技术领域technical field
本发明涉及一种从牙颌三维模型分割单颗牙冠的计算机交互式方法。The invention relates to a computer-interactive method for segmenting a single crown from a three-dimensional model of a jaw.
背景技术Background technique
随着3D采集技术的发展，牙颌三维模型目前被广泛应用于牙科相关领域，如口腔医学、法医学、人类学及考古学等。对于牙颌模型进行分割、归类等处理是治疗计划制定、虚拟手术等牙科虚拟现实应用中不可或缺的部分。With the development of 3D acquisition technology, 3D models of teeth and jaws are currently widely used in related fields of dentistry, such as stomatology, forensic science, anthropology and archaeology. Segmentation and classification of dental models are an indispensable part of dental virtual reality applications such as treatment planning and virtual surgery.
目前针对牙冠的网格自动分割方法很难得到准确的模型，鲁棒性不强。交互式分割方法虽然可以利用人的先验知识，充分体现用户的操作意图，但目前的方法一般都需要用户沿着预想的牙冠分割线指定若干个边界点，这种繁琐、耗时的工序显然不符合智能化的标识。以往的方法要么需要大量手工交互来确定边界，耗时费力，要么得不到准确的牙冠分割结果、鲁棒性差。因此，要准确且智能化的从包含复杂牙冠边缘信息的牙颌网格模型中准确分离出所有的牙冠模型是一件具有挑战性的课题。The current automatic mesh segmentation method for the crown is difficult to obtain an accurate model, and its robustness is not strong. Although the interactive segmentation method can use human prior knowledge to fully reflect the user's operation intention, the current method generally requires the user to specify several boundary points along the expected crown segmentation line, which is a cumbersome and time-consuming process. Obviously does not meet the intelligent logo. The previous methods either required a lot of manual interaction to determine the boundary, which was time-consuming and laborious, or could not obtain accurate crown segmentation results and had poor robustness. Therefore, it is a challenging task to accurately and intelligently separate all the crown models from the jaw mesh model containing complex crown edge information.
发明内容Contents of the invention
本发明所要解决的技术问题是，针对上述现有技术的不足，提供一种从牙颌三维模型分割单颗牙冠的计算机交互式方法。The technical problem to be solved by the present invention is to provide a computer interactive method for segmenting a single dental crown from a three-dimensional model of a tooth and jaw in view of the above-mentioned deficiencies in the prior art.
为解决上述技术问题，本发明所采用的技术方案是：一种从牙颌三维模型分割单颗牙冠的计算机交互式方法，包括以下步骤：In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a computer interactive method for segmenting a single crown from a three-dimensional model of the jaw, comprising the following steps:
1)读入并可视化显示牙颌三维网格模型；1) Read in and visualize the 3D mesh model of the jaw;
2)检测所述牙颌三维网格模型中牙颌上牙齿的解剖学特征点及咬合平面；2) detecting the anatomical feature points and the occlusal plane of the teeth on the jaw in the three-dimensional mesh model of the jaw;
3)指定牙颌三维网格模型调和场的约束点；3) Designate the constraint points of the harmonic field of the three-dimensional mesh model of the tooth and jaw;
4)根据约束点计算调和场，获取牙冠分割边界线；4) Calculate the harmonic field according to the constraint points, and obtain the crown segmentation boundary line;
5)依照获取的牙冠分割边界线进行网格切割，得到牙冠模型。5) Carry out mesh cutting according to the obtained crown segmentation boundary line to obtain the crown model.
所述步骤2)中，利用所述牙颌三维网格模型上顶点的曲率信息及分水岭方法获取牙颌上牙齿的解剖学特征点，利用所述解剖学特征点确定咬合平面。In the step 2), the curvature information of vertices on the three-dimensional mesh model of the jaw and the watershed method are used to obtain the anatomical feature points of the teeth on the jaw, and the occlusal plane is determined by using the anatomical feature points.
所述步骤3)中，为目标牙冠分别指定1个位于近中牙缝处和1个位于远中牙缝处的约束点。In the step 3), one constraint point located at the mesial interdental space and one at the distal interdental space are respectively designated for the target crown.
所述步骤4)中，调和场的计算过程为：设牙颌三维网格模型中有m个节点，n个约束点，求解AΦ＝b，得到的解即为牙颌三维网格模型各个顶点对应的调和场值；其中，
所述步骤4)中，获取牙冠分割边界线的过程为：从所述调和场中抽取若干条等值线作为候选边界线集合，选取评分最高的一条候选边界环作为牙冠牙冠分割边界线。In the step 4), the process of obtaining the crown segmentation boundary line is: extracting several isolines from the harmonic field as a set of candidate boundary lines, and selecting a candidate boundary ring with the highest score as the crown crown segmentation boundary Wire.
