Quality of Endodontic Treatment and Prevalence of Apical Radiolucencies in a Bulgarian Subpopulation: a CBCT Analysis.

Introduction: The advent of Cone Beam Computed Tomography (CBCT) in endodontics has enhanced the diagnosis of periapical radiolucencies and the assessment of endodontically treated teeth.

Aim: The purpose of this study was to assess the prevalence of periapical radiolucencies in a Bulgarian subpopulation and the quality of previous endodontic treatment using CBCT scans.

Materials And Methods: This study included 2795 roots from 160 Large FOV CBCT which were evaluated by two independent examiners using two scoring systems: CBCT-PAI and PESS.

Effect of ageing and endodontic treatment on the thermal stability of human dentin.

Background: Human dentin is a highly calcified tissue of mesenchymal origin with a heterogeneous structure. Its morphology is constantly remodelled throughout the life span of the tooth, as well as under the influence of external stimuli.

Objective: The aim of the present study was to obtain information about the thermal changes in the crown and root dentin specimens of vital and devitalized teeth.

Clinical Assessment of Endodontically Treated Teeth, Restored with or without Radicular Posts.

Background: The reduced fracture resistance in endodontically treated teeth requires the use of radicular posts, with their advantages and disadvantages.

Aim: To evaluate the clinical performance of teeth restored with or without radicular posts at 6 and 12 months.

Materials And Methods: The study included 22 patients who received endodontic therapy on premolars with a loss of one or two proximal walls.

Clinical Effect of Dental Adhesive on Marginal Integrity in Class I And Class II Resin-Composite Restorations.

Background: Dental adhesives are believed to influence marginal adaptation and marginal discoloration when used under posterior resin-based composite restorations. Studies on the latest adhesive systems reveal that the group of the three-step etch-and-rinse adhesive (3-E&RA) and the one-step self-etch adhesive (1-SEA) have entirely different bonding mechanisms, as well as different bond strength and resistance to chemical, thermal and mechanical factors.

Study Objectives: A hypothesis that a 1-SEA would result in greater enamel marginal discoloration and poorer marginal adaptation than a 3-E&RA was tested.

Clinical Impact of Dental Adhesives on Postoperative Sensitivity in Class I and Class II Resin-Composite Restorations.

Background: Self-etch adhesives are believed to prevent postoperative sensitivity when used under posterior resin-based composite restorations.

Study Objective: A hypothesis that a one-step self-etch adhesive (1-SEA) would result in less postoperative sensitivity than a three-step etch-and-rinse adhesive (3-E&RA) was tested.

Patients And Methods: One hundred restorations were placed with a 1-SEA and 100 restorations with a 3-E&RA.

Clinical evaluation of restorations with self-etch adhesive and nanofilled composite in class I and class II cavities.

Introduction: In the era of adhesive restorative dentistry the principles of conventional cavity preparation have acquired a new meaning. The emphasis is shifted from "widening for preventive purposes" and preparation of macro-mechanical retention to "consciously limited" preparation. The clinical and biological durability of restorations depends on the adhesive bond and the quality of the composite material.

Evaluation of the accuracy of electronic apex locators Dentaport ZX and Ray Pex 4 under clinical conditions.

Aim: The aim of the present study was to compare the accuracy of working endodontic length determination by Dentaport ZX and Ray Pex 4 under clinical conditions.

Material And Methods: Clinical comparative evaluation of the accuracy of two electronic apex locators, Dentaport ZX and Ray-Pex 4, was carried out in 80 single-rooted teeth with vital pulp tissue planned for extraction as part of the dental treatment and after patient consent had been obtained. The normal procedure was followed, which included anesthesia, a standard endodontic access cavity, pulp removal and irrigation of the root canal with 5.

Early results of the use of ProRoot MT and Titan cement for furcation perforation repair--a comparative experimental study.

Unlabelled: The aim of the present experimental study was to follow up the connective tissue response after using ProRoot MTA and Titan cement to repair furcation perforations in dogs.

Material And Methods: Four animals aged 12 to 18 months were used in the study. Perforation defects were created in the center of the pulp chamber of mandibular premolars P2, P3 and P4, right and left.

Factors for post-operative sensitivity in dental caries treatment according to practicing dentists--application of network analysis.

Introduction: The postoperative tooth sensitivity is a dental caries post-treatment complication of unknown origin. The variety of clinical symptoms of this condition, the contributing factors and their interactions may be presented by means of network analysis.

Aim: The aim of the present study was to apply network analysis to present the relationships between factors contributing to post-operative sensitivity according to practicing dentists.

A study of post-operative sensitivity in class I and class II restorations with self-etching adhesive and nanofilled composite.

Aim: The aim of the study was to determine the type, intensity and duration of post operative sensitivity (POS) in class I and II cavity restorations with self-etching adhesive and nanofilled composite.

Patients And Methods: The clinical study included 34 patients, who received a total of 76 restorations by undergraduate dental students. The restorations were made in medium and deep cavities.

Residual monomer in a composite resin after light-curing with different sources, light intensities and spectra of radiation.

The purpose of this study was to investigate the amount of residual monomer in a composite resin after light-curing with different sources, light intensities and spectra of radiation. The resin specimens (4 mm in diameter; 2 mm thick) (n=5) were inserted in Plexglass matrixes and light-cured with a halogen lamp, LED and PAC units for 40, 40 and 5 s, respectively. The polymerized specimens were ground and 25 mg of each specimen were immersed in 8 mL 96% ethanol for 24 h to extract the residual monomer.

The smear layer in the root canal and its removal.

Instrumentation of the root canal during endodontic treatment produces a smear layer which is not uniformly attached to the canal wall. Its morphological structure comprises dentin particles, organic debris, odontoblast processes, microorganisms and their metabolic products. The view that has currently gained wide popularity holds that leaving the smear layer in the root canal contradicts the principles of efficient treatment as this might compromise the optimal progression of the healing process.

Effectiveness and ergonomic features of different light sources for polymerization of composite resin materials.

Introduction: Besides the halogen curing lights, already accepted as standard equipment, diode and plasma-arc units for polymerization of filling materials have also been commercially available in Bulgaria in recent years. The present study was prompted by the lack of detailed scientific information about these novel light curing devices.

Aim: 1.