CAD CAM Dental Laboratory Consumable Materials dental PMMA Block

1. Specifications and sizes
Size diversity:
Common diameters: There are usually a variety of diameters to choose from, such as 98mm, 71mm, 95mm, etc. Different diameters can be adapted to dental CAD/CAM equipment of different models and processing platform sizes, which is convenient for dental laboratories to flexibly select according to their own equipment configuration.
Thickness specifications: There are also a wide range of thickness options, ranging from 10mm to 25mm. For example, when making a single crown, a relatively thinner specification can be selected, while when constructing complex restorations such as multi-unit dental bridges, thicker blocks can be selected.
Dimensional accuracy: Each piece of PMMA block has strict dimensional tolerance control. The dimensional tolerance of its diameter is generally controlled within ±0.1mm, and the tolerance of thickness is controlled within ±0.05mm. Such precise dimensional specifications ensure the good compatibility between materials and equipment during CAD/CAM processing, as well as the dimensional accuracy of the restoration after processing, thereby improving the quality of the restoration and its fit with the patient's mouth.
2. Material characteristics
High-quality PMMA ingredients:
Material source and purity: High-quality polymethyl methacrylate is used as the basic raw material. These raw materials usually come from suppliers that have been strictly screened and have a good reputation. The purity of the raw materials is as high as 99% or more, which effectively reduces the impact of impurities on material properties and ensures the stability and reliability of the material during processing and use.
Chemical stability: PMMA itself has excellent chemical stability. In the complex chemical environment of the oral cavity (such as contact with saliva, various ingredients in food, etc.), it is not easy to undergo chemical reactions, discoloration, deformation, etc., and can maintain the original performance and appearance of the restoration for a long time, providing patients with a lasting restoration effect.
3. Physical performance advantages:
Balance of hardness and toughness: The hardness is between 80-100 Shore D. This hardness allows the material to maintain a good shape during processing, which is convenient for milling, carving and other operations. At the same time, it has sufficient toughness and is not prone to brittle cracking. Even under large bite forces (such as the force generated during normal chewing), it can effectively resist fracture and ensure the integrity of the restoration.
Appropriate density: The density is between 1.18 - 1.20 g/cm³. The moderate density does not cause excessive burden on CAD/CAM equipment during processing. At the same time, it can make the produced restoration have a suitable sense of weight in the mouth, which will not bring obvious foreign body sensation to patients and improve the comfort of wearing.
Good optical performance: It has high transparency and refractive index, and its light transmittance can reach about 80% - 90%, which makes the produced restoration closer to natural teeth in appearance. When light passes through, it can show natural luster and color, enhance the beauty of the restoration, and help to achieve better aesthetic restoration effect.
IV. Processing performance:
Precision processing guarantee: During the milling process, the material shows excellent machinability, and there will be no problems such as adhesion of tools, edge collapse, and block drop. It can achieve fine processing with a minimum processing accuracy of ±0.02mm.
Adaptability to manual processing: In addition to being suitable for CAD/CAM processing, the PMMA block also has good manual processing performance for some situations that require manual adjustment or fine modification. For example, it can be polished and carved using conventional dental carving tools. The material has a uniform texture, making it comfortable to touch during manual operation, and can easily achieve the shapes and details that the technician wants to shape, further improving the production effect of the restoration.

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