CN115531014B - Dental crown lengthening operation guide plate and manufacturing method thereof - Google Patents
Dental crown lengthening operation guide plate and manufacturing method thereof Download PDFInfo
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- CN115531014B CN115531014B CN202211524113.2A CN202211524113A CN115531014B CN 115531014 B CN115531014 B CN 115531014B CN 202211524113 A CN202211524113 A CN 202211524113A CN 115531014 B CN115531014 B CN 115531014B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C9/00—Impression cups, i.e. impression trays; Impression methods
- A61C9/004—Means or methods for taking digitized impressions
- A61C9/0046—Data acquisition means or methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/06—Implements for therapeutic treatment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/007—Dental splints; teeth or jaw immobilisation devices; stabilizing retainers bonded to teeth after orthodontic treatments
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
Abstract
The invention provides a dental crown lengthening guide plate which comprises a dental surface attaching part and a bone tissue cutting positioning part, wherein the upper edge of the dental surface attaching part is provided with a soft tissue cutting edge, the lower edge of the bone tissue cutting positioning part is provided with a bone tissue cutting edge, the soft tissue cutting edge and the bone tissue cutting edge are encircled to form a window opening part, and an intermittent hole is arranged at the joint of the dental surface attaching part and the bone tissue cutting positioning part.
Description
Technical Field
The invention relates to the field of stomatology, in particular to a dental crown lengthening operation guide plate and a manufacturing method thereof.
Background
The crown lengthening is to reduce the gingival margin position by an operation method, remove the corresponding alveolar bone to expose a healthy tooth structure, lengthen an excessively short clinical crown, and thus facilitate the restoration of teeth or solve aesthetic problems.
Crown lengthening aims at reconstructing the biological breadth from the root while exposing more tooth structure. The biological width is the distance from the gingival sulcus to the crest of the alveolar ridge, and is the sum of the widths of connective tissues attached to the root surface on the side of the combined epithelium and the crest of the alveolar ridge, and the average width is 2.04mm. In order to achieve a harmonious, successful long-term restoration, a 3mm tooth structure should be sufficiently exposed between the alveolar bone and the ideal gingival margin, thereby improving the biological width and gingival sulcus depth. The basic method of the crown lengthening operation comprises the following steps: the use of a flap in combination with an osteotomy reduces the level of the crest and margin of the alveolar ridge, thereby extending the clinical crown while maintaining a normal biological breadth.
The gingival position is often finally determined by means of guide plates in the dental crown lengthening operation, and the traditional guide plates comprise a resin crown guide plate, a diagnosis wax pattern guide plate and a pressing mold guide plate, which cause the uncertainty of the operation due to poor accuracy, incapability of indicating the bone removal amount and the like. With the development of computer-aided design and computer-aided manufacturing in oral treatment, a simulated oral environment is created by integrating imaging data of soft and hard tissues, and a digital double-positioning crown lengthening operation guide plate is designed and manufactured, and can simultaneously and accurately position the height of a gum tissue and the height of an alveolar bone in a crown lengthening operation. The common tools for bone trimming in the operation are round drills or carborundum drill needles and bone chisels or bone tongs on a turbine handpiece, a turbine is used for trimming the appearance of bones in a region with an extended crown, a large No. 8 round drill is commonly used, the motion needs to lightly and intermittently grind off bone substances, cooling water needs to be led in the bone removing process so as to avoid bone necrosis caused by temperature rise, and the damage to the root surfaces of teeth needs to be avoided. The bone in contact with the teeth is then removed with an mechanical osteotome or rongeur, preventing damage to the root surface. Compared with the traditional guide plate, the double-guide plate technology has the advantages of being minimally invasive, accurate, reducing iatrogenic difference and the like, the height of the alveolar bone is positioned, the thickness of the removed bone cannot be indicated in the operation, and the risk of damaging the root surface of the tooth is still existed when the bone outline and the tooth root outline are not consistent.
After the crown lengthening operation is finished, the root of the tooth is exposed, and at the moment, temporary veneering restoration is needed, so that the problems of attractiveness and tooth sensitivity of a patient before final restoration are solved, and good tooth waistline is formed to promote better healing of gum soft tissues. However, when the crown lengthening operation is completed, the operation area should be prevented from being polluted as much as possible, at this time, the temporary restoration is directly manufactured in the mouth, secondary stimulation is generated on the wound, the wound infection and other situations may occur, the gingival bleeding and swelling and other situations exist immediately after the operation, and the later effect is affected by the lack of fit of the edge of the temporary restoration manufactured by directly repairing in the mouth.
