CN111513883B - Method for manufacturing zirconia restoration based on photocuring rapid prototyping - Google Patents
Method for manufacturing zirconia restoration based on photocuring rapid prototyping Download PDFInfo
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- CN111513883B CN111513883B CN202010336563.3A CN202010336563A CN111513883B CN 111513883 B CN111513883 B CN 111513883B CN 202010336563 A CN202010336563 A CN 202010336563A CN 111513883 B CN111513883 B CN 111513883B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
- A61C13/083—Porcelain or ceramic teeth
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
- A61C13/0013—Production methods using stereolithographic techniques
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Abstract
The invention discloses a method for manufacturing a zirconia restoration based on photocuring rapid prototyping, which comprises the following steps: acquiring three-dimensional data of an abutment of a patient; designing a simulation restoration body according to the abutment three-dimensional data; designing a micro-contour structure on a prosthesis tissue surface in a partition manner; printing a restoration by using a photocuring rapid forming tool and taking photosensitive zirconia slurry as a raw material; degreasing, sintering and ultrasonically cleaning the printed prosthesis; the completely prepared prosthesis is bonded to the abutment. The micro-profile structure is arranged, so that the mechanical embedding effect can be increased, the bonding strength of the zirconia all-ceramic restoration body is improved, the stress concentration phenomenon is reduced, and the edge sealing is ensured; the convex or concave strip-shaped or net-shaped structure and the like can ensure uniform bonding clearance and uniform stress distribution on the premise of ensuring high sealing of the prosthesis; the invention can realize the molding of a fine structure of a tissue surface and avoid the condition of local deletion or crack.
Description
Technical Field
The invention relates to the field of manufacturing of dental restorations, in particular to a method for manufacturing a zirconia restoration body which is based on photocuring rapid prototyping and comprises a zirconia restoration body structure design.
Background
Zirconia ceramics have excellent physical and mechanical properties, aesthetic properties, and biocompatibility, and have been widely used in dental restoration in recent years.
However, zirconia ceramics have difficulty in providing sufficient mechanical locking force by surface acid etching to obtain a rough surface, and the chemical inertness of the ceramics themselves makes it difficult to form good chemical bonding with resin adhesives, and conventional physical and chemical treatment methods cannot achieve a desired bonding strength.
In order to improve the bonding effect, physical sand blasting and surface modification (silicon dioxide coating) methods are generally adopted clinically. Grit blasting often passes 110 μm Al2O3The particle and the pressure of 2.5bar make the nozzle and the bonding surface form an included angle of 45 degrees, so as to increase the roughness and small undercut of the zirconia bonding surface, and improve the bonding area and the mechanical locking force. However, this process is prone to microcrack formation and material surface loss, especially in
In stress concentration areas such as the face and the neck edge, the generation of microcracks and the loss of the surface of the material can greatly reduce the service life of the zirconia restoration body; meanwhile, the sand blasting effect of the zirconia can be influenced by the sand blasting time, distance, direction, area and the like, and the sand blasting is generally completed manually by operators, so that the influence factors cannot be accurately controlled, the sand blasting range and roughness are uncontrollable, and excessive loss of local areas of the surface of the material is easily caused to cause microcracks.
By directly adding the micro-contour design on the tissue surface of the zirconia restoration body for remanufacturing, the problem of micro-cracks generated by sand blasting treatment can be avoided while the bonding area and the mechanical locking action are effectively increased. However, the main processing method of the existing zirconia all-ceramic prosthesis is CAD/CAM cutting processing, and the process has the problems of lathe needle vibration, large brittleness of a zirconia blank and the like, and is difficult to cut for some fine structures and inverted concave structures, so that the manufacture of the zirconia prosthesis with a micro-contour design on a tissue surface is difficult to realize.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the method for manufacturing the zirconia restoration based on the photocuring rapid prototyping is provided, so as to solve the problems that the traditional restoration manufacturing process is difficult to cut a fine structure and an undercut structure, or the local area on the surface of a crown body is easily lost to cause cracks.
The technical scheme adopted by the invention is as follows:
a zirconia restoration body manufacturing method based on photocuring rapid prototyping comprises the following steps:
A. three-dimensional data of the patient's abutment is acquired.
B. And designing a simulation restoration body according to the abutment three-dimensional data. The prosthesis can be designed into an integrated full-anatomic crown structure or a bottom crown structure, and then the finished crown is obtained by stacking and molding facing porcelain on the manufactured bottom crown.
C. And designing a micro-contour structure on the tissue surface of the prosthesis in a partition manner.
D. And printing the restoration by using a photocuring rapid forming tool and taking the photosensitive zirconia slurry as a raw material.
