A positioning and retaining system for maxilla segmental surgery and method of use

Abstract

The application discloses a positioning and holding system and a use method for maxillary bone block surgery, and belongs to the technical field of clinical medicine, and comprises a positioning guide plate, a personalized fixed titanium plate and special titanium nails; the positioning guide plate is composed of a guide plate body as a main structure, a connecting body located on the upper end surface of the guide plate body, a titanium nail just-in-place channel located on the side surface of the guide plate body and positioning bite plates located at both ends of the guide plate body; the personalized fixed titanium plate is composed of a titanium plate body, connecting grooves located on the side surface of the titanium plate body and nail holes located at both ends of the titanium plate body; the positioning bite plates are used for occlusion and positioning with the upper and lower tooth rows of a patient; the connecting body is in position correspondence with the connecting grooves and is buckled and connected; the titanium nail just-in-place channel is in position correspondence with the nail holes and is connected through special titanium nail screwing. The system of the application can hold the position of the maxillary bone, can not only reduce the generation of surgical errors, realize accurate positioning in the maxillary bone block surgery and avoid the problem of postoperative recurrence caused by the movement of the maxillary bone.

Description

Technical Field

[0001] This invention belongs to the field of clinical medical technology, specifically relating to a positioning and holding system and its method of use for maxillary bone segmentation surgery. Background Technology

[0002] Le Fort I osteotomy is one of the three classic surgical procedures in orthognathic surgery, used to correct deformities of the maxilla in the anterior-posterior, horizontal, and vertical directions. However, for patients with abnormal maxillary arch width, the conventional Le Fort I osteotomy cannot meet their treatment needs, thus requiring maxillary segmental surgery to address the problem of maxillary width abnormality. Conventional maxillary segmental surgeries include Y-shaped osteotomy, U-shaped osteotomy, and π-shaped osteotomy, each used to treat different types of maxillary width abnormalities.

[0003] Traditional maxillary segmental surgery uses plaster models for segment design, which is cumbersome, time-consuming, and inevitably prone to design errors, potentially failing to achieve the desired surgical outcome. Furthermore, clinical practice shows that even with orthodontic retainers to maintain maxillary arch width post-surgery, most patients still experience reduced posterior overbite and narrowing of the maxillary arch.

[0004] With the development of digital technology in the field of orthognathic surgery, and the widespread application of high-precision spiral CT, model scanning, and 3D printing technologies in clinical dentistry, preoperative design in orthognathic surgery is gradually shifting from traditional model-based surgery to digital surgical design. Therefore, it has become possible to address the issues of preoperative surgical design, intraoperative positioning, and postoperative retention in maxillary segmental surgery. Summary of the Invention

[0005] To address the problems of reduced posterior overjet and narrowed maxillary arch width in patients after maxillary segmental surgery in existing techniques, this invention provides a positioning and maintenance system and method for maxillary segmental surgery. This invention utilizes digital technology to design the maxillary segmental surgery plan preoperatively and employs 3D printing technology to fabricate a positioning guide and a personalized fixation titanium plate. During surgery, the positioning guide determines the spatial position of the maxillary bone segments, and once the personalized fixation titanium plate is moved to the target position, it is fixed to the maxillary bone segments using titanium screws. With precise surgical planning, the surgical plan can be accurately transferred to the surgical procedure and the stability of the maxillary bone position can be maintained postoperatively.

[0006] This invention is achieved through the following technical solution:

[0007] A positioning and retention system for maxillary segmentation surgery, comprising a positioning guide plate 1, a personalized fixed titanium plate 2 and special titanium screws 3; the positioning guide plate 1 consists of a guide plate body 4 serving as the main structure, a connector 5 located on the upper end surface of the guide plate body 4, a titanium screw placement channel 6 located on the side surface of the guide plate body 4, and positioning occlusal plates 7 located at both ends of the guide plate body 4; the personalized fixed titanium plate 2 consists of a titanium plate body 8, connecting grooves 9 located on the side surface of the titanium plate body 8, and screw holes 10 located at both ends of the titanium plate body 8; the positioning occlusal plates 7 are used for occluding and positioning with the maxillary and mandibular dentition of a patient; the connector 5 corresponds to the connecting groove 9 in position and is connected by clamping; the titanium screw placement channel 6 corresponds to the screw hole 10 in position and is connected by tightening with the special titanium screw 3.

