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characteristics. 第六頁,共十七頁。 Implants ? Rootform implants, such as screws and cylinders, are the dominating implant designs todays. ? Screw implants are considered to be superior to cylindrical ones in terms of initial stability and resistance to pression and tension stresses under loading . 第七頁,共十七頁。 Abutment ? A dental abutment is typically a machined or custommade ponent that connects the final prosthesis to the implant. The abutment may be made from a variety of materials. 第八頁,共十七頁。 Abutment ? A machined abutment is typically manufactured from titanium, gold or ceramic. ? The advantages are that it is simple to use, requires minimal chairside and laboratory