AIM. The effect of irrigants on the smear layer on the intracanalicular dentin surface is one of the important issues in endodontics. The objective of this article is to determine the effect of different concentrations of polyhexanide-based solutions and standard irrigants on the smear layer using scanning electron microscopy (SEM).
MATERIALS AND METHODS. The present study was conducted on 42 extracted teeth (third molars, first and second premolars) with formed apices that had been extracted for orthodontic indications. The teeth were decoronated and samples were prepared. In order to create a smear layer, the lumen of the canals was instrumented with H-file #40 throughout. A simulation of root canal irrigation was conducted by immersing the specimens in a 5-ml container filled with the proper solution for 1 hour: group 1 – no treatment (n = 6); group 2 – saline (n = 6); group 3 – 2% chlorhexidine (n = 6); group 4 – 3% sodium hypochlorite (n = 6); group 5 – 17% EDTA; group 6 – polyhexanide 0.1% (n = 6); group 7 – polyhexanide 0.2% (n = 6). A ~30 nm thick platinum film was sputtered onto the surface of each sample using a magnetron deposition technique. SEM microphotos were acquired on a Vega3 TESCAN scanning electron microscope (SEM) with an SE secondary electron detector, which enables imaging with high topographic contrast. The initial detector (incamera) was employed for image acquisition, with an electron energy of 30 keV. Images were acquired at magnifications of x20 (overview image), x150, x250, x500, x1000, x2500, x7500 for each sample.
RESULTS. The samples from groups 1 and 5 demonstrated the absence of a smear layer on the dentin surface and the absence of smear plugs in the dentinal tubules. Groups 2 and 3 are distinguished by the deposition of a pronounced amorphous smear layer and the obturation of all dentinal tubules. Groups 4, 6, and 7 are distinguished by the deposition of a smaller volume of smear layer on the dentin surface, as well as the presence of semi-open or completely open entrances to the dentinal tubules.
CONCLUSION. The data obtained indicates that antiseptic compositions based on polyhexanide in concentrations of 0.1 and 0.2% do not have a pronounced effect on the smear layer. However, in visual evaluation of SEM micrographs, their effect is comparable to that of 3% sodium hypochlorite. In instances where enhanced dissolution of the smear layer and smear plugs from the tubules is necessary to facilitate decontamination of the wall dentin, the combination of antiseptics with chelate compounds, such as 17% EDTA, may be employed.

INTRODUCTION. One of the main stages of successful endodontic treatment is high-quality mechanical treatment of root canals. А large number of various rotary Ni-Ti files in the dental market poses a difficult choice for the doctor, especially in the context of import substitution. It is necessary to have knowledge about the effectiveness of different system of instruments in a particular clinical case. AIM. With the help of scanning electronic mycoroscopy and computer microtomography, to analyze the quality of mechanical treatment of the root canal with files of domestic and foreign production.
MATERIALS AND METHODS. During the study, single-root and multi-root teeth with different root canal curvature were selected, which were distributed according to the Ni-Ti file system used: group 1 – RM files (RusMed), group 2 – ProTaper Universal (Dentsply Mallifier), group 3 – M-two (VDW).
RESULTS. The analysis of scanning electron microscopy of tooth showed that the largest number of open dentine tubules is determined when treating the root canal with instruments of the group 1 (55.4±1.37) and group 3 (60.25±1.59). The centering ability with a curvature of the root canal of 20–25° had no significant differences between the tools used. With a curvature of the root canal of 40–45°, the value of this parameter decreased significantly in all groups of instruments, it was greatest in the groups 1 and 3.
CONCLUSION. It was revealed that the best quality of mechanical treatment of the root canal was obtained using RM-files and Mtwo in samples with a channel curvature of up to 25°.