[0008] Further, the positioning guide plate 1 is generally in a shape of several, which is adapted to the high-arched palate of the maxilla.

[0009] Further, the personalized fixed titanium plate 2 is n-shaped, which is used to fit closely with the palatal mucosa and minimize foreign body sensation in the oral cavity.

[0010] Further, the titanium screw placement channel 6 is used to control the angle and direction of the special titanium screw 3 entering the maxilla; the upper and lower surfaces of the positioning occlusal plate 7 are respectively made by profiling according to the upper and lower cusps of the patient, and are used for occluding and positioning with the maxillary and mandibular dentition of the patient.

[0011] Further, two screw holes 10 are respectively arranged at both ends of the titanium plate body 8, and the positions of the screw holes 10 are designed by using digital technology before the operation, so as to avoid the tooth roots; the angle of the screw holes 10 is not perpendicular to the personalized fixed titanium plate 2, and the angle is adjusted according to the position of the tooth roots before the operation, so as to avoid damaging the tooth roots.

[0012] Further, the special titanium screw 3 consists of a titanium screw body 13 and a titanium screw head 14; the end of the titanium screw body 13 is provided with a sharp self-tapping head 15, which is used to ensure that the special titanium screw 3 can enter the maxilla smoothly; the lower surface of the titanium screw body 13 is provided with titanium screw body threads 16, which are used to be tightly connected with the maxilla, and the upper surface of the titanium screw body 13 is provided with a smooth titanium screw body surface 17, which is used to limit the special titanium screw 3 from entering the maxilla too deeply and ensure minimal damage to the hard palatal mucosa.

[0013] Further, the circumferential surface of the titanium screw head 14 is provided with screw cap threads 18, which are used for matching connection with the screw hole nuts 11 in the screw holes 10; the top of the titanium screw head 14 is provided with a cross-shaped screw cap 19, which facilitates the self-tapping entry of the special titanium screw 3 into the maxilla and the removal thereof.

[0014] Further, the positioning guide plate 1 is made of photocurable resin by 3D printing technology, the personalized fixed titanium plate 2 is made of titanium metal by 3D printing technology, and the special titanium screw 3 is made of medical titanium metal.

[0015] Furthermore, the inner end face of the nail hole 10 is a nail hole nut 11, which is used to connect with the nail head thread 18 of the titanium nail head 14. The outer end face of the nail hole 10 is provided with a limiting hole 12, which is used to ensure that the special titanium nail 3 enters the maxilla to the required depth and prevents pressure damage to the hard palate mucosa.

[0016] Another object of the present invention is to provide a method for using a positioning and retention system for maxillary bone segmentation surgery, specifically including the following steps:

[0017] Step 1: First, based on the patient's three-dimensional reconstruction model of the maxilla and mandible, the maxillary bone segmentation surgery is designed. After the maxilla is segmented, a positioning guide plate 1 is designed, and a titanium screw placement path 6 is designed according to the position of the tooth roots in the maxillary bone model to control the angle and direction of the special titanium screw 3 on the maxilla. The upper and lower surfaces of the positioning occlusal plate 7 are designed according to the position of the segmented maxilla relative to the mandible. Then, a light-cured resin positioning guide plate 1 is prepared using 3D printing technology. Finally, a personalized fixation titanium plate 2 is designed based on the position of the segmented maxilla, and a personalized titanium metal fixation titanium plate 2 is prepared using 3D printing technology.