E. And carrying out degreasing treatment on the printed prosthesis.
F. And sintering the prosthesis.
G. And ultrasonically cleaning the prosthesis.
H. The completely prepared prosthesis is bonded to the abutment.
The method utilizes the photocuring rapid prototyping technology to shape the restoration body at one time, does not need cutting or sand blasting procedures, and avoids the condition that the service life of the restoration body is influenced by the surface loss or the cracks of the crown body. In addition, the method also increases the contact area between the prosthesis and the adhesive (usually resin adhesive), thereby increasing the mechanical embedding effect and improving the bonding strength of the zirconia all-ceramic prosthesis.
Further, the step C includes:
micro-contour structures are arranged on the tissue surface of the prosthesis in a partition mode, and the micro-contour structures are not designed in the occlusal force bearing area and the cervical margin area of the prosthesis. The tissue surface partition of the prosthesis, the occlusal force bearing area and the cervical margin area are all positioned on one side (namely an inner concave surface) where the prosthesis is contacted with the abutment.
The method can reduce the stress concentration phenomenon, ensure the edge sealing property and avoid the occurrence of edge micro-leakage.
Further, the micro-profile structure is a dot, strip, net structure or a combination thereof.
Further, the micro-profile structure is a convex structure, a concave structure or a combination thereof. The design of the convex or concave structure can provide a plurality of structural choices to realize better matching with the specific prosthesis space and the bonding clearance.
Further, the degreasing treatment in the step E is: carrying out low-temperature degreasing treatment at 0-600 ℃.
Further, the sintering treatment in the step F is: sintering at 1440-1550 ℃ for 2 h.
Further, the step G specifically includes: and ultrasonically cleaning the prosthesis for 10min by using ethanol and drying.
Further, the step H includes:
h1: preparing a silicon dioxide coating on the prosthesis bonding surface;
h2: after trying on the prosthesis, cleaning the prosthesis bonding surface by using 37% of phosphoric acid by mass fraction for 60 s;
h3: coating a silane coupling agent on the bonding surface of the restoration;
h4: adhering the prosthesis to an abutment by using a resin adhesive, wherein the tooth body of the abutment is subjected to full acid etching or self acid etching according to the proportion of enamel and dentin of the abutment; namely, the prosthesis is adhered to the abutment which is completely acid-etched or self-acid-etched on the tooth body.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention increases the contact area with the resin adhesive through the micro-contour (shape and size) design of the tissue surface of the zirconia restoration, thereby increasing the mechanical embedding effect and improving the bonding strength of the zirconia all-ceramic restoration.
2. The micro-profile design of the tissue surface of the zirconia prosthesis comprises a convex or concave strip-shaped or net-shaped structure and the like, the micro-profile can be selected to be convex or concave according to the repair space and the bonding gap, the bonding gap is uniform on the premise of ensuring the high sealing of the prosthesis, and the uniform distribution of stress is ensured.
3. The invention relates to a micro-contour partition design of a prosthesis tissue surface, which is characterized in that
The tissue surface of the surface and the neck edge is not designed with a micro-profile structure, thereby reducing the stress concentration phenomenon and ensuring the edge sealing.
4. The invention uses the photocuring rapid prototyping technology to print the zirconia restoration body with the micro-contour design, can realize the manufacturing and the prototyping of the fine contour design of the tissue surface, and avoids the situation of local deletion or crack.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a structure of a conventional prosthesis.
FIG. 2 is a label
The face and the neck edge, etc. do not need to design the regional view of the micro-contour.
Fig. 3 is a diagram of the zonal addition of micro-contour structures to a tissue side of a prosthesis.
Fig. 4 shows 6 embodiments of the micro-profile structure.
Fig. 5 is a flowchart of a method of manufacturing a zirconia prosthesis.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
The embodiment discloses a prosthesis with a micro-contour structure. Specifically, as shown in FIG. 3, the micro-contour structure is designed on the tissue side of the prosthesis
The surface and other occlusion force bearing areas are not designed with micro-profile structures to reduce the stress concentration phenomenon, and the neck edge area (within 1.0mm from the neck edge line) is not designed with micro-profile structures to ensure the edge sealing performance and avoid the occurrence of edge micro-leakage.
As shown in fig. 4, the micro-profile structure may be a convex structure or a concave structure, which is selected according to the repair space and the bonding gap.
In the specific design, as shown in fig. 4, the micro-profile structure is a dot, strip or net structure or a combination thereof. Al commonly used for reference zirconia2O3The particle size of the sand blasting particles and the size of the micro-outline structure are controlled to be 100-120 mu m.
Example two
The embodiment discloses a method for manufacturing a zirconia restoration based on photocuring rapid prototyping, which comprises the following steps with reference to the attached drawing 5:
A. three-dimensional data of the patient's abutment is acquired.
There are various ways to obtain three-dimensional data of an abutment, such as by scanning an abutment in the mouth of a patient with a dental scanning device (e.g., 3shape, bathing 3D dentellascan, etc.), or by preparing an end impression of the mouth of a patient and then scanning the end impression.