Disclosure of Invention
Aiming at the prior art, the invention aims to solve the defects in the prior art and provides a dental crown lengthening guide plate and a manufacturing method thereof, which are used for accurately positioning the height and thickness of the bone removal amount of an alveolar bone for lengthening a dental crown by taking restoration as a guide and improving a temporary veneering after the dental crown lengthening.
Specifically, the invention provides the following technical scheme:
in one aspect, the invention provides a dental crown lengthening guide plate, which comprises a tooth surface attaching part and a bone tissue cutting positioning part, wherein the upper edge of the tooth surface attaching part is provided with a soft tissue cutting edge, the lower edge of the bone tissue cutting positioning part is provided with a bone tissue cutting edge, the soft tissue cutting edge and the bone tissue cutting edge are enclosed to form a window opening part, an intermittent hole is arranged at the joint of the tooth surface attaching part and the bone tissue cutting positioning part, and the sum of the thickness of the bone tissue cutting edge and the thickness of an alveolar bone at the joint is 4mm.
Furthermore, cavities distributed along the bone tissue cutting edge are arranged at the position, attached to the alveolar bone, of the bone tissue cutting edge of the bone tissue cutting positioning part.
In another aspect, the present invention also provides a method for manufacturing the dental crown lengthening guide plate, including the steps of:
s1, intraoral scanning to obtain dentition scanning data of a patient, shooting the dentition and jaw CBCT, obtaining three-dimensional topography data of the dentition and the jaw, and registering the dentition scanning data, the dentition and the jaw CBCT data in repair design software;
s2, calculating the length-width ratio of each tooth in the anterior dental area of the patient to obtain the final width and length numerical value of each tooth in the anterior dental area, wherein the width-length ratio of the middle incisor is 75-85%, the width value of the lateral incisor is 70% of that of the middle incisor, the width value of the cuspid is 49% of that of the middle incisor, and the width-length ratio of the lateral incisor and the cuspid is 80%;
s3, according to the obtained width and length values of each tooth in the anterior tooth area, marking the position of the soft tissue cutting edge in restoration design software, drawing the three-dimensional shape of a soft tissue guide plate on the three-dimensional appearance of dentition and jaw bone, obtaining the soft tissue guide plate, and outputting the data of the soft tissue guide plate;
s4, marking the position of the bone tissue cutting edge at a position 3mm above the position of the soft tissue cutting edge in the repair design software, drawing the three-dimensional shape of the bone tissue guide plate on the three-dimensional topography of dentition and jaw bone according to the position of the bone tissue cutting edge, obtaining the bone tissue guide plate, and outputting the data of the bone tissue guide plate;
s5, importing the soft tissue guide plate data and the bone tissue guide plate data into reverse engineering software, windowing the middle of the bone tissue guide plate by using Boolean operation, forming a tooth surface attaching part at the lower part of the windowing part, forming a soft tissue cutting edge at the lower edge of the windowing part, forming a bone tissue cutting positioning part at the upper part of the windowing part, and forming a bone tissue cutting edge at the upper edge of the windowing part;
s6, carrying out tooth segmentation processing on the dentition and jaw CBCT data in reverse engineering software to obtain tooth labial surface alveolar bone data needing to be operated, obtaining the alveolar bone tissue thickness corresponding to each tooth labial surface on the bone tissue resection edge, calculating the thickness of the bone tissue resection edge according to the condition that the sum of the thickness of the bone tissue resection edge and the thickness of the alveolar bone tissue at the position is 4mm, and assigning the thickness of the bone tissue resection edge to a bone tissue resection positioning part;
s7, in the reverse engineering software, an intermittent hole is arranged at the joint of the tooth surface attaching part and the bone tissue cutting positioning part to obtain the data of the dental crown lengthening surgery guide plate;
and S8, importing the data of the dental crown lengthening operation guide plate into repair design software, and finishing the dental crown lengthening operation guide plate through 3D printing.
Further, step S6 includes forming cavities distributed along the bone tissue resection edge at the position where the bone tissue resection edge is attached to the alveolar bone. The cavity is used for accommodating a drill point of the ball drill, and the purpose is to position the drill point of the ball drill in the cavity from the position corresponding to the bone tissue cutting edge when the dental crown lengthening operation guide plate is used, and drill into the alveolar bone vertically towards the root surface, so that the guide plate at the bone tissue cutting edge cannot interfere with the rotation of the ball drill.
