to its ability to unite chemically with polycarbonated acrylic and to its low film thickness. - Composite resins of low viscosity, low film thickness, and high compressive and tensile strengths proved also to provide good retentive values and would contribute insolubility to a greater degree than the unfilled resin. - Polycarboxylate, zinc phosphate, and reinforced zinc oxide-eugenol cements are not to be recommended as agents for cementing polycarbonate crowns. - It can be recommended on the basis of retention only, composite crowns should be fabricated directly onto the tooth preparations of carious primary anterior teeth.
D002254:Carbonates; D003188:Composite Resins; D003442:Crowns; D003738:Dental Cements; D003799:Dental Stress Analysis; D008768:Methylmethacrylates; D011108:Polymers; D013223:Statistics as Topic; D015035:Zinc Oxide-Eugenol Cement
D002254:Carbonates; D003188:Composite Resins; D003738:Dental Cements; D008768:Methylmethacrylates; D011108:Polymers; D015035:Zinc Oxide-Eugenol Cement