An artificial crown for maxillary molars

Abstract

The present invention discloses an artificial crown for maxillary molars, the crown comprising a co-crown restoration, the gingival end of the co-crown restoration being provided with a drainage channel, the drainage channel being used for cleaning the gingival end of the co-crown restoration; in a state of use, a channel is formed between the drainage channel and the gums, both ends of which are connected to the oral cavity. The drainage channel is preferably in a mesiodistal direction; in a state of use, the drainage channel is located between the palatal root and the mesiodistal buccal root, and the proximal and distal ends of the drainage channel are both biased toward the palate. The artificial crown for maxillary molars of the present invention is designed with a drainage channel at the gingival end, which is beneficial to the self-cleaning of teeth, can remove hidden plaque and tartar, control periodontitis, prevent root caries, and improve the long-term efficacy of co-crown restoration after maxillary molar root separation surgery.

Description

Technical Field

[0001] The invention relates to the field of medical technology, and in particular to an artificial crown for maxillary molars. Background Art

[0002] Mandibular molar root separation is used to treat grade III or IV root bifurcation lesions and fractured teeth. It involves splitting the crown and root of the mandibular molar along the buccolingual groove to form two independent roots. After scraping away the tartar and granulation tissue in the root bifurcation area, or after root canal treatment, the two "single-root teeth" are repaired with a post, core, and crown to evenly distribute the chewing force and fully mobilize the potential of the periodontal tissue. Root separation exposes the diseased tissue, making it easier to completely remove pathogenic irritants, eliminate periodontal pockets, and promote the attachment of healthy periodontal tissues. It not only avoids disuse alveolar bone atrophy after root extraction, but also retains the sensory function of the root periodontal membrane. Therefore, it is widely used clinically.

[0003] However, root separation surgery is currently mostly used for mandibular molars, while the long-term effect of root separation surgery on maxillary molars is not good and it is rarely used clinically. The reason is that maxillary molars have three roots arranged in a triangle, and the distance between the roots is small. After root separation surgery, food residues are easily accumulated at the gingival end of the restoration, aggravating plaque adhesion and tartar formation. The self-cleaning effect of this area is poor, and the gap is too small, making it difficult to clean and maintain, which eventually leads to root caries, deepening of periodontal pockets, and even crown loss.

[0004] Maxillary molar hemisection is the removal of the buccal root, leaving only the palatal root, which is at an angle to the long axis of the tooth, converting the occlusal force into lateral force, increasing the burden on the single root and resulting in poor long-term results. Summary of the invention

[0005] The purpose of the present invention is to provide an artificial crown for maxillary molars to solve the problem that the gingival end of the joint crown restoration after maxillary molar root separation surgery is difficult to clean and the long-term treatment effect is poor.

[0006] In order to achieve the above-mentioned purpose, the present invention provides an artificial crown for maxillary molars, which comprises a linked crown restoration, and the gingival end of the linked crown restoration is provided with a drainage channel, and the drainage channel is used to clean the gingival end of the linked crown restoration; when in use, a channel is formed between the drainage channel and the gums, and both ends of the channel are connected to the oral cavity.

[0007] Preferably, the overflow channel is mesiodistal; in use, the overflow channel is located between the palatal tooth root and the mesiodistal buccal root, and the proximal and distal ends of the overflow channel are both biased toward the palatal side.

[0008] Preferably, the overflow channel is 7-8 mm long, 1.5-2 mm wide, and 1.5-2 mm high.

[0009] Preferably, the joint crown restoration is provided with a buccal groove and a palatal groove on both sides of the overflow channel, respectively, for mounting the joint crown restoration on the abutment tooth after tooth preparation.

[0010] Preferably, a tooth cleaning tool is used to clean the overflow channel, and the tooth cleaning tool includes an irrigator and an interdental brush.

[0011] Preferably, the artificial crown is an artificial crown used after root separation surgery of maxillary molars.

[0012] Preferably, the artificial crown is an artificial crown used in the treatment of furcation lesions, fractured teeth and caries.

[0013] Beneficial effects:

[0014] (1) The gingival end of the crown restoration is designed with an overflow channel, which is conducive to self-cleaning of the teeth. The area can be kept clean with an irrigator or interdental brush to remove hidden plaque and tartar, control periodontitis, prevent root caries, and improve the long-term efficacy of the crown restoration after root separation surgery for maxillary molars.

[0015] (2) The overflow channel is designed in the mesiodistal direction rather than the buccolingual direction between the mesiodistal buccal roots, thus avoiding direct exposure of the channel on the buccal and palatal sides that would affect the aesthetics.

