Method of preparing gypsum model of jaw before package of basic plastic
SUBSTANCE: in oral cavity of patient in prosthesis bed flexibility of mucous membrane is measured in oral cavity of patient in prosthesis. Borders of poorly flexible areas are determined. Before packing basic plastic paste on model in cuvette, on prosthesis bed borders of poorly flexible areas are outlined. They are extended for 1.5-2 mm in towards flexible areas. Durable insulating material with width not less than value of flexibility of mucous membrane is fastened on said extended boarders of poorly flexible areas. Cuvette with gypsum model is filled with paste of basic plastic and placed under the press. Plastic polymerisation is carried out. After polymerisation prosthesis is extracted from cuvette and processed.
EFFECT: method, due to preparing gypsum model of jaw before packaging basic plastic, makes it possible to reduce excessive pressure, trauma and atrophy of prosthesis bed tissues in the area of poorly flexible areas of prosthetic bed.
The invention relates to medicine, namely to orthopedic dentistry, and can be used in the manufacture of complete and partial removable dentures.
In the manufacture of removable dental prostheses have to solve the complex task of transferring chewing pressure differential across the base of removable dentures (full and partial) on tissues of prosthetic bed in the first place on the mucous membrane. It is known that the susceptibility of the mucous membrane of prosthetic bed at different sites varies. In addition, meet toothless jaw bone protrusions on the upper jaw torus palate, lower jaw, hyoid torus and exostosis from the lingual surface of the alveolar portion in the region of the premolars, which are covered with poorly pliable mucosa.
For relief of the mucous membrane are poorly compliant sites toothless prosthetic bed from chewing pressure base denture proposed a variety of ways. And basically it's the means of obtaining functionally different prints for the manufacture of removable dentures.
There is a method of obtaining a differentiated functional reprint (patent RF №2196899). The main disadvantage of this method: it is very difficult to determine the depth of the recesses on an individual spoon on "the eye", leading to inaccuracies in manufacturing powders�Institute of removable dentures.
A method of producing a differentiated cast (P. Tanrikulu "Clinic and prosthetics of patients with edentulous jaws". Ashgabat: Maarif, 1988), models for making individual spoons in the little plots of compliant zones prosthetic bed apply a layer of plaster with a thickness of 1.5-2 mm. the Disadvantages of this method: it is impossible to apply a layer of plaster, and insulation thickness 1-1,5 mm - nominal value.
We have also proposed a method of obtaining a differentiated functional impression with full removable dentures (patent RF №2271771). Disadvantages: the method is used only in the absence of teeth, it is quite time-consuming, requires great precision (which is extremely difficult) and overlay individual tray with impression material in the patient's jaw when taking an impression.
Closest analogue (prototype) of our proposed method is "Isolation of bone protrusions on poorly compliant toothless sections of foil - Fig.171 in the book "Dental technology", M., 1967, V. N. Kopeikin, etc. P. 245-247. The positive side of this method: a non-flexible areas of the mucous membrane of prosthetic bed almost isolated in the last step of fabrication of a removable prosthesis that improves the accuracy of manufacture of the denture. Disadvantages: no individual data measurements mucosal pliability of PR�tesnogo bed for each patient, i.e. the thickness of the foil is almost the same.
The technical result of the proposed method of preparing a plaster model of the jaw before packaging (moulding) plastic base is aimed at reducing excessive pressure, trauma and atrophy of tissue prosthetic bed in the area of little pliable sections prosthetic bed.
The essence of the invention is that the method of preparing the plaster model of the jaw in front of the package base resins, including fabrication and gluing on little flexible areas of prosthetic bed plaster models of the insulating material in the patient's mouth for denture-supporting measure compliance of the mucous membrane and define the boundaries a little pliable sections, and before the test package base resins on a model in a ditch on prosthetic bed delineate the boundaries a little pliable sections, expand by 1.5-2 mm in the direction of compliant zones and these little flexible areas glued solid insulating material of thickness not less than the magnitude of mucosal pliability on extended boundaries a little pliable sections.
