Comparison of Four Commercially Available Posterior Primary Esthetic Stainless Steel Crowns

Objective. To determine which of the veneered primary stainless steel crowns demonstrate the greatest resistance to dislodgment and to characterize the bond failure. Background. There is a growing demand from parents to provide more esthetic restorations. We need an alternative besides SSC. Veneer primary molar esthetic stainless steel crowns have recently appeared on the market. There are few literatures on the performances of these crowns but none compare the different brands from different companies. Methods. Ten of the same sized preveneered primary molar stainless steel crowns will be purchase from four different laboratories. The four laboratories will be tested are: Dental Innovators, Cheng Crowns, NuSmile Crowns, Kinder Krowns. Only full porcelain coverage primary molar stainless steel crowns will be used. A master die will be fabricated with preparation and reduction specified in text books. Ten duplicate dies will be fabricated from this master prepped die. Each veneered crown will be luted with Fuji glass ionomer cement onto one of the ten prepared cast die. The crowns will be allowed to set for twenty-four hours. The crowns will then be thermocycled at 4° C and 55° C for 500 1-minute cycles. Each die will be placed on a mechanical testing machine with a compressive load (N) applied along the long axis of the specimen at a crosshead speed of 1 mm/min until fracture. Failure loads (N) will be recorded for each specimen. Failure will be classified as complete dislodgement of the facing of the preveneered crowns. Results. Will be presented at Research Day. Conclusions. Will be presented at Research Day. Grants. The study was funded by NSU HP