Method for choosing orthodontic approach

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely orthodontics, and aims at treating dentition and face disorders (DFD). It involves modelling the jaws, recording lateral and face teleradiography (TRG), orthopantomography (OPG), face and profile patient's photography. Masseteric and vocal dysfunctions are assessed. The lateral TRG is analysed by R.A.Fadeev and A.V.Kuzakova's technique. A first, second or third degree of manifestation assigned to each factor according to Table 1 'Quantitative Evaluation of Dentition and Face Disorders'. The degree of manifestation of each DFD factor provides a basis to plan a therapeutic approach to the patient. If all the factors or most of them shows the first degree of manifestation, orthodontic treatment without dental extraction is prescribed. All the factors or most of them corresponding to the second degree of manifestation requires orthodontic treatment with dental separation and extraction. Provided all the factors or most of them found in the third degree of manifestation, apparatus surgical management is applied.

EFFECT: method provides choosing the orthodontic approach ensured by the qualitative assessment of the DFD.

26 dwg, 15 tbl, 3 ex

 

The method of selecting treatment relates to the field of dentistry, in particular to orthodontics. The method allows to determine the tactics of orthodontic treatment on the basis of severity of symptoms of SCA: morphology, occlusal and aesthetic in the sagittal, vertical and transverse directions, as well as the severity of functional impairments, close position of the teeth, their retention and edentulous.

Tactics of treatment in orthodontics is determined on the basis of diagnosis. The analysis models of the jaws, x-rays, photographs of the face by known methods, whereby the diagnosis and in accordance with planned orthodontic treatment. However, when the diagnosis of upper retrognathia" in one case can be treated by removal of teeth on the lower jaw and retraction of the anterior dentition and get a good occlusion and optimal aesthetics; in another case with the same diagnosis to obtain a good result will require surgical correction of the position of the upper jaw.

Known methods of treatment planning based on the specific clinical situation, such as how planning tactics for the treatment of patients with mesial ratio of dentition, where the first degree of anterior ratio planiruetsya without the removal of teeth, in the second degree - with the removal of teeth, with the third - hardware-surgical treatment [1]. The disadvantage of this method is that the treatment is planned based on the analysis of only the occlusal and morphological characteristics of SCA, only in the sagittal plane.

Prototype selection method treatment is a method for predicting the difficulty and cost of orthodontic treatment [2], which consists in measuring the mismatch of dentition in the sagittal, vertical and transverse directions, but the method has several disadvantages:

- evaluated only the teeth of the patient;

- the difficulty of identifying inconsistencies dentitions in the lateral part of the dentition in the transverse direction;

the method does not take into account such characteristics of SCA as morphological, aesthetic, functional, and close positioning of the teeth, their retention and edentulous.

Obviously, answering questions about the causes, symptoms, localization of SCA, none of the existing methods of planning of orthodontic treatment does not give a comprehensive view about what the treatment plan will be for the patient's optimal from the point of view of the severity of the violations morphology, occlusion, facial aesthetics, functional disorders, the close position of the teeth, their retention and edentulous.

The objective of the proposed method is the rationale for the selection of treatment based on the proposed quantitative evaluation of SCA.

This object is achieved by a method for selecting treatment by assigning each characteristic SCA: morphological, occlusive, aesthetic, functional, close positioning of the teeth, their retention and edentulous, severity: first, second or third in the sagittal, vertical and transverse directions, and on this basis it is planned treatment: if the first degree of all or most of the signs orthodontic treatment without removal of the teeth, in the second degree, all or most of the symptoms - treatment with the removal or separation of the teeth, in the third degree all or most of the signs - hardware-surgical treatment.

To explain the method of selecting treatment proposed table 1 (see figure 1), which presents the parameters, based on which, the signs of SCH is assigned to the first, second, or third degree. In the vertical columns of the table presents destinations: the sagittal, vertical and transverse, and horizontal signs of SCA: morphological, occlusive, aesthetic and functional. In the second part of the table in the vertical columns represent characteristics such as the close positioning of the teeth, their retention and edentulous, horizontal - their possible exp the debts.