B. And designing a simulation restoration body according to the abutment three-dimensional data. The prosthesis has two optional design structures, one is an integrated full-dissection crown structure, the other is a bottom crown structure, and after the bottom crown is formed, a facing porcelain is piled and molded on the surface of the bottom crown to form the complete crown. Regardless of the design structure, the key point of the invention lies in the micro-contour structure design of the tissue surface, namely the structure of the inner concave surface part.
The prosthesis is a denture part arranged on an abutment, and can be obtained by performing conventional design through dental model software. Common dental model software is dental CAD software, such as 3shape, exocad, etc.
C. And designing a micro-contour structure on the tissue surface of the prosthesis in a partition manner.
This is a significant improvement over the present design. In the traditional zirconia prosthesis and the abutment, the direct bonding is realized by the effect as shown in figure 1, but zirconia ceramics are difficult to obtain rough surfaces through surface acid etching and provide enough mechanical locking force, and the chemical inertness of the ceramics also makes the ceramics difficult to form good chemical bonding with resin adhesives, so that the ideal bonding strength cannot be achieved by the conventional physical and chemical treatment method. Meanwhile, the traditional process is limited by the capacity of technicians and the structure of the machine needle, so that an ideal micro-contour structure cannot be cut on the tissue surface of the prosthesis, and even cutting defects or cracks can be caused.
The design designs a micro-contour structure on a prosthesis tissue surface in a partition mode, and then the prosthesis is printed in one step through the subsequent photocuring rapid forming step, so that the prosthesis with the micro-contour structure is directly manufactured. Specifically, the process of designing the micro-profile structure includes:
in one embodiment, the micro-contour structure is added to the tissue surface of the prosthesis in a partition way
The occlusal force bearing area such as the surface and the like is not designed with a micro-profile structure to reduce the stress concentration phenomenon, and the cervical rim area (within 1.0mm from the cervical rim line) is not designed with a micro-profile structure to ensure the edge tightness and avoid the occurrence of edge micro-leakage, as shown in fig. 2, wherein (a) is a diagram of the cervical rim area, (b) is a diagram of the occlusal force bearing area, and (c) is a model diagram of a repair diagram marking the cervical rim area and the occlusal force bearing area. In one embodiment, the micro-profile structure may be a convex or concave point-like structure, a stripe-like structure, a mesh-like structure (or a combination thereof), etc., as shown in fig. 3, wherein (a), (b), and (c) are a point-like micro-profile design, a stripe-like micro-profile design, and a mesh-like micro-profile design in sequence. The micro-profile structure is selected to be convex or concave according to the repair space and the bonding gap, as shown in fig. 4, so that the thickness of the repair material is consistent to ensure the strength of the repair, and the bonding gap is uniform to ensure the uniform distribution of stress. In fig. 4, (a) is a convex point-like micro-profile design, (b) is a concave point-like micro-profile design, (c) is a convex strip-like micro-profile design, (d) is a concave strip-like micro-profile design, (e) is a convex net-like micro-profile design, and (f) is a concave net-like micro-profile design.
D. And printing the restoration by using a photocuring rapid forming tool and taking the photosensitive zirconia slurry as a raw material.
And (2) considering sintering shrinkage, proportionally amplifying the restoration data, inputting the data into a 3D printer, and printing the restoration by using a photocuring rapid prototyping technology (such as an SLA (stereo lithography) or DLP (digital light processing) technology) by using the photosensitive zirconia slurry as a raw material.
E. And carrying out degreasing treatment on the printed prosthesis.
Specifically, the printed coping is degreased at low temperature of 0-600 ℃ to remove organic matters.
F. And sintering the prosthesis.
Specifically, the restoration is sintered for 2h at 1440-1550 ℃.
G. And ultrasonically cleaning the prosthesis.
Specifically, the cleaning process adopts ethanol ultrasonic cleaning for 10min and drying.
H. The completely prepared prosthesis is bonded to the abutment.
The specific process of adhering the prosthesis to the abutment includes:
firstly, preparing a silicon dioxide coating on the bonding surface of the zirconia restoration; after trying on the prosthesis, 37 mass percent of phosphoric acid is used for cleaning pollutants such as saliva, blood and the like on the bonding surface of the prosthesis for 60 s; and then coating a silane coupling agent on the bonding surface of the zirconia restoration. Finally, the prosthesis is adhered to the abutment by using a resin adhesive, and the tooth body of the abutment is subjected to full acid etching or self acid etching according to the proportion of the enamel and the dentin of the abutment, and the effect is shown in figure 3.
