RU2534404C2 - Method for making temporary crowns - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: wax reproduction of a temporary crown is used to recover individual typological relief characteristics in the form of the localisation of specific occlusion contact areas and near-contact regions in relation to a geometric occlusion plane perpendicular to a functional tooth axis imaged by specific closing points of the occlusion points of each pair of opposing teeth, and the wax reproduction is presented precisely that is ensured by making an inspection crown of a composition by a cast method with a silicone template on a detachable plaster model, having two diametric holes on the vestibular and oral surface of a smaller yield size for the uniform material distribution.

EFFECT: method enables by recovering the individual typological relief characteristics of the occlusion surface of teeth, to improve the aesthetic and functional abilities of the produced orthopaedic structures, reducing the length of adaptation to the prepared dental prostheses.

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Description

The invention relates to medicine, namely to orthopedic dentistry, and can be used for the manufacture of temporary crowns.

A known method of manufacturing temporary crowns on a gypsum model of self-curing plastic, hot polymerization or injection method under pressure. The disadvantages of this method are: significant time and material costs; the impossibility of reusing the wax reproduction of a temporary structure in order to accurately copy it in compliance with the individual typological characteristics of the relief.

A known method of manufacturing temporary crowns in the oral cavity of a patient using a silicone template made by a non-demountable plaster model after preliminary wax modeling. The disadvantages of this method are: the frequent need for re-clarification of the inner surface of the temporary crown, its significant adjustment when fitting in the oral cavity; difficulty in reproducing all occlusal articulation parameters and individual typological characteristics of the relief.

A known method of manufacturing a temporary crown using a cap, which consists in the fact that the cap is made using a membrane in the holder from the Adapta set by slowly heating it to a plastic state by immersing an individually selected tooth from the headset of artificial teeth in a silicone mass from the same set, after 2-3 minutes, the artificial tooth is removed, the cervical edge of the cap is cut with scissors, filling material for chemical curing is introduced into it, excluding the formation of pores, conden ation to the walls of the cap, pripasovyvayut the prepared tooth, which is pretreated with an insulating material, after curing, the cap was removed and prepared a temporary crown (patent №2326823, IPC A61C 5/08, appl. 2003110859/14, 16.04.2003) (prototype). The disadvantages of this method are: the use of an individually selected tooth from the headset of artificial teeth does not ensure the transfer of all the individual typological characteristics of the relief of the occlusal surfaces of the teeth in the form of localization of the areas of characteristic occlusal contacts and near-contact areas relative to the relief of the occlusal surfaces of the antagonizing teeth by reproducing the geometric plane of the occlusion located perpendicular to the functional the axis of the tooth obtained by characteristic the closure points of the occlusal contacts of each pair of antagonizing teeth.

The technical result of the claimed method is the ability to manufacture the most accurate temporary crowns in order to increase the functional parameters of the manufactured orthopedic structures, to increase their physiological level as a whole.

The technical result is achieved by the fact that on the wax reproduction of the temporary crown, individual-typological characteristics of the relief are restored in the form of localization of the areas of characteristic occlusal contacts and near-contact zones relative to the geometric plane of occlusion located perpendicular to the functional axis of the tooth, obtained from the characteristic contact points of the occlusal contacts of each pair of antagonizing teeth and accurate reproduction of wax reproduction, which is achieved by the manufacture of provisor th bit of a composite injection method using the silicone pattern on collapsible plaster model having two diametrically disposed holes on the vestibular and the oral surface with a smaller diameter at the exit, for the uniform distribution of the material.

The manufacture of a temporary crown, taking into account the above features, helps to ensure high precision manufacturing of a temporary crown, increasing its functional and aesthetic characteristics.

The analysis of the prior art, including a search by patent and scientific and technical sources of information, made it possible to establish that no analogues characterized by features identical to all the essential features of the claimed invention were identified.

Given the above, the proposed method for the restoration of dental defects meets the requirements of "novelty" and "inventive step".

