In the past, the focus of attention to the material can be corresponding to the production of each type of dental products, and for the cleaning of these dental 3D printing materials print out the corresponding dental products, polishing is little attention. There has been little attention paid to the cleaning and polishing of these dental 3D printing materials after the printing of the corresponding dental products. Recently, the UltraPrint series of Hegger Technology has added a new member - a new type of water-washing 3D printing material, which is independently developed by Hegger, and after printing the dental molds, it can be cleaned directly by using the sonic cleaning machine and water, and the whole process can be completed in just a few minutes. It not only improves the safety and biocompatibility of the product, but also simplifies the process steps of post-processing. Avoid the problems of unpleasant odor and environmental pollution brought by the use of alcohol and isopropyl alcohol in traditional cleaning. The above is the post-processing cleaning from the dental 3D printing materials to divide the types, compared to the washing type of new materials to be more environmentally friendly, but based on the specificity of dental 3D printing materials, not all can be made into a washing type.1. 1.1 metal materials: oral medical metal products require metal materials with good mechanical properties, chemical properties, biocompatibility and corrosion resistance. And so on. The requirements for raw materials are also very high, including high purity, low oxygen content, fine powder particle size, plasticity, good fluidity and other characteristics. At present, the 3D printing metal powder materials mainly used in the field of dentistry include: titanium, titanium alloy, cobalt-chromium alloy, stainless steel and so on. Among them, titanium and titanium alloy materials have the advantages of low density, high precision, high strength, and the material has better biocompatibility, which is regarded as a more ideal 3D printing metal material by the field of dentistry. In particular, it is widely used in the fields of restoration of oral and maxillofacial bits, restoration of dental tissues, and related implant manufacturing. Due to the defects of some properties of pure titanium, for example, the strength of pure titanium is not as strong as titanium alloy, and the modulus of elasticity of pure titanium is higher than that of the bone tissue, which can easily lead to the incompatibility of titanium implant and bone tissue and the two produce mechanical stress. Many researchers have tried to improve the performance of pure titanium in various ways, such as adding coatings to its surface or oxidizing the surface of pure titanium, etc. 3D printed cobalt chromium alloy is also a commonly used restorative material in the field of dentistry. Manufactured using 3D printing technology, artificial teeth are then added using restorative techniques so that the restorations have a good fit once they are in the mouth. Since the cobalt chromium alloy denture bracket used and the artificial teeth added are made of different materials, it is basically impossible to print a complete restoration at one time according to the technical facilities at this stage.Traini et al. molded gradientized Ti-6Al-4V titanium alloy porous dental implants, which have more optimized physicochemical properties, with the tensile strength, section shrinkage and elongation up to AMs4999 (U.S.). Figliuzzi et al. used laser sintered personalized titanium alloy (Ti-6Al-4V) implants for immediate implant restorations after extraction of the affected teeth, and the follow-up showed good results in terms of personalized implants and aesthetics.Traini et al. laser sintered titanium alloy specimens, and then measured the modulus of elasticity of the specimen's surface porous layer and the internal dense layer, respectively. Traini et al. measured the modulus of elasticity of the surface porous layer and the internal dense layer of the specimen, and the former was close to the bone cortex, and the latter was close to the machined titanium, which indicated that this method of processing titanium alloy implant can reduce the surface stress, which is conducive to the long-term stabilization of the implant.Mangano et al. used laser-sintered narrow-diameter implant for the posterior dental implant prosthetic treatment for the patients, and the retention rate of the 37 cases of implant was 100.0% after 2 years of follow-up, with a success rate of 94.6%. In terms of physical and mechanical properties, biological corrosion resistance and compatibility, in-depth research is needed to determine whether the metal products concerned by 3D printing are the same as those manufactured by traditional processes and whether they are in accordance with national standards. At present, emerging metal materials in the field of dentistry are still in the state of in vitro research, especially as the performance of oral implant materials still have a lot of research space. At present, 3D printing technology continues to develop, and constantly optimize the performance of the equipment and a variety of metal printing materials, metal 3D printing technology will also be more widely used in various fields of dentistry.1.2 Polymer materials: polymer materials have become the basic mature printing materials in the field of 3D printing at present, plastics, as a representative of the polymer materials, has a better thermoplasticity, mobility and fast cooling adhesion and its rapid curing properties. In addition, due to the good adhesive properties of polymer materials, it can make it possible to form new composite materials with ceramics, glass, fibers, inorganic powders, metal powders, etc. In dentistry, polylactic acid (PLA), polycaprolactone (PCL), and poly(dihydroxypropyl) fumarate (DPHF) belong to the more common 3D printing materials. Polylactic acid (PLA) is an environmentally friendly material with good biodegradability, which can be completely degraded by microorganisms in nature under specific conditions, eventually generating carbon dioxide and water, which will not