WO2021056367A1 - Customized multi-hole dental bridge based on additive or subtractive processing mode and manufacturing method therefor - Google Patents
Customized multi-hole dental bridge based on additive or subtractive processing mode and manufacturing method therefor Download PDFInfo
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- the present invention relates to the technical field of medical supplies, and in particular to a customized porous dental bridge based on a processing method of adding and subtracting materials, and a method for manufacturing the porous dental bridge.
- This advanced dental implant restoration method can reduce the implantation of dental implants, reduce the risk of dental implant restoration, and save costs for patients.
- Bridge restoration is a method of denture restoration technology. It mainly uses natural teeth or implants at the two ends or one end of the missing tooth gap as abutments. The retainers of the denture are made on the abutment and connected with the artificial teeth. As a whole, the denture crown is cemented on the bridge with cement, and the patient cannot remove it by himself. This kind of restoration method can fill the missing position of the tooth, prevent the displacement of adjacent teeth, avoid irregular teeth and abnormal occlusion, and restore the chewing, pronunciation and appearance of the teeth.
- Dental bridge is a kind of dental restoration with aesthetic effect. It has the advantages of hardness, wear resistance and high compressive strength. It can be made of gold, alloy, porcelain or a combination of these materials. The required supporting force is natural teeth or implants. Body provided.
- the traditional methods of making dental bridges are wax casting (additive material) and cutting processing (subtractive material).
- the wax casting method relies heavily on manual operations and usually takes 3-7 days to complete. The process is cumbersome, time-consuming, and the yield is low. , hardly affect the aesthetics of dental implants, and even surface defects (such as trachoma shrinkage, etc.).
- the cutting manufacturing method greatly saves time and labor, and ensures the accuracy of the shape and size of the bridge, it can only process the bridge with a relatively regular shape and structure, and the finished bridge is heavier and has a modulus of elasticity. It is high, which is quite different from the bone tissue, and the pressure on the patient's alveolar bone after implantation in the oral cavity is greater, which will cause discomfort to the patient.
- the dental bridge in the prior art can only be manufactured by a processing method of adding or subtracting materials, the manufactured dental bridge may have defects corresponding to the processing method.
- the purpose of the present invention is to provide a customized porous dental bridge manufacturing method based on the increase and decrease of material processing method, which realizes the increase and decrease of material manufacturing of the bridge through metal 3D printing and CNC cutting processing, and solves the problem of manufacturing bridges in the prior art. The flaws that exist.
- a method for manufacturing a customized porous dental bridge based on a processing method of adding and subtracting materials includes the following steps:
- the digital model of dental bridge includes digital model of dental bridge and several digital models of positioning support rods. Import interface data to determine the digital model of dental bridge. A single-sided and/or bilateral positioning support rod digital model is added to the abutment.
- the positioning support rod digital model includes a positioning boss and a support rod. The outer contour of the positioning boss is a regular polygon with a surface and a bottom surface penetrating through the middle. The two ends of the support rod are respectively connected with the digital model of the dental bridge and the positioning boss;
- step 3 Perform porous treatment on the dental bridge STL digital model prepared in step 2: Fill the crown without implant on the upper part of the bridge shoulder with porous structure, the filling volume is 50% to 70%, and the pore diameter is 0.5mm to 1mm;
- step 5 Import the STP solid model into ANSYS Workbench software for finite element analysis, and perform a simulation analysis of the force and stress distribution of the STP solid model under the load of bite force. According to whether the simulation analysis result meets the requirements for use, if it does not meet the requirements for use Then return to step 3 to correct the filling volume and/or pore size of the porous structure of the bridge STL digital model;
- step 6 Perform metal 3D printing on the STP solid model in step 5 that meets the requirements for use, heat treatment, and remove the printing support to obtain a semi-finished bridge with positioning support rods;
- the semi-finished bridge is fixed on the processing fixture, and the end surface and the inner taper hole of the interface of the implant site of the semi-finished dental bridge are processed accurately by the CNC machine, and then the positioning is removed Support rod, get customized porous dental bridge.
- the method for obtaining the oral environment model and the scanning rod model in step 1 includes an oral silicone inverted mold or wearing a mouth scan scanning rod.
