888 results about "Dental Gingiva" patented technology

The invention provides an intelligent toothbrush based on AI visual identification and an oral health assessment method, and relates to the technical field of artificial intelligence and computer vision. The intelligent toothbrush based on AI visual identification and the oral health assessment method comprise the following steps: S1, based on a built-in multispectral camera of the intelligent toothbrush, dynamically adjusting illumination parameters of different oral regions by adopting a visible light and near-infrared bimodal synchronous acquisition algorithm and through a self-adaptive exposure compensation technology, high-resolution images and transmission data of tooth surfaces and gingival lines are obtained, and a multi-mode oral cavity image data set is generated. Illumination parameters are dynamically adjusted through a multispectral camera to obtain high-resolution bimodal data, the focus detection precision is improved in combination with cross-modal feature fusion, the problem that traditional single-modal imaging is insufficient in early-stage dental caries recognition is solved, and the accuracy of early-stage dental caries recognition is improved based on laser radar point cloud complementation and a three-dimensional surface reconstruction technology. And mapping the two-dimensional focus label into a dynamic three-dimensional plaque distribution model.

The invention discloses a tooth intelligent segmentation and parameterized bionic reconstruction method fusing multi-modal data, and belongs to the field of artificial intelligence and computer-aided biomedical engineering. The method comprises a CBCT intelligent segmentation module, an intraoral scanning intelligent segmentation module, an internal tissue segmentation module, a point cloud generation registration module and a parameterized bionic reconstruction module. The point cloud generation registration module further comprises a point cloud generation sub-module and a point cloud registration sub-module; the parameterized bionic reconstruction module further comprises a dentin reconstruction sub-module, a cancellous bone reconstruction sub-module and a gingival reconstruction sub-module. The invention aims to realize tooth semantic segmentation, point cloud reconstruction and parameterized bionic modeling of an organization structure under cross-modal data fusion, and provides high-precision bionic internal structure information for teeth in combination with an artificial intelligence model and parameterized modeling.

The invention relates to the technical field of oral implantation monitoring, and discloses a monitoring method for analyzing oral implantation health based on using images. The method comprises the following steps: acquiring an optical image data sequence of an oral implanting region by adopting optical scanning equipment, constructing a three-dimensional oral tissue model containing gingival contour features and an implant position, and identifying actual position distribution information of an implant in gingival tissue; and extracting an implant health index set comprising an implant marginal definition value, a surrounding gingival red and swollen area proportion and a gingival atrophy degree value. When any index exceeds a preset health threshold interval, abnormal early warning information is generated, scanning parameters are dynamically adjusted, and images are collected again for iterative monitoring. According to the method, dynamic and accurate monitoring of oral implant health can be realized, health abnormity of the implant can be found in time, and support is provided for long-term health maintenance of the implant.

The invention discloses an oral care desensitization paste and a preparation method thereof, and mainly relates to the technical field of dental medicines. The oral care desensitization cream is prepared from the following components: bioactive glass, strontium chloride, sodium chloride, silicon dioxide, sodium carboxymethyl cellulose, polyethylene glycol 400, a xanthan gum solution, sodium lauryl sulfate, sodium lauroyl sarcosinate, titanium dioxide, beta-glucan, saccharin sodium salt, sorbitol, methylparaben, propyl hydroxybenzoate, edible essence and water. Compared with the prior art, the oral care desensitization paste disclosed by the invention can be used for sealing dentinal tubules and treating hemodia; the traditional Chinese medicine composition can also be used for treating plaque gingivitis, relieving and reducing gingival bleeding and inhibiting and reducing dental plaque; and meanwhile, the condition of mistakenly swallowing and eating in the using process is reduced.

An omni-abutment includes (i) an apical connection portion that mates / attaches with the receiving portion on a corresponding implant; and (ii) a coronal superstructure. The dental abutment provides features that are not currently found in abutments on the market, allowing the abutment to be used as a key foundation for scanning, impression taking, stability testing, and much more which ultimately would lead to an easier restorative process and fabrication of a dental prosthesis. The abutment could also be used for fabrication of a final prosthesis. The abutment may include alignment indents or protrusions in a platform thereof, internal grooves (e.g., square or rounded) as a tri-lobe or other configuration in the central axial hollow channel, recesses (e.g., divots, grooves) in the exterior periphery for increased adhesion to a gingival healing cuff, internal threading in the hollow channel, and a hex, NC or other connection at the apical connection portion.

