4D+ Multilayer Zirconia Block
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Zirconia block User Instruction（4D+ ML） [Before use] Zirconia blocks are produced by CIP technology and pre-sintered in low temperature. Although the product has some strength, because of porosity, please handle carefully. When you receive the product, please check as below. If there is something exceptional, please contact the sales manager. 1.Product is complete without any damage. 2. The packing is complete without any damage. 3. Label: company name, product name, batch number, inspectors and inspection date. [HaHasmile 4D+ ML Material Usage and Technical Parameters] Materials function The zirconia can be used to manufacture crown, the bridges andother restoration. Chemical Composition and Powder Characteristics Chemical Composition Mechanical Property Aging Properties Chemical Solubility Sintered Density Flexural Strength Fracture Toughness [Indications] veneer, inlay, onlay, anterior crown and bridge ,posterior crown and bridge [Requirements for preparation] HaHasmile 4D+ ML zirconia is not suitable for non-shoulder preparation or shoulder with slant. Since both ways will lead to a thinner eage and risk of fracture. Veneer: If possible, the preparation should be only for enamel. The margin of incisal cannot be prepared on the occlusal surface or zone where changes a lot. The preparation for incisal edge, labial surface, and cervical is at least 0.4 mm. The inner edge of shoulder must be slick or be fluted. Suggested to make wrapping type. Anterior crown: The inner edge of shoulder must be slick or be fluted. Preparation wideth of incisal, labial and palatal should be above 0.7mm. The axial wall must be blunt to ensure the zirconia can reach an ideal milling effect with CAD/CAM. 1.0 Anterior crown Full contour Full contour: The inner edge of shoulder must be slick or be fluted. The minimum width of incisal edge, labial side, and palatal side is at least 0.7 mm. Width of occlusal surface of lateral side of the lip,tongue preparation is more than 1.0mm. The axial wall must be blunt to ensure the zirconia can reach an ideal milling effect with CAD/CAM. [Application method] Full contour crown and bridges(veneer): Scanning →Designing→Milling→Cleaning→Sintering→ Polishing→Staining→Finishing 1.Scanning Scanning the butment： Scanning the base one by one. Making sure that the base shouldmake a full contact with model. 2.Designing Veneer： The veneer should be no less than 0.4mm; the adhesive clearance is 0mm. The more 0.1~0.2mm should be considered,when the margin is design. Coping： The thinnest should be no less than 0.8mm. Increase compensation data of the Milling Burs.It is an effective way to easy the condition that the anterior cannot match the veneer of butment well due to the keenness of the veneer of butment. The tip of the butment should be filled with wax, and then processing the scanning and designing. 3. Milling When making restorations by using HaHasmile zirconia ceramic materials, make sure that a new bur should be used. And to cool zirconia by using liquid is avoided when doing milling process. After milling is finished, check that if there are any defects happening listed below: Is there any crack? Is there any contamination? Is there any break? If any of these defects happen, reasons must be found and restorations need to be milled again. Layout: Choose zirconia block of suitable thickness. When layout, put data in the middle of disc（vertical direction）. The distance between restorations data and disc surface should be at least 1mm. Connector should be placed in the most protruding position on buccal side. The thickness of connector should be2mm. (as picture shows) Place the disc: Directing arrow is seen on the side of “Multilayer” disc. The arrowpoints at the direction ofincisal, namely the part of disc showing shallower color. 4. Separation of Restoration and Cleaning Separation of restoration: Using technician specialized hand piece and grinding head to separate restorations from blocks. Before grinding, a towel should be put on the desk to avoid restorations dropping on desk and crack or break.When operating, hand needs to find a fulcrum: hand piece speed should be controlled at 10000-12000rev/min. And then the connector need to be polished successively in one direction. Don’t separated one connector completely off at one time; Finally, the rest of connector could be polished slightly.It is not advised to make too much adjustment on the restoration

Cleaning: Cleaning up the powder on surface and inner side of restorations with brush. If cleaning is not thorough, uncleaned powder will contaminate color liquid when dyeing and the uncleaned powder will stay on the surface and inner side of restorations after high temperature sintering, forming white spots and therefore having negative effect on esthetics and postiioning of restorations. 5. Sintering Step 1: check the zirconium beads Firstly, inspect the color, shape, number of the zirconium beads. If the yellowing and mutilated zirconium beads are found, they should be replaced...