- the positioning boss in step 2 is a regular hexagon, and the diameter of the through hole is 2 to 3 mm.
- the porous structure is a diamond cubic crystal structure;
- the filling method includes filling without shell and filling with shell; preferably, the thickness of the shell filled with shell is 0.5-0.8 mm.
- the STL digital model of the dental bridge described in step 4 undergoes correction processing before conversion and output.
- the surface of the processing fixture is provided with positioning holes corresponding to the number and positions of the positioning bosses, and the through holes of the positioning bosses are threadedly fixed with bolts.
- the present disclosure also provides a customized semi-finished porous dental bridge, including:
- positioning support rods formed by metal 3D printing, including positioning bosses and support rods.
- the outer contour of the positioning bosses is a regular polygon with a through hole passing through the surface and the bottom surface.
- the two ends of the support rods are respectively connected The dental bridge and the positioning boss.
- a customized porous dental bridge After the semi-finished customized porous dental bridge is cut by a CNC machine tool and the positioning support rod is removed, a customized porous dental bridge can be obtained.
- the use of metal 3D printing and CNC cutting to achieve the increase and decrease of material manufacturing of the dental bridge can add a porous structure in the additive preparation process, so that the dental bridge can meet the requirements of use strength while effectively reducing its elastic modulus;
- a positioning support rod as a transitional component is added during the additive preparation process. Through the cooperation of the positioning support rod and the machining fixture, the semi-finished dental bridge is clamped on the CNC machine tool to realize the high-precision processing of the dental bridge implant position interface.
- Figure 1 is a process flow diagram of a customized porous dental bridge manufacturing method based on adding and subtracting material processing methods
- Example 2 is a three-dimensional schematic diagram of the oral environment model and the scanning rod model described in step 1 in Example 1;
- FIG. 3 is a three-dimensional schematic diagram of the dental bridge STL digital model described in step 2 in Example 1;
- FIG. 4 is a three-dimensional schematic diagram of the STL digital model of the dental bridge after the porous treatment in step 3 in Example 1;
- Example 5 is a schematic diagram of the semi-finished dental bridge described in step 7 in Example 1 being fixed on a processing fixture.
- the customized porous bridge is manufactured.
- Step 1 Invert the patient’s mouth with a silicone mold, then scan to obtain the dental model and the scanning rod model, and finally obtain the interface data of the implant position through the digital matching of the scanning rod model; or obtain the oral digital model by wearing the mouth scan scanning rod, and then pass The scanning rod model is digitally matched to obtain the interface data of the implant position. as shown in picture 2.
- Step 2 Using the interface data obtained in step 1, use Magics software to design the dental bridge model, and then design unilateral and bilateral positioning support rods at the bridge shoulders that are separated by single teeth, as shown in Figure 3, to facilitate the teeth Subsequent finishing of the bridge.
- the rear end of the positioning support rod is provided with a regular hexagonal positioning boss, the width of the opposite side of the hexagonal boss is 4mm-6mm; the center of the boss is provided with a through hole with a diameter of 2mm-3mm.
- the hexagonal positioning boss of the dental bridge positioning support rod is matched with the regular hexagonal concave platform of the fixture, and then the screw is passed through the through hole of the hexagonal positioning boss of the positioning support rod to lock the bridge and the fixture. And fixed together.
- Step 3 Using the dental bridge STL model obtained in Step 2, fill the crown of the dental bridge model with no interface position on the upper part of the shoulder with the porous structure of diamond cubic crystals, the filling volume is 50% to 70%, and the pore size is 0.5mm to 1mm ;
- the filling method includes two ways of filling without shell and filling with shell.
- the thickness of the shell under the filling method with shell is 0.5 ⁇ 0.8mm. As shown in Figure 4.