The invention relates to the technical field of three-dimensional reconstruction, and provides a three-dimensional reconstruction method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a first image frame set of an oral cavity in a first state, and the oral cavity in the first state represents that at least one actual scanning rod is installed in the oral cavity; identifying a scanning rod area of each image frame in the first image frame set; and based on the feature information in the scanning rod region, splicing the plurality of image frames in the first image frame set, and reconstructing to obtain target three-dimensional data corresponding to an actual scanning rod in the oral cavity. According to the method, splicing is carried out based on the rigid structure, the influence of anatomical structures (such as gingiva, lip and tongue) in the image frame on the splicing precision can be reduced, and the overall precision of three-dimensional reconstruction can be improved.

The luminous dental floss of the present invention includes dental floss, a lighting system and a handle. The dental floss is detachably connected to the handle; the lighting system includes a light source system, a circuit system, a switch and a power supply system; the light source system is connected to the power supply system through the circuit system; the circuit system and the power supply system are installed in the handle; the switch is installed on the handle. The illumination light emitted by the light source system can illuminate the oral cavity. In particular, an observation window is designed on the luminous dental floss of the present invention. During use, under the illumination of the lighting system, the process of the dental floss entering the tooth gap can be directly observed, which is convenient for cleaning and effectively avoids accidentally injuring the gums.

The invention discloses a high-precision and automatic dental crown generation method. The method comprises seven steps of oral cavity three-dimensional data acquisition, full-mouth tooth semantic segmentation, upper and lower jaw point cloud precise registration, abutment and associated gingiva precise segmentation and trimming, abutment surrounding environment multi-tissue segmentation, neck-edge line secondary precise detection, and dental crown generation and multi-dimensional refinement. The method comprises the steps of oral cavity three-dimensional data acquisition, full-mouth tooth semantic segmentation, upper and lower jaw point cloud precise registration, abutment and associated gingiva precise segmentation and trimming, abutment surrounding environment multi-tissue segmentation, neck-edge line secondary precise detection and dental crown generation. Through combination of deep learning and a point cloud algorithm, high-precision segmentation of teeth and gingiva and precise reduction of an occlusion relationship are realized, an oral anatomical feature library and a clinical repair standard are fused, and through multi-dimensional fine adjustment optimization, a dental crown 3D model which is high in fitting degree, harmonious in occlusion and capable of meeting clinical requirements is generated. The method is full-process automatic, greatly improves efficiency, reduces operation threshold, reduces material waste and diagnosis and treatment cost, remarkably improves repair success rate, and is suitable for various oral repair scenes.

The invention discloses an oral care composition containing ampelopsis japonica polysaccharide and application of the oral care composition in inhibiting gingival bleeding. The oral care composition comprises ampelopsis japonica polysaccharide and an orally acceptable carrier, wherein the pH (Potential of Hydrogen) range of the oral care composition is 5.9 to 7.7. The invention also discloses an application of the ampelopsis japonica polysaccharide in the oral care composition for inhibiting gingival bleeding. The invention discloses application of silicon dioxide with a high oil absorption value in an oral care composition for improving the gingival bleeding inhibiting effect of ampelopsis japonica polysaccharide. The combination of the high-oil-absorption-value silicon dioxide and the low-oil-absorption-value silicon dioxide is applied to the oral care composition for improving the gingival bleeding inhibiting effect of the ampelopsis japonica polysaccharide; the invention further discloses application of sorbitol in the oral care composition for improving the effect of inhibiting gingival bleeding by the ampelopsis japonica polysaccharide. The oral care composition has a hemostatic effect and can effectively solve the problem of gingival bleeding.

The invention belongs to the technical field of three-dimensional point cloud processing, and particularly discloses an automatic tooth segmentation method and system for oral cavity scanning point clouds, and the method comprises the following steps: collecting and preprocessing dentition three-dimensional point clouds, extracting point cloud features containing coordinates and normal directions, and constructing a neighborhood structure; setting a first-stage multi-branch network, and performing tooth and gingiva coarse segmentation and instance initial clustering on the point cloud; setting a second-stage semantic refinement network, and carrying out local cutting on the original point cloud; setting a boundary detection and boundary offset network to enhance a tooth contact area, and refining a boundary instance by clustering to obtain a boundary enhanced instance tag; and performing label fusion, and propagating the fused label to the original high-resolution point cloud through a nearest neighbor algorithm to obtain a final semantic label and a final instance label. By adopting the technical scheme, high-precision instance-level segmentation of the complete dentition point cloud is realized through semantic segmentation, boundary detection and clustering cooperative work based on a biased field.