所述n个约束点包括所述步骤2)获得的解剖学特诊点、步骤3)指定的两个约束点和一系列围绕且不属于目标牙冠的约束点B；所述约束点B的确定方法如下：找到所有解剖学特征点在所述咬合平面上的投影点，找到位于所述咬合平面上、且经过所述投影点的直线；以咬合平面的法线为轨迹，将所述直线朝牙颌底部平移一段距离，所述距离设定为从牙冠尖点到牙颌底部垂直距离的2/3倍；获取直线与牙颌模型的交点，所述交点的集合即为B。The n constraint points include the anatomical special diagnosis points obtained in step 2), the two constraint points specified in step 3) and a series of constraint points B surrounding and not belonging to the target crown; the constraint points B The determination method is as follows: find the projection points of all anatomical feature points on the occlusal plane, find a straight line that is located on the occlusal plane and passes through the projection points; A certain distance is translated toward the bottom of the jaw, and the distance is set as 2/3 times the vertical distance from the cusp point of the crown to the bottom of the jaw; the intersection point of the straight line and the jaw model is obtained, and the set of intersection points is B.
所述步骤4)中，获取所述牙冠分割边界线后，优化所述牙冠分割边界线，优化过程如下：为牙冠分割边界线上各点计算一个标量场，每个点对应的标量值为该点的单位法向量与B中近舌侧点的平均单位法向量的点积，由点积的概念可知，该标量场的值域为[-1,1]；选取大于0的阈值对该标量场进行阈值化，将所述牙冠分割边界线分为近唇侧和近舌侧两部分，舍弃近舌侧部分，保留近唇侧边界线部分；然后，在贴近牙颌近舌侧表面的平面上构造样条线，所述平面由所保留的近唇侧边界线的2个端点以及B中近舌侧的1点确定，将该样条线作为新的近舌侧牙冠边界线；最后，将所述近唇侧边界线部分边界线和所述新的近舌侧牙冠边界线结合起来，成为优化后的完整的牙冠分割边界线。In the step 4), after the crown segmentation boundary line is obtained, the crown segmentation boundary line is optimized, and the optimization process is as follows: a scalar field is calculated for each point on the crown segmentation boundary line, and the scalar field corresponding to each point The magnitude value is the dot product of the unit normal vector of this point and the average unit normal vector of the near-lingual point in B. According to the concept of dot product, the value range of this scalar field is [-1,1]; Threshold thresholding the scalar field, dividing the boundary line of the crown segmentation into two parts near the labial side and near the lingual side, discarding the part near the lingual side, and keeping the part near the lip side; Construct a spline on the plane of the lingual surface defined by the 2 endpoints of the retained proximal labial boundary line and 1 point on the lingual side in B, and use this spline as the new proximal lingual tooth crown boundary line; finally, the partial boundary line of the near-labial boundary line and the new near-lingual tooth crown boundary line are combined to become an optimized complete crown division boundary line.
与现有技术相比，本发明所具有的有益效果为：本发明只需少量的用户交互，就能获取具有准确边界信息的牙冠模型，鲁棒性好，节省时间，操作简单，实现方便；使用本发明公开的方法，可以准确得到牙齿分割边界，且使用简单：对于欲分离的单颗牙齿,一般只需用户在牙颌模型的可视化视图上交互式的确定2个边界点，就能准确得到该牙齿的牙冠网格模型。本发明对于牙齿正畸，牙颌虚拟手术模拟等有着重要的意义。Compared with the prior art, the present invention has the beneficial effects that: the present invention only requires a small amount of user interaction to obtain a crown model with accurate boundary information, has good robustness, saves time, is simple to operate, and is convenient to implement ;Using the method disclosed in the present invention, the tooth segmentation boundary can be accurately obtained, and it is easy to use: for a single tooth to be separated, generally the user only needs to interactively determine two boundary points on the visual view of the dental model, and then the Accurately obtain the crown mesh model of the tooth. The invention has important significance for dental orthodontics, dental jaw virtual surgery simulation and the like.
