Tooth preparation intraoral scanning auxiliary device and use method thereof
By designing an intraoral scanning auxiliary device for tooth preparation, the device uses a cap-shaped part and an expansion part to mechanically push open the gingiva. Combined with ventilation, water ventilation, light penetration cleaning, and laser hemostasis, it solves the accuracy problem of traditional scanning devices in complex oral environments, realizes high-precision three-dimensional data acquisition, and provides reliable data for restoration design.
Patent Information
- Application Number
- CN202511637496.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2025-12-23
AI Technical Summary
Traditional intraoral scanning devices struggle to achieve accurate scanning in complex oral environments, especially when there are excessively narrowed undercuts in prepared teeth or adjacent teeth, small patient openings, or factors such as saliva, gingival crevicular fluid, or gingival retraction paste near the gums. As a result, the scanning accuracy is low and the error is large, making it unsuitable as reference data for restoration fabrication.
Design an intraoral scanning auxiliary device for tooth preparation. The scanning head unfolds to form a cap-shaped part and an expansion part, combined with air holes, water holes, and light holes. It mechanically pushes open the gums, cleans saliva and blood near the termination line, and uses a laser to increase brightness to ensure that the scanning head collects clear three-dimensional data.
To reduce patient discomfort, improve scanning accuracy, and obtain three-dimensional scanning data with minimal error compared to actual tooth data, which can be used for the precise design and fabrication of restorations.
Smart Images
Figure CN121177041A_ABST
Abstract
Description
Technical Field
[0001] This invention specifically relates to an intraoral scanning auxiliary device for tooth preparation and its method of use. Background Technology
[0002] Tooth preparation is a crucial step in dental restoration treatment, aiming to ensure the fit, aesthetics, and functionality of the restoration to the tooth. In recent years, with the rapid development of digital technology in the field of oral medicine, intraoral scanners have become an important force driving the industry's development. Their use in dental restoration is becoming increasingly frequent, making them an important instrument in dental restoration treatment. However, compared with traditional impression acquisition methods, although intraoral scanners have lower sensitivity and can obtain higher accuracy, improving patient comfort, their accuracy is easily affected by the limitations of optical scanning technology itself and various factors within the patient's oral cavity. Among these factors, the surface geometry of the restoration and the position of its termination line have a crucial impact on the accuracy of the intraoral scanner. Specifically, the position of the prepared dental restoration within the dental arch, as well as any sharp edges, unevenness, or roughness, will reduce scanning accuracy. Generally, this is addressed by using a smaller scanning head and adjusting the angle multiple times to scan as much of the blind area as possible. Simultaneously, the position of the termination line of the prepared tooth in the crown-root direction also significantly affects the scanning accuracy. Methods such as air gun drying and gingival retraction are typically used to preserve the gingival termination line as much as possible to improve scanning accuracy. However, when traditional intraoral scanning devices obtain intraoral scanning data using the above methods, it is often difficult to achieve accurate scanning when the prepared tooth or adjacent teeth have excessively narrowed undercuts, or when the patient's mouth is too small. At the same time, saliva, gingival crevicular fluid, gingival retraction cord, or residual gingival retraction paste near the gums can reduce the accuracy of the scanning, resulting in a large error between the obtained scanning data and the patient's actual tooth data, making it unsuitable as reference data for the fabrication of restorations.
[0003] Therefore, it is necessary to invent an intraoral scanning auxiliary device for tooth preparation and its usage method to solve the above problems. Summary of the Invention
[0004] (a) Purpose of the invention The purpose of this invention is to provide an intraoral scanning auxiliary device for tooth preparation and its usage method. The scanning head unfolds downwards to form a cap-shaped portion, which further unfolds downwards to form an expansion portion. This eliminates the need for excessive mouth opening by the patient, reducing discomfort. With the help of ventilation holes, water holes, and light holes, the entire outer surface of the tooth remains clean and unobstructed, with sufficient brightness. The scanning head can acquire three-dimensional scanning data of the tooth preparation with a clear termination line. Furthermore, the unfolded scanning head wraps around the outer surface of the tooth, allowing the scanning head to fully acquire the three-dimensional morphology of the proximal end below the tooth's highest point, better guiding the design and fabrication of proximal ...
