•5. Technician fabricates the restoration
(1) Fabrication of metal base crowns
Mainly includes the following steps. 1) working model production: including working model trimming, nail insertion and other nearly ten processes; 2) wax model production: including wax model stacking, back cutting, finishing, sealing, making grip wax model, inserting gating and base; 3) wax model embedding, casting, ring opening, sandblasting, trial casting on working model; 4) polishing; 5) base crown and porcelain bonding surface treatment: fine polishing, sandblasting cleaning, oxidation. A total of nearly 30 processes.
(2) Porcelain layer production
Porcelain layer generally includes opaque porcelain, dentin porcelain, enamel porcelain three layers, need to use porcelain powder after repeated accumulation, sintering formation.
(3) Metal porcelain crowns are tried on the model, stained and enameled.