[0018] Step 2: Before the operation, after disinfecting the positioning guide plate 1 and sterilizing the personalized fixation titanium plate 2, the connector 5 on the positioning guide plate 1 and the connecting groove 9 on the personalized fixation titanium plate 2 are snapped together.

[0019] Step 3: During the operation, after the maxilla is divided into pieces according to the surgical steps, the positioning guide plate 1 is installed in the pre-designed position according to the position of the upper and lower surfaces of the positioning occlusal plate 7 corresponding to the position of the maxillary dentition. At this time, not only does the divided maxilla reach the pre-designed position, but the personalized fixation titanium plate 2 is also positioned in the pre-designed position.

[0020] Step 4: Control the angle and direction of the special titanium screw 3 into the maxilla according to the titanium screw placement path 6 on the side of the positioning guide plate 1. Under the premise of avoiding the tooth root, the special titanium screw 3 is successfully implanted into the corresponding position of the maxilla. At this time, the personalized fixation titanium plate 2 has been successfully fixed to the maxilla position designed before the operation according to the positioning guide plate 1.

[0021] Step 5: Remove positioning guide plate 1 to complete the positioning and fixation of the segmented maxilla.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] The present invention relates to a positioning and holding system and method for maxillary bone segmentation surgery. Firstly, it utilizes digital surgical technology for maxillary bone segmentation surgical design, avoiding the problems of complex, time-consuming, inefficient, and inaccurate traditional model-based surgical design processes. Secondly, the use of a positioning guide precisely transfers the preoperative design to the operating room, greatly improving surgical precision and ensuring the complete implementation of the preoperative design during the surgical procedure. Finally, the application of 3D-printed personalized fixation titanium plates not only fixes the segmented maxilla during surgery but also maintains it for six months, a year, or even longer postoperatively, preventing postoperative recurrence. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 : A three-dimensional structural schematic diagram of the positioning and retention system for maxillary bone segmentation surgery as described in Embodiment 1 of the present invention;

[0026] Figure 2 : A three-dimensional structural schematic diagram of the positioning guide plate of the positioning and holding system for maxillary bone segmentation surgery as described in Embodiment 1 of the present invention;

[0027] Figure 3 : A three-dimensional structural schematic diagram of the personalized fixation titanium plate for the positioning and retention system of the maxillary bone segmentation surgery described in Embodiment 1 of the present invention;

[0028] Figure 4 : A three-dimensional structural diagram of the special titanium screw for the positioning and retention system for maxillary bone segmentation surgery as described in Embodiment 1 of the present invention;

[0029] Figure 5 A front view of the positioning and holding system for maxillary bone segmentation surgery as described in Embodiment 1 of the present invention;

[0030] Figure 6 Side view of the positioning and holding system for maxillary bone segmentation surgery as described in Embodiment 1 of the present invention;

[0031] Figure 7 Top view of the positioning and holding system for maxillary bone segmentation surgery as described in Embodiment 1 of the present invention;

[0032] The names of the parts in the diagram are:

[0033] 1. Positioning guide plate; 2. Personalized fixing titanium plate; 3. Special titanium nail; 4. Guide plate body; 5. Connector; 6. Titanium nail positioning channel; 7. Positioning interlocking plate; 8. Titanium plate body; 9. Connecting groove; 10. Nail hole; 11. Nail hole nut; 12. Restriction hole; 13. Titanium nail body; 14. Titanium nail head; 15. Self-tapping head; 16. Titanium nail body thread; 17. Titanium nail body smooth surface; 18. Nail head thread; 19. "Cross flower" shaped nail head. Detailed Implementation

[0034] To clearly and completely describe the technical solution and its specific working process of the present invention, the specific embodiments of the present invention are as follows, in conjunction with the accompanying drawings:

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Example 1

[0039] like Figure 1As shown, the positioning and retention system for maxillary segmentation surgery described in this embodiment includes a positioning guide plate 1, a personalized fixation titanium plate 2 and dedicated titanium screws 3; the positioning guide plate 1 consists of a guide plate body 4 as the main structure, a connecting body 5 located on the upper end surface of the positioning guide plate 1, titanium screw placement channels 6 located on the side surface of the positioning guide plate 1, and positioning occlusal plates 7 located at both ends of the positioning guide plate 1; the personalized fixation titanium plate 2 consists of a titanium plate body 8, a connecting groove 9 located on the personalized fixation titanium plate 2, and four screw holes 10 located at both ends of the personalized fixation titanium plate 2; the dedicated titanium screw 3 consists of a titanium screw body 13 and a titanium screw head 14. The positioning guide plate 1 is engaged and positioned with the patient's upper and lower dentitions by means of the positioning occlusal plates 7 at both ends thereof; the positioning guide plate 1 and the personalized fixation titanium plate 2 are snap-connected by the connecting body 5 on the positioning guide plate 1 and the connecting groove 9 on the personalized fixation titanium plate 2; the dedicated titanium screw 3 and the personalized fixation titanium plate 2 are screwed and connected by the screw cap thread 18 at the top of the dedicated titanium screw 3 and the screw hole nut 11 on the personalized fixation titanium plate 2; the dedicated titanium screw 3 can enter the patient's maxilla by means of the self-tapping head 15 at its bottom, and then be fixed on the maxillary bone segment by means of the titanium screw body thread 16 on the titanium screw body 13.

[0040] As Figure 2 shown, in this embodiment, the positioning guide plate 1 is overall in a shape of "几", which is adapted to the high-arched palate of the maxilla; the positioning guide plate 1 controls the angle and direction of the dedicated titanium screw 3 entering the maxilla by means of the titanium screw placement channels 6 on its side surface; the upper and lower surfaces of the positioning occlusal plate 7 are respectively made by profiling according to the patient's upper and lower cusps, and the positioning guide plate 1 is engaged and positioned with the patient's upper and lower dentitions by means of the positioning occlusal plates 7 at both ends thereof.

[0041] In this embodiment, the positioning guide plate 1 and the personalized fixation titanium plate 2 are snap-connected by the connecting body 5 on the positioning guide plate 1 and the connecting groove 9 on the personalized fixation titanium plate 2.

[0042] As Figure 3 shown, in this embodiment, the personalized fixation titanium plate 2 is in a "n" shape, which is used to fit closely to the palatal mucosa and minimize the foreign body sensation in the oral cavity. Two screw holes 10 are respectively arranged at both ends of the personalized fixation titanium plate 2, and the positions of the screw holes 10 are designed by digital technology before surgery, aiming to avoid the tooth roots. In addition, the angle of the screw hole 10 is not perpendicular to the personalized fixation titanium plate 2, but the angle is adjusted according to the position of the tooth root before surgery to avoid damaging the tooth root. A screw hole nut 11 and a limiting small hole 12 are arranged inside the screw hole 10, the screw hole nut 11 is mutually adapted to the screw cap thread 18 at the top of the dedicated titanium screw 3. In addition, due to the design of the limiting small hole 12, it can ensure that the dedicated titanium screw 3 enters the maxilla to the proper depth and prevent compressive damage to the hard palatal mucosa.

[0043] As Figure 4As shown, in this embodiment, the design of the sharp self-tapping head 15 at the bottom of the dedicated titanium nail 3 is used to ensure that the dedicated titanium nail 3 can smoothly enter the maxilla. The lower surface of the titanium nail body 13 is provided with titanium nail body threads 16, which can enter the maxilla via the self-tapping head 15 and be tightly connected with the maxilla. The upper surface of the titanium nail body 13 is provided with a smooth titanium nail body surface 17, which is intended to limit the excessive penetration of the dedicated titanium nail 3 into the maxilla and ensure minimal damage to the hard palatal mucosa. The top of the dedicated titanium nail 3 is designed with a cross-shaped nail cap 19, which facilitates the self-tapping entry of the dedicated titanium nail 3 into the maxilla and its removal.