Preferably, the dentition scan data, the soft tissue guide data, the bone tissue guide data, and the crown lengthening guide data are STL files.
Preferably, the reverse engineering software is Geomagic, and the repair design software is 3shape dental system.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
compared with the existing double-guide-plate technology, the dental crown lengthening guide plate manufactured by taking repair as guide through a digital method not only indicates the bone removing position from the horizontal height, but also further indicates the bone removing amount thickness from the vertical height through the CBCT segmentation technology, the dental crown lengthening guide plate can better protect the tooth root from being damaged, and the bone removing amount is completely repaired to the same height through the thickness of the guide plate.
The tooth surface attaching part guide plate for covering the tooth surface in the front tooth area of the dental crown lengthening operation guide plate can be used as a soft tissue cutting edge position to guide a crown lengthening operation, and after an interrupted hole at the joint of the tooth surface attaching part and the bone tissue cutting positioning part is disconnected, the tooth surface attaching part guide plate is easily separated from other parts, and can be directly used as a temporary veneering after the operation is finished, and the temporary prosthesis does not need to be directly manufactured in the mouth again, so that the situations that secondary stimulation is generated on the wound, the wound infection and other repairing effects are influenced are avoided.
The dental crown lengthening operation guide plate can ensure that an operator can stably control the ball drill in the operation, and avoid accidental injury to tooth tissues, thereby better serving patients in periodontal surgery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a coronal plane of a crown lengthening guide of the present invention;
FIG. 2 is a schematic sagittal view of a crown lengthening guide plate according to the present invention;
FIG. 3 is a first schematic sagittal view of a bone removed using the crown lengthening guide of the present invention;
FIG. 4 is a schematic view in sagittal plane II of bone removal using the crown lengthening guide of the present invention;
FIG. 5 is a flow chart of a method of manufacturing a crown lengthening guide of the present invention;
reference numerals: 100-dental crown; 200-soft tissue; 300-alveolar bone; 400-crown lengthening guide plate; 500-ball drilling; 600-root of tooth; 410-tooth surface fitting part; 411 — soft tissue resection margins; 420-a windowing portion; 421-interrupted holes; 430-bone tissue resection positioning part; 431-bone tissue resection margins; alveolar bone superior border-433; a cavity-434; alveolar bone lower margin-432; a drill point-510; a first lever-520; a guide table-530; a second mast-540.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be appreciated by those of skill in the art that the following specific examples or embodiments are set forth in a series of optimized configurations for further explanation of the specific disclosure, and that all such configurations may be combined or used in conjunction with one another, unless specifically set forth herein as being incompatible with or used in conjunction with other embodiments or embodiments. Meanwhile, the following specific examples or embodiments are only provided as an optimized arrangement mode and are not to be understood as limiting the protection scope of the present invention.
In a specific embodiment, as shown in fig. 1 and 2, the present invention provides a crown lengthening guide 400, which comprises a tooth surface attaching part 410 and a bone tissue cutting positioning part 430, wherein an upper edge of the tooth surface attaching part 410 is provided as a soft tissue cutting edge 411, a lower edge of the bone tissue cutting positioning part 430 is provided as a bone tissue cutting edge 431, the soft tissue cutting edge 411 and the bone tissue cutting edge 431 are enclosed to form a window opening part 420, and an interrupted hole 421 is provided at a connection part of the tooth surface attaching part 410 and the bone tissue cutting positioning part 430. The bone tissue cutting edge 431 of the bone tissue cutting positioning part 430 is provided with a cavity 434 attached to the alveolar bone 300, and the cavity 434 is distributed along the bone tissue cutting edge, so that when the guide plate is used for removing bones, the rotation of the ball drill is not interfered by the attachment of the bone tissue cutting edge 431 and the alveolar bone 300, the lower part of the bone tissue cutting edge is provided with the cavity 434 with the width of 0.35mm and the height of 1mm and the length extending along the bone tissue cutting edge, and the guide plate at the bone tissue cutting edge cannot interfere the rotation of the ball drill.
Because the thickness difference of the labial alveolar bone tissues of different teeth is large, and the thickness of the alveolar bone tissues of different sites of the same tooth is inconsistent, in order to better protect the root surface of the tooth root during the bone removing operation, the dental crown lengthening operation guide plate needs to be utilized to complement the difference, so that an operator can conveniently remove the bone tissues at a uniform distance, and the precise control of the operation is facilitated. Therefore, by controlling the sum of the thickness of the bone tissue cutting edge 431 and the thickness of the alveolar bone at the position to be 4mm, an accurate guide plate is manufactured, and then the guide plate guides the bone removal so as to accurately obtain the thickness of the removed alveolar bone, thereby avoiding damage to the tooth root.