The method of selecting treatment works as follows: analysis of models of the jaws, lateral and fasna TWG, optg, vasna and profile photographs of the patient are evaluated dysfunction of the masticatory and speech apparatus. The analysis side of the TWG produced by the method Fadeeva R.A., Kosakowo A.V., 2009 [3]. Each sign in accordance with the data of table 1 is assigned to the first, second or third degree of severity, based on what is selected tactics orthodontic treatment: when all or most of the signs of first-degree planned orthodontic treatment without removal of teeth, when allocating all or most of the signs to second-degree treatment is planned with the separation or extraction of certain teeth, with the third degree all or most of the signs of SCA assumes hardware-surgical treatment plan.

If the parameters that characterize one sign, correspond to different degrees of severity, the parameter should be characterized by greater severity. For example, if the angle ss-n-spm is 4°, which corresponds to 1-St degree of severity of violations morphology in the sagittal direction for patients with distal ratio of dentition, and the value of Wits is 5 mm, which corresponds to 2-nd degree, the severity of violations morpho is Ogii in the sagittal direction in this case will be determined as the second.

Guided by the proposed method, it is possible to plan orthodontic treatment based on the severity of certain symptoms of SCA.

Diagnostic data is entered into the table resembles the following (table 2, 3).

Diagnostic table, part 1.

Table 2
DirectionMorphologyOcclusionAestheticsFunction
Sagittal
Vertical
The transversal

Diagnostic table, part 2.

Table 3
1st degree2nd degree3rd grade is e
Close position
teeth
The retention
The edentulous

Guided by the data of table 1, in the cells of the diagnostic table shows figures for the severity of SCA in one direction or another. After this data is analyzed, and, if all or most of the signs correspond to the first degree, the anomaly can be corrected without orthodontic extractions. When all or most of the signs of the second degree violations recommended orthodontic treatment with the separation or extraction of teeth. When allocating all or most of the signs of the third degree, in most cases, to achieve good and stable results, the treatment should be hardware-surgical.

High efficiency can be judged on the proposed statement of case histories.

Patient C., 26 (2) - Rev. -). Went to the clinic with complaints about the close position of the teeth of the upper and lower jaws. Figure 2. Pictures of the patient's face Century, 26 years before the treatment: a) fasna photograph of the person; b) fasna a photograph of a face with a smile; profile picture of the person.

During examination of the oral cavity revealed a close position of the front teeth of the upper and lower jaws, the corresponding 2-th degree of the upper and 3rd degree on the lower, anterior ratio of teeth corresponding to the 1-St degree, cross-occlusion in the lateral parts of 2-nd degree, offset miraculou line, open bite in the anterior of the 1st degree, a narrowing of the dentition of the upper jaw (Fig 3, 4A-d).

Figure 3. Optg patient Century, 26 years before the treatment.

Figure 4. Pictures of the dentition of a patient Century, 26 years before the treatment: (a) the teeth in the right projection; b) dentitions in direct projection; C) the teeth in the left projection; d) the upper teeth in direct projection; d) the lower dentition in a direct projection.

The analysis side of the TWG confirmed that the anomaly is concentrated at the level of the dentition (figure 5). The study side of the TWG, optg, photographs and models of the jaws of the patient showed that morphological violations corresponded to the 1-th degree in the sagittal and 2nd degree in vertical directions. Aesthetic violation was characterized as a 1st degree in the sagittal and vertical direction is aniah (table 4, 5). Figure 5. The up side of the TWG Century patient, 26 years before the treatment.

The results of the quantitative evaluation of SCA patient Century, 26 years, before treatment: morphology, occlusion, esthetics, and function.

Table 4
DirectionMorphologyOcclusionAestheticsFunction
Sagittal111
Vertical211
The transversal21

The results of the quantitative evaluation of SCA patient Century, 26 years before the treatment: the close position of the teeth, retention, edentulous.