The utility model provides a toothbrush head and an oral care device. The toothbrush head comprises a plurality of groups of bristle components, a soft rubber part and a hard brush handle, the bristle assembly comprises bristle bundles and a fixing ring, the bristle bundles comprise free ends and fixed ends, the bristle bundles are arranged in the fixing ring in a penetrating mode, the fixed ends are exposed to the side, away from the free ends, of the fixing ring, the fixed end of any bristle bundle is integrally formed, and the fixed ends of the adjacent bristle bundles are arranged at intervals; the fixing rings are arranged at intervals and connected with the hard brush handle through a soft rubber piece formed through injection molding. According to the toothbrush head, the bristle bundles of the toothbrush head form the bristle assembly through the fixing rings, the bristle assembly is arranged at intervals through the fixing rings, the bristle assembly and the hard toothbrush handle are subjected to injection molding to form the soft rubber part, connection is achieved, and when a motor of an electric toothbrush drives bristles to vibrate through the toothbrush handle and the soft rubber part, the bristle assembly serves as an independent unit, and deformation of soft rubber is combined. The flexible glue has relatively high swing degree of freedom, and when the flexible glue is in contact with teeth, gingiva or the inner wall of an oral cavity, the flexible glue is soft in touch, so that the comfort level can be improved.

The invention relates to an oral implant positioning method and system based on deep learning. According to the method, three-dimensional point cloud data of an oral cavity is obtained and preprocessed, and a pre-trained three-dimensional deep learning segmentation model is utilized to automatically and accurately segment tooth, gingiva and alveolar bone structures. And based on the segmentation result, extracting key form and spatial relationship characteristics of the alveolar bone, and matching with an implant database to primarily select a candidate scheme. By integrating geometric constraint verification and biomechanical simulation, the candidate schemes are optimized and decided, and the optimal implant implantation position and posture meeting the safety and biomechanical requirements are calculated. And finally, automatically generating digital operation guide plate data completely matched with the gingival form of the patient according to the optimal scheme. According to the method, automation and intellectualization of the whole process from data collection to surgical guide plate generation are achieved, the defects that a traditional method depends on artificial experience, is high in subjectivity and low in efficiency are effectively overcome, and the precision, efficiency and reliability of implantation surgical planning are remarkably improved.

The invention belongs to the technical field of medical materials, and particularly relates to a tooth whitening composition and a preparation method thereof, the tooth whitening composition comprises the following components by weight: 5%-15% of hydrogen peroxide, 0.5%-1.5% of a gel matrix, 0.2%-1.0% of a thickener, 5%-10% of a humectant, 3%-8% of propylene glycol, 0.05%-0.2% of a chelating agent, 1%-3% of a sweetener, 0.1%-0.5% of sodium fluoride, and the balance of water. Aiming at the problems that an existing tooth whitening product is relatively low in pH value (most of 4.0-5.0), easy to irritate gingiva and sensitive in tooth manufacturing, and the existing tooth whitening product needs to be stored in a dark place at a low temperature and is short in whitening validity period, the pH value of the product is adjusted to 5.5-6.5, so that the product is close to oral saliva, the irritation can be reduced, the stability of the product can be ensured, the product is not easy to decompose, and the tooth whitening effect is good. Active ingredients are prevented from losing efficacy in advance, and the whitening validity period is prolonged.

The invention provides a probiotic composition for preventing and / or inhibiting oral pathogens as well as a derivative product, a preparation method and application of the probiotic composition, and belongs to the technical field of oral care. The probiotic composition comprises the following bacterial strains in parts by mass: 90 to 0.45 part of a lactobacillus rhamnosus bacterial strain A2114, 10 to 0.3 part of a plant lactobacillus bacterial strain A2124, 80 to 0.4 part of a pediococcus pentosaceus bacterial strain A2135, 250 to 0.25 part of a lactobacillus reuteri bacterial strain A21350, and 40 to 0.2 part of a plant lactobacillus bacterial strain A2109. The probiotic composition or the metabolite thereof can effectively inhibit oral pathogens such as streptococcus mutans, porphyromonas gingivalis, helicobacter pylori, escherichia coli and staphylococcus aureus. Therefore, the probiotic composition or the metabolite thereof shows a good application prospect in the aspects of preventing and relieving oral problems such as decayed teeth, periodontitis and ozostomia.

