Irina Tsenova-Ilieva

Medical University of Sofia · Department of Conservative Dentistry

A bstract Aim The objective of this in vitro micro-computed tomography investigation is to assess the efficacy of the ProTaper Universal Retreatment System in retreating oval-shaped root canals filled with three obturation procedures. Materials and Methods Thirty-six lower incisors with a single oval root canal were prepared using XP-Endo Shaper...

Background During the course of a non-surgical orthograde endodontic retreatment, supplementary instrumentation is usually required for better removal of root canal filling material. Aim The aim of this study was to assess the effectiveness of XP-Endo Finisher R in endodontic retreatment of oval root canals. Materials and Methods The study was pe...

Remaining root dentin thickness plays a key role in the longevity of endodontically treated teeth. Purpose: The aim of this study was to compare the root canal wall thickness in the danger zones of mandibular incisors before and after their instrumentation with two different NiTi rotary systems by means of CBCT. Methodology: Thirty lower incisors o...

Background: Removal of the root canal filling material in the course of the endodontic retreatment is achieved by the use of various instruments and techniques. Purpose: The aim of this article is to systematically analyze published in vitro investigations over a five-year period of time (2018-2022), assessing the efficacy of the XP-Endo Finisher R...

The main goal of orthograde root canal retreatment is to completely remove the root canal content and chemically treat the residual infection. Purpose: The aim of this study was to evaluate the effectiveness of D-Race retreatment files supplemented with XP-Endo Finisher R in the removal of root canal filling material from oval-shaped canals. Method...

Еndodontic irrigants could alter the mechanical properties of root canal dentin. The aim of the current study was tо compare the effect of three irrigation protocols on root canal dentin microhardness and roughness with respect to their concentration and additional ultrasonic activation for the same treatment period. Forty single-rooted, intact upp...

Background: Endodontic irrigants could alter the mechanical properties of root canal dentin, such as its roughness. Aim: To compare the effect of various irrigation protocols on root canal dentin roughness with respect to their application time, concentration, and additional ultrasonic activation. Materials and methods: Forty single-rooted, no...

The aim of the study was to assess the effect of different experimental conditions on registration of microcracks by means of micro-computed tomography. Twenty roots of permanent lower incisors were instrumented with SAF system, filled with a single-cone technique and retreated with the Pro Taper Universal Retreatment system. Each sample was measur...

Introduction: The proper cleaning and reshaping of the root canal space is of great importance for the good outcome of the retreatment case. None of the different methods and instruments used for filling material removal during endodontic retreatment exhibit 100% effectiveness. Aim: The aim of the current review article is to observe the contempora...

Purpose: The aim of this in vitro study was to evaluate the effect of different irrigation regimens of root dentin microhardness. Materials and methods: Twenty extracted, single-rooted, non-endodontically treated upper incisors were decoronated and further sectioned longitudinally in buccolingual direction. The surfaces of all forty samples were po...

Purpose: The aim of the current study was to assess the dentinal damage after shaping of oval-shaped root canals of lower incisors with SAF by means of micro-computed tomography. Materials and methods: Twenty single-rooted, non-endodontically treated lower incisors with straight roots were included in the experiment. The specimens were scanned usin...

Removal of the organic and inorganic components of the smear layer in the course of the endodontic treatment is achieved by the use of different endodontic irrigants. Despite their favorable disinfection abilities, they are reported to alter the biomechanical properties of root canal dentin. The aim of this article is to critically review published...

Atomic force microscopy provides a detailed characterization of various dental tissues and processes in the nanometric scale. It is currently applied in dental investigations focused on demineralization of dental hard tissues, observation of dentinal surface and collagen network, bacterial cells and biofilms, dental materials and appliances, etc. R...

Purpose: The aim of the present study was to compare the quality of preparation of oval-shaped canals by using SAF, XP-endo Shaper and hand instruments. Materials and methods: Sixty freshly extracted lower incisors were selected and randomly assigned into three equal groups. All samples were preflared with hand K-files, filled with a radiopaque con...

Purpose: The objective of the present study was to evaluate the ability of two nickel-titanium rotary systems made of different alloys to induce dentinal radicular microcracks Materials and methods: Thirty – six extracted lower incisors were included in the current in vitro experiment. The samples were randomly assigned into three equal groups (n=1...

Background: A lot of studies are focused on the ability of nickel-titanium engine-driven files to induce dentinal radicular microcracks. A recently developed single-file system is reported to shape the root canal system less aggressively without damaging the integrity of dentinal matrix. Objective: The aim of the current study was to assess the fre...

Introduction. A growing interest from investigators and practitioners have been registered in assessing patients’ quality of life and satisfaction with effectiveness of provided dental care. Specific treatment-related satisfaction measures have been introduced to recognize individuals’ perceptions of root canal treatment outcomes. Methods. Two hund...

Everyday life of individuals can be significantly influenced by positive and negative changes in oral health status, by symptoms and severity of oral disorders and diseases. The World Health Organization (WHO) proclaims a necessity to measure health and the effects of health care not only on the basis of changes in the frequency and severity of dis...

Everyday life of individuals can be significantly influenced by positive and negative changes in oral health status, by symptoms and severity of oral disorders and diseases. The World Health Organization (WHO) proclaims a necessity to measure health and the effects of health care not only on the basis of changes in the frequency and severity of dis...

Introduction: During the past decade micro-computed tomography has evolved into one of the most precise experimental tools in in vitro endodontic laboratory examinations. It is a non-invasive methodology that enables detailed and reproducible assessment of the root canal system prior to and in the course of the endodontic treatment. Aim: The aim of...

The objective of the present study was to evaluate the formation of microcracks after root canal filling with thermoplasticized gutta-percha. Thirty freshly extracted mandibular premolars were selected and evenly distributed into three groups (n=10): negative control, BT - Race (positive control), GuttaCore. Roots in the negative control group were...

Purpose: The objective of the present study was to evaluate the incidence of microcracks after root canal preparation with two reciprocating systems. Materials and methods: Thirty – six freshly extracted mandibular incisors were selected for this in vitro study. The samples were allocated in three groups (n=12): negative control, Reciproc, WaveOne...

This review article focuses on some of the factors leading to damages of radicular dentin in the course of different root canal filling techniques and retreatment procedures. Conflicting results in literature exist regarding the effect of single-cone obturation, cold lateral condensation and thermomechanical compaction of gutta-percha in terms of s...

The ability of nickel-titanium rotary instruments to initiate dentinal defects during root canal shaping is contradictory. The type of their alloy, taper, tip design, cross-section and kinematics are analyzed in terms of generating unfavorable stress onto the root canal wall. Along with their positive characteristics, some of the most common irriga...