[0044] In this embodiment, the positioning guide plate 1 is made of photocurable resin using 3D printing technology, and the occlusal plate 7 is completely matched with the upper and lower dentition of the patient. The personalized fixed titanium plate 2 is made of titanium metal using 3D printing technology, and the dedicated titanium nail 3 is made of medical titanium metal. After successful fabrication, it has high hardness, strength and precision, which ensures stable and accurate contact with the dentition during intraoperative use, and accurately positions the segmented maxilla. After the segmented maxilla is positioned and fixed, the positioning guide plate 1 is removed. The main parts, the positioning guide plate 1 and the personalized fixed titanium plate 2, are customized for different patients and are for single use. As a medical consumable, the dedicated titanium nail 3 must also be for single use.

[0045] Embodiment 2

[0046] As shown Figures 5-7 , the dimensional parameters of the positioning and retention system for maxillary segmentation surgery of this embodiment are as follows:

[0047] The overall shape of the positioning guide plate 1 is a reversed-"U" shape with bent ends, with a total length of 63.0mm, a height of 26.5mm, a width of 7.0mm, and a thickness ranging from 1mm to 6mm; the inner diameter of the titanium nail placement channel 6 is 3.0mm; the positioning occlusal plate 7 has a thickness of 5.0-6.0mm, a width of 15.5-16.3mm, and a length of 17.8-21.5mm.

[0048] The overall length of the personalized fixed titanium plate 2 is 32.5mm, the height is 12.0mm, the width of the titanium plate body 8 is 7.0mm, the width of both ends is 11.0mm, the thickness of the titanium plate body 8 is 3.2mm, the thickness of both ends is 2.0mm, the thickness of the nail hole nut 11 is 1.5mm, and the thickness of the limiting small hole 12 is 0.5mm.

[0049] The total length of the dedicated titanium nail 3 is 8.0mm, the length of the nail cap thread 18 is 1.5mm, the length of the smooth titanium nail body surface 17 is 1.5mm, and the total length of the self-tapping head 15 and the titanium nail body thread 16 is 5.0mm. The diameter of the titanium nail body 13 is 1.6mm, and the diameter of the titanium nail head 14 is 3mm.

[0050] Embodiment 3

[0051] The method of using the positioning and retention system for maxillary bone segmentation surgery described in this embodiment includes the following steps:

[0052] Step 1: First, based on the patient's three-dimensional reconstruction model of the maxilla and mandible, a segmented maxillary bone surgery is designed. After segmenting the maxilla, a positioning guide plate 1 is designed, and titanium screw placement paths 6 are designed according to the position of the tooth roots in the maxillary bone model to control the angle and direction of the dedicated titanium screws 3 on the maxilla. The upper and lower surfaces of a positioning occlusal plate 7 are designed based on the position of the segmented maxilla relative to the mandible. Then, a light-cured resin positioning guide plate 1 is fabricated using 3D printing technology. Finally, a personalized fixation titanium plate 2 is designed based on the position of the segmented maxilla, and a personalized titanium fixation plate 2 is fabricated using 3D printing technology.

[0053] Step 2: Before the operation, after disinfecting the positioning guide plate 1 and sterilizing the personalized fixation titanium plate 2, the positioning guide plate 1 and the personalized fixation titanium plate 2 are connected by snap-fit ​​according to the connector 5 on the positioning guide plate 1 and the connecting groove 9 on the personalized fixation titanium plate 2.

[0054] Step 3: During the operation, after the maxilla is divided into pieces according to the surgical steps, the positioning guide plate 1 is installed in the pre-designed position according to the position of the upper and lower surfaces of the positioning occlusal plate 7 corresponding to the position of the maxillary dentition. At this time, not only does the divided maxilla reach the pre-designed position, but the personalized fixation titanium plate 2 is also positioned in the pre-designed position.