Table 5
1st degree2nd degree3rd degree
The close positioning of the teeth+
The retention
The edentulous

Given the nature of the anomaly, was the method of treatment with the removal of the two lower premolars. However, to meet the wishes of the patient, and also given the fact that the lower incisors were in the correct position, was chosen as the agreed treatment plan without removal from the separation of the contact surfaces of the teeth of the lower jaw. The treatment was carried out using a fixed arc apparatus, Derichsweiler and consisted in the extension of the upper dentition, as well as in the form correction dentition of the upper and lower jaws with the subsequent creation of multiple occlusal contacts.

Below are pictures of the patient during treatment and in the retention period, the results of the quantitative evaluation of SCA after completion of treatment (6-11, 6, 7).

6. The apparatus of Derichsweiler, fixed on the patient's teeth Century, 26.

7. Pictures of the dentition of a patient Century, 26 years old, at the stage of orthodontic treatment:(a) the teeth in the right projection; b) dentitions in direct projection; C) the teeth in the left projection; d) the upper teeth in direct projection; d) the lower dentition in a direct projection.

Fig. Pictures of a patient Century, 26 years old, in the retention period of treatment: (a) the teeth in the right projection; b) dentitions in direct projection; C) the teeth in the left projection; d) the upper teeth in direct projection; d) the lower dentition in a direct projection.

Fig.9. Optg patient Century, 26 years old, in the retention period of treatment.

Figure 10. The up side of the TWG Century patient, 26 years after completion of treatment.

11. Pictures of the patient's face Century, 26 years after completion of treatment: a) fasna photograph of the person; b) fasna a photograph of a face with a smile; profile picture of the person.

The results of the quantitative evaluation of SCA patient Century,26 years after completion of treatment: morphology, occlusion, esthetics, and function.

Table 6
DirectionMorphologyOcclusionAestheticsFunction
Sagittal1N
N
Vertical2N
N
The transversalN
N

The results of the quantitative evaluation of SCA patient Century, 26 years after treatment: a close position of the teeth, retention, edentulous.

Table 7
1st degree2nd degree3rd degree
The close positioning of the teeth+
The retention
The edentulous

From the table it follows that along with the improvement of many indicators of the degree of close position changed to the first, which confirms the proposed treatment with the removal of the lower premolars. It also confirms the relapse close position of the teeth of the lower jaw in the retention period (Fig-d).

Patient P., 23 years. Went to the clinic with complaints about poor aesthetics of the face (figa-in). When the inspection was identified loss of tooth 46, during previous orthodontic treatment were removed 24 and 24 teeth, the distal ratio dentitions, deep tool overlap (figa-g).

Fig. Pictures of the face of the patient P., 23, before the treatment: a) fasna photograph of the person; b) fasna a photograph of a face with a smile; profile picture of the person.

Fig. Pictures of the dentition of the patient P., 23, to ensure: (a) the teeth in the right projection; b) dentitions in direct projection; C) the teeth in the left projection; d) the upper teeth in direct projection; d) the lower dentition in a direct projection.

The analysis side of the TWG, optg, photos, models of the jaws of the patient showed that there are lower retro - and micrognatia, C is dnee the position of the chin, protrusion of the lower incisors (Fig). Morphological disorders corresponded to the 3rd degree in the sagittal and vertical directions, the occlusion was characterized by a 2nd degree in the sagittal and 1st in vertical directions, aesthetic disturbances were characterized by 1 degree in the sagittal and vertical directions (see table 8, 9). Fig. The up side of the TWG of the patient P., 23 years, before treatment.

The results of the quantitative evaluation of SCA patient P., 23 years, before treatment: morphology, occlusion, esthetics, and function.

Table 8
DirectionMorphologyOcclusionAestheticsFunction
Sagittal
321
Vertical
3 11
The transversal
1N

The results of the quantitative evaluation of SCA patient P., 23, before the treatment: the close position of the teeth, retention, edentulous.