- Step 4 Correct the STL model of the diamond porous bridge obtained in Step 3, specifically repairing the wrong triangular faces (such as triangular face overlap, gap, normal error, holes, etc.), and passing the STL model Simplify the mesh with multiple triangular faces, and then use Solidworks software to convert the SLT model and output it as a solid model in STP format;
- Step 5 Import the STP format model obtained in step 4 into ANSYS Workbench software for FEA analysis, simulate the porous bridge under the load of occlusal force (or the inner porous bridge with shell filling), and analyze the force and stress distribution , According to the results of simulation analysis, judge whether it is necessary to optimize the structure of the porous bridge. If necessary, return to step 3 to modify and optimize the filling volume, pore size and other parameters of the porous structure of the bridge;
- Step 6 Perform metal 3D printing on the porous dental bridge finalized in Step 5, and then perform heat treatment to eliminate defects in the bridge material and tissue, and finally remove the support left by the 3D printing;
- Step 7 In order to further ensure the high-precision cooperation between the dental bridge interface and the patient's implant position interface, the porous dental bridge printed in step 6 is fixed to a fixture designed to match it through positioning support rods, as shown in Figure 5. A CNC machine tool is used to finish machining the end face and inner cone of the interface. After finishing, the porous bridge interface can perfectly match the implant in the patient's mouth.
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Abstract
Description
本发明涉及医疗用品技术领域，特别涉及一种基于增减材加工方式的定制化多孔牙桥，以及制造该多孔牙桥的方法。The present invention relates to the technical field of medical supplies, and in particular to a customized porous dental bridge based on a processing method of adding and subtracting materials, and a method for manufacturing the porous dental bridge.
对于一些年龄较大且牙缺失比较严重，甚至是全口牙缺失的患者，可以通过植入较少的种植牙，然后将种植体与安装有全口活动义齿的牙桥连接在一起，使全口活动义齿获得更强的固位力和稳定性，来达到重建全口牙齿的目的，从而恢复咀嚼功能。这种先进的种植牙修复方式，可以减少种植牙的植入，降低种植牙修复的风险，为患者节省费用。For some older patients with severe tooth loss, or even complete tooth loss, it is possible to implant fewer dental implants, and then connect the implant to the bridge with the complete movable denture to make the complete Removable oral dentures obtain stronger retention and stability to achieve the purpose of reconstructing full-mouth teeth, thereby restoring chewing function. This advanced dental implant restoration method can reduce the implantation of dental implants, reduce the risk of dental implant restoration, and save costs for patients.
牙桥式修复是义齿修复技术的一种方式，它主要以缺牙间隙两端或一端的天然牙或种植体作为基牙，在基牙上制作义齿的固位体，并与人工牙连成一个整体，再通过粘固剂将义齿牙冠粘固于牙桥上，患者不能自行取下。该种修复方式能填补牙齿缺失的位置，防止邻近牙齿移位，避免牙齿不整齐及咬合不正常，还可恢复牙齿的咀嚼、发音和保持仪容。牙桥是一种具有美观效果的牙齿修复体，它具有坚硬、耐磨、抗压强度高等优点，可由金、合金、瓷或这些材料联合制作而成，所需的支持力由自然牙或种植体提供。Bridge restoration is a method of denture restoration technology. It mainly uses natural teeth or implants at the two ends or one end of the missing tooth gap as abutments. The retainers of the denture are made on the abutment and connected with the artificial teeth. As a whole, the denture crown is cemented on the bridge with cement, and the patient cannot remove it by himself. This kind of restoration method can fill the missing position of the tooth, prevent the displacement of adjacent teeth, avoid irregular teeth and abnormal occlusion, and restore the chewing, pronunciation and appearance of the teeth. Dental bridge is a kind of dental restoration with aesthetic effect. It has the advantages of hardness, wear resistance and high compressive strength. It can be made of gold, alloy, porcelain or a combination of these materials. The required supporting force is natural teeth or implants. Body provided.
