Stefan Zlatev

Medical University of Plovdiv · Department of Prosthetic Dentistry

UV photofunctionalization of Zirconia-based materials for abutment fabrication is a promising approach that might influence the formation of a sound peri-implant seal, thus promoting long-term soft and hard tissue implant integration. This study aimed to evaluate the effect of UV treatment of test specimens made by two different ZnO2-based ceramic...

Over recent years, the usage of autologous platelet concentrates (APCs) has risen in hard tissue regeneration and oral implantology. The purpose of the present review is to offer an overview of the use of three APC techniques in dentistry: platelet-rich plasma (PRP), platelet-rich fibrin (PRF), and concentrated growth factor (CGF). A narrative summ...

This study investigated the colour stability of three dimensional (3D)-printed and conventional denture teeth after immersion in different colourants. A total of 60 artificial maxillary central incisors were selected from three types of materials: 3D-printed dental resin (NextDent, 3D Systems, Soesterberg, The Netherlands), prefabricated acrylic te...

Aim: The aim of the present research is to establish the frequency and methods of cleaning used by patients with complete dentures. Material and Methods: A survey was conducted between 2016 and 2019 among 96 patients (54 female and 42 male). This study was carried out at the faculty of dental medicine, Medical University – Sofia, during the student...

Aim: The aim of the present research is to assess the distribution of the alveolar ridge height (ARH) and compare the values obtained intraorally and from plaster, master-casts poured from two-step final impressions. Materials and methods: For the purpose of this study, 96 patients aged 49-88 were examined between 2016-2019. The research was conduc...

Aim: The aim of the present research is to characterize the morphological features of the upper and lower jaws in cases of completely edentulous patients. Materials and methods: For the purpose of this study, 96 patients aged 49-88 were examined between 2016-2019. The research was conducted during the practical classes in prosthetic dental medicine...

Here we review the knowledge on the local biological immunological response (formation of “pseudo periosteum” of the host) to two types of nonresorbable membranes used in the horizontal and vertical alveolar ridge augmentation: the titanium-reinforced polytetrafluoroethylene membrane and the titanium mesh membrane. A literature search was conducted...

Aim: The aim of the present research is to establish the frequency and methods of cleaning used by patients with complete dentures. Material and Methods: A survey was conducted between 2016 and 2019 among 96 patients (54 female and 42 male). This study was carried out at the faculty of dental medicine, Medical University-Sofia, during the students'...

Introduction: Guided single implant placement ensures an optimal implant position, enables in-surgery immediate loading, and creates a predisposition for predictable treatment results. Aim: This article aims to present the surgical and loading protocols and assess the accuracy of two guided implant systems. Materials and methods: Ten patients missi...

The aim of the current study was to evaluate the dimensional changes and ultimate tensile strength in three polyamide materials for denture bases fabrication through injection molding, subjected to artificial aging and different storage conditions. A total of 333 test specimens fabricated from Biosens (BS; Perflex, Netanya, Israel), Bre.flex 2nd ed...

The aim of the present clinical study was to assess and compare the histomorphometric results and efficacy of freeze-dried bone allograft (FDBA) in combination with platelet-rich fibrin (PRF), and PRF as a sole grafting material for socket preservation. Ninety patients in need of tooth extraction and implant restoration were included in this study....

Background: This study aims to evaluate whether there is a correlation between implant stability, bone density, vital bone formation and implant diameter and length. Methods: Ninety patients were enrolled in this study. They underwent a socket preservation procedure with allograft or PRF and after 4 months, a total of 90 implants were placed. CB...

Recreating the location and profile of the translucent zone, especially in the esthetic area of the dentition, has an increasing significance in contemporary aesthetic dentistry. The purpose of the current study is to compare the methods of spectrophotometry and transillumination in the visualization of the translucent zone in maxillary incisors. N...

Introduction: Sufficient bone volume, as well as the bone quality characteristics are necessary prerequisites to ensure optimal mechanical stability of the implants and subsequent osseointegration. Aim: The aim of the present study was to assess the correlation between bone density values obtained by cone-beam computed tomography (CBCT), the pri...

Background: The stability of peri-implant tissues, especially the marginal bonelevel in tilted implants restoredwith single crowns has not been investigatedextensively. The currentstudyaims to determine the potential influence of implant inclination on peri-implant marginal bonelossafter 12 months of functionalloading. Materials and Methods: The st...

The aim of the article is to present a narrative review of the literature related to the different shade guides available for dental practitioners. A literature search was performed in the online databases – PubMed, Science Direct, MedLine and GoogleScholar with the following keywords – shade guide, shade matching, dental, dentistry. Furthermore, a...

Purpose: The aim of this randomized controlled clinical trial was to evaluate the efficacy of A-PRF alone or in combination with freeze-dried bone allograft in improving vital bone formation and decreasing alveolar bone resorption. Materials and methods: The study included 60 patients with 63 post-extraction sockets. They were divided into three gr...

Introduction: Nowadays, there is a variety of different retraction methods. Dentists must be well informed about them, so that they can choose the proper one according to the clinical case. The aim of the current study is to compare the postretractional changes in the gingival height after 3 classical mechano-chemical retraction methods – a retract...