Table 9
1st degree2nd degree3rd degree
The close positioning of the teeth+
The retention
The edentulous

Considering the obtained results and the patient's wish to improve the facial profile was selected apparatus and method of surgical treatment. Was removed 44 tooth, fixed the Orme dentitions. The second surgical stage was to conduct operations osteotomy of the mandible moves in its forward fragment. At the final stage of orthodontic treatment were established multiple occlusal contacts (Fig-19, table 10, 11).

Fig. Pictures of the dentition of the patient P., 23 years, before surgery, osteotomy of the mandible: a) the teeth in the right projection; b) dentitions in direct projection; C) the teeth in the left projection; d) the upper teeth in direct projection; d) the lower dentition in a direct projection.

Fig. The ratio of teeth in the postoperative period the patient P., 23 (surgeon - Sdn of the Russian Federation, Professor Soloviev MM): a) the teeth in the right projection; b) dentitions in a direct projection.

Fig. Pictures of the face of the patient P., 23, in the postoperative period: a) fasna photograph of the person; b) fasna a photograph of a face with a smile; profile picture of the person.

The results of the quantitative evaluation of SCA patient P., 23 years after treatment: morphology, occlusion, esthetics, and function.

Table 10
DirectionMorphologyOcclusionAestheticsFunction
Sagitta is nioe
112
for the anterior ratio dentitions
Vertical
2N1
The transversal
N

The results of the quantitative evaluation of SCA patient P., 23 years after treatment: a close position of the teeth, retention, edentulous.

Table 11
/td> 1st degree2nd degree3rd degree
The close positioning of the teeth
The retention
The edentulous

Fig. Pictures of the dentition of the patient P., 23 years after completion of treatment: (a) the teeth in the right projection; b) dentitions in direct projection; C) the teeth in the left projection.

Fig. The up side TWG PAC. P., 23, after completion of treatment.

Patient P., 21 years. Went to the clinic with complaints of a protrusion of the chin, the back position of the upper lip, facial asymmetry (figa, b).

Fig. Pictures of the patient P., 21, to ensure: (a) fasna photograph of the person; b) the profile picture of the person.

When viewed dentitions were determined by their anterior cross-correlation in the front and lateral sides, the open bite. Separation dentitions both in vertical and in the sagittal direction was 5 mm were also Observed close to the position of the front teeth of the upper and lower jaws, the lack is their first upper premolar on the right and left, and right lower lateral incisor and premolar (figa, b).

Fig. The ratio of the dentition of the patient P., 21, to ensure: (a) the teeth in the right projection; b) dentitions in a direct projection.

Despite the ongoing remedial measures to manhood anomaly became more pronounced. Careful clinical and radiological obsledovanie, the study of digital photos dentitions, as well as the analysis of the profile of the TWG allowed to put the following diagnosis: upper micrognathia, bottom macro - and prognathia, forward position of the chin of the lower jaw, close to the position of the teeth in the front parts of the upper and lower jaws, loss 14, 24, 41 and 44 teeth (Fig). In tabl, 13 presents the results of a quantitative evaluation of SCA patient P., 21, before the treatment.

Fig. The up side of the TWG of the patient P., 21, before the treatment.

The results of the quantitative evaluation of SCA patient P., 21, before treatment: morphology, occlusion, esthetics, and function.

Table 12
DirectionMorphologyOcclusionAestheticsFunction
Sagittal33
Vertical223
The transversal121

The results of the quantitative evaluation of SCA patient P., 21, before the treatment: the close position of the teeth, retention, edentulous.

Table 13
1st degree2nd degree3rd degree
The close positioning of the teeth+
The retention
The edentulous

On the basis of a diagnosis was made and treatment plan, according to which the first stage was planned reconstructive surgery of the upper jaw and g is neoplastica. The second phase was planned orthodontic treatment aimed at correcting the shape of the dentition of the upper and lower jaws. Next, the third stage was intended to hold the osteotomy of the mandible and, finally, as the final "chord" was supposed orthodontic treatment, the aim should be to create multiple occlusal contacts dentitions (Fig-26, table 14, 15).