The invention provides a data scanning method and device, electronic equipment and a storage medium. The method comprises the steps that first scanning data of an oral cavity in a first state are obtained, the oral cavity in the first state refers to that at least one abutment is implanted into the oral cavity, and the first scanning data comprise initial abutment data and gingival data; second scanning data of the oral cavity in a second state are obtained, the oral cavity in the second state refers to that a corresponding scanning rod is installed on a base in the oral cavity, and the second scanning data comprise scanning rod data; determining a first conversion relation between scanning rod data and target base station data in the second scanning data; and processing the first scanning data and the second scanning data based on the initial base station data and the target base station data and the first conversion relation between the scanning rod data and the target base station data to obtain a target three-dimensional model. By means of the implant scanning method and device, the problems that the implant scanning process is complex, the scanning cost is high, and a user feels uncomfortable easily can be solved.

Proposed are schemes, solutions, concepts, designs, methods and systems pertaining to aiding and / or improving oral care apparatus having cleaning elements that are adapted, in use, to engage dental tissue of the user. Embodiments propose that, based on light reflected from a surface of the oral cavity during use, an indication of positioning with respect to a tooth surface or gum tissue of the user may be determined. That is, it may be determined whether a cleaning element is positioned at a tooth surface or gum tissue of the user by analyzing light reflected from a surface of the oral cavity.

The invention provides an adjustable oral soft tissue traction fixing device for an apical surgery. The adjustable oral soft tissue traction fixing device comprises a dentition fixing component, a lower jaw fixing component and a soft tissue traction fixing component, the dentition fixing component is used for being fixed in the oral cavity of a subject and located at the upper end of the dentition where the operation teeth are located. The dentition fixing component comprises a buckle plate and an insertion rod; a groove is formed in the lower side of the buckle plate, and the buckle plate is buckled on the dentition through the groove; the upper end of the insertion rod is fixed to the first side of the buckle plate. The lower jaw fixing component comprises a bottom plate and a side plate; the bottom plate and the side plate are connected to form an L shape; the lower jaw fixing component is used for being fixed outside the oral cavity of a subject; first insertion holes are formed in the side plates in the vertical direction; the lower part of the inserting rod is inserted and fixed in the first inserting hole; the first end of the soft tissue traction fixing component can be adjustably fixed to the lower jaw fixing component, and the second end of the soft tissue traction fixing component is used for extending into the oral cavity of a subject so as to achieve traction and fixing of gingival soft tissue flaps.

The invention relates to a computer-implemented method for adjusting a position of artificial teeth of a denture. A digital 3D model of the denture comprising at least a denture part is provided. The denture part is configured for a jaw of a patient and comprises a dental arch with a plurality of artificial teeth arranged in an artificial gingiva. A deformable gingiva section of the artificial gingiva is defined between the teeth of the plurality of artificial teeth and a fixed gingiva section of the artificial gingiva with a fixed geometrical form. The dental arch is moved as a whole relative to the fixed gingiva section in order to adjust the position of the dental arch. A geometrical form of the deformable gingiva section is deformed due to the moving of the dental arch, whereas the fixed gingiva section maintains the fixed geometrical form.

The invention relates to the technical field of microorganisms, in particular to plant lactobacillus BR32 with functions of preventing decayed teeth and improving inflammation and application of the plant lactobacillus BR32. The plant lactobacillus BR32 with the functions of preventing decayed teeth and improving inflammation, provided by the invention, has the preservation number of CGMCC No.32836, has an inhibiting effect on the growth of oral pathogens such as streptococcus mutans, candida albicans and porphyromonas gingivalis, is high in oxidation resistance, is beneficial to continuous oral cavity stability maintenance through a synergistic effect, also has relatively high hydrophobicity and self-agglutination capability, and can be used for preparing oral cavity health-care products. The compound is low in tooth environment corrosion, high in lysozyme tolerance and good in oral colonization capacity, does not have a hemolysis phenomenon in in-vitro hemolysis culture, is sensitive to common antibiotics and has relatively high food safety. The invention further provides a microbial agent, a probiotic product, a functional food, a fermented product, a bacteriostatic agent and an oral product containing the plant lactobacillus BR32 with the functions of preventing the decayed teeth and improving the inflammation, and the effects of preventing the decayed teeth, improving the inflammation, preventing dental plaque, relieving oral ulcer and the like are achieved.