A method of preparing a plaster model of the jaw before packaging (moulding) plastic base is as follows.
After melting the wax denture base of the cuvette on a plaster model of the jaw, the denture�om the bed of a pencil mark (paint) little or bad flexible areas, according to the data obtained in the patient's mouth. The degree of compliance of the mucous membrane of prosthetic bed measuring apparatus Lira-100, pay special attention to the degree of compliance of the mucous membrane of prosthetic bed at the boundaries a little and poorly compliant areas. As the insulating material used, for example, tin foil. Foil thickness was equal to the compliance value of the mucous membrane of prosthetic bed on the border of little or poorly compliant area (s). Usually little or no boundaries malleable areas expand by 1.5-2 mm to exclude excessive chewing pressure on the mucous membrane of these zones to the base of the denture. Next, the dried plaster model of the jaw air and glue the plate (plate) foil to the plaster model on the marked pencil lines. As the glue used various cement for fixing dental crowns and other adhesives.
Thereafter, on the entire surface of the prosthetic bed with pewter (tin) plate was applied a very thin layer of insulation (oil, etc.) to prevent bonding of the plaster with plastic. The cuvette with a plaster model of the filled dough base resins and placed under the press. Further polymerization was carried out plastic in a known manner. The denture was removed from the cuvette was treated. The prosthesis (without tin plates) passed� the patient.
We made 25 of dentures (18 full and 7 partial) by the proposed method 12 patients. The results are good. Patients did not require correction of the bases of removable dentures due to the lack of pressure and trauma of the mucous membrane of prosthetic bed in the area of little pliable zones.
A method of preparing a plaster model of the jaw in front of the package base resins, including fabrication and gluing on little flexible areas of prosthetic bed plaster models of the insulating material, characterized in that in the patient's mouth for denture-supporting measure compliance of the mucous membrane and define the boundaries a little pliable sections, and before the test package base resins on a model in a ditch on prosthetic bed delineate the boundaries a little pliable sections, expand by 1.5-2 mm in the direction of compliant zones and these little flexible areas glued solid insulating material of thickness not less than the magnitude of mucosal pliability on extended boundaries a little pliable areas.
SUBSTANCE: stock tray is used to contour a jaw anatomical pattern. That is followed by making a stone cast after the contoured pattern. Expected trays borders are marked on the stone cast. A recess is created on the contoured pattern where a handle of the baseplate tray is supposed to be. A wax plate 0.5-1 mm thick is crimped on the stone cast over the whole surface along the borders of the expected baseplate tray. That is followed by placing thermal mass vertical bars 2 mm high on an alveolar crest within canines and first molars. Quick-setting plastic paste is further prepared. The above paste is applied on the stock tray with the anatomical pattern, and the stock tray with the pattern and plastic paste are pressed against the stone cast with wax. Herewith, 10-12 minutes are left until the quick-setting plastic polymerises completely. The finished baseplate tray with the handle is removed. Its borders are processed.
EFFECT: by reducing plastic pressure on the prosthetic bed tissues, method enables providing the higher quality of the produced functional patterns with total and partial adentia, reducing the time required for the baseplate tray processing.
SUBSTANCE: invention relates to medicine, in particular to dentistry and is applicable in making stone models of jaws in treating patients sufferingfrom severe periodontal disease, parodontosis and other diseases characterised by disordered axes of teeth, including a fanlike divergence. Two narrow bands with one-side adhesive coating are applied for taking a palatal vault impression on the bed or a dental or alveolar process impression of the perforated tray on the bed. The perforated tray is coated with an impression material and introduced into the patient's oral cavity. After the impression material hardens, the tray is removed from the oral cavity and the stone model is poured. After cast is crystallised, the perforated tray is first removed from the stone model by extending the band ends brought out on an outer surface of the tray borders. That is followed by fragmental removal of the impression material from the stone model by cutting the impression material on the upper jaw model first along a projection of the alveolar processes and palatine suture; then transections are performed within the molars, premolars and canines on the models of the upper and lower jaws.