An example of the application of the proposed method is presented in the particular clinical case of patient B., 25 years old, who came to the clinic with a complaint about the destruction of 26 teeth. An objective examination: the stump of the 26 tooth is destroyed by 1/3. When probing visible hard tissues, a creping sound was observed, and the decay test was negative. On the x-ray, the root canals 26 are sealed to the physiological tip, pathological changes in the periapical tissues and alveolar part were not detected.

The patient underwent preparation of a tooth stump under a ceramic-metal restorative crown with strict observance of the orthopedic protocol for the formation of an apical ledge. Further, according to the standard method, a double refined impression was taken.

Within 2-3 working days, a provisional crown was made from a composite in the dental laboratory taking into account the individual typological features of the occlusal surface relief. Since antagonists have an occlusal surface topography preserved in anatomical and functional terms, we adhered to the following procedure. On the occlusal surfaces of 36, 37 teeth, characteristic occlusal contacts were determined having the same spatial orientation with characteristic occlusal contacts of the 26 tooth. So, for the disto-lingual (DL) contact of the 36th tooth, the medio-palatinal (MP) 26th tooth is identical from the same side. For the centro-vestibular (CV) contact of the 36th tooth - the medio-vestibular (MB) of the same upper tooth. And for the medio-vestibular (MB) 36 tooth, the disto-vestibular (DV) of the second right premolar (Fig. 1).

Then, on a cult of 26 teeth of a collapsible model, a cap was made. Applying modeling wax in layers, we set the guide cones in such a way that with their peaks they rested against the identical characteristic occlusal contacts on the teeth of the antagonists. In this case, the contact planes on the tops of the cones had an area in accordance with the individual typological biometric characteristics of the relief of the occlusal surfaces of the posterior teeth.

Contact proximal and gingival portions of the vestibular and oral surfaces were modeled, bringing them to the upper boundary of the middle third of the crown height. Then they modeled the hillocks, their slopes, marginal fossae, ridges, fissures. Moreover, around the characteristic occlusal contacts, in accordance with the “occlusal compass”, “near-contact zones” were created. The total area of the “near-contact zones” corresponded to the individual typological biometric characteristics of the relief of the occlusal surfaces of the posterior teeth.

At the end of this stage, the position of the functional axes of these teeth and the angle between the antagonists were determined.

A provisional crown was made of a composite by injection molding using a silicone template (Fig. 2).

Then, a temporary crown was fitted in the oral cavity and fixed on temporary cement, without articulation-occlusal corrections.

To determine the degree of reliability of the proposed method, we performed orthopedic treatment of 18 patients with a diagnosis of "Pathology of hard tissue of teeth", which was made 25 restorative ceramic-metal crowns.

The observational data allow us to conclude that the claimed invention meets the requirement of "industrial applicability".

The advantages of the claimed method. Using the method of manufacturing temporary crowns allows you to:

reproduce the individual typological characteristics of the relief of the occlusal surface of each tooth;

provides high accuracy of copying the manufactured form excluding significant corrections;

to increase the aesthetic and functional capabilities of manufactured fixed orthopedic structures;

reduce the time for adaptation to manufactured fixed dentures.

Thus, everything as a whole makes it possible to improve the quality of manufactured orthopedic structures.

Claims (1)

A method of manufacturing temporary orthopedic structures, characterized in that the wax reproductions of the temporary crown restore individual typological characteristics of the relief in the form of localization of the areas of characteristic occlusal contacts and near-contact zones relative to the geometric plane of occlusion located perpendicular to the functional axis of the tooth, obtained from the characteristic closing points of the occlusal contacts of each pairs of antagonizing teeth, and accurate reproduction of wax reproduction, th achieved manufacturer provisionally crown composite injection method using the silicone pattern on collapsible plaster model having two diametrically disposed holes on the vestibular and the oral surface with a smaller diameter at the exit, for the uniform distribution of the material.

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