18, June 2022
17:00 – 18:30
Speakers

Poster Session

KNOWLEDGE OF MOLAR INCISOR HYPOMINERALISATION AMONG DENTAL STUDENTS

S.Petrova DMD*, T.Nihtianova DMD, PhD*, P.Sapunarova DMD, PhD*, K.Tabutova DMD*, A.Bailey**

*Department of Pediatric Dentistry, Faculty of Dental Medicine, Medical University – Plovdiv 

**student, Faculty of Dental Medicine, Medical University – Plovdiv 

Introduction. Molar-incisor hypomineralisation (MIH) is a hypomineralisation of systemic origin, expressed in demarcated, qualitive defects in the enamel of one to four first permanent molars, frequently associated with affected incisors. Recently, there has been an increase in the prevalence of MIH worldwide.  

Aim. To evaluate the level of clinical recognition and theoretical knowledge of MIH among 5th year dental students at the Faculty of Dental Medicine at the Medical University – Plovdiv. 

Materials and Methods. The survey has been conducted at the Department of Paediatric Dentistry at the Faculty of Dental Medicine in Plovdiv among 50 fith-year Bulgarian course dental students and 21 fifth-year English course dental students. The survey includes 15 MCQs and is designed to test the knowledge of 5th year dental students of MIH. The statistical analysis of the data has been performed using SPSS software.

 Results. The results of the survey showed that 74% of the respondents indicated the correct definition of MIH as well as the affected teeth. 96% of the participating students indicated hypersensitivity as the main symptom in patients with MIH. 79% of the students surveyed answered that they do not feel confident in the MIH diagnosis and 96% of them have never treated a patient with MIH.

Conclusion. The 5th year dental students demonstrated a good level of theoretical knowledge of MIH but encountered difficulties in the clinical recognition and treatment of patients with MIH. 

Key words: MIH, survey

 

STUDY PROTOCOL FOR INVESTIGATION OF THE THERAPEUTIC EFFECTS OF P11-4, CPP-ACFP AND RESIN INFILTRATION ON ARTIFICIAL EARLY ENAMEL LESIONS

  1. Uzunova, DMD*, S. Petrova, DMD*, K. Georgiev, PhD**, D. Danalev, PhD***, A. Belcheva, PhD*

*Department of Paediatric Dentistry, Faculty of Dental Medicine, Medical University – Plovdiv, Bulgaria

**Department of Operative Dentistry and Endodontics, Faculty of Dental Medicine, Medical University – Plovdiv, Bulgaria

***Biotechnology Department, University of Chemical Technology and Metallurgy, Sofia, Bulgaria

 

Introduction. The selection of an appropriate protocol to treat WSLs and accurately and reliably monitor lesion dynamics is crucial to avoid the need for operative treatment. 

Aim. Aim is to create a protocol to compare the effect of self-binding peptide P11-4, casein phosphopeptide-amorphous calcium fluoride phosphate and caries infiltration on artificial enamel lesions on smooth surfaces after pH-cycling in a bioreactor system using surface microhardness investigation.

Materials and methods. This is a randomized ethics-approved in vitro study protocol. Total 48 samples from freshly extracted due to orthodontic indications premolars are randomly divided into four groups of 12 samples: Gr-NT (no treatment), Gr-CR (P11-4), Gr-V (CPP-ACFP), Gr-I (Icon) groups. Artificial caries lesions will be assessed by enamel surface microhardness evaluation at baseline level, after demineralization, after pH-cycling and 30 days after pH-cycling model. Normally distributed variables will be tested with two-way ANOVA analysis and in lack of normality, non-parametric alternatives will be applied for statistical analysis.

Results. The review of the scientific literature gives grounds for accepting the following alternative hypothesis: P11-4 shows significantly better effect on enamel microhardness compared to CPP-ACFP and caries infiltration. The primary results track the remineralization potential, and the secondary ones the stationing of artificial initial carious lesions.