传统牙桥的制作方式为蜡型铸造(增材)和切削加工成型(减材)，蜡型铸造方法非常依赖人工作业，通常需要3-7天完成，工序繁琐、耗时长，成品率低，容易影响种植牙的美观，甚至出现表面缺陷(如砂眼缩孔等)。切削加工的制造方式虽然很大程度上节省了时间和人工，且保证了牙桥形态尺寸的精确度，但只能加工外形和结构相对规则的牙桥，且成品牙桥较重，弹性模 量高，与骨组织相差较大，种植到口腔后患者牙槽骨所承受的压力较大，从而给病人造成不适感。The traditional methods of making dental bridges are wax casting (additive material) and cutting processing (subtractive material). The wax casting method relies heavily on manual operations and usually takes 3-7 days to complete. The process is cumbersome, time-consuming, and the yield is low. , Easily affect the aesthetics of dental implants, and even surface defects (such as trachoma shrinkage, etc.). Although the cutting manufacturing method greatly saves time and labor, and ensures the accuracy of the shape and size of the bridge, it can only process the bridge with a relatively regular shape and structure, and the finished bridge is heavier and has a modulus of elasticity. It is high, which is quite different from the bone tissue, and the pressure on the patient's alveolar bone after implantation in the oral cavity is greater, which will cause discomfort to the patient.
发明内容Summary of the invention
由于现有技术制作牙桥只有单纯通过增材或减材的加工方法制造成型，使得制成的牙桥可能存在该加工方法对应的缺陷。本发明的目的在于提供一种基于增减材加工方式的定制化多孔牙桥的制造方法，其通过金属3D打印与CNC切削加工实现牙桥的增、减材制造，解决现有技术制造牙桥所存在的缺陷。Since the dental bridge in the prior art can only be manufactured by a processing method of adding or subtracting materials, the manufactured dental bridge may have defects corresponding to the processing method. The purpose of the present invention is to provide a customized porous dental bridge manufacturing method based on the increase and decrease of material processing method, which realizes the increase and decrease of material manufacturing of the bridge through metal 3D printing and CNC cutting processing, and solves the problem of manufacturing bridges in the prior art. The flaws that exist.
一种基于增减材加工方式的定制化多孔牙桥的制造方法，包括如下步骤：A method for manufacturing a customized porous dental bridge based on a processing method of adding and subtracting materials includes the following steps:
1)获取口腔环境模型和扫描杆模型，通过扫描杆模型数字匹配获得种植位的接口数据；1) Obtain the oral environment model and the scanning rod model, and obtain the interface data of the implant position through the digital matching of the scanning rod model;
2)利用Magics软件制作牙桥STL数字模型：牙桥STL数字模型包括牙桥数字模型和若干定位支撑杆数字模型，导入接口数据确定所述牙桥数字模型，然后分别在间隔单颗牙的牙桥肩台处添加单边和/或双边定位支撑杆数字模型，所述定位支撑杆数字模型包括定位凸台和支撑杆，所述定位凸台的外轮廓呈正多边形，中间具有贯穿其表面和底面的通孔，所述支撑杆的两端分别连接牙桥数字模型和定位凸台；2) Use Magics software to make STL digital model of dental bridge: the digital model of dental bridge includes digital model of dental bridge and several digital models of positioning support rods. Import interface data to determine the digital model of dental bridge. A single-sided and/or bilateral positioning support rod digital model is added to the abutment. The positioning support rod digital model includes a positioning boss and a support rod. The outer contour of the positioning boss is a regular polygon with a surface and a bottom surface penetrating through the middle. The two ends of the support rod are respectively connected with the digital model of the dental bridge and the positioning boss;
3)对步骤2制得的牙桥STL数字模型进行多孔处理：对牙桥肩台上部无种植位的牙冠进行多孔结构填充，填充体积为50％～70％，孔径为0.5mm～1mm；3) Perform porous treatment on the dental bridge STL digital model prepared in step 2: Fill the crown without implant on the upper part of the bridge shoulder with porous structure, the filling volume is 50% to 70%, and the pore diameter is 0.5mm to 1mm;
4)利用Solidworks软件将步骤3所得的牙桥STL数字模型转换并输出为STP实体模型；4) Use the Solidworks software to convert the STL digital model of the dental bridge obtained in step 3 and output it as an STP solid model;
5)将STP实体模型导入ANSYS Workbench软件进行有限元分析，对加 载咬合力载荷下的STP实体模型进行受力以及应力分布情况的模拟分析，根据模拟分析结果是否符合使用要求，若不符合使用要求则返回到步骤3对牙桥STL数字模型的多孔结构的填充体积和/或孔径进行修正；5) Import the STP solid model into ANSYS Workbench software for finite element analysis, and perform a simulation analysis of the force and stress distribution of the STP solid model under the load of bite force. According to whether the simulation analysis result meets the requirements for use, if it does not meet the requirements for use Then return to step 3 to correct the filling volume and/or pore size of the porous structure of the bridge STL digital model;
6)将步骤5符合使用要求的STP实体模型进行金属3D打印成型，进行热处理，并去除打印支撑，得到带有定位支撑杆的牙桥半成品；6) Perform metal 3D printing on the STP solid model in step 5 that meets the requirements for use, heat treatment, and remove the printing support to obtain a semi-finished bridge with positioning support rods;
7)通过定位凸台与CNC机床加工夹具的固定连接，将牙桥半成品固定在加工夹具上，用CNC机床对牙桥半成品的种植位的接口的端面和内锥孔进行精度加工，然后去除定位支撑杆，得到定制化多孔牙桥。7) Through the fixed connection of the positioning boss and the CNC machine tool processing fixture, the semi-finished bridge is fixed on the processing fixture, and the end surface and the inner taper hole of the interface of the implant site of the semi-finished dental bridge are processed accurately by the CNC machine, and then the positioning is removed Support rod, get customized porous dental bridge.