The embodiment of the invention discloses a dental plaque data processing method and device, computer equipment and a storage medium. The method comprises the steps that a target oral cavity is scanned through a target scanning scheme, a target oral cavity image is obtained, the target oral cavity image is a first oral cavity image or a second oral cavity image, the first oral cavity image is an oral cavity image in which miscellaneous data is removed and a dental plaque staining area is reserved, and the second oral cavity image is a second oral cavity image; the second oral cavity image comprises a first sub-oral cavity image obtained before dyeing and a second sub-oral cavity image obtained after dyeing; a target oral cavity three-dimensional model is constructed according to the target oral cavity image, the target oral cavity three-dimensional model comprises a tooth area and a gingival area, and the tooth area comprises a dental plaque dyeing area and an undyed area. By implementing the method provided by the embodiment of the invention, the construction of the oral cavity three-dimensional model in the oral cavity dental plaque scanning scene can be realized, and the construction efficiency is improved.

The invention discloses a design method of a digital jaw pad, a forming method of an orthodontic appliance, the orthodontic appliance, an orthodontic appliance assembly, a device, equipment and a medium. The design method of the digital jaw pad comprises the following steps: acquiring a target digital tooth jaw; according to the outer contour of the target end face of the target digital tooth jaw, a datum line of the digital jaw pad on the target end face is determined, the target end face is a tooth end face, away from gingiva, in the target digital tooth jaw, and the datum line is used for generating the digital jaw pad. According to the invention, the datum line is determined according to the outer contour, and then the digital jaw pad is generated according to the datum line, that is, the digital jaw pad is generated based on the outer contour of the target end face, and for different outer contours of different patients, different datum lines can be determined to generate different digital jaw pads, that is, different digital jaw pads are generated according to different datum lines. The digital jaw pad can be individually designed according to the outer contour of the target end face of each patient, and the patient experience can be greatly improved.

The invention provides a pharmaceutical composition as well as a preparation method and application thereof. The pharmaceutical composition comprises the following raw materials in parts by mass: 2-6 parts of radix paeoniae alba, 1-4 parts of ginseng, 1-4 parts of mint and 0.3-3 parts of liquorice. The pharmaceutical composition provided by the invention adopts the radix paeoniae alba, the ginseng, the mint and the liquorice, the mint and the liquorice are medicinal and edible traditional Chinese medicines, and the radix paeoniae alba and the ginseng can be widely applied in a health food raw material list. The pharmaceutical composition is a pure traditional Chinese medicine preparation, has significant antibacterial and anti-inflammatory effects, can effectively inhibit gingival bleeding, reduce dental plaque, reduce gingival sulcus bleeding index, gingival index and dental plaque index, and significantly reduce probe depth, and has a good curative effect. The composition has a remarkable treatment effect on gingivitis and periodontitis and is free of toxic and side effects.

The present disclosure provides methods and system for generating a panoramic intraoral presentation, comprising: providing intraoral video or images; analyzing the video or images; stitching the videos or images, and; presenting the panoramic intraoral presentation, wherein at least at least part of the gingival is visible.

An oral care composition with retinoid compound, amino acid, and / or olive oil. An oral care composition with retinoid compound, a pentapeptide, such as palmitoyl KTTKS [SEQ ID NO. 2], and / or an olive oil. Methods of preventing gingival recession, stopping gingival recession, reversing gingival recession, decrease gum recession, increase gingival barrier protection, promoting collagen synthesis, promoting extracellular matrix synthesis, increasing gum resilience, increasing epidermal thickness and / or promoting fibrillin synthesis, in an oral cavity of an animal by contacting the oral care compositions with at least one surface of the oral cavity.

A flanged healing abutment for securing to an implant that has a bone graft. The flexible flange extends out laterally from the healing abutment body to contact the adjacent gingiva. The flange securely contacts the gingiva in a manner that contains the bone graft, and prevents bacterial infection of the bone graft. The flanged abutment is also able to form gingival emergence profiles. A method for securing a prosthesis to an implant utilizing a flanged healing abutment is also provided.

