18, June 2022
16:00 – 18:00
Speakers

Oral presentations

ADVANTAGES OF CBCT IMAGING IN TREATMENT OF CASES INVOLVING HYPERDONTIA

M.Grancharov DMD, G. Gurgurova DMD, Greta Yordanova- Kostova DMD, PhD

Orthodontic Department

Faculty of Dental Medicine

Medical University – Sofia

Bulgaria

 

Introduction. Supernumerary teeth develop in addition to the normal set of teeth and can be morphologically normal or abnormal in structure, characteristics and location. Traditional radiographic examinations are usually limited to two-dimensional images that have captured using radiographic film or digital sensors. Prior to the development of 3-dimensional Cone Beam Computed Tomography (CBCT), determining the location of impacted supernumerary teeth could been approximated with multiple types of x-ray imaging, conducted in different plains.

Aim. The aim of this article is to provide a comprehensive overview of CBCT imaging advantages in cases of impacted supernumerary teeth. 

Materials and Methods. In our research we compare results from 2D and 3D images of patients with impacted supernumerary teeth. We present several cases, analyse their x-ray readings and the information, provided by that method. A plan for orthodontic-surgical treatment is prepared, based on the data of the OPG and CBCT images. 

Results. In the presented cases the exact location and morphology of the impacted teeth are discovered only by using CBCT imaging. It enables accurate differential diagnosis between hyperdontia and geminated teeth.  OPG x-rays provide approximate location in medio-distal and vertical direction, but no information about tooth morphology. The CBCT images were used in the placement planning of the mini implants, utilized in the treatments and for surgical access, compliant with the anatomy of the lower jaw, for the extraction of lower molars. 

Conclusion.  The information obtained from CBCT significantly changed the initial treatment plan in some cases.  

Key words: CBCT, hyperdontia, impacted teeth

 

ADVANTAGES IN INTRAORAL SCANNING IN ORTHODONTICS

  1. Gurgurova DMD, M. Grancharov DMD, G. Yordanova- Kostova DMD, PhD

Orthodontic Department

Faculty of Dental Medicine

Medical University – Sofia

Bulgaria

Introduction. The orthodontic digital record of the patients makes following the separate cases and the access to medical documentation fast and possible from different dental offices.

Aim. The aim of our research is to study the attitude of the patients for using the digital methods in orthodontic practice.

Materials and methods. We use the digital documentation of 159 orthodontically treated patients. All of them has both conventional alginate impressions and digital models’ trough intraoral scanning. 27 from the patients are treated with CAD/CAM printed orthodontic appliances. The patients fill questionaries made by our team with increasing 10-scala system. The data is statistically processed.

Results. Almost all of the patients corroborate the process of digital orthodontic card – 96.80%, because there is no need to remember the manipulations and their coming tracing. The feeling of all objects is that alginate impressions take more time than 3D scanning and if they have the opportunity to choose only one procedure 73.58% will choose intraoral scanning. All of the patients treated with digital made appliances evaluate the process of appliance fixing and adaptation (without adjusting phase) with full miss of discomfort.

Conclusion. The intraoral scanning give opportunity for digitalizing the patients records and make the interdisciplinary approach and communication between the specialists fast, precise and descriptive. The patients evaluate the 3D scanning method as innovative and contemporary. Now the space for keeping the patients’ impressions is digital cloud, not physical space. The process of making digital planned appliances decrease the possibility of technological and human mistake.

Key words: intraoral scanning, STL files, conventional alginate impressions

 

AN INTERRELATION BETWEEN PROINFLAMMATORY CYTOKINES AND PERIODONTITIS

  1. Pashova-Tasseva DMD, А. Mlachkova DMD, PhD

Department of Periodontology

Faculty of Dental Medicine

Medical University – Sofia

Bulgaria

Introduction. The initiation of the periodontal disease is related to the presence of pathogenic microbiota that induces local and systemic inflammatory response. The presence of periodontal pathogens is not sufficient for a destructive process to appear. The host response is involved in the development of the clinical course of the disease. This is why determination of susceptible to periodontitis individuals is important – for screening, prevention and control of the disease.

Aim. To establish an interrelation between single nucleotide polymorphisms of IL-23 and IL-17F and periodontitis in a Bulgarian population. 

Materials and Methods. 83 tested individuals took part in the investigation – 62 patients with moderate and severe periodontitis and 21 individuals with periodontal health. To all of them a detailed periodontal diagnosis and RFLP-PCR for the both polymorphisms were made. 