Conclusion. The comparison between traditional remineralization, biomimetic regeneration and resin infiltration as forms of non-invasive preventive treatment allows to choose the best clinical approach in the treatment of initial carious lesions and dental caries management.
Key words: SAP P11-4, CPP-ACFP, caries infiltration, early enamel lesions

 

METHODS OF ANALYSIS FOR DISINFECTION OF BASIC PROSTHETIC DENTAL MEDICINE IMPRESSION MATERIALS 

  1. Vaskova DMD, N. Apostolov DMD PhD, T. Uzunov DMD, PhD

Department of Prosthetic Dental Medicine

Faculty of Dental Medicine 

Medical University – Sofia

Bulgaria

Introduction. The conventional impression used in the prosthetic treatment is the main transfer for infection for the dentist, the nurse and the dental lab. The main for this team health prevention is the significance of the infection and the control and prevention method efficacy 

Aim. The aim of the research is to make microbiologic analysis of the disinfection methods efficacy of the different kinds impressions used in the prosthetic treatment. 

Materials and Мethods. 63 impressions (Alginate, A-silicons, C-silcons) were observed. The microbic environment growth was analysed by device MALDI-TOF. The impressions were disinfected with: spray splashing, solutio soaking and ultrasonic device disinfection.  

Results. The explored impressions, independently of the impression material showed moderate or plentiful bacteria growth. The most found bacteria were: Streptococcus sanguinis, Candida albicans, Streptococcus mitis, Esherichia coli, Streptococcus epidermidis. There is no bacteria growth, independently of the used disinfection mehod. 

Conclusion. The research shows that the often disinfection methods used in the daily dental practice are efficacy and they assure correct bacteria control.

Key words: microbiology, disinfection, dental impression materials

 

3D PRINTED ORTHODONTIC RETAINERS

 

  1. Stoyanova*, Y. Stoev**, R. Grozdanova-Uzunova DMD, PhD ***
  2. Yordanova-Ignatova DMD, PhD****, V. Bogdanov DMD, PhD****, I. Taneva*****, T. Uzunov DMD, PhD******

 

Faculty of Dental Medicine 

Medical University – Sofia

Bulgaria

 

Introduction. 3D printing is a widely used technology, which finds its application in a wide variety of dental disciplines, including the production of different types of orthodontic appliances. The capabilities of modern digital methods enable the introduction and approbation of a new method for retention of the results from the orthodontic treatment via 3D printing from biocompatible materials. 

 

Aim. To introduce and approbate a method for production of orthodontic retention appliances by the means of stereolithographic 3D printing.

 

Material and Methods. For the study two different specialized 3D printers were used – NextDent® 5100 3D Printer and Form 2with their corresponding biocompatible materials – NextDent OrthoFlex and Formlabs Dental LT Clear V2. Specimens were also made via thermoforming using Erkodur foils and the Erkoform 3D+ machine. Optic properties were tested using a source of monochromatic light and a luxmeter. 

 

Results. A comparative analysis between the two equipment systems and their corresponding materials was done. Results, obtained from the tests with the luxmeter were statistically processed and analyzed. The transparency of materials for 3D printing, even after polishing, is statistically lower than that of thermoforming foils. 

 

Conclusion. 3D printing is a viable alternative method for production of orthodontic retainers, which allows for a faster clinical information transfer compared to the classically used thermoforming approach. The transparency of classical materials is superior to that of 3D printed ones.

 

Key words: retainers, 3D printing, stereolithography 

 

___________________________________________________________________________

* Specializing student in the Department of Prosthetic Dental Medicine, FDM, MU-Sofia

** Student in FDM, MU-Sofia

***Assistant professor in the Department of Conservative Dentistry, FDM, MU-Sofia

****Assistant professor in the Department of Orthodontics, FDM, MU-Sofia 

*****Assistant professor in the Department of Prosthetic Dental Medicine, FDM, MU-Sofia

******Associated professor in the Department of Prosthetic Dental Medicine, FDM, MU-Sofia

 

IMPACT OF DEMOGRAPHIC AND SOCIO-ECONOMIC FACTORS ON DENTAL HEALTH*

St. Nenov DMD, P. Bozhinov DMD, PhD, B. Bonev DMD, PhD

Department of Dental public health

Faculty of Dental Medicine

Medical University – Sofia

Bulgaria

Introduction. Dental health is a key indicator of overall health, well-being and quality of life of population. A number of demographic, socio-economic and behavioral factors influence dental status.