[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an intraoral scanning auxiliary device for tooth preparation, comprising a sleeve, the sleeve being L-shaped, and a reflector installed inside the bend of the sleeve to guide light through the scanning head; A scanning head is connected to the bottom opening of the sleeve. A first condenser lens is installed at the connection between the scanning head and the sleeve, and a second condenser lens is installed at the bottom opening of the scanning head to increase the light intensity so that it illuminates the tooth. A cap-shaped portion, formed by the scanning head unfolding towards the bottom, is used to wrap around the prepared body or tooth body; The pipeline assembly is located inside the cap-shaped part, and is arranged from the inside to the outside as an air passage, a water passage, and an optical passage. The expansion section, connected to the bottom of the cap-shaped section, can expand outward again based on the cap-shaped section, and is used to push the gingiva to move outward toward the termination line; The perforation assembly is formed on the side wall of the expansion section, and is arranged from top to bottom as a vent hole, a water hole, and a light hole.
[0006] Preferably, a button is provided at the top of the sleeve.
[0007] Preferably, the scanning head is configured as a telescopic miniature scanning head, which is malleable and covered with a high-brightness reflective material to focus light to the termination line and shield interference from surrounding irrelevant anatomical structures.
[0008] Preferably, the vent is connected to the air passage and is used to dry the water vapor near the termination line and to absorb residual saliva and blood; The water inlet is connected to the water channel and is used to rinse blood and gum-draining ointment near the termination line. The light-transmitting hole is connected to the optical path channel and is used for laser hemostasis or to increase the brightness near the termination line.
[0009] A method for using an intraoral scanning aid for tooth preparation includes the following steps: S1. Covering the tooth body: The medical staff first use a conventional scanning head to scan and obtain three-dimensional data of the patient's teeth and gums. Then, the pneumatic button controls the scanning head of the intraoral scanning auxiliary device to unfold around the tooth body, so that the tooth body is covered by the cap-shaped part. At the same time, the expansion part is controlled to unfold, so as to mechanically push the gums to move outward towards the termination line. S2. Tooth cleaning: Through the cooperation of the tubing and hole components, air can freely enter the ventilation hole through the air passage, thereby blowing away the water vapor near the termination line and absorbing the residual saliva and blood. Meanwhile, distilled water enters the water hole through the water passage, and then rinses away the blood and gingival retraction paste near the termination line. At the same time, the external laser device emits a laser into the light path channel, which is then guided to the gingival end through the light hole. The laser stops the bleeding and increases the brightness near the termination line. S3. Scanning the prepared body: The prepared tooth is scanned directly using the unfolded scanning head to obtain clear three-dimensional data of the tooth at the termination line position. This data is then fused with the conventional morphological three-dimensional data to form target data that includes clear termination line, prepared body data, and gingival morphological data.
[0010] Compared with the prior art, the beneficial effects of the above-mentioned technical solution of the present invention are: This invention utilizes a scanning head that unfolds downwards to form a cap-shaped portion, which further unfolds downwards to form an expansion portion. This mechanically pushes the gingiva aside, covering the outer side of the tooth without requiring excessive mouth opening from the patient, reducing discomfort. With the help of ventilation, water, and light-transmitting holes, the entire outer side of the tooth remains clean and unobstructed, with ample brightness. The scanning head can acquire clear 3D scan data of the prepared tooth with a defined termination line. After fusion with conventional data, the resulting data on the patient's tooth structure shows minimal error compared to actual tooth structure data and can be used as reference data for restoration fabrication. Furthermore, the unfolded scanning head, wrapping around the outer side of the tooth, allows for comprehensive acquisition of the 3D morphology of the proximal gingival end below the tooth's highest point, better guiding the design and fabrication of the proximal morphology of the restoration. This scanning aid is suitable for complex restoration surface geometry features and can accurately acquire satisfactory optical impressions, laying a solid foundation for subsequent restoration design and fabrication. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.
[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a demonstration diagram showing the use of this invention.