Fig. The ratio of the dentition of the patient P., 21, after surgery, osteotomy of the mandible: a) the teeth in the left projection; b) dentitions in a direct projection.

Fig. Optg patient P., 21, in the postoperative period.

Fig. The up side of the TWG of the patient P., 21 years after completion of treatment.

Fig. A facial image of the patient P., 21 years after completion of treatment.

The results of the quantitative evaluation of SCA patient P., 21 years after completion of treatment: morphology, occlusion, esthetics, and function.

Table 14
DirectionMorphologyOcclusionAestheticsFunction
Sagittal 2
3N
Vertical2
1N
The transversalN
11

The results of the quantitative evaluation of SCA patient P., 21 years after completion of treatment: the close position of the teeth, retention, edentulous.

tr>
Table 15
1st degree2nd degree3rd degree
The close positioning of the teeth
The retention
The edentulous

Thus, the proposed method of selecting treatment allows, guided by the severity of signs subcluster-facial anomalies in the sagittal, vertical and transverse directions, to choose the appropriate treatment plan.

Sources of information

1. Gioia Y.A., persin PS Anterior occlusion of the dentition. Educational materials for students of the postgraduate education system. - M.: Medicine, 2008 - 192 S., p.100.

2. Person PS Orthodontics. Modern methods of diagnostics subcluster-facial anomalies. - A guide for physicians. - M.: OOO "ISPC "Informika", 2007. - 248 S., s.43-44.

3. Fadeev R.A., Kozakova A.V. Clinical cephalometry. - A training manual on diagnosis in orthodontics. - SPb.: LLC "MED publishing house, 2009. - 64 S.

Table 1
Quantitative assessment subcluster-facial anomalies

The method of selecting treatment, including the production side, pasnau of alertthingy (TWG) head, orthopantomogram (optg), profile and pasnau photos of the patient's face, models of the jaws, their analysis in the sagittal, vertical and transverse directions, the evaluation of disorders of the chewing-the vocal apparatus, the close position of the teeth, their retention and edentulous, characterized in that each sign subcluster-facial anomalies (SCA) assigns the first, second or third degree, and based on the severity of each symptom of ZCA plan the tactics of treatment of the patient: when all or most of the signs first degree - orthodontic treatment without removal of the teeth, in accordance with all or most of the signs of the second degree - orthodontic treatment with the separation or extraction of teeth under all or most of the signs of the third degree - hardware-surgical treatment.



 

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FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to orthodontology and is intended for estimation of orthodontic treatment results. Lateral, frontal teleradiographs (TRG) of head, orthopantomogram (OPTG), profile and frontal photographs of patient's face, models of jaws, their analysis in sagittal, vertical and transversal directions are obtained. Disorders of masticatory-vocal apparatus, close positioning of teeth, their retention and adentia are estimated. In accordance with data of diagnostic table 1 determined is degree of expression of each sign of dentoalveolar-facial abnormality (DAA) - first, second or third - before beginning ortghodontic treatment and after its completion. Treatment efficiency is determined comparing degree of expression of DAA signs before and after treatment.

EFFECT: method makes it possible to estimate efficiency of orthodontic treatment by degree of expression of DAA signs before and after treatment.

26 dwg, 13 tbl, 3 ex

FIELD: medicine.

SUBSTANCE: invention is referred to the area of medicine, namely to orthodontia, and can be used for determination of expression degree of dentoalveolar anomaly features in sagittal, vertical and transversal directions. It allows to receive the models of jaws, lateral and anterioposterior teleradiograph (TRG), orthopantomogram (OPTG), anterioposterior and profile photos of the patient face, to determine the disruption of chewing and vocal apparatus. The analysis of lateral TRG is performed using the method by R.A. Fadeev and A.V.Kuzakova. To every sign in accordance with the data of table 1 - “Quantitative determination of dentoalveolar and facial anomalies” the first, second or third degree of expression is assigned.

