瓷睿刻系统牙体制备原则.ppt

1、CAD/CAM General Preparation Guidelines,Enjoy every day. With Sirona. William Wang 王建刚,2,Information for the Dental Practice,Questions dentists could ask Preparation guidelines Adhesive bonding,3,General Preparation Guidelines for Ceramic Materials,Occlusal and approximal boxes should have flat bases

2、 and vertical walls Rounded transitions should be crested between the base and the wall and between the proximal and the occlusal box The outline should be smooth without any sharp edges Pronounced chamfering Shoulder preparation,Chamfer,Shoulder preparation,4,Preparation Rules for Inlays / Onlays,M

3、inimal depth at the bottom of the fissure: 1,5 mm Minimal depth at the margin: 2 mm (if close to a cusp tip: 2,5 mm) The cervical step has to be separated from the proximal tooth. Minimal width of the proximal step: 1,5mm Angle between lateral wall of the proximal box and the proximal surface: 60,5,

4、Preparation Rules for Crowns,Preparation of anterior crowns Incisal 1,5 mm, circular 1,0 mm Crown margin 0,8 mm Preparation of posterior crowns Occlusal (fissure) 1,5 mm Occlusal (cusp) 2 mm Circular 1,0 - 1,5 mm Crown margin 0,8,6,Preparation Rules for Veneers,Thickness 0,5 mm (safe adhesive bondin

5、g) Labial 0,5 mm, keep vestibular tooth contour Cervicalslightly rounded shoulder or chamfer, supra-gingival parallel to the gingiva Proximalchamfer-like, keep - if possible the natural contact points Incisalwithout prolongation (1) slight reduction for individual characterization (2) flattened inci

6、sal edge for prolongation (3),7,Finishing,Source: Ivoclar Vivadent,Sprue location removal Recommended grinding instrument: Disk (no carbide instruments!) The smaller the diameter of the disk, the lighter the vibrations Minimal pressure and ample water cooling Manufacturer: Komet Brasseler, Eve, Jota

7、, Bredent etc.,8,Extraoral Polishing,Contouring with fine grain diamond instruments (40m) and pre-polishing with fine diamond instruments (8m) Polishing of proximal areas and bigger surfaces with Al2O3 coated flexible discs, polishing brushes and diamond polishing paste,Source: Ivoclar Vivadent,9,In

8、traoral Polishing,Fine tuning of occlusion/articulation with fine diamond Finisher F (light blue) 15.000 rpm, water cooling Polishing with polisher P (dark blue) 15.000 rpm, water cooling Mirror finish High polish brush and diamond polishing paste HP (w/o water cooling),Source: Ivoclar Vivadent,10,G

9、lazing,Even application of glaze on the complete outer surface of the restoration Many glaze sprays also available,Source: Ivoclar Vivadent,11,milled,glazed,Characterization,stained + glazed,Source: Ivoclar Vivadent,12,External Shading of Veneers,Source: Ivoclar Vivadent,Staining and glazing with IP

10、S Empress Universal Shades und Stains High aesthetics of the chairside produced restoration Application on the outer surfaces of the restoration,13,External Shading of Veneers,Source: Ivoclar Vivadent,Shades reproduce the chroma scope and A-D colors Stains characterize the restoration and lead to a

11、more natural appearance Shades and stains are fired in a ceramic furnace,14,Internal Shading of Veneers,Characterizations with Tetric Color without furnace The inner surface of the veneer is characterized with the light curing Tetric Color shades Tetric Color can be applied very precisely with the e

12、xtra fine application needle,Source: Ivoclar Vivadent,15,Cut-back Technique,Veneers or anterior crowns should look like the definitive tooth form before cutting-back Individual characterization by cutting-back the incisal third and preparing mamelons. Extraordinary aesthetics, natural fluorescence a

13、nd opacity,16,Adhesive Bonding,Use an adhesive bonding system There is strong evidence that compared to “one-bottle” products - multi-step adhesives achieve enhanced adhesion to the enamel and the dentine The bonding performance of self-adhesive luting composites is on par with multi-step products,17,The CEREC Crown for Everyone,Source: Ivoclar Vivadent / Dr. Kurbad (Germany),18,18,CEREC Optispray,The most important product features Color easily visible thin blue colored coating Precision a thin homogeneous layer ensures high-precision