Aim. To establish impact of demographic and socio-economic factors on dental health of population.

Materials and methods. We develop a questionnaire with nineteen questions and conduct an inquiry and dental checkups among 416 Bulgarians in order to achieve the aim of research. They were compliant to ethics. The results were analyzed statistically.

Results. The prevalence of dental caries by people (Ep=98.56%) and by teeth (ET=52.7%), as well as the intensity (DMF=16.25) correlate to the trend of high levels of dental caries in Europe. Values are higher in women and elderly. Patients with better education and income, who visit dental office regularly, and those without systemic diseases have less extracted teeth (F). Positive aspect is that 66.83% of patients visit dental office at least once a year, which is higher than in other countries. It is worrying that 83.65% of patients have periodontal pathology with different severity, with significant varieties in the distribution of indicators of periodontal status of patients depending on age, systemic diseases, frequency of dental visits and self-assessment of dental health.

Conclusion. Demographic and socio-economic factors impact the dental and periodontal status of population. Improvement of the health culture, oral hygiene habits and compliance with the dental prophylactic regime are key to improving the oral status of the population.

Key words: demography, dental health, dental status, intensity (DMF), prevalence
* This study is part of a research project on the topic “Barriers for access to dental health related to patients and their impact on dental health”, funded by the program GRANT 2020 of the Medical University – Sofia.

 

BARRIERS FOR DENTAL HEALTH RELATED TO PATIENTS*

St. Nenov DMD, P. Bozhinov DMD, PhD, B. Bonev DMD, PhD

Department of Dental public health

Faculty of Dental Medicine

Medical University – Sofia

Bulgaria

Introduction. Dental health is an important part and indicator of overall human health. A number of psychosocial and behavioral factors associated with patients can be barriers for access to dental care.

Aim. To establish impact of barriers related to patients on dental health of population.

Materials and methods. Dental checkups and a survey to identify barriers for access to dental services were conducted among 416 Bulgarians in order to achieve the aim of the research. The results were analyzed statistically.

Results. Main barriers for access to dental care, according to patients, are related to them (67.09%), followed by barriers related to the state/society (28.09%) and related to dentists (4.01%). The complex impact of barriers related to patients (46.15%) is leading, followed by the lack of pain and subjective complaints (31.21%), fear of dental manipulations (16.67%) and cost of treatment (15.54%). The prevalence and intensity of dental caries, number of decayed, extracted and filled teeth, as well as the prevalence of periodontal diseases are higher among the patients with dental fear. Patients for whom the price is barrier have higher number of carious teeth. The prevalence and intensity of caries and periodontal diseases are higher among the patients who postpone a dental visit due to the lack of pain and subjective complaints.

Conclusion. Barriers for dental health related to patients impact their dental status. Knowledge of barriers and mechanisms to influence them can improve the level of dental health.

Key words: access, barriers, dental health, intensity (DMF), prevalence

 

* This study is part of a research project on the topic “Barriers for access to dental health related to patients and their impact on dental health”, funded by the program GRANT 2020 of the Medical University – Sofia.

 

BARRIERS FOR DENTAL HEALTH RELATED TO DENTAL PROFESSION*

St. Nenov DMD, B. Bonev DMD,PhD

Department of Public dental health

Faculty of Dental Medicine

Medical University – Sofia

    Introduction

    Dental health is an important part of general human health. Number of psycho-social factors act as barriers and can obstruct access to dental care for patients. 

Aim

To establish impact of barriers related to dental profession on dental health of population.

Materials and methods

We develop a questionnaire with twenty questions about barriers for dental health, and conduct an anonymous survey – directly and by internet among 138 dentists to accomplish the aim. The survey was compliant to ethics. The results were analyzed statically.