cause environmental pollution and is very beneficial to environmental protection, and is recognized as an environmentally friendly material. It also has translucency and glossy texture, making it an ideal material for 3D printing in the field of dentistry. Polyether ether ketone (PEEK) is a thermoplastic polymer currently used to make 3D printed satellites, 3D printed car parts, and is beginning to make a real impact in the 3D printing industry.Advantages of the PEEK material include, ① The modulus of elasticity of the PEEK material is similar to that of the human skeleton, and the stress of the skull is intact after the restoration; ② The X-ray transmission performance is good, and does not produce metal artifacts, which does not affect the medical image, and makes it convenient to Detection of post-operative recovery; ③ The structure made of 3D printed PEKK material has better antimicrobial properties than traditional PEEK, which can be sterilized at high temperatures and reused; ④ PEEK itself is highly inert, very little scalp irritation, low rejection and high stability. It is currently used to manufacture denture parts. In terms of the development of 3D printing technology, light-curing stereoforming belongs to the development of the earliest and most mature technology, and has been widely used.3D printing photosensitive resin, i.e., light-curing resin, UV resin, is a widely used polymer material in the field of dentistry. For the field of dentistry, liquid resin materials need to have excellent stability, low viscosity, rapid curing and high degree. It has been found that liquid photosensitive resins can be printed into biodegradable tissue engineering scaffolds, and the scaffolds formed by the use of light-curing rapid prototyping technology have relatively the same mechanical properties as human cancellous bone, and have the effect of promoting fibroblast adhesion and differentiation. The rapid development of light-curing resin materials continue to promote the progress of dentistry, which is conducive to more personalized and precise dentistry.1.3 Ceramic materials: ceramic materials in the field of dentistry require good aesthetics and biocompatibility, with low density, high strength, high hardness, high temperature resistance, corrosion resistance, chemical stability and other excellent physicochemical properties, which are widely used in machinery manufacturing, Aerospace, biomedical and other industries. Because of its excellent mechanical properties and aesthetic properties, it is also used as oral restorative materials. When zirconia ceramic is processed by cutting technology, a lot of material will be removed, resulting in waste, leading to expensive all-ceramic crowns, and there may also be internal cracks caused by cutting force in the denture.3D printed zirconia ceramic denture can reach more than 90% of the utilization rate of the material, which is relatively low-cost.3D printed zirconia can reduce the waste of materials and environmental pollution, and can be realized by printing a special internal structure. bionic nature of mechanical properties such as hardness. Early zirconia 3D printing manufacturing is mainly based on the method of laser sintering, but there are problems such as low densities and forming efficiency of the parts, surface roughness and cracks. Light-curing formed ceramics have good surface quality and controllable structural accuracy, and have rapidly become a research hotspot. At present, there are still some problems in the 3D printing process of zirconia materials, such as high internal stress, easy to produce cracks after sintering and large volume shrinkage, etc. These may affect its mechanical properties and clinical suitability, and the ceramic material and its processing process still need further research.1.4 Biological tissue materials: The use of 3D printing materials and technologies to produce human cells, tissues, and organs with good biological functions has been pursued by many scholars. , is what many scholars have been pursuing. Scholars continue to explore 3D printing technology, and closely integrated with the biological tissue engineering technology, to create artificial cells, tissues and organs with biological functionality to replace the human body needs to repair the defective tissue. Hydrogel is a water-soluble polymer that is produced using chemical or physical cross-linking and is a 3D network structure. Hydrogels have excellent biocompatibility and can be constructed as tissue-engineered scaffolds and can be processed to form carriers for controlled release of drugs. However, currently, hydrogels fabricated by 3D mapping biowriting have low stiffness, which may lead to structural collapse or limit the complexity of shapes, so recent advances in 3D printing biomaterials will advance the progress and development of the field of 3D printing biomaterials. In the field of dentistry, 3D printed products play an important role in dentistry and oral surgery, whether they are patient-personalized biologic tissue materials or existing finished products. At present, 3D printing technology basically realizes the bioprinting of human dental pulp cells (hDPCs), which lays the foundation for a wider application of 3D bioprinting technology to dental tissues. Furthermore, the artificial bone material hydroxyapatite fused with photosensitive polymers can be used to create bone tissue engineering scaffolds containing bioactivity. In implantology, 3D printing of personalized implants has become a trend for immediate implantation. Modification of the surface of titanium implants can promote the growth and differentiation of osteoblasts, and the implants have better characteristics. The roughness of the micron surface generated by 3D printing technology is more easily recognized by specific cells due to its roughness. Implants with micro-nano-composite structures promote cell proliferation and extension, while being more conducive to cell differentiation towards osteogenesis. In the physiological 3D bionic environment provided by the micro-nanocomposite structure, it is more conducive to cell extension and thus better proliferation and differentiation.