2022年醫(yī)學(xué)專題-implant-history-and-development-口腔種植

1、History and Development of Dental implantPrevious non-integrating forms of implants may have been anchored to bone by means of a surrounding sheath of pseudoperiodontal ligament, but this fibrous sheath was a poorly differentiated layer of scar tissue. In most cases, loading and gradual widening of

2、this led to loosening of the implant and subsequent implant failure.第一頁，共十七頁。 ImplantsImplants consist of three main parts.The three components include Implant,abutment and superstructure.第二頁，共十七頁。 Implants Most contemporary dental implants are made of commercially pure titanium, which has been show

3、n to have excellent biocompatibility. Titanium is a light metal. 第三頁，共十七頁。 ImplantsWhen exposed to air, a surface oxide is rapidly formed. This layer of oxide determines the biological response. Commercially pure titanium is also highly resistant to corrosion. 第四頁，共十七頁。ImplantsOther metals have been

4、 used for osseointegration, including zirconium, gold and titanium-aluminium-vanadium alloys. These alloys may strengthen the implant but have been shown to have relatively poor bone-to-implant contact.第五頁，共十七頁。ImplantsImplant design has a great influence on the stability and subsequent function of

5、the implant in bone. The main parameters are implant shape, implant length, implant diameter and surface characteristics. 第六頁，共十七頁。ImplantsRoot-form implants, such as screws and cylinders, are the dominating implant designs todays. Screw implants are considered to be superior to cylindrical ones in

6、terms of initial stability and resistance to compression and tension stresses under loading .第七頁，共十七頁。 AbutmentA dental abutment is typically a machined or custom-made component 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

7、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 time and has a predictable precision fit and good retention.第九頁，共十七頁。AbutmentA customised abutment may be prepable, custom-made in the

8、laboratory or computer-aided design-computer-aided manufacture(CAD-CAM) designed. A prepable abutment is generally supplied by the manufacture as a blank in titanium or ceramic to be modified by the clinician at the chairside or by the dental technician on the master model. 第十頁，共十七頁。 AbutmentCustomi

9、sation in the laboratory typically involves waxing to the required design and casting. A CAD-CAM-designed abutment is produced with specialised computer software and a milling machine.第十一頁，共十七頁。 AbutmentThe selection and use of an abutment is determined by a number of factors, including implant angu

10、lation and orientation, depth of soft tissue from implant body to gingival cuff, aesthetic demands, interocclusal space and preference for a cement or screw-retained prosthesis.第十二頁，共十七頁。 SuperstructureA final prosthesis It may be connected to the implant There are several ways to connect the final prosthesis to the implant: screw retained direct to the implant;Screw retained to the abutment;Lateral/horizontal screw retained to abutment