Results

Main barriers for access to dental care, according to dental professionals, are related to state/community (50.68%), followed by barriers related to patients (45.21%) and related to dental profession (4.11%). The main barrier related to dental profession is unregular geographic distribution of practices (71.74%). Other barriers are education (36.96%) and number (30.34%) of dentists inconsistent to the needs of the society and lack of sensitivity to patient’s needs (18.12%). Occupational stress (65.94%) is the main factor acting as a barrier to access by the dental profession, followed by financial factor (42.03%) and professional perception of patient’s treatment needs (26.81%). The most common effect of occupational stress is the development of Burn-out Syndrome by the dental practitioners (31.88%).

Conclusion

Barriers for dental health influence the use of dental services by the population. Knowledge of them, as well as mechanisms to influence them, can improve access and quality of dental health care.

    Key words:

Access to dental care, barriers, dental health, occupational stress

* This study is part of a research project under Decree № 90 / 26.05.2000, supplemented by Decree № 105 / 02.05.2019, on the topic “Impact of barriers for access to dental care by dental professionals” funded by the Medical University – Sofia.

 

MANUFACTURING OF RETAINER BY DIGITAL DESIGN AND DENTAL MILLING (CNC) MACHINING

Ph. Ivanov DMD, Vl. Petrunov DMD, PhD

Department of Orthodontics

Faculty of Dental Medicine

Medical University – Sofia

Bulgaria

Introduction. The rearrangment of the periodontic fibers after tooth movement leads to disbalance after the removal of the orhodontic appliances. The goal of retention is maintaing the teeth in their final position during the rearrangement of the periodontic fibers and minimilizing post treatment and growth changes. 0.0195” Musltistrand wires are used most commonly in clinical practice. CAD/CAM titanium retainers provide similar biological and superior mechanical qualities compared to multistrand wires.

Aim. The aim of this poster is to demonstrate the advantages of digital designed retainers manufactured by a milling (CNC) machine. 

Materials and methods. Models were scanned with SwingTM (DOF Inc.) laboratory scanner. Exocad Dental (Exocad GmbH). CAD software was used for construction design. The retainer was made of Titan Biostar °5 (SILADENT) alloy by 5 аxis Computer Numerical Control (CNC) milling machining.

Results. The result is the introduction of a manufacturing method which ensures precision and reduces clinical procedure time. Digital planning enhances model visualization and exact construction parameters setting. Thus, borders of the construction are accurately designed, considering the anatomic features and the clinical requirements. The method allows for the avoidance of possible technological errors and ensures great end-product precision. The precision of the construction guaranties its passiveness, facilitates the placement of the retainer solely using the viscosity of the flow composite and reduces the duration of the clinical procedure.

Conclusion. The use of the new dental construction design and manufacturing technologies results in reducing the manufacturing time, minimizing technological errors and increasing end-product precision. 

Key words: CAD/CAM, titanium, retainer, dental milling

 

COMPARATIVE STUDY OF THE PENETRATION OF AN INFILTRANT AND AN ADHESIVE INTO NON-CAVITATED PROXIMAL CARIES LESIONS

V.Todorova DMD, PhD, I. Filipov DMD, PhD

Department of Operative Dentistry and Endodontics

Faculty of Dental Medicine

Medical University – Plovdiv

Bulgaria

Introduction. Resin infiltration of non-cavitated proximal caries is a micro-invasive method for arrest of lesion progression.

Aim. Tо compare the penetration ability of an infiltrant (Icon, DMG) and an adhesive (Adper Single Bond 2, 3M) into natural non-cavitated proximal caries lesions. 

Materials and Мethods. Extracted human permanent premolars and molars with proximal non-cavitated carious white spot lesions were cut across the lesions perpendicular to the surface and lesion depth was examined with a stereomicroscope. The paired lesion halves were randomly allocated to be treated with either an infiltrant or an adhesive, preliminarily labeled with 0.1% of TRITC. Specimens were observed by confocal laser microscopy in dual fluorescence mode. Lesion depths, penetration depths and percentage of penetration were measured

Results. The infiltrant demonstrated significantly higher penetration ability (penetration depth 318 μm, percentage of penetration 49.78%) than the adhesive (penetration depth 57.69 μm, percentage of penetration 8.85%). 