EFFECT: by separating the impression tray from the impression material to be fragmented, the method ensures preserving the dental integrity of the stone model when removed from the impression material and the tray.
FIELD: veterinary medicine.
SUBSTANCE: impression is taken from both jaws of the animal. The working models of jaws are moulded. Undercuts are isolated with wax. On the working model the boundaries of a future baseplate are outlined. In the first embodiment the dental arcade is completely covered along the entire length with the basic wax. On the prepared working model the future baseplate is formed from the self-hardening plastic. The structure is polymerised. The finished baseplate is removed from the working model, cut along the boundaries, treated with cutters and polished. In the second embodiment the dental arcade is completely covered along the entire length with the gypsum. On the prepared working model the future baseplate is formed from the basic wax. The construction is mounted with gypsum in the cuvette. The wax is boiled off. The plastic ready for forming is packed in the cuvette. After heat treatment the cuvette is opened. The finished baseplate is treated with cutters and polishers.
EFFECT: method enables to produce baseplates for veterinary use by making the height of the boards of the spoon greater than the length of fangs of animals for which the baseplate is used.
SUBSTANCE: group of inventions refers to medicine, namely to orthopaedic dentistry, and aims at simultaneous impression taking of upper and lower dentures, as well s separately of upper, lower jaws or parts thereof. A dental impression device comprises a suction pump with a reducing valve and a vacuum hose. An impression material is an elastic U-shaper filled with a bulk that is talcum powder, comprising a neck and an annular sealing, and an assembled body inserted into the neck. The assembled body consists of the body itself with an annular groove, a filter cartridge, a non-return valve to prevent loss of pressure, a non-return valve seat in vacuum an internal opening of which is funnel-shaped with rounded walls, and a screw cap to avoid the non-return valve drop out from the body. The annular sealing of the neck of the elastic shaper comes into the annular groove of the body. A vacuum hose connected to the suction pump with the reducing valve is attached to the body. The method for dental impression consists in the fact that an impression process involves generating primary vacuum in the elastic shaper, correcting outer and inner surfaces of the impressions, and a final impression is formed by generating secondary vacuum. To form occlusal surfaces, the upper and lower impressions are formed simultaneously. To prepare another dental impression, vacuum is released by moving the non-return valve from the body seat. To prepare upper or lower dental impressions, an impression tray is used; a front portion of the tray comprises a socket for the body assembled with the filter cartridge and a portion of the neck of the elastic shaper.
EFFECT: due to using the device correcting the impression in process, the method enables impressing the oral cavity accurately and eliminating the problem of vomiting reflex in elderly people and children.
5 cl, 3 dwg
SUBSTANCE: invention relates to medicine, namely to dentistry and is intended for diagnostics of esthetic impairment of marginal parodontium and dentitions. Parameters of biological zone of examined area are measured by Kois method in important zones and fixed in formalised map. Digital photography of marginal parodontium is performed in different projections, with preliminary application of two coordinate points at known distance on mucous membrane with thin contrast marker. Photographs are generated on resource of Autodest corporation by means of Autodesk 123DCatch software. After calculation of model and sending three-dimensional model of marginal parodontium by server in programme Autodesk 3dsMAX marking of parameters of individual's biological zone is performed. Distortion of image is taken into account by measurement of distance between applied coordinate points. Versions of design projects of marginal parodontium are created by correcting three-dimensional model in accordance with principles of existence of biological width and patient's esthetic demands. Simplicity of method application, minimal economic costs and invasive manipulations, maximal information about patient's esthetic status make it possible to widely apply the invention in everyday clinical practice of dentist.
EFFECT: method makes it possible to carry out quality planning of patient's esthetic rehabilitation.