[0016] (3) The overflow channel is located on the palatal side rather than the buccal side, which can facilitate the patient's subsequent cleaning.

[0017] (4) Compared with maxillary molar hemisection, the artificial crown of the present invention can retain the buccal root, increase the area of ​​the periodontal membrane, and help share the occlusal force to avoid excessive burden on a single root.

[0018] (5) The use of the artificial crown of the present invention in combination with maxillary molar root separation surgery retains the oral physiological discrimination ability, distinguishes the hardness of food, perceives the magnitude and direction of chewing force, reduces jaw trauma, and prevents alveolar bone absorption.

[0019] (6) The artificial crown of the present invention is used in combination with maxillary molar root separation surgery, so there is no need to extract the tooth, thus avoiding disuse atrophy of the alveolar bone after tooth extraction.

[0020] (7) For patients who suffer from systemic diseases such as heart disease and hypertension and are not suitable for dental implant surgery, the design of the present invention can improve the long-term treatment effect of the joint crown restoration and restore the patient's chewing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Flow chart of root division.

[0022] Figure 2 Schematic diagram of the cleaning principle of the overflow channel.

[0023] Figure 3a and Figure 3b The figure is a physical picture of an artificial crown for maxillary molars according to one embodiment. Figure 3a The artificial crown is inverted. Figure 3b The artificial crown is placed correctly. Figure 3a and Figure 3b All artificial crowns are placed on the reflector.

[0024] Figure 4a This is a clinical picture of a maxillary molar before crowning after root division surgery in an embodiment. Figure 4b This is a clinical picture of a maxillary molar 8 months after root division and crowning in one embodiment. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Explanation of terms

[0027] (1) Crown: The part of the tooth that is exposed in the mouth.

[0028] (2) Artificial crowns, also called dental caps, are a method used to repair teeth. When a tooth is damaged and difficult to repair by filling, an artificial crown can be made of different materials and placed on the reduced natural crown.

[0029] (3) Root: The part of the tooth buried in the alveolar bone.

[0030] (4) Abutment tooth: The tooth remaining after a part of the natural tooth is ground off and used to install the artificial crown.

[0031] (5) Tooth preparation: The full name is tooth preparation, commonly known as molars, which refers to the surgical treatment process of natural teeth before installing artificial crowns.

[0032] (6) Mesial / distal: Teeth are mesial if they are closer to the midline, and distal if they are farther away. The midline is an imaginary vertical line that divides the craniofacial area into two equal parts. The midline passes between the left and right eyes, the tip of the nose, and the contact area between the left and right central incisors.

[0033] (7) Palatal root / mesiodistal buccal root: The maxillary molars have three roots, namely the mesiobuccal root, the distobuccal root and the palatal root; the palatal root is the palatal root, and the mesiobuccal root is the mesiobuccal root and the distobuccal root.

[0034] (8) Palate / Cheek: The front wall of the oral cavity is the upper and lower lips, the side walls are the cheeks, the upper wall is the palate, and the lower wall is the floor of the mouth.

[0035] (9) Gingival end: the end close to the gums.

[0036] The present invention provides an artificial crown for a maxillary molar, the crown comprising a joint crown restoration. The gingival end of the joint crown restoration is provided with a drainage channel, and in a use state, a channel is formed between the drainage channel and the gums, both ends of which are connected to the oral cavity. The design of the drainage channel is conducive to self-cleaning of teeth, and a water flosser or an interdental brush can be used to maintain the cleaning of the part, remove hidden plaque and tartar, control periodontitis, prevent root caries, and improve the long-term efficacy of the joint crown restoration after maxillary molar root division surgery.

[0037] The overflow channel is preferably in the mesiodistal direction; in the use state, the overflow channel is located between the palatal tooth root and the mesiodistal buccal root, and the proximal and distal ends of the overflow channel are both biased toward the palate. The overflow channel adopts the mesiodistal direction rather than the buccolingual design between the mesiodistal buccal roots, avoiding the buccal exposure channel affecting the aesthetics; biased toward the palate rather than the buccal side can provide convenience for the patient's later cleaning.