[0013] Explanation of reference numerals in the attached figures: 1. Sleeve, 2. Reflector, 3. Scanning head, 4. First condenser lens, 5. Second condenser lens, 6. Cap-shaped part, 71. Air passage, 72. Water passage, 73. Optical passage; 8. Expansion section; 91. Vent hole; 92. Water passage hole; 93. Light passage hole; 10 buttons. Detailed Implementation
[0014] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
[0015] This invention provides, for example Figure 1-2 The tooth preparation intraoral scanning auxiliary device shown includes a sleeve 1, which is L-shaped. A reflector 2 is installed inside the bend of the sleeve 1 to guide light through the scanning head 3. The scanning head 3 is connected to the bottom opening of the sleeve 1. A first condenser lens 4 is installed at the connection between the scanning head 3 and the sleeve 1. A second condenser lens 5 is installed at the bottom opening of the scanning head 3 to increase the light intensity so that it shines on the tooth. The cap-shaped portion 6 is formed by the scanning head 3 expanding outwards to the bottom, and is used to wrap around the prepared body or tooth body; The pipeline assembly 7 is disposed inside the cap-shaped part 6, and is arranged from the inside to the outside as an air passage 71, a water passage 72, and an optical passage 73; The expansion portion 8 is connected to the bottom of the cap-shaped portion 6 and can expand outward again based on the cap-shaped portion 6 to push the gingiva to move outward toward the termination line; The perforation assembly is formed on the side wall of the expansion part 8, and is arranged from top to bottom as a vent hole 91, a water hole 92, and a light hole 93.
[0016] In one embodiment, the top of the sleeve 1 is provided with a button 10, which controls the scanning head 3 to unfold toward the preparation body to form a cap-shaped part 6, and further controls the cap-shaped part 6 to unfold to form an expansion part 8, so as to achieve the purpose of more fully exposing the termination line.
[0017] In one embodiment, the scanning head 3 is configured as a telescopic miniature scanning head 3, model PANDA P3 oral 3D scanner, which is malleable and covered with a high-brightness reflective material to focus light to the termination line and shield interference from surrounding irrelevant anatomical structures, ensuring that the scanning head 3 obtains accurate tooth data.
[0018] In one embodiment, the vent 91 is connected to the air passage 71 to dry the moisture near the termination line and to absorb residual saliva and blood, ensuring that there is no liquid residue at the gum line. The water passage 92 is connected to the water channel 72 and is used to rinse the blood and gingival dressing near the termination line, so that sterile distilled water can directly rinse the area near the termination line. The light-transmitting aperture 93 is connected to the optical path channel 73 and is used for laser hemostasis or to increase the brightness near the termination line, laying the foundation for accurate scanning of the termination line.
[0019] A method for using an intraoral scanning aid for tooth preparation includes the following steps: S1. Covering the tooth body: The medical staff first use the conventional scanning head 3 to scan and obtain the conventional three-dimensional data of the patient's tooth body and gums. Then, the pneumatic button 10 controls the scanning head 3 of the intraoral scanning auxiliary device for tooth preparation to unfold and expand around the tooth body, so that the tooth body is surrounded by the cap-shaped part 6. At the same time, the expansion part 8 is controlled to unfold to mechanically push the gums to move towards the outside of the termination line. S2. Cleaning the tooth: Through the cooperation of the tubing assembly 7 and the hole assembly, air can freely enter the ventilation hole 91 through the air passage 71, thereby blowing away the water vapor near the termination line and absorbing the residual saliva and blood. Meanwhile, distilled water enters the water hole 92 through the water passage 72, and then rinses away the blood and gingival retraction paste near the termination line. At the same time, the external laser device emits a laser into the light path 73, and the laser is guided to the gingival end through the light path 73 and the light hole 93. The laser stops the bleeding and increases the brightness near the termination line. S3, Scanning the prepared body: The unfolded scanning head 3 is used directly to scan the cleaned tooth body to obtain clear three-dimensional data of the tooth body at the termination line position, and is fused with the conventional three-dimensional morphological data to form target data containing clear termination line, prepared body data and gingival morphological data.
[0020] In summary In use, the scanning head 3 unfolds downwards to form a cap-shaped portion 6, which in turn unfolds downwards to form an expansion portion 8. This mechanically pushes the gingiva aside, covering the outer side of the tooth, reducing patient discomfort by eliminating the need for excessive mouth opening. Air reaches the vent 91 to blow away moisture near the termination line and absorb residual saliva and blood. Furthermore, sterile distilled water flows through the water vent 92 to rinse away blood and gingival retraction paste near the termination line. Additionally, a laser passes through the light vent 93 at the gingival end, stopping bleeding while increasing brightness near the termination line. This ensures the entire outer side of the tooth is clean and unobstructed with sufficient brightness, allowing the scanning head 3 to acquire a clear 3D scan of the prepared tooth with a defined termination line. According to reports, by integrating with conventional tooth and gingival morphology, three-dimensional morphological data of the tooth and normal gingival morphology with clear termination lines are obtained. The error with the actual tooth data of the patient is small, and it can be used as reference data for the fabrication of restorations. At the same time, by wrapping the outer side of the tooth with the unfolded cap-shaped part 6 and the expansion part 8, the scanning terminal can be applied to the acquisition of the tooth morphology of adjacent teeth with large undercuts near the gingiva. It can fully acquire the three-dimensional morphology of the near gingiva below the high point of the tooth outline, thereby better guiding the design and fabrication of the adjacent morphology of the restoration. This scanning auxiliary device can be applied to the surface geometry of complex restorations and can accurately acquire satisfactory optical impressions, laying a solid foundation for the subsequent design and fabrication of restorations. This embodiment specifically addresses the problem that in the prior art, when traditional intraoral scanning devices obtain intraoral scanning data using the above method, it is often difficult to achieve accurate scanning when the prepared tooth or adjacent teeth have excessively narrowed undercuts, or when the patient's mouth opening is too small. At the same time, saliva, gingival crevicular fluid, gingival retraction cord, or residual gingival retraction paste near the gum line can reduce the accuracy of the scanning, resulting in a large error between the obtained scanning data and the patient's actual tooth data, making it unsuitable as reference data for the fabrication of restorations.