SUBSTANCE: invention relates to field of medicine, namely to orthopedic dentistry and orthodontics, and is intended for diagnostics of dentition in degree, required and sufficient for carrying out treatment with vivid presentation of predicted results. Physical models of upper and lower dentitions are made. Occlusive-reference template is made in form of double orthopedic impression with attached reference parallelepiped. Optic mould of craniofacial area of head when dentitions are in joined position of habitual occlusion. Similar mould with placed in mouth occlusive-reference template is obtained. Correctly matched 3D models of upper dentition and lower dentition, template and both moulds are obtained. On the basis of mentioned five 3D models intermediate complex model is obtained with further removal of template model and model of craniofacial area of head with template in mouth is obtained. Final 3D model "head-dentitions" is obtained.
EFFECT: method makes it possible to provide diagnostics of dentition in degree, required and sufficient for carrying out treatment with vivid presentation of predicted results due to obtaining 3D-model of head with correctly located in it dentitions.
3 cl, 6 dwg
SUBSTANCE: group of inventions relatse to field of medicine, in particular to dentistry, and can be used in orthopedic dentistry for making impression for toothless jaw. In accordance with the first version individual spoon for making impression for toothless jaw contains spoon body with handle. Body of individual spoon is made from rigid layer with possibility of placing on it soft 2-3 mm thick layer, covering prosthesis bed, to 1.5-2.0 mm before reaching its borders. Rigid layer is made with possibility of covering soft layer, including remaining part of prosthetic bed. In accordance with the second version manufacturing of impression spoon is performed with its further perforation. Perforation does not reach edges of individual spoon body by 3.0-5.0 mm and has hole diameter 1.0-3.0 mm with possibility of removing pressure of impression mass on mucous membrane of prosthesis bed.
EFFECT: high accuracy of manufacturing individual spoon for making impression, which ensures stable fixation of detachable prosthesis for toothless jaw, increased chewing efficiency and possibility of prosthesis displacement following displacement of actively mobile mucosa in area of mucogingival fold.
2 cl, 8 dwg, 2 ex
SUBSTANCE: invention relates to medicine, namely to orthopedic dentistry and is intended for taking impressions with application of individual spoon in prosthetics with orthopedic constructions. Impression from both parts of jaw is taken with simultaneous registration of central occlusion. Model of individual spoon is made, for which purpose on gypsum model marking of boundaries, isolation of stumps of prepared teeth undercuts and dentitions with wax. Kapron mesh is cut out laid on chewing surface and cutting edges of teeth in places of closure with antagonists. In areas of included or end defects, light-polymerised plastic is laid with excess in plastic state. Individual spoon, which copies shape of stumps of prepared teeth and tissues of prosthetic bed, is formed, edges of kapron mesh are fastened into its sides. Articulator is closed to obtain impressions of dentition in area of preparation or absence of teeth. Model with spoon is extracted from articulator and placed into light-polymerisation chamber. After polymerisation spoon is extracted from chamber. Fitting in oral cavity, correction of closure in area of central occlusion are carried out until tight closure with teeth-antagonists is obtained. Impression in position of central occlusion under chewing pressure is taken.
EFFECT: method makes it possible to reproduce relief of prosthetic bed exactly due to constant pressure and distinct positioning of individual spoon without possibility of its displacement.
11 dwg, 1 ex
SUBSTANCE: group of inventions relates to orthopedic dentistry and can be used for obtaining impressions of dentition and alveolar process. Impression tray contains of tray, which corresponds to the shape of dental arch of mandible, which has external and internal boards with vertical slots on walls on their entire length, which contain them with formation of chute for impression mass rigid base with holes on entire surface, rigid platform and handle, attached to external wall of external board. Along lower edge of handle there is peripheral projection, connected with ends with first longitudinal stiffening rib oat the same level with formation of flat surface. Rigid platform is formed below rigid base between external and internal boards and represents lattice structure, formed by longitudinal stiffening ribs in form of external, internal and middle bars, passing along entire length of rigid base, and stiffening ribs in form of bars passing on width of rigid base at a distance from each other on entire base length. Around each hole in rigid base formed is reservoir for collection of pressed out impression mass. Impression tray is provided with stiffening ribs, one of which is made in form of lug on entire upper edge of internal board, the other stiffening rib being located from opposite side of handle in the centre between two additional side boards and is fixed with one end to said external longitudinal stiffening rib at the same level with it, and with its other end being fixed to handle surface. The second version of the group includes impression tray for upper and lower jaws.