Results. In regard to SNP of IL-23 a presence of two genotypes was established – GG and GA. About the SNP of IL-17F the results revealed the presence of three genotypes – ТТ, СТ and СС. No significance about a relation between the investigated polymorphisms and the severity of periodontitis was found. A pattern for a severe course of periodontitis in patients with TT genotype of IL-17F SNP was established. 

Conclusion. Within the limitations of the study due to the small tested sample our results cannot be absolutized. Tendencies about a severe course of the periodontal disease in some genotypes have been established. 

Key words: periodontitis, single genetic polymorphisms, IL-17F, IL-23.

 

MUCOGINGIVAL PROBLEMS –TREATMENT STRATEGIES 

А.Мlachkova PhD, Z.Pashova-Tasseva DMD

Department of Periodontology

Faculty of Dental Medicine

Medical University – Sofia

Bulgaria

Introduction. The presence of insufficient attached gingiva combined with gingival recession and shallow vestibule is related to functional and aesthetic problems. Their surgical correction provides a long term clinical solution. 

Aim. Discussion about different approaches for elimination of the mucogingival problems. 

Materials and methods: Demonstration of six clinical cases with insufficient attached gingiva, gingival recessions and aberrant frenum attachments and their resolution by the means of different surgical techniques such as free gingival graft, coronal advanced flap with/without connective tissue graft, frenectоmy.  

Results. The correction of the mucogingival problems facilitates the personal plaque control and improves aesthetic and function (2 to 5 years maintenance). 

Conclusion. The utilisation of grafts is adequate surgical method for treatment of shallow vestibule and insufficient attached gingiva and leads to widening of the zone of keratinised tissues, improving the plaque control and arresting the gingival recessions. The elimination of aberrant frenum attachments favour the oral hygiene of the patient. 

Key words: mucogingival surgery, mucogingival problems 

 

APPLICATION OF TELESCOPIC CROWNS FOR PARTIAL DENTURES  (QUESTIONNAIRE SURVEY)

M.Urumova DMD, G.Todorov DMD, PhD, St.Zlatev DMD, PhD

Department of Prosthetic Dentistry

Faculty of Dental Medicine 

Medical University – Plovdiv

Bulgaria

Introduction. There are used different elements to retain and stabilize partial dentures. Precision retentive attachments have different design in technological and clinical aspect, in order to achieve effective functional and esthetic results.

Aim. The survey aims to present the opinion of dentists in Bulgaria, regarding the treatment with a telescopic crown.

Material and Methods. The survey was conducted in the period January-July 2018 with a total of 208 dentists from different regions of Bulgaria. Each participant completed a quastionaire with 8 questions about work experiance, age, speciality and application in dental practice. The results were statistically processed. Processing includes scripting and graphical methods. There were used Pearson test and Rop-Scot modification.

Results. According to the survey, 8% of dentists apply double crowns for partial dentures. 11% did not use this type of precision element in their practice. However, 42% of the respondents said that is superior to their special means, and 28% of the respondents with over 21 years of age observed stabilization of the supporting teeth.

Conclusion. According to the survey, few dentists use these precision retainers in their practice. The low rate of application of these elements is considered to be due to the insufficient knowledge of the respondents regarding the technological and clinical features of the telescope crowns.

Key words: telescope crowns, partial denture, application in dental practice

 

TELESCOPIC CROWNS WITH ADDITIONAL RETENTIVE ELEMENTS. 

A CLINICAL CASE

M.Urumova DMD

Department of Prosthetic Dentistry

Faculty of Dental Medicine 

Medical University – Plovdiv

Bulgaria 

Introduction. Many types of retentive systems are used in removable partial dentures. One of them is the telescope crowns. As a precise support and retention element, telescope crowns provide good retention and stability of the prosthesis.

Aim. Presentation of a clinical case in which a removable partial prosthesis of the lower jaw was made with complex-attachment – telescopic crowns with additional retentive elements.

 Materials and Methods. A 62-year-old patient was complaining of difficulty eating. To date, no prostheses have been made for the patient. A removable partial denture with wire clasps on the upper jaw and a telescopic-denture on the mandible were made, and the telescopic crowns were made with a modified design.

Results. The clinically tested method, which includes additional retentive elements, leads to very good retention, stability, and good function in telescope crowns. During the follow-up examinations, the patient reported that she felt stability, good function and retention of the new prosthesis.

Conclusion. Telescopic overdentures have better retention and stability as compared to complete dentures. They improve the chewing efficiency and the comfort of the patient and they also decrease the alveolar bone resorption.

Keywords: telescopic crowns, retention, removable partial dentures

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