Artificial dental implant restorations are indispensable in the modern dental field. Implant restorations for patients with missing or defective teeth have been universally accepted and have greatly improved the quality of life of patients. With the increasing aesthetic requirements, the upper part of the implant fixed restoration technique, has gradually become the ideal method to achieve the effect of natural tooth restoration. The fixed restoration of artificial dental implants is divided into metal porcelain restoration and all-ceramic restoration. Metal fused porcelain full crown 1, the characteristics of metal fused porcelain full crown: metal porcelain restoration is currently the most common fixed restoration method, with beautiful, good fracture strength, smooth surface and wear-resistant characteristics. General implant porcelain restoration can only be used to meet the international biological standards of precious metals or pure titanium metal made of porcelain base crown bridge, because non-precious metals such as nickel-chromium alloy porcelain biocompatibility is poor, and the production accuracy can not meet the requirements of the implant restoration. Gold porcelain restorations have great advantages in terms of being used as implant prosthetic superstructures. Because the base of the restoration is metal, which affects its light transmission, the color is not very good, especially many patients to non-precious metal porcelain restorations often allergic reactions lead to gingival margin discoloration. These factors have promoted the development and application of all-ceramic crowns with higher aesthetic effects. 2, implant metal porcelain crown restoration defects: metal porcelain crown bridge due to the presence of metal crowns, resulting in the optical effect of the restoration is different from the natural teeth, the metal color may still affect the aesthetics through the all-porcelain; in order to obtain good aesthetic results, to avoid the exposure of the metal crown of the front teeth, the edge line of the porcelain crown must be located under the gingiva, so the soft tissue around the implant not only wrapped around the abutment but also around the edge of the crown This makes the cleaning of the implant difficult, thus making it easy to form deeper periodontal pockets; when the gingival tissue is thin, the color of the metal abutment will show through, thus affecting the aesthetic effect of the gingiva, the red part of the implant restoration. Second, the all-ceramic restoration of dental implants With the continuous improvement of the strength of ceramic materials, all-ceramic restorations applied to the upper structure of the implant prosthesis, more and more foreign all-ceramic materials and equipment into China, not only can process high strength zirconia porcelain, but also titanium, there are all-ceramic system will be designed and made separately, the clinical will be scanned model data through the Internet to the production center, in the production center Large equipment to complete the inner crown production, with express mail to send the inner crown to the user, continue to complete the processing of surface decorative porcelain, such a production method to ensure the standardization of the inner crown, high precision, but also to meet the individual needs of patients on the color and shape of the restoration, to achieve industrial mass production, all-ceramic restoration of this clinical technology has been introduced into the implant restoration process in a comprehensive manner. 1, the composition of the implant all-ceramic restoration: (1) implant (universal implant); (2) metal connector and central screw; (3) titanium metal abutment or zirconia all-ceramic abutment; (4) all-ceramic crown: is processed by the technical office with all-ceramic system for the patient individually, their connection is: the metal connector and all-ceramic abutment with a special resin adhesive bonding, with a longitudinal central screw and the implant The all-ceramic crown is then bonded to the all-ceramic abutment with a resin bonding agent. 2, the advantages and indications of all-ceramic restoration of implants: All-ceramic crowns have excellent biocompatibility, excellent corrosion resistance, its surface is less plaque aggregation, the underlying crown has X-ray transmissive, easy to observe the dental tissue, become the material of choice for permanent crowns of implant restorations. The use of gum-colored dental materials restores both the natural gingival structure and replaces the lost gingival papillae. The all-ceramic restoration of implants has outstanding restorative effects in terms of aesthetics: (1) the crown has a realistic aesthetic effect; (2) the gingiva does not show through the metal color; (3) the cervical edge of the crown can be flush or gingival, ensuring the relative health of the tissue around the implant; (4) to achieve the desired aesthetic effect should be restored with an all-ceramic crown on a porcelain abutment. Indications: It is suitable for the implant restoration of individual anterior teeth and premolar teeth. Implant requisites: In terms of implant systems, implant requisites: good occlusal relationship, implant diameter: at least 4.5 mm, implant and clinical crown basically no angle or angle of about less than 15 degrees. Third, the implant CAD/CAM zirconia all-ceramic restoration technology points 1, indications