AIM AND OBJECTIVES. To evaluate and compare the accuracy of Root ZX, Raypex6, and I Root and electronic apex locators in the presence of NaOCl (3%), Citric acid (10%), MTAD and Green tea extract as endodontic irrigants.
MATERIAL AND METHOD. Sixty single rooted human permanent teeth were used for the study. Access cavities were prepared and the teeth were decoronated. Teeth were divided as follows: Group I-Root ZX apex locator (n=20), IA – NaOCl 3% endodontic irrigant (n=5), IB – Citric Acid 10% endodontic irrigant (n=5), IC – MTAD endodontic irrigant (n=5), ID- Green Tea extract endodontic irrigant (n=5). Group II: Raypex 6 apex locator (n=20). IIA – NaOCl 3% endodontic irrigant (n=5), IIB – Citric acid 10% endodontic irrigant (n=5). IIC – MTAD endodontic irrigant (n = 5), IID – Green tea extract endodontic irrigant (n=5). Group III-i-ROOT apex locator (n=20). IIIA – NaOCl 3% endodontic irrigant (n=5), IIIB – Citric Acid 10% endodontic irrigant (n=5), IIIC – MTAD endodonticirrigant (n=5), IIID – Green tea extract endodontic irrigant (n=5). The actual working length was determined using a 15 K file and the working model was prepared using Alginate in a rectangular box. The teeth were embedded into the working model and the electronic measurements were made with each electronic apex locator. The data was collected, analyzed and subjected to statistical analysis.
RESULTS. No significant difference was found when Raypex 6 apex locator was used along with all the endodontic irrigants except green tea extract. Root ZXshowed statistically significant difference with green tea extract and MTAD. I-root showed statistically significant difference with all the irrigants except green tea extract.
CONCLUSION. Citric acid 10% was consistently accurate when assessed with all the three apex locators, whereas Green tea extract demonstrated the least accurate readings with all apex locators.

INTRODUCTION. Composite resins, used in restorative dentistry, offer enhanced esthetic and mechanical qualities. Nevertheless, the significant issue of volumetric shrinkage during polymerization remains a concern. Shrinkage-induced stress has the potential to cause marginal defects and enamel and cuspal fractures, especially in high stress-bearing areas. The present study aimed at assessing and comparing the fracture resistance and fracture patterns of teeth restored with new impregnated cubical composite, short fiber reinforced composite, and nanohybrid composite in mesio-occlusal-distal (MOD) cavities.
MATERIALS AND METHODS. This was an in-vitro study comprising 45 extracted premolars cleaned and mounted in resin blocks. The MOD cavities were prepared in all the samples and were divided into three groups; Group I samples restored using ESPE Filtek Z350 XT restorative composite syringeTM, Group II using GC EverX posterior compositeTM (4mm), and Group III using Fibrafill cube S. Restorations were finished and polished.
RESULTS. The mean fracture resistance was 844.5±264.8, 1249.7±518.3, and 1240.8±453.3 in Group I, II, and III, respectively. Group II and III fracture resistance was comparable (p=1.00) but higher than Group I (p=0.03 with Group II, p = 0.04 with Group III). No significant difference was present in the favourable and nonfavourable fracture patterns between the three groups (p=0.108).
CONCLUSIONS. Short fiber and cubic fiber integrated composites performed similarly in terms of fracture resistance resulting in favourable fracture, however better over conventional nanohybrid composites.

AIM. The aim of the study was to study the frequency of errors in endodontic treatment according to cone beam computed tomography.
MATERIALS AND METHODS. 71 cone beam computed tomography (CBCT) scans of patients treated by random sampling who sought treatment and consultation in the period 2022–2023 were studied. 256 teeth previously subjected to endodontic treatment with the presence or absence of radiological signs of chronic apical periodontitis were examined. The assessment of the quality of root canal obturation and the features of the anatomical structure of teeth was carried out. The data of the «Ray RAYSCAN alpha 3D» cone beam computed tomograph were studied using the OnDemand3DDental program. The results were considered statistically significant at p< 0.05.
RESULTS. In 57.42% of cases, there were no signs of periapical pathology, and in 42.58%, foci of bone destruction in the periapical region were observed. Homogeneously, 58.59% of root canals were sealed to the apex. In 16.79% of cases, the removal of filling material outside the root canal was noted. 10.54% of teeth with insufficient root canal filling depth and 6.64% of teeth with a missing root canal were also identified.
CONCLUSIONS. There is a decrease in the incidence of the most common errors of endodontic treatment. The method of cone beam computed tomography is important at the stage of diagnosis and planning of endodontic treatment to assess the features of the internal structure of the tooth.