EFFECT: method provides for determination of expression of dentoalveolar anomaly features: morphologic, occlusion, aesthetic, functional, teeth crowding, its retention and adentiion in sagittal, vertical and transversal directions due to quantitative determination of dentoalveolar and facial anomalies.

1 dwg, 9 dwg, 7 tbl, 3 ex

FIELD: medicine.

SUBSTANCE: invention is referred to the area of medicine, in particular to the orthopedic dentistry and can be used for determination of the level of adaptation to the different types of dental prostheses in orthopedic treatment of patients with partially or fully absent teeth. Using the Protocol of dynamic evaluation of patient adaptation to dental prosthesis with three points scale the adaptation level of patient is determined using five main groups-categories: “chewing discomfort”, “tactile discomfort”, “signs of trauma of mucosa of prosthesis bed”, “character of salivation” and “communicative discomfort”. The adaptation to orthopedic constructions is defined using dysaptation coefficient calculated using the formula: CDA=100 x У/n, where У - sum of points after the test, n - total number of statements, equating 15, CDA - dysaptation coefficient. Persons who got more than 130 points have positively verified signs of dysaptation. Subjects who got less than 60 points shall be viewed as a population with optimal flow of adaptive process. The adaptation shall be considered complete if CDA ≤10. These tests are repeated after certain time intervals during adaptation period and are subject to comparative evaluation.

EFFECT: increased validity of evaluation of adjustment of a patient to a dental prosthesis, as well provided objective criteria of adaptation value due to the use of the Protocol of dynamic evaluation of patient adaptation to dental prosthesis.

4 tbl, 1 ex

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to orthopaedic dentistry, and aims at application in prosthodontic treatment of opposite end defects in side dentitions. Left and right side teleradiography is carried out. The lines connecting an interincisal point and a Xi point, being an opening to a mandibular canal are marked on the prepared teleroentgenograms. In addition, a pass level of a directed osslusal plane is determined by marking equidistance sections from apexes of mandibular tearing canine tubers to a mucosa on an apex of an alveolar crest on the teleroentgenograms. The marked points are XiL - on the left teleroentgenogram, and XiR - on the right teleroentgenogram. Perpendiculars are drawn up from said points to the directed prosthetic planes cross points of which are marked as Pr1 - on the left teleroentgenogram, and Pr2 - on the right teleroentgenogram. The generated sections XiL-Pr1, XiR-Pr2 are measured with the derived values to be transferred to an articulator space. That is ensured by anatomic impression. The XiL and XiR points are marked on the mandibular model. Pins are fixed on the marked points. The models are fixed in the articulator in the central occlusion with the help of occlusion rolls. The occlusal plane is sensed from the right and left sides with using the measurements from two side teleroentgenograms.

EFFECT: method allows higher quality of prosthodontic treatment ensured by the use of individual parameters enabling to allow for a structural skewness of the dentoalveolar system and specific features of the patient.

14 dwg, 1 ex

FIELD: medicine.

SUBSTANCE: group of inventions relates to field of medicine. System contains facility for formation of 3-dimensional models of dentition and/or facility for formation of 3-dimensional models of jaw parts, facility for searching for zones in jaw, where it is possible or impossible to install implants, facility for searching for reconstructive elements in dentition, means for determination of suitable dimensions, orientation and configuration of implants, means for obtaining implant plans, means for comparing implant plans to each other or specified criteria, means for selection or improvement of implant plan System is intended for method realisation, and machine-readable information carrier stores computer software made with possibility of method realisation.

EFFECT: group of inventions improves endomaxillary dental implant planning taking into account biomechanical, functional or esthetic considerations, with application of volumetric data.