附图说明Description of drawings
图1为本发明从上颌网格模型分离牙冠的流程图；Fig. 1 is the flowchart of separating the crown from the maxillary mesh model of the present invention;
图2为本发明所使用的牙颌上各牙齿的解剖学特征点示意图；Fig. 2 is a schematic diagram of the anatomical feature points of each tooth on the jaw used in the present invention;
图3为计算调和场所需约束点的示意图；Fig. 3 is a schematic diagram of the constraint points required for calculating the harmonic field;
图4为计算所得调和场结果及其等值线的示意图；Figure 4 is a schematic diagram of the calculated harmonic field result and its contour;
图5A为需要优化的牙冠分割边界线示意图；Fig. 5A is a schematic diagram of the boundary line of the crown segmentation that needs to be optimized;
图5B为分离后所保留的近唇侧边界线及构造近舌侧边界线所依赖平面的示意图；Fig. 5B is a schematic diagram of the retained near-labial boundary line after separation and the plane on which the construction of the near-lingual boundary line depends;
图5C为优化后的牙冠分割边界线的示意图，其中包括了新构造的近舌侧边界线；Fig. 5C is a schematic diagram of the optimized crown segmentation boundary line, which includes the newly constructed near-lingual boundary line;
图5D为依照牙冠分割边界线进行网格切割，最终分离出单颗牙冠的结果。Fig. 5D is the result of mesh cutting according to the boundary line of the crown segmentation, and finally separating a single crown.
具体实施方式Detailed ways
本发明的具体实施方式详述如下：The specific embodiment of the present invention is described in detail as follows:
如图1所示，本发明所述的从上颌网格模型上交互式分离牙冠的方法，包括步骤：1读入并可视化显示牙颌三维网格模型；2自动检测牙颌上牙齿的解剖学特征点及咬合平面；3由用户指定网格模型调和场的约束点；4根据约束点计算调和场，获取牙冠分割边界线；5如有必要，优化该边界线；6依照获取的边界线进行网格切割，得到牙冠模型。As shown in Figure 1, the method for interactively separating the crown from the maxillary mesh model of the present invention includes the steps of: 1 reading in and visually displaying the three-dimensional mesh model of the jaw; 2 automatic detection of the anatomy of the teeth on the jaw 3. The user specifies the constraint points of the harmonic field of the grid model; 4. Calculate the harmonic field according to the constraint points to obtain the boundary line of the crown segmentation; 5. If necessary, optimize the boundary line; 6. According to the obtained boundary Line mesh cutting to get the crown model.
1.读入并可视化显示牙颌三维网格模型1. Read in and visualize the 3D mesh model of the jaw
从模型文件中载入牙颌通用网格模型数据，该网格模型可以通过三维采集设备(如扫描仪)得到，亦可从CBCT等医学序列图片中重建获得。在计算机中通过通用计算机图形学可视化平台(例如OpenGL)可视化显示以后，用户可以使用鼠标、键盘等设备对该模型进行交互式操作(例如缩放、旋转、平移、选点等)。Load the general mesh model data of teeth and jaws from the model file. The mesh model can be obtained through a three-dimensional acquisition device (such as a scanner), or reconstructed from medical sequence pictures such as CBCT. After being visualized on the computer through a general computer graphics visualization platform (such as OpenGL), users can use the mouse, keyboard and other devices to perform interactive operations on the model (such as zooming, rotating, translating, selecting points, etc.).
2.自动检测上颌牙齿的解剖学特征点及牙颌平面2. Automatic detection of anatomical feature points and maxillary planes of maxillary teeth
利用网格模型上顶点的曲率信息及相关算法(例如分水岭算法)，可以顺利得到牙冠上的解剖学特征点信息。例如图2A所示的切牙切嵴上的2个端点、图2B所示的尖牙上的1个尖点(牙尖)、图2C所示的前磨牙上的2个尖点(舌尖、颊尖)以及图2D所示的磨牙上的4个尖点(远中颊尖、远中舌尖、近中舌尖、近中颊尖)。Using the curvature information of the vertices on the mesh model and related algorithms (such as the watershed algorithm), the anatomical feature point information on the crown can be obtained smoothly. For example, 2 endpoints on the incisor ridge shown in Figure 2A, 1 cusp (cusp) on the canine shown in Figure 2B, and 2 cusps (tongue tip, cusp) on the premolar shown in Figure 2C. Buccal tip) and the 4 cusps on the molars shown in Figure 2D (distal buccal tip, distal lingual tip, mesial lingual tip, mesial buccal tip).