其中，步骤1中获取口腔环境模型和扫描杆模型的方法包括口腔硅胶倒模或佩戴口扫扫描杆。步骤2所述定位凸台为正六边形，所述通孔直径为2～3mm。步骤3所述多孔结构为金刚石立方晶体结构；所述填充的方式包括无外壳填充和有外壳填充；优选地，所述有外壳填充的壳体厚度为0.5～0.8mm。步骤4所述牙桥STL数字模型在转换输出前经过修正处理。步骤7所述加工夹具表面设有与所述定位凸台数量、位置一一对应的定位孔，以螺栓穿过所述定位凸台的通孔与定位孔螺纹固定。Among them, the method for obtaining the oral environment model and the scanning rod model in step 1 includes an oral silicone inverted mold or wearing a mouth scan scanning rod. The positioning boss in step 2 is a regular hexagon, and the diameter of the through hole is 2 to 3 mm. In step 3, the porous structure is a diamond cubic crystal structure; the filling method includes filling without shell and filling with shell; preferably, the thickness of the shell filled with shell is 0.5-0.8 mm. The STL digital model of the dental bridge described in step 4 undergoes correction processing before conversion and output. In step 7, the surface of the processing fixture is provided with positioning holes corresponding to the number and positions of the positioning bosses, and the through holes of the positioning bosses are threadedly fixed with bolts.
本公开还提供了一种定制化多孔牙桥半成品，包括：The present disclosure also provides a customized semi-finished porous dental bridge, including:
金属3D打印成型的牙桥；及Metal 3D printed dental bridge; and
若干个金属3D打印成型的定位支撑杆，包括定位凸台和支撑杆，所述定位凸台的外轮廓呈正多边形，中间具有贯穿其表面和底面的通孔，所述支撑杆的两端分别连接所述牙桥和所述定位凸台。Several positioning support rods formed by metal 3D printing, including positioning bosses and support rods. The outer contour of the positioning bosses is a regular polygon with a through hole passing through the surface and the bottom surface. The two ends of the support rods are respectively connected The dental bridge and the positioning boss.
上述定制化多孔牙桥半成品经CNC机床切削加工后并去除定位支撑杆后即可得到一种定制化多孔牙桥。After the semi-finished customized porous dental bridge is cut by a CNC machine tool and the positioning support rod is removed, a customized porous dental bridge can be obtained.
与现有技术相比，本发明的有效有益效果如下：Compared with the prior art, the effective and beneficial effects of the present invention are as follows:
采用通过金属3D打印与CNC切削加工实现牙桥的增、减材制造，能够在增材制备过程中添加多孔结构，使得牙桥满足使用强度要求的同时也有效降低其弹性模量；同时还在增材制备过程中加设了作为过渡部件的定位支撑杆，通过定位支撑杆与加工夹具的配合，将牙桥半成品装夹在CNC机床上，从而实现牙桥种植位接口的高精度加工。The use of metal 3D printing and CNC cutting to achieve the increase and decrease of material manufacturing of the dental bridge can add a porous structure in the additive preparation process, so that the dental bridge can meet the requirements of use strength while effectively reducing its elastic modulus; A positioning support rod as a transitional component is added during the additive preparation process. Through the cooperation of the positioning support rod and the machining fixture, the semi-finished dental bridge is clamped on the CNC machine tool to realize the high-precision processing of the dental bridge implant position interface.