The invention discloses a segmentation and evaluation method for a tooth preparation shoulder, relates to the technical field of oral medicine digitization, and aims to solve the problems of low segmentation precision, neglect of anatomical distinguishing, single evaluation, unsmooth boundary and the like of an existing method. The method comprises the following steps: shoulder coarse segmentation: screening three-dimensional grid cube units based on an average curvature, and extracting a coarse segmentation shoulder of a maximum connected domain; carrying out shoulder fine segmentation, extracting inner and outer contours, and then carrying out optimization by using a greedy algorithm (ensuring smoothness through inner energy, and enabling outer energy to fit concave-convex characteristics); performing multi-quadrant division, dividing a mesial region, a distal region, a labial region and a lingual region by taking a long axis of a tooth body as a reference, and fitting boundaries by using a B spline; in the evaluation stage, the gingival height and shoulder width of each region are quantified, the weighted average height is calculated to obtain a basic score, and a final score is obtained by combining region balance deduction. The method is high in segmentation precision, achieves differentiated and comprehensive evaluation, is convenient to operate, and is suitable for oral cavity practical operation teaching and false tooth design scenes.

The utility model discloses a digitized combined guide plate for complete implantation, which relates to the technical field of dental operation tools, and comprises a retention nail guide plate and an implantation guide plate, the implantation guide plate is detachably connected with the retention nail guide plate, the retention nail guide plate is annular and is arranged around an alveolar bone, and the implantation guide plate is used for fixing the alveolar bone. A reserved gap for accommodating gingiva is formed between the planting guide plate and the inner edge of the fixing nail guide plate; in the operation process, the gingiva after flap turning can be placed in the reserved gap, fixation of the gingiva is completed, the gingiva cannot hinder installation of the planting guide plate, the accuracy of installation of the guide plate is improved, the gingiva is kept in the form of turning out towards the peripheral side, the operation area cannot be shielded, the exposure effect of the operation area is improved, the operation view is clearer, and the operation efficiency is improved. And meanwhile, the possibility that a machine needle may damage gingiva during implant hole preparation is reduced, cooling saline water can accurately reach the drilling part to cool the drilling part under the condition of no gingiva shielding during an operation, and the success rate of the operation is improved.

Systems and methods according to the present invention include a device for delivering non-invasive direct current electricity to the oral cavity of a non-human animal. The device generally comprises layers, wherein an electronic circuit assembly is protected within an enclosure, which itself is protected within a frame. Surrounding the frame, a plurality of traces connect to rails and nubs, which are exposed through the outer mold layer. The rails and nubs act as anodic and cathodic electrodes. When masticated, the non-human animal's mouth (teeth and / or gums) closes the circuit between the anodic and cathodic electrodes, delivering relatively weak direct current electricity to the animal's oral health benefit.

A three-dimensional tooth model segmentation method of a double-branch geometric attention network based on centroid guidance is oriented to oral cavity three-dimensional scanning point cloud data and comprises the steps that firstly, normalization and normal vector estimation are conducted on the oral cavity three-dimensional point cloud data, a double-branch encoder for coordinate and normal decoupling is constructed, and a global topological structure and local geometric features are extracted respectively; secondly, a separable attention mechanism guided by the mass center is introduced into a coordinate branch so as to improve the distinguishing ability of adjacent teeth, and a graph convolution attention mechanism is introduced into a normal branch so as to strengthen the boundary expression of the teeth and gingiva; further, in the fusion stage, a mass center thermodynamic diagram and multi-scale feature aggregation are combined, and joint modeling of global and local structures is achieved; and finally, collaborative optimization of instance segmentation and centroid localization tasks is carried out through a dynamically weighted joint loss function. According to the method, the segmentation precision and robustness under complex cases are remarkably improved while the light weight is kept, and the automation and clinical practicability of oral diagnosis and treatment are enhanced.

A method of planning an orthodontic treatment for a patient may include receiving a digital representation of the patient's dentition in an initial arrangement, determining a first geometry for an upper shell of an orthodontic appliance. The first geometry may include a first plurality of tooth-receiving cavities shaped to receive an upper jaw of the patient's dentition and an upper cutout disposed along an upper gingival edge of the upper shell. The method may also include determining a location of an upper elastic band receiving member. The location of the upper elastic band receiving member may correspond to a position of the upper cutout. The location of the upper elastic band receiving member may be determined so as to generate a tooth repositioning force to facilitate repositioning of the patient's dentition when an elastic band is secured to the upper elastic band receiving member.