确定好特征点之后，咬合平面也就可以随之确定下来。本发明采用通用的定义，即两颗切牙的邻接点、左侧第一磨牙的近中舌尖以及右侧第一磨牙的近中舌尖共三点来确定该咬合平面。After the feature points are determined, the occlusal plane can be determined accordingly. The present invention adopts a general definition, that is, the adjacent points of the two incisors, the mesiolingual tip of the left first molar, and the mesiolingual tip of the right first molar are three points to determine the occlusal plane.
3.用户指定网格模型调和场的约束点3. The user specifies the constraint points of the harmonic field of the grid model
在本发明所设计的交互式环境下，用户可以使用鼠标、键盘自由选取(通过旋转、平移、缩放)合适的牙颌模型的可视化视图，并在选定的视图中任意选取网格模型上的顶点并获取其坐标。本发明中，需要用户为目标牙冠指定2个分别位于近中和远中牙缝处的约束点。图3所示的牙齿为某下颌左侧第一前磨牙的可视化视图，其中的①标识的小球展示了符合本发明要求的用户指定约束点。Under the interactive environment designed by the present invention, the user can use the mouse and the keyboard to freely select (by rotating, translating, zooming) the visual view of the suitable dental model, and arbitrarily select the visual view on the grid model in the selected view. vertex and get its coordinates. In the present invention, the user is required to designate two constraint points respectively located at the mesial and distal interdental spaces for the target crown. The tooth shown in Fig. 3 is a visualized view of the first premolar on the left side of the mandible, and the ball marked by ① shows the user-specified constraint point meeting the requirements of the present invention.
4.根据约束点计算调和场，获取牙冠分割边界线4. Calculate the harmonic field according to the constraint points, and obtain the boundary line of the crown segmentation
本发明中，我们将寻找分割边界线问题转化为计算网格表面的调和场并选取其某条等值线问题进行解决。In the present invention, we transform the problem of finding the segmentation boundary line into the problem of calculating the harmonic field of the grid surface and selecting one of its isovalues to solve.
求解网格表面调和场在数学上即求解泊松方程△Φ＝0(△代表离散拉普拉斯算子)。使用最小二乘法可以求解该泊松方程，此时原方程转化为AΦ＝b的形式，Solving the harmonic field of the grid surface means solving the Poisson equation △Φ=0 (△ represents the discrete Laplacian operator) in mathematics. The Poisson equation can be solved by using the least square method, and the original equation is transformed into the form of AΦ=b at this time,
其中L是拉普拉斯矩阵，如果网格中有m个节点，则L是m×m阶矩阵，对于0≤i,j≤m-1，Where L is a Laplacian matrix. If there are m nodes in the grid, then L is a matrix of order m×m. For 0≤i, j≤m-1,
其中，E为牙颌三维网格模型中边的集合；ω是拉普拉斯算子的权值，对于调和场的分布有着重要的影响。这里我们采用Among them, E is the set of edges in the three-dimensional mesh model of the jaw; ω is the weight of the Laplacian operator, which has an important influence on the distribution of the harmonic field. Here we use
如果vi或vj处为凹点 If vi or vj is a concave point
来捕捉代表分割边界地网格表面凹陷区域，其中vi为在i点处的坐标值，代表平均的边长度，Θ为一个很小的常量(例如0.001)。To capture the concave region of the grid surface representing the segmentation boundary, where vi is the coordinate value at point i, Represents the average side length, Θ is a small constant (eg 0.001).
C和b'分别是代表调和场中约束条件的矩阵和向量。如果m个节点的网格上有n个约束点，则C和b'可以表示如下：C and b' are respectively a matrix and a vector representing the constraints in the harmonic field. If there are n constraint points on a grid of m nodes, C and b' can be expressed as follows:
w是一个很大的系数，这里取值为1000。对于第i(i＝0,1,…n-1)个约束点，其在网格中的序号为p(0≤p≤m-1),则C中的元素cip＝1，其余为0。b'中元素bi的取值∈{0,0.5,1}，即bi的取值为0、0.5、或1，对应于第i个约束点的取值。利用求解带有大型稀疏系数矩阵线性方程AΦ＝b的工具包求出方程的解，即为每个顶点对应的调和场值。w is a large coefficient, the value here is 1000. For the i(i=0,1,...n-1) constraint point, its serial number in the grid is p(0≤p≤m-1), then the element cip =1 in C, and the rest are 0. The value of element bi in b' ∈ {0,0.5,1}, that is, the value of bi is 0, 0.5, or 1, corresponding to the value of the i-th constraint point. Use the toolkit for solving the linear equation AΦ=b with a large sparse coefficient matrix to find the solution of the equation, which is the value of the harmonic field corresponding to each vertex.