Conclusion. Resin infiltration is a promising approach to arrest proximal caries progression.

Key words: adhesive, infiltrant, proximal caries

 

A FIVE-YEAR FOLLOW UP VESTIBULOPLASTY WITH XENOGENEIC GRAFT

  1. Dzhongova DMD, PhD, V. Georgieva DMD, I. Petrova DMD, I. Dimitrov DMD

Department of Oral Surgery

Faculty of Dental Medicine

Medical University – Varna
Bulgaria

Introduction. Vestibuloplasty is defined as corrective surgical procedure on the soft tissue of the alveolar ridge of upper and lower jaw.  Vestibuloplasty techniques with secondary epithelialization are often marked with a slow healing process, discomfort,  relapses, difficult in speaking and eating and reduced oral hygiene. It is, therefore, advisable to use grafts for covering the exposed wound surface in order to prevent the formation of exuberant granulation tissue and accelerate the healing process. The use of a xenogeneic graft for covering the exposed periosteum reduces the pain and discomfort of the operative wound and allows early prosthetic loading.

Aim. The aim of this study was to follow for 5 years the postoperative results of vestibuloplasty with xenogeneic graft.

Materials and methods. This study includes one female patient with an atrophic mandible who requires deepening of the vestibulum in the anterior region in order to improve the stability of the removable denture. The surgical procedure included local anesthesia, one horizontal incision in the mucogingival line and a partial-thickness flap elevation, which was sutured apically at the new position. The exposed periosteum was covered with a xenogeneic dermal graft Mucoderm®. The denture was made 10 days after vestibuloplasty. The follow-up period was 5 years, and after the 30th postoperative day, the patient was called for check-up once every 6 months.

Results and discussion.  The use of grafts to cover the periosteum enables the reduction of patient’s morbidity and facilitates dental impression and denture fabrication soon after vestibuloplasty.  The early prosthetic loading allows preservation of long-term postoperative results, prevent rigid scarring at the newly acquired vestibule.

Conclusion. This study showed that using a xenogeneic graft to cover exposed periosteum lead to obtaining stable and reliable results.

Key words: vestibuloplasty, xenogeneic graft, preprosthetic surgery

 

 MODEL FOR RISK MANAGEMENT IN DENTAL PRACTICES

Т. Petkova*, DMD;  N. Musurlieva*, DMD, PhD;  I. Popova*, DMD; K. Dimitrov, MD*

*Department of social medicine and public health; Faculty of public health; MU-Plovdiv; Bulgaria

 

Abstract:

         Quality control in the field of dental services is an important part of improving patient safety. The introduction of a risk management model would simplify and facilitate this process, as well as prevent medical errors.

         The aim of the study is to gather information about the organization of work processes in dental practice, which will serve to build a model of risk management.

        Material and methods: A direct anonymous survey was used. The questionnaire contains 30 questions. The primary information was processed and analyzed using the statistical program SPSS 20.0. Descriptive statistics and graphical analysis are attached. P <0.05 was considered to be significant for the null hypothesis.

       Results: The study involved 103 dentists, of whom 25.24% ± 4.28% have acquired a specialty. Women are 52.43% ± 4.92%, and men – 47.57% ± 4.92%. Most of the respondents do not define in writing the main tasks and activities – 52.43% ± 4.92%, and do not use checklists for checking – 54.73%. The majority do not hold regular meetings with the team – 50.49% ± 4.93%, as well as surveys among their patients on the quality of services – 68.93% ± 4.56%. The majority of respondents – 41.75% ± 4.86% are guided by their personal judgment, whether the written information provided to the patient is understandable and accessible. The majority of dentists – 45.63% ± 4.91% take informed consent only for expensive procedures – 53.40% ± 4.92%.

      Conclusions: It is necessary to conclude that dentists do not apply the prescriptions to avoid mistakes (keeping exact documentation, mandatory obtaining informed consent, etc.). Developing a risk management model would be useful to increase patient safety.

Key words: quality, management, risk, security, informed consent

Ticket to 31.05.2019

110

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140

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60

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