At present, the instrument for bone resection and bone forming in the crown lengthening operation is a ball drill, but the existing ball drill can not be matched with the crown lengthening operation guide plate of the invention for removing bones, and in order to be matched with the crown lengthening operation guide plate of the invention, the invention provides a novel ball drill, as shown in fig. 3 and 4, the ball drill 500 comprises a drill point 510, a first machine rod 520, a guide table 530 and a second machine rod 540 which are coaxially connected, the diameter of the drill point is 2mm, the height of the drill point is 1mm, the diameter of the first machine rod is 1.5mm, the length of the first machine rod is 3mm, the upper part of the first machine rod is formed into an annular convex guide table, and the diameter of the guide table is 6.5mm, the height of the guide table is 2mm, and the diameter of the second machine rod is 2.35mm. Referring to fig. 3 and 4, fig. 3 shows the initial position of the ball drill, in which the guide table 530 has not yet contacted the bone tissue cutting positioning portion of the guide plate, and the ball drill drills toward the alveolar bone to the bone removal end position shown in fig. 4, in which the guide table has contacted the bone tissue cutting positioning portion of the guide plate, the ball drill of the present invention is just sized and configured to ensure that the sum of the thickness of the bone tissue cutting edge 431 and the thickness of the alveolar bone is 4mm, thereby preventing injury to the root of the tooth, and the first shaft 520 has a wider portion of the drill point than the first shaft accommodated in the cavity 434 when guided bone removal is performed against the bone tissue cutting edge 431, so that the guide plate at the bone tissue cutting edge does not interfere with the rotation of the drill point.
Preferably, the first lever 520 has a smooth surface to prevent damage to the guide plate when rotating at high speed.
As the preferred technical scheme of the invention, the connecting position of the tooth surface attaching part 410 and the bone tissue cutting positioning part 430 is provided with the interrupted hole 421, which is a scheme that is not adopted by the existing guide plate at present, so that the guide plate of the tooth surface attaching part is easily separated from other parts, can be directly used as a temporary veneer after the operation is finished, and the temporary prosthesis is not required to be directly manufactured in the mouth again, thereby avoiding the conditions of secondary stimulation to the wound, wound infection and other influences on the repair effect.
In order to obtain the above crown lengthening guide, in another embodiment, the present invention provides a method for manufacturing a crown lengthening guide, as shown in fig. 5, comprising the following specific steps:
s1, obtaining a dentition scanning data STL file of a patient by using a 3shape intraoral scanner, shooting a dentition and jaw bone CBCT (cone beam CT), obtaining dentition and jaw bone three-dimensional appearance data, and registering the dentition scanning data, the dentition and jaw bone CBCT data in a repair design software 3shape digital system; intraoral scanning and CBCT imaging are well known in the art, although other suitable equipment in the art may be used to obtain the data.