and characteristics: CAD/CAM zirconia all-ceramic restoration is suitable for crown and bridge restoration of implant prostheses, especially for all-ceramic crown and bridge restoration on porcelain abutments. The aesthetic effect than the precious metal base porcelain has greatly improved, but because zirconia is a translucent material, and light transmission effect and porcelain thickness, so with a similar IPS-Empress2 lithium-based porcelain full crown restoration slightly different CAD/CAM zirconia all-ceramic crown brightness, light transmission moderate, so when the adjacent teeth brightness is high, light transmission moderate, preferred zirconia all-ceramic; especially the color of the abutment teeth are not the same, the When the natural teeth and implants are restored at the same time, CAD/CAM zirconia all-ceramic should be used to avoid different colors of the preparatory body, affecting the final restoration effect. Bonding agent cast porcelain all-ceramic restorations are best used with matching resin bonding agent, zirconia all-ceramic available with any bonding agent, but the recommended resin bonding agent, the application of water mending bonding will affect the translucency of the denture. IPS-Empress2 lithium-based porcelain all-ceramic crowns with low lucency and good transparency. 2, the production process: the conventional production of implant impressions, irrigation model, selection of matching porcelain abutments, conventional adjustment of abutments, full-shoulder abutments, clinical trial, according to different CAD/CAM system scanning model or wax type. Make CAD/CAM zirconia all-ceramic abutment crown or bridge, after suitable, make CAD/CAM zirconia all-ceramic crown bridge, clinical wear, tighten longitudinal screws according to the requirements of the implant system, resin bonding all-ceramic crown bridge. 3, all-ceramic restorations using bonded retention: under the condition that the angular direction of implant placement allows, bolt retention can also be used. If the use of bolt retention, the finished porcelain abutment can be directly stacked porcelain, and then use the central bolt of the abutment directly fixed denture, the advantage is to avoid the central bolt loosening and damage to the all-ceramic crown. Fourth, the abutment of porcelain implant restoration The abutment of porcelain implant restoration is divided into all-porcelain abutment and metal abutment, porcelain abutment is divided into aluminum oxide abutment and zirconia abutment. 1. Titanium metal abutments Sometimes the reduced transparency of the gums and the gray gum profile are seen, and the soft tissues of the neck may not be color coordinated when using titanium abutments for implant restorations. The color and light blocking effect of traditional metal abutments make it difficult to achieve the desired aesthetic effect, making their wide application limited. If the implant restoration applies metal abutments and all-porcelain crowns, i.e., all-porcelain crowns are bonded directly to the metal abutments of the implants, as with implanted metal porcelain crown and bridge restorations, the reveal of the metal abutments can affect the aesthetics. 2, porcelain abutments The introduction of all-porcelain abutments for implant restorations has made it possible to use all-porcelain abutments for implant restorations in the clinical setting, to produce personalized all-porcelain crowns on all-porcelain abutments, to overcome the shortcomings of metal abutments for metal porcelain crowns and bridges, and to improve the restorative effect. At present, there are two kinds of porcelain abutments on the market: alumina and zirconia, which basically meet the clinical requirements, and all-porcelain restorations of implants are also gradually promoted and applied in China. The earliest clinical application is the dense sintered alumina porcelain abutment. The current application is more zirconia porcelain abutments. The use of alumina or zirconia abutments can make the restoration more compatible with the adjacent anatomical structures, with a natural morphology, and the custom-made abutments have the right size, can match the tooth color, so that the mucosa gingiva at the more beautiful. Advantages of porcelain abutments: (1) high strength, good toughness, can withstand large HE forces; (2) no current phenomenon; (3) highly infiltrative, conducive to gingival healing; (4) highly polished, reduce plaque aggregation; (5) have a high strength shoulder and thin abutment biscuit, can be easily and quickly personalized adjustment. The ideal choice at present is a personalized, adjustable cast porcelain or all-ceramic abutment. Porcelain abutments are suitable for the anterior region and have good aesthetic results. Aluminum dioxide abutments are mainly used for bridges with normal occlusion, single or short aesthetic areas, and lower fracture resistance than titanium abutments; the most discussed and used in recent years are zirconia porcelain abutments that can achieve ideal retention and aesthetic restorations. Zirconia ceramics can also be used for restorations in the posterior region. Due to the cylindrical structure of the finished porcelain abutment, it is often necessary to adjust the cutting according to the size of the implant’s labial and lingual inclination in practice. If the cutting process is not performed properly, the strength of the porcelain abutment may be reduced.