[0055] Step 4: Control the angle and direction of the special titanium screw 3 entering the maxilla according to the titanium screw placement path 6 on the side of the positioning guide 1, and successfully implant the special titanium screw 3 into the corresponding position of the maxilla while avoiding the tooth root. At this time, the personalized fixation titanium plate 2 has been successfully fixed to the pre-designed position of the maxilla according to the positioning guide 1;

[0056] Step 5: Remove positioning guide plate 1 to complete the positioning and fixation of the segmented maxilla.

[0057] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0059] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A positioning and holding system for maxillary bone segmentation surgery, characterized in that, comprising a positioning guide plate (1), a personalized fixed titanium plate (2) and special titanium nails (3); the positioning guide plate (1) consists of a guide plate body (4) as the main structure, a connecting body (5) located on the upper end face of the guide plate body (4), titanium nail placement channels (6) located on the side face of the guide plate body (4), and positioning occlusal plates (7) located at both ends of the guide plate body (4); the personalized fixed titanium plate (2) consists of a titanium plate body (8), connecting grooves (9) located on the side face of the titanium plate body (8), and nail holes (10) located at both ends of the titanium plate body (8); the positioning occlusal plates (7) are used to engage with the patient's upper and lower dentition for positioning; the connecting body (5) corresponds to the position of the connecting groove (9) and is connected by snap fit; the titanium nail placement channel (6) corresponds to the position of the nail hole (10) and is connected by tightening with the special titanium nail (3); The positioning guide plate (1) is overall in a "several" shape, which is adapted to the highly arched palate of the maxilla; The personalized fixed titanium plate (2) is in an "n" shape, which is used to fit closely against the palatal mucosa and minimize the foreign body sensation in the oral cavity; The titanium nail placement channel (6) is used to control the angle and direction of the special titanium nail (3) entering the maxilla; the upper and lower surfaces of the positioning occlusal plate (7) are respectively made by profiling according to the patient's upper and lower cusps, and are used to engage with the patient's upper and lower dentition for positioning; Two nail holes (10) are respectively arranged at both ends of the titanium plate body (8), and the positions of the nail holes (10) are designed using digital technology before surgery to avoid the tooth roots; the angle of the nail holes (10) is not perpendicular to the personalized fixed titanium plate (2), and the angle is adjusted according to the position of the tooth roots before surgery to avoid damaging the tooth roots; The inner end face of the nail hole (10) is a nail hole nut (11), which is used to cooperate and connect with the nail cap thread (18) of the titanium nail head (14); the outer end face of the nail hole (10) is provided with a limiting small hole (12), which is used to ensure that the special titanium nail (3) enters the maxilla to the proper depth and prevent compressive damage to the hard palatal mucosa; The special titanium nail (3) consists of a titanium nail body (13) and a titanium nail head (14); the end of the titanium nail body (13) is provided with a sharp self-tapping head (15), which is used to ensure that the special titanium nail (3) can enter the maxilla smoothly; the lower section surface of the titanium nail body (13) is provided with titanium nail body threads (16), which are used to closely connect with the maxilla; the upper section surface of the titanium nail body (13) is provided with a titanium nail body smooth surface (17), which is used to limit the special titanium nail (3) from entering the maxilla too deeply and ensure minimal damage to the hard palatal mucosa; The circumferential surface of the titanium nail head (14) is provided with nail cap threads (18), which are used to cooperate and connect with the nail hole nut (11) in the nail hole (10); the top of the titanium nail head (14) is provided with a cross-shaped nail cap (19), which facilitates the self-tapping entry and removal of the special titanium nail (3) from the maxilla; The positioning guide plate (1) is made of photocurable resin using 3D printing technology, the personalized fixed titanium plate (2) is made of titanium metal using 3D printing technology, and the special titanium nail (3) is made of medical titanium metal.

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