为了利用调和场分离牙冠，除了用户指定的2个约束点(记为U，其对应的bi值为0.5)以外，其余的约束点可由系统自动获取。他们分别为步骤2中确定的牙冠上的特征点(记为F，对应的bi值为1)，以及一系列围绕且不属于目标牙冠的约束点(记为B，对应的bi值为0)。以图3为例，其中的②和③所标识的小球分别代表了F和B。In order to use the harmonic field to separate the crown, except for the two constraint points specified by the user (denoted as U, whose corresponding bi value is 0.5), the rest of the constraint points can be automatically obtained by the system. They are the feature points on the crown determined in step 2 (denoted as F, and the corresponding bi value is 1), and a series of constraint points surrounding and not belonging to the target crown (denoted as B, corresponding to bi value is 0). Take Figure 3 as an example, where the balls marked by ② and ③ represent F and B respectively.
我们采用如下的方法确定B：B中的点由一系列直线与牙颌网格模型的交集所确定。这些直线初始化的时候分别经过F中各点在咬合平面上的投影点，且位于咬合平面上。然后，我们沿着咬合平面的法线作为轨迹，将他们分别朝牙颌底部平移一段距离。这段距离长度我们一般设定为从牙冠尖点到牙颌底部垂直距离的2/3倍。We use the following method to determine B: the points in B are determined by the intersection of a series of straight lines and the jaw mesh model. When these lines are initialized, they respectively pass through the projection points of each point in F on the occlusal plane, and are located on the occlusal plane. Then, we translate each of them a certain distance towards the bottom of the jaw along the normal of the occlusal plane as a trajectory. We generally set this distance to 2/3 times the vertical distance from the cusp of the crown to the bottom of the jaw.
为调和场指定约束条件以后即可求解线性方程AΦ＝b，得到网格上每个节点对应的调和场标量值。我们使用从该调和场中抽取的若干条等值线作为候选边界线集合。图4展示了某颗目标牙冠在给定约束条件下的调和场及其等值线。最后，我们采用评分的方式选取候选边界线中最好的一条边界环作为牙冠的分割边界。After specifying constraints for the harmonic field, the linear equation AΦ=b can be solved to obtain the scalar value of the harmonic field corresponding to each node on the grid. We use several isolines extracted from the harmonic field as a set of candidate boundary lines. Figure 4 shows the harmonic field and its isolines of a target crown under given constraints. Finally, we use scoring to select the best boundary ring among the candidate boundary lines as the segmentation boundary of the crown.
5.如有必要，优化4中所得的边界5. If necessary, optimize the bounds obtained in 4
如果目标牙冠近舌侧边界不明显(如图5所示)，则需要对4中所述的边界线进行必要的优化。首先，我们为边界线上各点计算一个标量场，。在所述标量场中，每个点对应的标量值为该点的单位法向量与B中近舌侧点的平均单位法向量的点积，由点积的概念可知，该标量场的值域为[-1,1]；选取大于0的某阈值对该标量场进行阈值化，便可将边界线分为近唇侧和近舌侧两部分，我们弃近舌侧部分，保留其余近唇侧的边界线部分(例如图5B相对于图5A来说，其所保留的曲线部分)。然后，我们在贴近牙颌近舌侧表面的特定平面上构造样条线(例如图5C相对于图5B来说，其所添加的曲线部分)，将该样条线作为新的近舌侧牙冠边界线。该平面由所保留的近唇侧边界线的2个端点以及B中近舌侧的1点唯一的确定(例如图5B相对于图5A来说，其所添加的平面)。最后，将前2步得到的两侧(即近舌侧和近唇侧)边界线结合起来，成为优化后的完整的牙冠分割边界线。If the near-lingual boundary of the target crown is not obvious (as shown in Figure 5), the boundary line described in 4 needs to be optimized as necessary. First, we compute a scalar field, , for each point on the boundary line. In the scalar field, the scalar value corresponding to each point is the dot product of the unit normal vector of the point and the average unit normal vector of the near-lingual point in B. From the concept of dot product, the value of the scalar field The field is [-1,1]; select a threshold greater than 0 to threshold the scalar field, and then divide the boundary line into two parts near the lip and near the tongue. We discard the part near the tongue and keep the rest The part of the border line on the labial side (for example, the part of the curve that is retained in Fig. 5B relative to Fig. 5A). Then, we construct a spline on a specific plane close to the lingual surface of the dentition (such as the added curve part in Figure 5C compared to Figure 5B), and use this spline as the new lingual tooth crown border. This plane is uniquely determined by the two end points of the retained near-labial boundary line and one point on the near-lingual side in B (for example, the plane added in Fig. 5B relative to Fig. 5A). Finally, the boundary lines on both sides (namely near lingual side and near labial side) obtained in the first two steps are combined to become the optimized complete crown segmentation boundary line.
