CAMLOG Hybrid Restorations

33 HYBRID RESTORATIONS WITH THE CAMLOG ® IMPLANT SYSTEM After wax-up of the bar framework, a suitable agent must be used to clean the fine gold margin and the area of the implant shoulder support of sepa- rating medium and wax particles (e.g. with a cotton swab soaked in alco- hol). EMBEDDING AND CASTING The abutment is embedded according to the instruction manual of the muf- fle system used. We do not recommend the use of a wax wetting agents. The fine film from the agent can lead to a surplus of cast-on alloy on the margin or on the implant shoulder support. When embedding, the correct placement of the wax-up in the casting muffle is of importance. Volume ra- tios and pin angles must be selected so that the required temperature for formation of a metallic connection is achieved. This is particularly impor- tant for voluminous casts. The investment compound must be matched with the cast-on alloy and the casting alloy used. We recommend phosphate bound investment materials. The manufacturer's processing instructions must be observed and the mix- ing ratios and preheating times accurately observed. We recommend you do not use any investment materials for the quick heating processes (speed investment materials). The cast delay time must be kept as brief as possible. INSTRUCTIONS FOR THE CAST-ON ALLOYS The casting alloy may not exceed the liquidus temperature of 1350°C (2462°F) in its melting range. The melting range of the high-melting cast- on gold alloy lies between 1400°C– 1490°C (2552°F–2714°F). The casting alloy must contain gold in its components and be compatible with the high-melting cast-on gold alloy. Observe the instructions of the alloy manufacturer. The use of other cast-on alloys is not recommended because gold alloys with nickel or cobalt components can destroy the base part. Components of an unsuitable alloy can lead to phases with reduced corrosion resistance, less stability or a low melting range thanks to "diffusion processes" in the border zone "casting alloy/cast-on alloy". DEVESTMENT After casting, the cast object must be slowly cooled to room temperature and the object gently devested. IMPORTANT NOTE Never use sandblasting to devest the cast; this would destroy the pre- cise fit on the CAMLOG ® bar abutment shoulder (precision fit reduced, poor margin fit)! We recommend gentle devestment in an ultrasonic bath with waterjet or stripping. CASTING QUALITY If the cast object exhibits casting defects after devestment such as incom- plete distribution or casting fins/bubbles over the margin onto the implant shoulder support, the work should be repeated. The precision of the prefab- ricated bar base is severely affected and also the long-term success of the prosthetic restoration. The bar framework must be seated tension-free on the CAMLOG ® bar abutments. The secondary framework, e.g. electroplating technique, is then fabricated. INSERTING THE BAR CONSTRUCTION The CAMLOG ® bar abutments are transferred from the working cast to the CAMLOG ® implants and screwed in with the prescribed torques. The fin- ished bar construction is transferred to the CAMLOG ® bar abutments and fixed with new unused prosthetic screws, using a screwdriver (hex) with 15 Ncm. The newly created full denture is then inserted and checked for proper fit.