EXAMPLE III
The embodiment discloses a method for manufacturing a zirconia restoration based on photocuring rapid prototyping, as shown in fig. 5, which comprises the following steps:
A. the abutment is scanned using a dental optical scanning device and abutment three-dimensional data is acquired and stored in STL format.
B. The STL file is imported into dental CAD software to design a final restoration of the defect, as shown in fig. 1.
C. Adding a micro-contour structure on a prosthesis tissue surface in a partition manner:
using three-dimensional modeling software to add micro-contour structure to the tissue surface of the prosthesis in a partition way, as shown in figure 2
The surface occlusion force bearing area and the like are not designed with a micro-profile structure to reduce the stress concentration phenomenon, and the neck edge area (within 1.0mm from the neck edge line) is not designed with a micro-profile to ensure the edge sealing property, thereby avoiding the occurrence of edge micro-leakage.
As shown in FIG. 3, the micro-profile structure may be a convex or concave dot, a stripe, a net, etc. Al commonly used for reference zirconia2O3The grain diameter and the micro-contour size of the sand blasting particles are controlled in100-120 μm. The micro-profile structure is selected to be convex or concave according to the repair space and the bonding gap (figure 4), so that the thickness of the repair material is consistent to ensure the strength of the repair material, and the bonding gap is uniform to ensure the uniform distribution of stress.
D. Photocuring rapid prototyping printing of the restoration: and (4) considering sintering shrinkage, proportionally amplifying the restoration data, inputting the data into a 3D printer, and printing the restoration by using a photocuring rapid prototyping device by using photosensitive zirconia slurry as a raw material.
E. And degreasing the restoration at low temperature of 0-600 ℃ to remove organic matters.
F. Sintering the degreased restoration at 1440-1550 ℃ for 2 h.
G. Ultrasonic cleaning of the zirconia restoration: ultrasonically cleaning with ethanol for 10min and drying.
H. Bonding a zirconia restoration body: firstly, preparing a silicon dioxide coating on the bonding surface of the zirconia restoration, cleaning pollutants such as saliva, blood and the like on the bonding surface of the restoration for 60s by using 37 mass percent of phosphoric acid after the restoration is tried on, and then coating a silane coupling agent on the bonding surface of the zirconia restoration. Finally, the prosthesis and the abutment are bonded by using a resin adhesive, and the tooth body of the abutment is subjected to full acid etching or self acid etching according to the proportion of the enamel and the dentin of the abutment. .
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (7)
1. A zirconia restoration body manufacturing method based on photocuring rapid prototyping is characterized by comprising the following steps:
A. acquiring three-dimensional data of an abutment of a patient;
B. designing a simulation prosthesis according to the three-dimensional data of the abutment, wherein the side, in contact with the abutment, of the prosthesis is designed to be concave;
C. designing a micro-profile structure on a prosthesis tissue surface in a partition mode, not designing the micro-profile structure on an occlusal force bearing area and a cervical margin area of the prosthesis, and positioning the prosthesis tissue surface partition, the occlusal force bearing area and the cervical margin area on one side, in contact with an abutment, of the prosthesis;
D. printing the restoration by using a photocuring rapid forming tool and taking photosensitive zirconia slurry as a raw material;
E. carrying out degreasing treatment on the printed prosthesis;
F. sintering the prosthesis;
G. ultrasonically cleaning the prosthesis;
H. adhering the completely prepared prosthesis to the abutment.
2. The zirconia prosthesis production method of claim 1, wherein said micro-contour structure is a dot, a stripe, a mesh structure or a combination thereof.
3. The zirconia prosthesis production method of claim 1 or 2, wherein the micro-profile structure is a convex, concave or a combination thereof.
4. The zirconia prosthesis production method of claim 1, wherein the degreasing treatment in the step E is: carrying out low-temperature degreasing treatment at 0-600 ℃.
5. The zirconia prosthesis manufacturing method of claim 1, wherein the sintering treatment in the step F is: sintering at 1440-1550 ℃ for 2 h.
6. The zirconia prosthesis manufacturing method of claim 1, wherein said step G specifically is: and ultrasonically cleaning the prosthesis for 10min by using ethanol and drying.
7. The zirconia prosthesis manufacturing method of claim 1, wherein said step H comprises:
h1: preparing a silicon dioxide coating on the prosthesis bonding surface;
h2: after trying on the prosthesis, cleaning the prosthesis bonding surface by using 37% of phosphoric acid by mass fraction for 60 s;
h3: coating a silane coupling agent on the bonding surface of the restoration;
h4: the prosthesis is bonded to an abutment having a tooth body subjected to full acid etching or self acid etching depending on the ratio of enamel to dentin of the abutment using a resin adhesive.
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