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单说明。显然，所描述的附图只是本发明的一部分实施例，而不是全部实施例，本领域的技术人员在不付出创造性劳动的前提下，还可以根据这些附图获得其他设计方案和附图。In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Obviously, the drawings described are only a part of the embodiments of the present invention, rather than all the embodiments. Those skilled in the art can also obtain other design schemes and drawings based on these drawings without creative work.
图1是基于增减材加工方式的定制化多孔牙桥的制造方法的工艺流程框图；Figure 1 is a process flow diagram of a customized porous dental bridge manufacturing method based on adding and subtracting material processing methods;
图2是实施例1中步骤1所述口腔环境模型和扫描杆模型立体示意图；2 is a three-dimensional schematic diagram of the oral environment model and the scanning rod model described in step 1 in Example 1;
图3是实施例1中步骤2所述牙桥STL数字模型立体示意图；3 is a three-dimensional schematic diagram of the dental bridge STL digital model described in step 2 in Example 1;
图4是实施例1中步骤3经多孔处理的牙桥STL数字模型立体示意图；4 is a three-dimensional schematic diagram of the STL digital model of the dental bridge after the porous treatment in step 3 in Example 1;
图5是实施例1中步骤7所述牙桥半成品固定在加工夹具上的示意图。5 is a schematic diagram of the semi-finished dental bridge described in step 7 in Example 1 being fixed on a processing fixture.
下面通过具体实施方式对本发明作进一步详细说明。但本领域技术人员将会理解，下列实施例仅用于说明本发明，而不应视为限定本发明的范围。所用试剂或仪器未注明生产厂商者，均为可以通过市购获得的常规产品。Hereinafter, the present invention will be further described in detail through specific embodiments. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. The reagents or instruments used without the manufacturer's indication are all conventional products that can be purchased on the market.
实施例1Example 1
按照如图1所示的工艺流程框图进行定制化多孔牙桥的制造。According to the process flow diagram shown in Figure 1, the customized porous bridge is manufactured.
步骤一：通过对患者口腔进行硅胶倒模，然后扫描得到牙模和扫描杆模 型，最后通过扫描杆模型数字匹配获得种植位的接口数据；或者通过佩戴口扫扫描杆获得口腔数字模型，然后通过扫描杆模型数字匹配获得种植位的接口数据。如图2所示。Step 1: Invert the patient’s mouth with a silicone mold, then scan to obtain the dental model and the scanning rod model, and finally obtain the interface data of the implant position through the digital matching of the scanning rod model; or obtain the oral digital model by wearing the mouth scan scanning rod, and then pass The scanning rod model is digitally matched to obtain the interface data of the implant position. as shown in picture 2.
步骤二：通过步骤一所获得的接口数据，利用Magics软件设计牙桥模型，然后分别在间隔单颗牙的牙桥肩台处设计单边和双边定位支撑杆，如图3所示，以便牙桥的后续精加工处理。定位支撑杆的尾端设有正六边形定位凸台，六边形凸台对边宽度为4mm～6mm；凸台中心设有直径为2mm～3mm的通孔。其中，牙桥定位支撑杆的六边形定位凸台与夹具的正六边形凹台配合在一起，然后用螺丝穿过定位支撑杆的六边形定位凸台通孔将牙桥和夹具锁紧并固定在一起。Step 2: Using the interface data obtained in step 1, use Magics software to design the dental bridge model, and then design unilateral and bilateral positioning support rods at the bridge shoulders that are separated by single teeth, as shown in Figure 3, to facilitate the teeth Subsequent finishing of the bridge. The rear end of the positioning support rod is provided with a regular hexagonal positioning boss, the width of the opposite side of the hexagonal boss is 4mm-6mm; the center of the boss is provided with a through hole with a diameter of 2mm-3mm. Among them, the hexagonal positioning boss of the dental bridge positioning support rod is matched with the regular hexagonal concave platform of the fixture, and then the screw is passed through the through hole of the hexagonal positioning boss of the positioning support rod to lock the bridge and the fixture. And fixed together.