[0038] The artificial crown of the present invention can be used for maxillary molar root division. Figure 1 As shown, it is a flow chart of root division surgery. In S2, the crown and root of the maxillary molar of S1 are cut off to separate it into two halves, the buccal side and the palatal side, as shown in S3, wherein the buccal side includes the mesiodistal buccal root, i.e. the mesiobuccal root and the distal buccal root, and the palatal side includes the palatal root. After the tooth is prepared, two independent abutment teeth similar to single-rooted teeth are formed as shown in S4. The joint crown restoration of the artificial crown of the present invention is provided with buccal grooves and palatal grooves on both sides of the overflow channel, respectively, for installing the joint crown restoration on the abutment tooth after tooth preparation. In S5, the dentin and cementum parts exposed after cutting can be covered with the artificial crown of the present invention, the buccal groove is installed on the buccal root, and the palatal groove is installed on the palatal root. The buccal groove part and the palatal groove part are two single crowns. The artificial crown of the present invention includes the buccal groove part and the palatal groove part, and therefore is a joint crown restoration.

[0039] like Figure 2 The figure shows a schematic diagram of the cleaning principle of the overflow channel 11. Between teeth 2 and 3 is the maxillary molar 1, and the overflow channel 11 is located at the gingival end of the artificial crown, that is, the overflow channel 11 is a channel between the artificial crown and the gum. After the maxillary molar undergoes root division surgery, the gingival end of the restoration is prone to accumulation of food debris, so it is necessary to design the overflow channel 11. The overflow channel 11 is located between the palatal root 12 and the mesiodistal buccal root 13, extending from the mesial direction to the distal direction, and both ends of the overflow channel 11 are biased toward the palatal side. The overflow channel 11 adopts a mesiodistal direction rather than a buccolingual design between the mesiodistal buccal roots, which avoids direct exposure of the channel on the buccal and palatal sides to affect the aesthetics; it is biased toward the palatal side rather than the buccal side, so that the overflow channel 11 can be cleaned from the palatal side, which provides convenience for the patient's later cleaning. An irrigator or interdental brush can be used along the Figure 2 The direction indicated by the middle arrow maintains the cleanliness of the overflow channel 11.

[0040] In some embodiments, the overflow channel is 7-8 mm long, 1.5-2 mm wide, and 1.5-2 mm high.

[0041] like Figure 3a and Figure 3b Shown is a physical picture of an artificial crown for maxillary molars according to an embodiment. Figure 3a The artificial crown is inverted. Figure 3b The artificial crown is placed correctly. Figure 3a and Figure 3b The artificial crowns are placed on a reflector to show the other side of the artificial crown.

[0042] The present invention is applicable to: (1) patients with no obvious loosening of the root of the affected tooth and sufficient bone support around it. (2) patients with grade III or IV root bifurcation lesions and local deep periodontal pockets that cannot be eliminated. (3) patients with contraindications to dental implants. (4) people who can take care of themselves.

[0043] like Figure 4a and Figure 4b The figure shows clinical pictures of maxillary molar root separation surgery before and 8 months after crowning in one embodiment. The clinical results show that the artificial crown for maxillary molars of the present invention is conducive to self-cleaning of teeth by designing overflow channels at the gingival end, can remove hidden plaque and tartar, control periodontitis, prevent root caries, and improve the long-term efficacy of joint crown restoration after maxillary molar root separation surgery.

[0044] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. An artificial crown for maxillary molars, characterized in that: The dental crown comprises a linked crown restoration, wherein the gingival end of the linked crown restoration is provided with a drainage channel, and the drainage channel is used to clean the gingival end of the linked crown restoration; in a state of use, a channel is formed between the drainage channel and the gums, both ends of which are connected to the oral cavity; the drainage channel is in a mesiodistal direction; in a state of use, the drainage channel is located between the palatal tooth root and the mesiodistal buccal root, and the proximal end and the distal end of the drainage channel are both biased toward the palatal side.

2. The artificial crown for maxillary molars according to claim 1, characterized in that: The overflow channel is 7-8 mm long, 1.5-2 mm wide and 1.5-2 mm high.

3. The artificial crown for maxillary molars according to claim 1, characterized in that: The joint crown restoration is provided with a buccal groove and a palatal groove on both sides of the overflow channel, respectively, for installing the joint crown restoration on the abutment tooth after tooth preparation.

4. The artificial crown for maxillary molars according to claim 1, characterized in that: The overflow channel is cleaned by a tooth cleaning tool, wherein the tooth cleaning tool comprises a water flosser and an interdental brush.

5. The artificial crown for maxillary molars according to claim 1, characterized in that: The artificial crown is an artificial crown used after the maxillary molar undergoes root separation surgery.

6. The artificial crown for maxillary molars according to claim 1, characterized in that: The artificial crown is an artificial crown used in the treatment of furcation lesions, fractured teeth and caries.

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