EFFECT: obtaining impressions with minimal deformation due to rigidity of impression tray.
2 cl, 11 dwg
SUBSTANCE: invention is referred to dental surgery and designed for centric relation restoration with performance of prosthetic repair in patients with complete denture. Complete provisional denture is made for both jaws with bilateral balanced occlusion and setup of anterior teeth in any relation, but with no incisal surface overlap, and of grinding teeth - with setup in orthognathic relation and with no tubers on grinding surfaces. The occlusion is pitched higher by 1-2 mm, whereas the occlusal plane in distal aspects must be lower than the prosthetic one. Prostheses are put on prosthetic bed in the oral cavity of the patient. After final mucosa compression and optimal adjacency of prosthesis base the intraoral correction is performed for occlusion ratios and compression surface. The check is performed for the rightness of occlusal vertical dimension determination. After some time after which the lower jaw takes position when the condylus is near the base of clivus and does not constrict the tissue of bilaminar area, the fixation is performed for resulting functional centric jaws relation. The remodeling is performed for chewing and incisal surfaces of artificial teeth.
EFFECT: increased adjustment to physiology and precision of definition of centric relation of jaws.
SUBSTANCE: computer analysis of the patient's speech material is performed. The frequency of sound is determined in the norm for a phoneme, selected from the group: "s", "ts" and "f", the frequency of the same sound for the patient before prosthetics, the frequency of the same sound after prosthetics. After prosthetics the phonetic rehabilitation index (FRI) is calculated by the mathematical formula. If FRI is larger than one, successful phonetic adaptation of the patient to dental prosthesis by the phoneme is determined.
EFFECT: method makes it possible to increase the accuracy of estimating the quality of performed dental intervention, and correction.
3 dwg, 1 ex
SUBSTANCE: odontopreparation is followed by impression taking. A dental model is injected into cast. Anatomic forms of retainer teeth is restored in wax, and an intermediate part of the prosthesis is modelled. The cast model is imprinted in silicone. The teeth are prepared. A reinforcing fibre tape is prepared. A segment of fibre tape impregnated with universal adhesive is placed on the teeth along the full length taking into account a profile of the masticatory surface up to an equator. The prepared segment is fixed on the teeth with the universal adhesive by polymerisation in halogen light. Self-hardening plastic is placed into the silicon impression to be inserted into the oral cavity. After the plastic is self-polymerised, the impression together with the denture is removed from the oral cavity. The denture is removed from the impression and polymerised additionally within its intermediate portion.
EFFECT: by reinforcing the denture with the fixed reinforcing fibre tape, the method enables increasing durability of the temporary denture, making the temporary denture at one visit and maintaining its aesthetic properties.
1 dwg, 2 ex
SUBSTANCE: invention refers to medicine, particularly to dentistry, and can be used in orthopaedic dentistry for oncologic patients. A removable resection upper jaw denture with a myogymnastic element comprises an immobilising and resection portions and a removable myogymnastic element. The immobilising portion is configured in the form of a fixing plate having a clasp fixation system on the rest teeth. The resection portion is provided with artificial plastic teeth, contacts directly the rest upper jaw tissues and form a prosthetic bed for a permanent denture. The myogymnastic element is configured in the form of an orthodontic wire individually curved for each patient and having various cross-sections with a bead of a variable diameter sliding along the orthodontic wire. Plastic deposits are made in a base in attachment points of the myogymnastic element. The orthodontic wire is fixed by tension into blind canals.
EFFECT: invention enables combining the dental prosthetics and correction of postoperative tongue dysfunction in the oncologic patients.