步骤三：通过步骤二得到的牙桥STL模型，对牙桥模型肩台上部无接口位的牙冠进行金刚石立方晶体的多孔结构填充，填充体积为50％～70％，孔径为0.5mm～1mm；填充方式包含无外壳填充和有外壳填充两种方式，有外壳填充方式下的壳体厚度为0.5～0.8mm。如图4所示。Step 3: Using the dental bridge STL model obtained in Step 2, fill the crown of the dental bridge model with no interface position on the upper part of the shoulder with the porous structure of diamond cubic crystals, the filling volume is 50% to 70%, and the pore size is 0.5mm to 1mm ; The filling method includes two ways of filling without shell and filling with shell. The thickness of the shell under the filling method with shell is 0.5～0.8mm. As shown in Figure 4.
步骤四：将步骤三得到的金刚石多孔牙桥的STL模型进行修正处理，具体是针对有错误的三角面(比如三角面重叠、间隙、法向错误、孔洞等)进行修复，以及将STL模型过多的三角面进行网格简化，然后利用Solidworks软件将SLT模型转换并输出为STP格式的实体模型；Step 4: Correct the STL model of the diamond porous bridge obtained in Step 3, specifically repairing the wrong triangular faces (such as triangular face overlap, gap, normal error, holes, etc.), and passing the STL model Simplify the mesh with multiple triangular faces, and then use Solidworks software to convert the SLT model and output it as a solid model in STP format;
步骤五：将步骤四得到的STP格式模型导入ANSYS Workbench软件进行FEA分析，对加载咬合力载荷下的多孔牙桥(或有外壳填充内部多孔牙桥)进行模拟，分析其受力以及应力分布情况，根据模拟分析结果判断是否需要对多孔牙桥进行结构优化，若需要，再返回到步骤三对牙桥多孔结构的填充体积、孔径等参数进行修改和优化；Step 5: Import the STP format model obtained in step 4 into ANSYS Workbench software for FEA analysis, simulate the porous bridge under the load of occlusal force (or the inner porous bridge with shell filling), and analyze the force and stress distribution , According to the results of simulation analysis, judge whether it is necessary to optimize the structure of the porous bridge. If necessary, return to step 3 to modify and optimize the filling volume, pore size and other parameters of the porous structure of the bridge;
步骤六：将步骤五最终定型后的多孔牙桥进行金属3D打印成型，然后进行热处理消除牙桥材料和组织上的缺陷，最后去除3D打印所遗留的支撑；Step 6: Perform metal 3D printing on the porous dental bridge finalized in Step 5, and then perform heat treatment to eliminate defects in the bridge material and tissue, and finally remove the support left by the 3D printing;
步骤七：为了进一步保证牙桥接口和患者种植位接口高精度配合，将步骤六打印好的多孔牙桥通过定位支撑杆固定在与之匹配设计好的夹具上，如图5所示。利用CNC机床对接口的端面和内锥孔进行精加工，经过精加工后的多孔牙桥接口可与患者口腔中的种植体完美匹配。Step 7: In order to further ensure the high-precision cooperation between the dental bridge interface and the patient's implant position interface, the porous dental bridge printed in step 6 is fixed to a fixture designed to match it through positioning support rods, as shown in Figure 5. A CNC machine tool is used to finish machining the end face and inner cone of the interface. After finishing, the porous bridge interface can perfectly match the implant in the patient's mouth.
以上的实施例仅仅是对本发明的优选实施方式进行描述，并非对本发明的范围进行限定，本发明的技术构思范围内，可以对本发明的技术方案进行多种简单的变型，均应落入本发明的权利要求书确定的保护范围内。The above examples only describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Within the scope of the technical concept of the present invention, many simple modifications can be made to the technical solution of the present invention, which should all fall into the present invention. Within the scope of protection determined by the claims.
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