INTRODUCTION. Endodontic posts play a vital role in strengthening debilitated teeth. They are luted into the radicular space using dental cements that are generally resinous. Given that the forces faced by human teeth are loading in nature and the stresses are accumulative, the bond strength of the interfaces at both the radicular dentin and luting agent and the endodontic post and the luting agent needs to be evaluated. Micro pushout bond strength (POBS) testing is done to determine these strengths. This experimental, in vitro study evaluated the adhesion strength of endodontic posts cemented with different resin-based luting agents using micro-POBS.
MATERIALS AND METHODS. A total of 30 human lower incisors were selected and divided into three groups (n=10), based on the type of adhesive resin cement used for luting. Prefabricated endodontic fiber posts were inserted into the root canals of each tooth, and different resin types of cement – Estecem II, Multilink Automix, and Relyx Ultimate. were used to cement the fiber posts. The micro-POBS test measured the bond strength of the cemented pins to the root canal dentin.
RESULTS. The results showed that the mean POBS of Group B was higher than that of Group A and Group C. The difference between the mean POBSs of Group A and Group C was not statistically significant (p>0.05).
CONCLUSION. The resin adhesive cement used can affect the POBS of endodontic posts to root canal dentin. Clinicians should choose the appropriate resin cement for cementing endodontic posts to ensure a strong and durable bond for a good clinical prognosis.

AIM. To assess the impact of computer-assisted navigation techniques on the precision of endodontic access cavity preparation.
MATERIALS AND METHODS. A systematic review was conducted following the PRISMA 2020 guidelines. Articles were searched for online using electronic databases, including Scopus, PubMed, Cochrane, and Web of Sciences. The success rate of root canal location using computer-aided navigation techniques in root canal access cavity preparation, along with the time required for cavity preparation and the extent of tooth substance removal were assessed in this review. After eliminating duplicate articles and applying inclusion criteria, 10 studies were chosen for analysis.
RESULTS. Accuracy in location of root canal is significantly higher in the static and dynamic navigation group compared to the conventional group. Also, computer-aided static and dynamic navigation techniques removed significantly less tooth substance compared to conventional groups. Moreover, static navigation technique took significantly less time for access cavity preparation than conventional while there was no significant difference in the time taken for access cavity preparation between dynamic navigation technique and conventional technique.
CONCLUSION. The root canal access cavities prepared using static and dynamic computer-aided navigation techniques are highly precise in detecting the root canal system, require less tooth substance removal, and take less time to complete.

When starting to work within a digital protocol, especially with the ability to implement restorations directly at the patient’s chairside, doctors face the challenge of selecting the appropriate material. The correct choice of block can help achieve a highly aesthetic and quality result in a short time. Modern CAD/CAM systems allow for the fabrication of a single restoration at the patient’s chairside in just 10 minutes, as demonstrated in this clinical case.

INTRODUCTION. There is an analysis of the literature data on existing methods of maxillary expansion in this article. AIM. To analyze the published data about constriction of the upper jaw and treatment methods.
MATERIALS AND METHODS. As part of this work, a bibliographic search was conducted in the following electronic databases: eLibrary, PubMed, Web of Science and Google Scholar. The following keywords were used in the search: “narrowing of the upper jaw”, “expansion of the upper jaw”, “crowded position of teeth”, “palatal suture”, “devices for rapid palatal expansion”, “hybrid devices”, “orthodontic devices”. A manual method of searching for information was also applied. The analysis included articles mentioning information about the treatment of patients with constriction of the upper jaw.
RESULTS. After reviewing and analyzing the articles, according to the criteria described earlier, several publications were identified that meet the inclusion criteria, among which a number were submitted by foreign authors.
CONCLUSIONS. In the process of choosing a treatment method for a patient with a narrowing of the upper jaw, it is necessary to pay attention to the stage of maturation of the palatal suture when planning orthodontic treatment, as well as apply modern methods of maxillary expansion in practice, which have a less traumatic effect on the maxillary jaw. Analysis of literature has shown that the usage of hybrid devices based on miniimplants can reduce the negative effects leading to complications, however, in the course of our work, it was determined that for a more detailed consideration of this type of treatment, it is necessary to analyze a larger number of clinical cases and literature.

INTRODUCTION. According to statistics, medical workers and, in particular, dentists are exposed to stressful factors in the workplace on a daily basis. Due to the specifics of their daily activities, pediatric dentists experience a great emotional burden, especially when treating children who are not adapted to dental care, which leads to the development of an emotional burnout syndrome among specialists. AIM. To determine the effect of children’s dental anxiety on emotional stability during admission and psychoemotional status after admission by dentists with emotional burnout syndrome.
MATERIALS AND METHODS. The study involved 76 pediatric dentists and 68 patients aged 6–7 years. The psychoemotional state of dentists was assessed using the Maslach Burnout Questionnaire and a Visual Analog Scale. The behavior of children at the dental appointment was recorded according to the evaluation scale of the behavioral profile of the Melamed.
RESULTS. According to the results of the Maslach questionnaire, burnout syndrome of varying severity was detected in all specialists. Deterioration of the psychoemotional state after receiving a patient who was not adapted to dental treatment was observed in 16%.
CONCLUSIONS. The study shows that in order to prevent burnout syndrome in pediatric dentists, it is necessary to reduce professional stress through methods of adapting children to treatment, correcting patient behavior and reducing dental anxiety.