SUBSTANCE: group of inventions refers to medicine, is applicable in dentistry and involves a method for preparing a dental instrument, the dental instrument configured to be used by a dentist, a set of pads to be used by the dentist (versions) and a method for the tooth preparation for treatment (versions). A method for making the dental instrument comprising the pad and configured to be used by the dentist; the instrument has at least one dental cutting instrument used for the tooth structure extraction, involves the stages: detecting the pad sized after the above tooth and after at least a portion of an adjacent tooth; modelling the pre-detected horizontal, vertical and inclined motions, which are supposed to be repeated by at least one dental cutting instrument to extract at least a portion of the detected portion of the tooth to be extracted; detecting the first and second guide edges inside the pad; making the above detected pad with the above first and second guide edges. The above first guide edge corresponds to the above pre-detected horizontal, vertical and inclined motions. The second guide edge inside the pad is remote from the first guide edge at a distance d. The second guide edge corresponds to the above pre-detected horizontal, vertical and inclined motions. The first and second guide edges are thereby presented to contact the dental cutting instrument to direct its horizontal, vertical and inclined motions in accordance with the pre-detected horizontal, vertical and inclined motions to remove at least the above portion of the pre-detected portion of the tooth to be extracted.
EFFECT: group of inventions enables providing the accurate tooth treatment for the following stage of treatment both by experienced and inexperienced dentists.
21 cl, 8 dwg
SUBSTANCE: invention refers to medicine and is applicable in treating lower molars with destruction in root bifurcation. Laboratory and radiographic examinations of an involved tooth are performed. A crown-radicular separation is followed by introducing an osteotropic material. Residual dental stumps are prepared for whole-piece crowns. A working impression of the lower jaw and an auxiliary impression of the upper jaw are made. The whole-piece crown with a washing space surrounding the separated bifurcation is made. It is fixed on dental cement.
EFFECT: method ensures the integrated treatment involving surgical and orthopaedic interventions and enables preserving the dental functions and restoring its anatomical shape.
SUBSTANCE: invention refers to medicine, particularly to orthopaedic dentistry, and can be used for partial laminar and clasp prostheses. A clasp system for fixing a removable partial denture of a single tooth consists of a basis with artificial teeth and a denture clasp. One end of the clasp comprises a mechanical device consisting of an inner O-ring abutment and an outer matrix and configured as a pivot, while the other end comprises a clasp seat in a rigid socket on an artificial dental crown. The outer matrix is fixed in the prosthesis basis and detachable together with the prosthesis, while the inner O-ring abutment is ball-shaped and connected to a clasp arm. The seat of the clasp socket is mounted on the artificial dental crown vertically or horizontally either from the lingual, or palatal, or approximal surface.
EFFECT: invention enables providing a more stable fixation of the detachable clasp system, a masticatory effectiveness and an appearance, and also avoiding the negative effect on the parodontium.
3 cl, 12 dwg, 3 ex
SUBSTANCE: group of inventions refers to medicine, namely to dental orthopaedics, and aims at developing a physical or virtual dental model as a supplement for making a dental implant. The method involves imaging upper and lower jaws, a motion field of the temporomandibular joint in disclusion, a contact region of the teeth in occlusion and in an extensive field of motion. A path of travel between the lower and upper jaws is calculated. Making the dental implant is ensured by using a fastening device taking into account the patient's diagnostic information, comprising the fastening device with a lower part and an upper part movable in relation thereto. The upper part represents the upper jaw, while the lower part is the lower jaw. Three-dimensional digital data of the lower and upper jaws, as well as occlusion in the central position are taken into account to calculate the motion and limitations fields of the jaws in relation to each other.
EFFECT: by using the individual patient's data, the group of inventions enables the temporomandibular joint compliance, developing the supplementary model providing the substantial saving of consumable materials and reducing the time for developing the physical and virtual dental model.