6.依照获取的边界线进行网格切割，得到牙冠模型6. Carry out mesh cutting according to the obtained boundary line to obtain the crown model
得到满意的牙冠分割边界线以后,我们使用网格切割的方法将目标牙冠从牙颌上分离下来。具体方法是计算边界线上的各点到邻近的网格顶点的距离。利用该局部距离场，即便分割边界线不能完全贴合于牙颌网格表面上(例如新构造的近舌侧样条边界线)，网格切割也能够顺利的进行。图5D显示了根据边界线切割后的牙冠模型。After obtaining the satisfactory boundary line of the crown segmentation, we use the mesh cutting method to separate the target crown from the jaw. The specific method is to calculate the distance from each point on the boundary line to the adjacent mesh vertices. Using this local distance field, even if the segmentation boundary line cannot completely fit on the dental mesh surface (such as the newly constructed near-lingual spline boundary line), the mesh cutting can proceed smoothly. Figure 5D shows the crown model cut according to the boundary line.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410680473.0ACN104392492A (en) | 2014-11-24 | 2014-11-24 | Computer interaction type method for segmenting single tooth crown from three-dimensional jaw model |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410680473.0ACN104392492A (en) | 2014-11-24 | 2014-11-24 | Computer interaction type method for segmenting single tooth crown from three-dimensional jaw model |
| Publication Number | Publication Date |
|---|---|
| CN104392492Atrue CN104392492A (en) | 2015-03-04 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410680473.0APendingCN104392492A (en) | 2014-11-24 | 2014-11-24 | Computer interaction type method for segmenting single tooth crown from three-dimensional jaw model |
| Country | Link |
|---|---|
| CN (1) | CN104392492A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104867131A (en)* | 2015-04-24 | 2015-08-26 | 杭州一牙数字口腔有限公司 | Dental crown data extraction method based on digital model |
| CN105046750A (en)* | 2015-08-24 | 2015-11-11 | 杭州美齐科技有限公司 | Method for automatically segmenting whole dental triangular mesh model |
| CN105748163A (en)* | 2016-02-05 | 2016-07-13 | 杭州美齐科技有限公司 | Design method for computer-aided bracket-free concealed teeth correcting equipment |
| CN105931291A (en)* | 2016-05-16 | 2016-09-07 | 杭州美齐科技有限公司 | Digitalized complete tooth and jaw modeling method |
| CN106228550A (en)* | 2016-07-19 | 2016-12-14 | 上海爱圣美科技有限公司 | A kind of recognition methods of three-dimensional tooth model dens in dente crown moieties |
| CN106228549A (en)* | 2016-07-14 | 2016-12-14 | 嘉兴学院 | A kind of triangle gridding tooth dividing method based on path planning |
| CN106228616A (en)* | 2016-07-19 | 2016-12-14 | 上海爱圣美科技有限公司 | A kind of method repairing corona proximal surface in three-dimensional tooth model |
| CN107622529A (en)* | 2016-07-15 | 2018-01-23 | 佛山市诺威科技有限公司 | Three-dimensional tooth model automatic segmentation method based on morphology |
| CN108242056A (en)* | 2018-02-06 | 2018-07-03 | 北京朗视仪器有限公司 | A kind of dividing method of the three dimensional tooth mesh data based on reconciliation field algorithm |
| CN109146867A (en)* | 2018-08-24 | 2019-01-04 | 四川木牛流马智能科技有限公司 | Oral cavity curved surface CT image biological feature extraction and matching process and equipment |
| CN109598703A (en)* | 2018-11-19 | 2019-04-09 | 影为医疗科技(上海)有限公司 | Processing method, system, computer readable storage medium and the equipment of dental imaging |
| CN109993751A (en)* | 2019-03-11 | 2019-07-09 | 常熟理工学院 | Semi-automatic and accurate segmentation algorithm of teeth and jaws based on sag-aware harmonic scalar field |
| CN115619773A (en)* | 2022-11-21 | 2023-01-17 | 山东大学 | A method and system for three-dimensional tooth multimodal data registration |
| CN117455934A (en)* | 2023-12-22 | 2024-01-26 | 中南大学 | An enhanced segmentation method for abnormal lesion areas in oral CT |