AIM. To evaluate the feasibility of using the autofluorescence stomatoscopy in dental examination of patients with tuberculosis infection.
MATERIALS AND METHODS. The objects of the study were 75 patients aged 21 to 65 years (average age 47.9±2.1 years), 48 men and 27 women (64% and 36%, respectively) who are at the stages of treatment and reha bilitation of the underlying disease (pulmonary tuberculosis) in a specialized tuberculosis sanatorium. The design of the study included the generally standard stages of a comprehensive dental examination of patients, in which diseases of the oral mucosa and the red border of the lips were additionally detected using autofluorescence stomatoscopy, as well as a laboratory Candida test was carried out. The clinical picture of the diagnosed pathological conditions of the oral mucosa, autofluorescence images and their pathomorphological features were compared. The reports of the examined persons regarding the autofluorescence stomatoscopy were evaluated.
RESULTS. It was shown that diseases of the oral mucosa and the red border of the lips in patients with tuberculosis infection are highly common (92%), are found more often in males and differ in the heterogeneity of their structure, which is dominated by candidiasis of the oral mucosa, traumatic lesions and various forms of cheilitis. The features of autofluorescence images of pathological conditions of the oral mucosa of different nature of the origin are marked. Positive feedback from patients after the autofluorescence stomatoscopy was recorded in 100% of cases.
CONCLUSIONS. The use of the autofluorescence stomatoscopy in the algorithm of dental examination of patients with tuberculosis infection is appropriate because it allows to implement the principle of oncological alertness among specialists, helps the doctor to obtain additional information about the pathological process in real time and increases the motivation of the examined persons to maintain dental health.

Adhesives for removable dentures are specialized alternative products designed to enhance the retention of dentures. They help prevent dentures from shifting, ensuring comfortable and secure wear. Adhesives come in various forms, such as creams, powders, pads, strips, and gels. Creams and gels are applied to the inner surface of the denture, creating a strong bond with the gums, while powders provide a thin layer of fixation. Pads and strips can be conveniently attached to the denture, distributing the fixation evenly. Choosing the right adhesive is important for ensuring comfort and preventing possible allergic reactions. Regular cleaning of dentures and proper use of adhesives contribute to oral health and the longevity of the dentures. This literature review presents contemporary aspects and developments in materials aimed at improving the quality of retention for removable dentures.

INTRODUCTION. Restricted mouth opening, parafunctional activity of the chewing muscles are a symptom of the development of many dental diseases caused by intra- and extra-articular causes. To verify the diagnosis, it is necessary to conduct an ultrasound examination, according to the assessment of the dynamics of qualitative and semi-quantitative parameters, it is possible to analyze the results of the treatment according to the BOS principle, which was the purpose of this study.
AIM. The aim of the study was to conduct an ultrasound assessment of the structure of the masticatory muscles against the background of relief of myofascial pain syndrome.
MATERIALS AND METHODS. 104 people were examined and treated, the relief of myofascial pain syndrome was carried out using combined treatment – injections of botulinum toxin type A, cross-taping and ozonation of the chewing muscle. Clinical criteria were evaluated – the intensity and duration of pain, the degree of mouth opening. According to the developed ultrasound criteria, the features of the structure of the masticatory muscles, the presence or absence of trigger points with diameter determination were studied. Using qualitative indicators, the length, width and depth of muscle tissue were studied.
RESULTS AND CONCLUSIONS. In patients with myofascial pain syndrome, starting at 14 days and for 6 months, stable positive dynamics was achieved, as evidenced by a statistically significant change in the studied parameters. A correlation was revealed between the degree of mouth opening and changes in the width of the chewing muscles according to the ultrasound method of investigation. The inclusion of this method makes it possible to timely, accurately and non-invasively assess the condition of the chewing muscles, while studying the size changes of which it is possible to adjust the treatment.