S2, calculating the length-width ratio of each tooth of the front teeth of the patient to obtain the final width and height numerical values of each tooth of the front tooth area, wherein the width-length ratio of the middle incisor is 75-85%, the width value of the lateral incisor is 70% of that of the middle incisor, the width value of the cuspid is 49% of that of the middle incisor, and the width-length ratio of the lateral incisor and the cuspid is 80%;
s3, according to the obtained width and length degree values of each tooth in the anterior tooth area, marking the position of the cut edge of the soft tissue in a restoration design software 3shape digital system, drawing the three-dimensional shape of the soft tissue guide plate on the dentition and jaw three-dimensional appearance, obtaining the soft tissue guide plate, and outputting a soft tissue guide plate data STL file;
s4, marking the position of the bone tissue resection edge at a position 3mm above the soft tissue resection edge according to the position of the soft tissue resection edge in the repair design software 3shape digital system, wherein the position of the bone tissue resection edge needs to meet biological width value (2.04 mm, namely the epithelial attachment width is 0.97mm + the width of the connective tissue above the crest of the bone is 1.07 mm) and gingival sulcus width value (1 mm), which is close to 3mm, fully exposing a 3mm tooth structure between an alveolar bone and an ideal gingival margin so as to obtain harmonious and successful long-term recovery, then drawing the three-dimensional shape of the bone tissue guide plate according to the position of the bone tissue resection edge on the three-dimensional shapes of dentition and jawbone, obtaining the bone tissue guide plate, and outputting a bone tissue guide plate data STL file;
s5, importing the soft tissue guide plate data and the bone tissue guide plate data into reverse engineering software Geomagic, windowing the middle of the bone tissue guide plate by using Boolean operation, forming a tooth surface attaching part at the lower part of the windowing part, forming a bone tissue cutting positioning part at the lower part of the windowing part, and forming a bone tissue cutting positioning part at the upper part of the windowing part, wherein the bone tissue cutting edge is the upper edge of the windowing part;
s6, tooth segmentation processing is carried out on the tooth row and jaw CBCT data in reverse engineering software Geomagic, specifically, identification is carried out according to different thresholds of alveolar bone tissues and tooth root dental tissues, tooth labial surface alveolar bone data needing to be operated are extracted and obtained, the thickness of the alveolar bone tissue corresponding to each tooth labial surface on the bone tissue resection edge is obtained, as shown in fig. 2, the bone tissue resection edge 431 is perpendicular to the alveolar bone surfaces, the extension surface of the bone tissue resection edge 431 and the alveolar bone are intersected on an alveolar bone upper edge 433 and an alveolar bone lower edge 432, and the distance between the alveolar bone upper edge 433 and the alveolar bone lower edge 432 is the thickness of the alveolar bone tissues;
then, the thickness of the bone tissue cutting edge is calculated, because the thickness of the alveolar bone 2mm below the crest of the median bone on the anterior maxillary labial side and only 2.2% of the thickness of the root middle site are more than 2mm, the guide plate needs to have the thickness of at least 1mm to maintain the strength of the guide plate, therefore, the strength and the operation visual field of the guide plate can be completely ensured to be clear within the range of the thickness of the alveolar bone cutting edge by 4mm, and the method for calculating the thickness of the bone tissue cutting edge is defined as follows: the sum of the thickness of the bone tissue cutting edge and the thickness of the alveolar bone tissue at the position is 4mm, and the thickness of the bone tissue cutting edge is assigned to the bone tissue cutting positioning part, and the specific operation is as follows: in the reverse engineering software Geomagic, the surface of the tooth root selects the range corresponding to the guide plate of the bone tissue resection positioning part, the thickness of the range is increased by 4mm to obtain data A, the alveolar bone data in the same area is selected as data B, boolean operation is carried out on the data A and the data B, and the data A and the data B are superposed and subtracted to obtain the guide plate data of the bone tissue resection positioning part. In order to make the dental crown lengthening operation guide plate manufactured by the method can be directly used for temporary veneering, a step S61 is further added, a discontinuous hole is arranged at the joint of the dental surface veneering part and the bone tissue cutting positioning part, the concrete operation is that cylinders with the diameter of 1mm are continuously placed at intervals at the joint in reverse engineering software, the interval distance of each cylinder is 1mm, and the guide plate data and the cylinder data are subtracted through Boolean operation to obtain the guide plate data with the discontinuous hole
Furthermore, cavities distributed along the cut edge of the bone tissue are additionally arranged at the position where the cut edge of the bone tissue is attached to the alveolar bone. The cavity is used for accommodating a drill point of the ball drill, and the purpose is to position the drill point of the ball drill in the cavity from the position corresponding to the bone tissue cutting edge when the dental crown lengthening operation guide plate is used, and drill into the alveolar bone vertically towards the root surface, so that the guide plate at the bone tissue cutting edge cannot interfere with the rotation of the ball drill.
And S7, obtaining a dental crown lengthening operation guide plate data STL file, importing the dental crown lengthening operation guide plate data STL file into repair design software, and finishing the dental crown lengthening operation guide plate through 3D printing.