| CN118866251A (en)* | 2024-07-08 | 2024-10-29 | 梅州市人民医院(梅州市医学科学院) | Plastic surgery plan generation method, device and storage medium based on medical images |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6049743A (en)* | 1996-09-06 | 2000-04-11 | Technology Research Association Of Medical And Welfare Appartus | Method of designing dental prosthesis model and computer program product therefor |
| CN103700103A (en)* | 2013-12-05 | 2014-04-02 | 嘉兴学院 | Method for automatically extracting gingiva curves of three-dimensional digital dentition model |
| CN103871097A (en)* | 2014-02-26 | 2014-06-18 | 南京航空航天大学 | Tooth preparation-based data flexible fusion method |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6049743A (en)* | 1996-09-06 | 2000-04-11 | Technology Research Association Of Medical And Welfare Appartus | Method of designing dental prosthesis model and computer program product therefor |
| CN103700103A (en)* | 2013-12-05 | 2014-04-02 | 嘉兴学院 | Method for automatically extracting gingiva curves of three-dimensional digital dentition model |
| CN103871097A (en)* | 2014-02-26 | 2014-06-18 | 南京航空航天大学 | Tooth preparation-based data flexible fusion method |
| Title |
|---|
| BEI-JI ZOU 等: "Interactive tooth partition of dental mesh base on tooth-target harmonic field", 《WWW.SCIENCEDIRECT.COM/SCIENCE/ARTICLE/PII/S001048251400287X》* |
| HAO WANG 等: "Spectral 3D mesh segmentation with a novel single segmentation field", 《GRAPHICAL MODELS》* |
| OSCAR KIN-CHUNG AU 等: "Mesh Segmentation with Concavity-Aware Fields", 《IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS》* |
| 朱赴东 等: "数字化全牙列下颌骨三维解剖建模", 《解剖学报》* |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104867131A (en)* | 2015-04-24 | 2015-08-26 | 杭州一牙数字口腔有限公司 | Dental crown data extraction method based on digital model |
| CN104867131B (en)* | 2015-04-24 | 2017-11-03 | 杭州一牙数字口腔有限公司 | Corona data extraction method based on digital model |
| CN105046750A (en)* | 2015-08-24 | 2015-11-11 | 杭州美齐科技有限公司 | Method for automatically segmenting whole dental triangular mesh model |
| CN105046750B (en)* | 2015-08-24 | 2017-08-15 | 杭州美齐科技有限公司 | A kind of method of the full jaw tooth triangle grid model of automatic segmentation |
| CN105748163A (en)* | 2016-02-05 | 2016-07-13 | 杭州美齐科技有限公司 | Design method for computer-aided bracket-free concealed teeth correcting equipment |
| CN105931291A (en)* | 2016-05-16 | 2016-09-07 | 杭州美齐科技有限公司 | Digitalized complete tooth and jaw modeling method |
| CN105931291B (en)* | 2016-05-16 | 2018-10-12 | 杭州美齐科技有限公司 | A kind of complete dental modeling method of digitlization |
| CN106228549B (en)* | 2016-07-14 | 2019-04-19 | 嘉兴学院 | A triangular mesh tooth segmentation method based on path planning |
| CN106228549A (en)* | 2016-07-14 | 2016-12-14 | 嘉兴学院 | A kind of triangle gridding tooth dividing method based on path planning |
| CN107622529A (en)* | 2016-07-15 | 2018-01-23 | 佛山市诺威科技有限公司 | Three-dimensional tooth model automatic segmentation method based on morphology |
| CN106228616A (en)* | 2016-07-19 | 2016-12-14 | 上海爱圣美科技有限公司 | A kind of method repairing corona proximal surface in three-dimensional tooth model |
| CN106228550A (en)* | 2016-07-19 | 2016-12-14 | 上海爱圣美科技有限公司 | A kind of recognition methods of three-dimensional tooth model dens in dente crown moieties |
| CN106228550B (en)* | 2016-07-19 | 2019-04-30 | 上海爱圣美科技有限公司 | A method for identifying the crown part in a three-dimensional tooth model |
| CN106228616B (en)* | 2016-07-19 | 2019-04-30 | 上海爱圣美科技有限公司 | A method for repairing abutting surfaces of dental crowns in a three-dimensional tooth model |
| CN108242056B (en)* | 2018-02-06 | 2020-04-28 | 北京朗视仪器有限公司 | Three-dimensional tooth grid data segmentation method based on harmonic field algorithm |
| CN108242056A (en)* | 2018-02-06 | 2018-07-03 | 北京朗视仪器有限公司 | A kind of dividing method of the three dimensional tooth mesh data based on reconciliation field algorithm |