INTRODUCTION. The use of cytologic studies allows evaluating the dynamics of the local treatment conducted of the EUF (L43.82) LP OCML (Erosive and Ulcerative Form of the Lichen Planus in the Oral Cavity Mucosa Lining) in a comprehensive way.
AIM. Evaluation of the effect of local the effect of local treatment on the frequency of nuclei with perinuclear vacuole in the cytogram of buccal epithelium of the reticular mesh surface, hyperemic zone and erosive and ulcerative elements in patients with the erosive and ulcerative form of the flat lichen of the oral mucosa (L43.82).
MATERIAL AND METHODS. 86 patients with the EUF (L43.82) LP OCML participated in the study. The number of nuclei with perinuclear vacuole was assessed in cytologic preparations obtained from buccal epithelium, which was a reliable criterion to confirm the nature of chronic inflammation. The dynamics of cells with necrosis in the cytogram of buccal epithelium was evaluated using nonparametric criteria as follows: Mann-Whitney test (comparison between subgroups and with the experimental group), Wilcoxon test (to compare within subgroups before and after treatment). Significant differences did not exceed 0.05.
RESULTS. In the course of the treatment conducted in the cytogram of buccal epithelium there was a decrease in the frequency of nuclei with perinuclear vacuole of the reticular mesh surface and erosive and ulcerative elements in patients of the main clinical groups 1 and 2(p< 0.001). When analyzing the frequency of nuclei with perinuclear vacuole in the cytogram of buccal epithelium taken from the surface of erosions and ulcers, there were significant differences before and after treatment according to the Wilcoxon test. In the clinical group using the treatment method according to federal guidelines, the frequency of nuclei with perinuclear vacuole was observed at a significance level of p< 0.05, and when using the local treatment complex proposed respectively at p< 0.001.
CONCLUSION. Thus, in the cytogram of buccal epithelium according to the Wilcoxon test before and after the local treatment proposed, there was a more evident decrease in the number of nuclei with perinuclear vacuole than with the use of federal guidelines.

AIM. Study of the threshold of gustatory sensitivity beside flying composition of the civil aviation.
MATERIALS AND METHODS. For feature of the gustatory perception amongst examined persons of civil aviation functional studies conducted beside 58 pilots at the age 20–50 years. By means of method of threshold gustatory studied touch component of gustatory papilla’s language. The Determination of the threshold of gustatory sensitivity was conducted on an empty stomach and in 40 minutes – 1 hour after morning meal.
RESULTS. Averaged importance of the normal threshold of gustatory sensitivity beside flying composition of the civil aviation before flight formed 23.5% on four types of the gustatory irritants, 20.6%, 26.5% and 29.4% accordingly on sweet, salty, tart and bitter. After flight averaged importance of the persons with normal threshold of gustatory sensitivity on sweet and salty forms 17.2% and 20.7% under average importance of 27.6% and 34.5% – accordingly on tart and bitter irritant.
CONCLUSION. Influence disadvantage factor aircraft flight, bring about overstrain main physiological function organism, particularly water-saline exchange, brings about reflex increasing of gustatory sensitivity of the language beside flying composition of the civil aviation.

AIM. The aim of this study is to evaluate and raise awareness of the oral and dental health parameters in children aged 6 to 16 years with special care needs who are enrolled in special education institutions located in the central districts of Diyarbakir in Turkey. Specifically, the study examines the presence of caries, plaque, malocclusions, and molar-incisor hypomineralization.
METHODS. A total of 368 children with special care needs participated in the study, with ages ranging from 6 to 16 years and an average age of 9.61 years. Of the participants, 196 have intellectual disabilities, 51 have Down syndrome, and 121 have autism spectrum disorder. The clinical findings of our study include the DMFT/dmft index, plaque index, occlusal relationships, and the presence of molar-incisor hypomineralization (MIH). The data obtained were analyzed using the SPSS v21 software package.
RESULTS. The mean DMFT/dmft value was found to be 5.64, and the mean plaque index value was 1.37. The occlusal relationships of the participants were as followed: 78.26% had Class I, 11.14% had Class II, and 10.6% had Class III. Additionally, 98.64% of the participants did not have molar-incisor hypomineralization (MIH), while 1.36% did have MIH.
CONCLUSION. In our study, it was found that children with special care needs generally have poor oral hygiene, their parents/caregivers lack sufficient awareness, and the prevalence of caries and plaque index is high in the examined population.