The above are preferred embodiments of the present invention. It should be noted that the logic and/or steps shown in the flowcharts or otherwise described herein may be embodied in any readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A method for manufacturing a crown lengthening guide plate, comprising the steps of:
s1, intraoral scanning to obtain dentition scanning data of a patient, shooting the dentition and jaw CBCT, obtaining three-dimensional topography data of the dentition and the jaw, and registering the dentition scanning data, the dentition and the jaw CBCT data in repair design software;
s2, calculating the length-width ratio of each tooth in the anterior dental area of the patient to obtain the final width and length numerical value of each tooth in the anterior dental area, wherein the width-length ratio of the middle incisor is 75-85%, the width value of the lateral incisor is 70% of that of the middle incisor, the width value of the cuspid is 49% of that of the middle incisor, and the width-length ratio of the lateral incisor and the cuspid is 80%;
s3, according to the obtained width and length values of each tooth in the anterior tooth area, marking the position of the soft tissue cutting edge in restoration design software, drawing the three-dimensional shape of a soft tissue guide plate on the three-dimensional appearance of dentition and jaw bone, obtaining the soft tissue guide plate, and outputting the data of the soft tissue guide plate;
s4, marking the position of the bone tissue cutting edge at a position 3mm above the position of the soft tissue cutting edge in the repair design software, drawing the three-dimensional shape of the bone tissue guide plate on the three-dimensional topography of dentition and jaw bone according to the position of the bone tissue cutting edge, obtaining the bone tissue guide plate, and outputting the data of the bone tissue guide plate;
s5, importing the soft tissue guide plate data and the bone tissue guide plate data into reverse engineering software, windowing the middle of the bone tissue guide plate by using Boolean operation, forming a tooth surface attaching part at the lower part of the windowing part, forming a soft tissue cutting edge at the lower edge of the windowing part, forming a bone tissue cutting positioning part at the upper part of the windowing part, and forming a bone tissue cutting edge at the upper edge of the windowing part;
s6, carrying out tooth segmentation processing on the dentition and jaw CBCT data in reverse engineering software to obtain tooth labial and alveolar bone data needing to be operated, obtaining the alveolar bone tissue thickness corresponding to each tooth labial surface on the bone tissue resection edge, calculating the thickness of the bone tissue resection edge according to the condition that the sum of the thickness of the bone tissue resection edge and the thickness of the alveolar bone tissue at the position is 4mm, and assigning the thickness of the bone tissue resection edge to a bone tissue resection positioning part;
s7, in the reverse engineering software, an intermittent hole is arranged at the joint of the tooth surface attaching part and the bone tissue cutting positioning part to obtain the data of the dental crown lengthening surgery guide plate;
s8, importing the data of the dental crown lengthening operation guide plate into repair design software, and completing the dental crown lengthening operation guide plate through 3D printing;
the dental crown lengthening operation guide plate comprises a tooth surface attaching portion and a bone tissue cutting positioning portion, the upper edge of the tooth surface attaching portion is set to be a soft tissue cutting edge, the lower edge of the bone tissue cutting positioning portion is set to be a bone tissue cutting edge, the soft tissue cutting edge and the bone tissue cutting edge are enclosed to form a window opening portion, an intermittent hole is formed in the joint of the tooth surface attaching portion and the bone tissue cutting positioning portion, and the sum of the thickness of the bone tissue cutting edge and the thickness of an alveolar bone at the position is 4mm.
2. The method for manufacturing a crown lengthening guide according to claim 1, further comprising the steps of:
s6, arranging cavities distributed along the cut edge of the bone tissue at the position where the cut edge of the bone tissue is attached to the alveolar bone;
the bone tissue cutting edge of the bone tissue cutting positioning part of the dental crown lengthening operation guide plate is attached to the alveolar bone, and cavities distributed along the bone tissue cutting edge are arranged.
3. The method of manufacturing a crown lengthening guide according to claim 1 or 2, wherein the dentition scan data, the soft tissue guide data, the bone tissue guide data and the crown lengthening guide data are STL files.
4. The method of claim 1 or 2, wherein the dental crown lengthening guide is a 3shape dental system and the reverse engineering software is geogenic.
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| CN106901863A (en) * | 2017-02-23 | 2017-06-30 | 北京大学口腔医学院 | A kind of lengthening surgery guide plate and preparation method thereof |
| CN109662788A (en) * | 2019-01-15 | 2019-04-23 | 上海交通大学医学院附属第九人民医院 | A kind of impacted tooth individuation fenestration guide plate based on three-dimensional printing technology |
| CN112472204A (en) * | 2020-12-14 | 2021-03-12 | 哈尔滨医科大学附属第一医院 | Maxilla cuts bone baffle |
| CN113786262A (en) * | 2021-08-16 | 2021-12-14 | 合肥市口腔医院 | Preparation method of dental crown lengthening operation guide plate |
| CN114469394A (en) * | 2021-12-24 | 2022-05-13 | 京通奥瑟医疗科技(北京)有限公司 | Manufacturing method and system of personalized orthodontic bracket and integrated precise positioning guide plate |
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