19 cl, 5 dwg
SUBSTANCE: invention relates to field of medicine, in particular to dentistry, and can be applied for orthopedic dental rehabilitation of oncologic patients with post-operation defects of upper jaw and dentitions. Disconnecting post-operation dentoalveolar prosthesis of upper jaw for formation of prosthetic bed in the section of performed operation and initial impact for epithelisation of defect boundaries contains basis, scar ring former, retention elements and artificial teeth. Artificial teeth are obtained by initial model after scanning patient's own teeth in pre-operation period. Prosthesis is made in one piece by method of computer milling from plastic disc.
EFFECT: invention makes it possible to make disconnecting post-operation dentoalveolar prosthesis for upper jaw for all types of its resection, which provides formation of prosthetic bed in the section of performed operation, optimal fixation under unfavourable clinical conditions of prosthetic bed, recovery of chewing function and restoration of height of the lower third of face after surgery.
SUBSTANCE: invention refers to medicine, particularly to dentistry, and is applicable in making a releasing postoperative maxillofacial prosthesis for all types of maxillectomy. Surgical manipulations are preceded by imprinting both patient's jaws. A dental occlusion is recorded. Models are made after the imprints. The models are fixed in an articulator, and denture teeth are mounted in place of proper missing teeth. The working model is scanned and digitised by means of a computer unit of CAD/CAM system. Planned surgical area boundaries are defined on a basic model, and the above boundaries are virtually engraved vertically and horizontally at a width and a depth of 2.5 mm. The engraved model is scanned by means of the computer unit of CAD/CAM system. The computer unit is also used to model the releasing postoperative maxillofacial prosthesis with retention elements and artificial teeth by matching the prosthetic bed of the engraved model and dental arches of the basic model prepared pre-operatively. The modelled construction of the releasing postoperative maxillofacial prosthesis with artificial plastic-plate teeth is milled. The made prosthesis is processed. The prosthesis is fixed in the patient's oral cavity.
EFFECT: by providing a one-piece plastic configuration of the releasing postoperative maxillofacial prosthesis with the retention elements by computed milling, the method enables recovering the masticatory function, ensuring the prosthetic bed formation within the surgical area and the optimum fixation in the unfavourable clinical environment of the prosthetic bed.
SUBSTANCE: invention refers to medicine, particularly to dentistry, and is applicable in making a releasing postoperative maxillofacial prosthesis for all types of maxillectomy. A patient's oral cavity is optically imprinted. An optical imprint is digitised by means of a computer unit of CAD/CAM system. Planned surgical area boundaries are modelled on the formed image, and the above boundaries are virtually engraved vertically and horizontally at a width and a depth of 2.5 mm. A base of the releasing postoperative maxillofacial prosthesis is modelled with retention elements, and scanned patient's dental arch images are attached by matching technique. The modelled construction of the releasing postoperative maxillofacial prosthesis with artificial plastic-plate teeth is milled. The made prosthesis is processed, ground and polished. The prosthesis is fixed in the patient's oral cavity.
EFFECT: by providing a one-piece configuration of the releasing postoperative maxillofacial prosthesis with the retention elements by computed milling, the method enables recovering the masticatory function, ensuring the prosthetic bed formation within the surgical area and the optimum fixation in the unfavourable clinical environment of the prosthetic bed.
FIELD: medical engineering.
SUBSTANCE: method involves producing an opening of diameter reaching 2 mm with diamond or hard alloy bore in adhesive cover after preparing abutment tooth and prosthesis or widening already available perforation also to diameter of 2 mm. The prosthesis is set on the abutment tooth and place is marked for creating and directing pin-canal in the area of cutting one-third of the frontal abutment tooth or in the lateral abutment tooth equator area. The pin-canal direction is to correspond to path for introducing the prosthesis. The pin is screwed-in with screwdriver and holder to a depth of about 2 mm into dentin. The prosthesis is set on the abutment for making control. The pin is filed-off to adhesive cover layer after having fixed the prosthesis on composition cement.
EFFECT: prolonged service life; high functional value.