[0021] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. An intraoral scanning auxiliary device for tooth preparation, characterized in that, include: The sleeve (1) is L-shaped and a reflector (2) is installed inside the bend of the sleeve (1) to guide light through the scanning head (3). The scanning head (3) is connected to the bottom opening of the sleeve (1). A first condenser lens (4) is installed at the connection between the scanning head (3) and the sleeve (1). A second condenser lens (5) is installed at the bottom opening of the scanning head (3) to increase the light intensity so that it shines on the tooth. A cap-shaped portion (6) is formed by the scanning head (3) unfolding towards the bottom, and is used to wrap around the prepared body or tooth body; The pipeline assembly (7) is located inside the cap-shaped part (6) and is arranged from the inside to the outside as an air passage (71), a water passage (72), and an optical passage (73). The expansion portion (8) is connected to the bottom of the cap-shaped portion (6) and can expand outward again based on the cap-shaped portion (6) to push the gingiva to move outward toward the termination line; The hole assembly is formed on the side wall of the expansion part (8), and is arranged from top to bottom as a ventilation hole (91), a water hole (92), and a light hole (93).
2. The intraoral scanning auxiliary device for tooth preparation according to claim 1, characterized in that: A button (10) is provided on the top of the sleeve (1).
3. The intraoral scanning auxiliary device for tooth preparation according to claim 1, characterized in that: The scanning head (3) is configured as a telescopic micro scanning head (3), which is malleable and covered with a high-brightness reflective material to focus light to the termination line and shield the interference of surrounding irrelevant anatomical structures.
4. The intraoral scanning auxiliary device for tooth preparation according to claim 1, characterized in that: The vent (91) is connected to the air passage (71) and is used to dry the water vapor near the termination line and to absorb residual saliva and blood. The water passage (92) is connected to the water channel (72) and is used to rinse the blood and gingival ointment near the termination line; The light-transmitting hole (93) is connected to the optical path channel (73) and is used for laser hemostasis or to increase the brightness near the termination line.
5. A method of using the intraoral scanning auxiliary device for tooth preparation according to any one of claims 1-4, characterized in that: Includes the following steps: S1, Covering the tooth body: The medical staff first use the conventional scanning head (3) to scan and obtain the conventional three-dimensional data of the patient's tooth body and gingiva. Then, the pneumatic button (10) controls the scanning head (3) of the intraoral scanning auxiliary device for tooth preparation to unfold and unfold around the tooth body, so that the tooth body is covered by the cap-shaped part (6). At the same time, the expansion part (8) is controlled to unfold to mechanically push the gingiva to move towards the outside of the termination line. S2. Cleaning the tooth: Through the cooperation of the tubing assembly (7) and the hole assembly, air can freely enter the ventilation hole (91) through the air passage (71), thereby blowing away the water vapor near the termination line and absorbing the residual saliva and blood. Sterile distilled water enters the water hole (92) through the water passage (72), and then rinses away the blood and gingival slurry near the termination line. At the same time, the external laser device emits a laser into the light passage (73), and the laser is guided to the gingival end through the light hole (93) from the light passage (73). The laser stops the bleeding and increases the brightness near the termination line. S3, Scanning the prepared body: The cleaned tooth body is scanned directly using the unfolded scanning head (3) to obtain clear three-dimensional data of the tooth body at the termination line position, and is fused with the conventional three-dimensional data of the morphology to form target data containing clear termination line, prepared body data and gingival morphology data.