23 cl, 30 dwg

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, and particularly to metering systems for mouth cavity. System comprises registering device, comprising photodetector and light source, interface joined to registering device and comprising light-conducting prism, in which there is a surface of registration and surface of image generation. In process of use surface of registration is brought closely to or in contact with surface of chewing, front surface or one of side surfaces of metered row of teeth or into mouth cavity, and surface of image generation is joined to registering device. At the same time registering device is arranged with the possibility of disconnection from interface, prism represents Bauernfind prism, and source of light emits white light. Source of light is located opposite to one of prism sides and is arranged so that it may illuminate metered row of teeth or mouth cavity continuously or for a short period of time.

EFFECT: device application makes it possible to increase viewing angle to obtain image of the whole surface of row of teeth or whole mouth cavity in a single operation.

9 cl, 5 dwg

FIELD: medicine.

SUBSTANCE: invention relates to dentistry and can be used for control in case of dental implantation. X-ray examination of implantation area is carried out immediately before operation and after implant installation, during operation process and after implant installation. X-ray radiation receiver during each examination is placed in patient's mouth in area of implantation and is fixed there for the time of said examination. Cone of microfocus X-ray tube of interacting with said receiver portable X-ray apparatus is tightly pressed to examined area of maxillofacial part outside. Survey which registers state of implantation area at given moment is carried out. Result in form of corresponding image on monitor, connected with receiver, is obtained. Survey modes are selected depending on patient's age and on examination area.

EFFECT: method allows to respond in operative way to appearing in process of implantation procedure changes, reduce risk of complications.

6 cl, 5 ex

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to dentistry and can be applied in case of parodontitis disease. Estimation of density of lower and upper jaw bone tissue is carried out by means of digital densitometry by images obtained by scanning orthopantomograms. Confidence interval is built for true value y in population calculated by binary regression by formula y=α+βx, where x is mean value of density of lower and upper jaw bone tissue, y is line of regression, whose calculated value equals 126.4716, α is absolute term of estimation line, characterizing y value when x=0; β is angular coefficient characterising value by which y increases in the average, if x is increased by 1. If value of roentgenological density of jaw bone tissue is lower than 126.4716, presence of risk of parodontitis development is determined.

EFFECT: method allows to determine risk of parodontitis development objectively and with high accuracy, irrespective of collateral factors such as accompanying diseases, and irrespective of patient's age.

Measuring probe // 2335242

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, namely to measuring probes, applied in dentistry. Measuring probe for root canal is made in form of sharpened on one end rod, supplied with successive zones, visible and invisible on roentgenogram. Another end of rod is made in the form of elastic locking device made from steel wire in form of cone, with possibility of compression and wedging into root canal. Invention allows to increase accuracy of X-ray diagnostics due to locking device, which prevents axial and rotational displacement of probe rod in root canal of tooth.

EFFECT: increase of accuracy of X-ray diagnostics in dentistry.

1 ex, 1 dwg

FIELD: x-ray engineering, possible use for estimating quality of informative capacity of x-ray shadowgraphs, produced, for example, in medical diagnostics.

SUBSTANCE: method is based on determining an information index for the shadowgraph being examined, which index indicates amount of information contained therein, while x-ray shadowgraph is digitized by division onto elementary sections - pixels, and for each pixel a value is determined, corresponding to its blackening density, and the information index characterizing the x-ray image is determined from formula: where xmax and ymax - number of pixels in rows and columns, respectively, Ix,y - pixel blackening density coefficient with x and y coordinates, and Cmin - threshold value of contrast, and in case when inequality condition is satisfied for two adjacent pixels for a value, exceeding Cmin, a unit is added to information index Q, in opposite case - a zero is added.

EFFECT: increased information capacity estimate of x-ray shadowgraph.

5 dwg

FIELD: medicine.

SUBSTANCE: method involves carrying out X-ray examination with radiopaque substance being used. Biologically inert flexible cups for porolon inlay to be placed congruently to gingiva contour. The inlay is impregnated with Dimexid and left in oral cavity for 30-40 min before making X-ray examination.

EFFECT: high accuracy of diagnosis.

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