| CN109146867A (en)* | 2018-08-24 | 2019-01-04 | 四川木牛流马智能科技有限公司 | Oral cavity curved surface CT image biological feature extraction and matching process and equipment |
| CN109146867B (en)* | 2018-08-24 | 2021-11-19 | 四川智动木牛智能科技有限公司 | Oral cavity curved surface CT image biological feature extraction and matching method and device |
| CN109598703A (en)* | 2018-11-19 | 2019-04-09 | 影为医疗科技(上海)有限公司 | Processing method, system, computer readable storage medium and the equipment of dental imaging |
| CN109993751A (en)* | 2019-03-11 | 2019-07-09 | 常熟理工学院 | Semi-automatic and accurate segmentation algorithm of teeth and jaws based on sag-aware harmonic scalar field |
| CN115619773A (en)* | 2022-11-21 | 2023-01-17 | 山东大学 | A method and system for three-dimensional tooth multimodal data registration |
| CN117455934A (en)* | 2023-12-22 | 2024-01-26 | 中南大学 | An enhanced segmentation method for abnormal lesion areas in oral CT |
| CN117455934B (en)* | 2023-12-22 | 2024-03-12 | 中南大学 | An enhanced segmentation method for abnormal lesion areas in oral CT |
| CN118866251A (en)* | 2024-07-08 | 2024-10-29 | 梅州市人民医院(梅州市医学科学院) | Plastic surgery plan generation method, device and storage medium based on medical images |
| CN118866251B (en)* | 2024-07-08 | 2025-01-07 | 梅州市人民医院(梅州市医学科学院) | Medical image-based orthopedic plan generation method, device and storage medium |
| Publication | Publication Date | Title |
|---|---|---|
| CN104392492A (en) | Computer interaction type method for segmenting single tooth crown from three-dimensional jaw model | |
| CN101393653B (en) | Method for reconstructing three dimensional model of complete teeth through CT data of dentognathic gypsum model and dentognathic panoramic perspective view | |
| JP7254025B2 (en) | dynamic arch map | |
| JP6531115B2 (en) | Method of 3D cephalometric analysis | |
| CN104715475B (en) | A kind of tooth jaw threedimensional model based on mediation field splits the method for whole coronas automatically | |
| TW471960B (en) | Manipulating a digital dentition model to form models of individual dentition components | |
| US6688886B2 (en) | System and method for separating three-dimensional models | |
| Zou et al. | Interactive tooth partition of dental mesh base on tooth-target harmonic field | |
| US9129363B2 (en) | Method for teeth segmentation and alignment detection in CBCT volume | |
| CN103494653B (en) | A kind of digital measuring method of tooth jaw growth-development law | |
| CN106228549A (en) | A kind of triangle gridding tooth dividing method based on path planning | |
| US11896452B2 (en) | Method for virtual setup with mixed dentition | |
| JP2021524789A (en) | Tooth virtual editing method, system, computer equipment and storage medium | |
| EP4144324A1 (en) | Intelligent design method for digital model for oral digital impression instrument | |
| CN107239649A (en) | A kind of method of oral cavity parametrization measurement | |
| CN110276758A (en) | Occlusal analysis system based on point cloud spatial features | |
| US20230419631A1 (en) | Guided Implant Surgery Planning System and Method | |
| CN106570859A (en) | Tooth image analysis system | |
| CN108038877A (en) | One kind visualization cephalometry method, system and computer-processing equipment | |
| CN109035408A (en) | A kind of three-dimensional digital tooth maxillary mandibular relation detection algorithm based on section | |
| CN101944156B (en) | Method for determining container of single tooth | |
| CN116883428A (en) | Mandible spiral CT image partition segmentation method | |
| CN116958169A (en) | A tooth segmentation method for three-dimensional jaw models | |
| CN105411716B (en) | A kind of edentulous jaw alveolar ridge intercuspal position Direct Determination | |
| CN119173954A (en) | Method and system for identifying islands of interest |
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication | Application publication date:20150304 |