The retraction methods are divided in two main groups - classical mechano-chemical and surgical. The first one includes single - cord and the double - cord technique, whereas the second one includes electrosurgery, rotary curettage, and laser retraction.

Introduction: Nowadays, there is a variety of different retraction methods. Dentists must be well informed about them, so that they can choose the proper one according to the clinical case. The aim of the current study is to compare the postretractional changes in the gingival height after 3 classical surgical retraction methods – rotary curettage...

The initial tissue response after conventional gingivectomy is forming a coagulum. The total healing process lasts two weeks, whereas the final restoration of the epithelium takes about a month. The healing process when using a laser device is per secundam intentionem. It is faster and more predictable than the conventional one. Key words: healing,...

The aim of this study was to compare two different methods for evaluation of alveolar bone resorption after the socket preservation procedure. In the current study, 9 patients with a total of nine teeth indicated for extraction were included. Patients received alveolar ridge preservation with allograft (BoneAlbumin™, OrthoSera Dental, Gyor, Hungary...

Aim: The aim of the research is to make an analysis of the most often FDM-Sofia students’ errors in the partial dentures fabrication process. Materials and methods: A number of 155 partial dentures were analysed after the practical exam of the 2nd year FDM-Sofia students. Some of the basic fabrication errors were analysed such as; proper resin pol...

Background: Gingivectomy is a procedure often performed in everyday clinical practice using numerous instruments. Aim: To evaluate and compare the gingival cut surface after gingivectomy with 6 different surgical instruments – a surgical scalpel, an Er:YAG laser, a CO 2 laser, a ceramic bur, an electrocautery device, and a diode laser. Materials an...

Introduction: A drastic increase in the number of published medical papers per year is observed. This makes the identification, analysis and categorization of significant studies a difficult task. Natural (human) Language Processing and text mining are methods, part of the scientific branch computer linguistics that transfer the informational overl...

Introduction: The endocrown is a mean for restoring endodontically treated teeth. It has a circumferential preparation with a butt-joint border and accessory retention within the pulp chamber. It does not require root preparation for placement of posts or post and cores making it a more conservative restoration that evades the shortcomings of the a...

In contemporary dentistry, a successful restoration should not only restore the shape and function of the impaired dentition, but also contribute to the overall aesthetic appearance. In order to achieve this goal, the dental team should possess complete information about the different optical dimensions of the tooth structure. Besides the standard...

Background:Tooth extraction is one of the most common procedures in the dental practice. The treatment of the extraction site is a daily challenge, which influences the post-extraction bone resorption. Purpose:The purpose of the current short communication is to showcase a novel methodology for volumetric evaluation of bone resorption after tooth e...

The aim of the current investigation is to analyze the dental-technicians’ awareness of the soft relining materials, their characteristics, advantages, shortcomings and methods for relining. Materials and methods: For the purpose of this investigation a standard questionnaire has been presented. A direct survey method, documentary and statistical m...

Despite the achievements of modern dentistry in fields of implantology and CAD-CAM technologies, the challenges associated with edentulous patients, treatment are still remaining. Difficulties are getting even greater, when it is a matter of highly atrophied alveolar ridges, covered with very thin mucosa, people suffering from xerostomia, exostosis...

Introduction: Cementation is the final stage in clinical cases restored with FPD’s. Since the introduction of CAD/CAM technology a rapid increase in the usage of constructions based on zirconium dioxide is observed. This material and its modifications may require a different cementation protocol. Purpose: The aim of the current review of the litera...

Introduction: The coincidence between the midline of the face and the dental midline is of great clinical significance and can determine the successful outcome of a restorative treatment. Different assessment methods are proposed, but the majority of them are noninvasive, utilizing standardized facial photographs. Purpose: The aim of the current st...

Увод: При сложни протетични случаи свързани с пълна рехабилитация на съзъбието, често са загубени ориентирите за форма и големина. Възстановяването на такива дефекти разчита на използване на различни антропометрични ориентири – биоконстанти, които не се повлияват от загубата на зъбите както и от други фактори, като например възраст. Цел: Целта на н...

Introduction: The endocrown is a mean for restoring endodontically treated teeth, which has a circumferential preparation with a butt-joint border and accessory retention within the pulp chamber. Objectives: Evaluation of the clinical performance and longevity of three-unit FPD with endocrown preparation for the distal abutment tooth and comparison...

Objective: The main goal of dentistry is to restore the impaired form, function and esthetics of the single tooth, the dental arch and the dentition. The clinical work includes the application of different biomaterials to treat impairments, which are various in natures. The system tooth-biomaterial is subjected to masticatory forces, thermal and...

Objectives: The purpose of this study was to investigate the functional stress distributions of dentin-post interfaces in a three-dimensional finite element (3D FE) model of a human upper premolar with various types of metal and fiberglass post systems. Methods: The human upper premolar was digitized with a micro-CT scanner with a resolution of 0...

Objective: The objective of this in vitro study was to determine the functional stress distribution of a pontic-teeth interface with different designs of the preparation and the construction. Method: Two human teeth – a premolar and a molar were digitized using a micro-CT scanner with a resolution of 0.625 mm. A 3D solid model was prepared an...