Oral Rehabilitation Therapies in A Patient with Facial Dysmorphia and Psychiatric Profile - Clinical Case Report

This article describes rehabilitation of one case, complex psychiatric treatment, facial asimetry, with mandibular and maxilla missing teeth and dental disharmony, with a fixed and also removable hybrid prosthesis. Rehabilitation with fixed or removable prosthesis is even more challenging when the edentulous span is long and the ridge is irregular deformities and unfavorable biomechanics encountered at the prosthetic field for complex rehabilitation.In such situation, a fixed-removable prosthesis allows favorable biomechanical stress distribution along with restoration of esthetics, phonetics, comfort, hygiene, and better postoperative care and maintenance</em

INFLUENCE OF FINISHING TECHNIQUES OF TI-BASED ALLOYS USED IN PROSTHETIC RESTORATIONS ON THE FORMATION OF CANDIDA ALBICANS BIOFILM

Surface roughness plays an important role in the formation of specific oral cavity biofilm. The paper aims at analyzing the influence of mechanical finishing techniques on the formation of Candida albicans biofilms. We studied two different Ti-based alloys used in prosthetic restorations and two finishing techniques: mechanical polishing with rubber polisher and mechanical polishing with cotton polisher and polishing paste. Examinations on roughness have made reference to Rz. The ability to adhere and to form the Candida albicans biofilms onto the rough surfaces of the studied samples was highlighted by scanning electron microscopy (SEM). Microbiological analysis indicates the strong relationship between the surface quality of dental alloys used in prosthetic restorations and the ability of the fungal pathogen of Candida albicans type to adhere to these metal surfaces

COMPARATIVE STUDY REGARDING THE MICRO-HARDNESS OF SOME AESTHETIC RESTORATIVE MATERIALS

Background In recent years and mainly after 2000, the trends in terms of the structure of dental composites have addressed the progressive decrease of filler particle size down to nanometric level. All these result from the need to continuously improve the properties of the composite material such as their hardness, mechanical resilience, contraction to polymerization and polymerization stress. The present study aimed to test the microhardness and to determine its variation in case of some coronary esthetic restorative materials commonly used in dental practice. Material and methods Experimental researches concerning the determination of the microhardness variations were performed on four direct dental restorative light-curing composite (Herculite XRV Ultra, Synergy D6 and Brilliant - nanohybrid composite and Latelux -microhybrid composite). Specimens, with a diameter of 10 × 10 mm and 4 mm thick, were developed in the Dental Materials laboratory of the Dental Medicine Faculty of "Gr. T. Popa " University of Medicine and Pharmacy of Iasi, in accordance with the manufacturer indications. Micro-hardness testing was performed in the Department of Material Engineering and Industrial Security of the Faculty of Materials Science and Engineering from “Gheorghe Asachi” Techncial University of Iaşi. Results Tests have revealed that direct composite resin Brilliant from Coltene Whaledent presents the highest values of Vickers micro-hardness. Conclusions For the selection and use of direct composite resins dentist must take into account the composition, clinical performance, handling characteristics and their biomechanical behavior, an important parameter being the micro-hardness

RESEARCHES REGARDING THE PROFILE OF THE FINISHED SURFACES OF SOME DIRECT LIGHT CURED COMPOSITE MATERIALS

Introduction. The composite resins are the most commonly used materials in dentistry. In recent years, researchers have turned their interest to the studies on quality parameters of dental biomaterials. Goal. The investigations on surface quality aimed at highlighting roughness variations corresponding to the samples of various direct coronary restorative materials whose finishing was achieved by mechanical polishing. Material and method. For this research we used 3 light-curing composite materials of nanohybrid type (Herculite, Synergy D6 and Brilliant). Specimens were made in the laboratory of Dental Materials within the Faculty of Dental Medicine, “Gr. T. Popa” University of Medicine and Pharmacy of Iaşi. The surfaces finished by polishing were subjected to imaging tests and experimental measurements at nanoscale by using Nanosurf Easy Scan 2 AFM atomic force microscopy system. Results and discussion. The experimental researches carried out to determine the nanometer profile of each surface revealed the 3D image of the topography obtained after finishing by polishing, the nanometric profile of the midline corresponding to the investigated area, the 2D image obtained by deflection of the analysed surface. Conclusions. The determination of nanometric profile of surfaces through investigations carried out by atomic force microscopy (AFM) is a way of highlighting the microrelief topography resulted at the end of finishing by polishing. After polishing with abrasive gums, the nanometric profile having the smallest size (268.3nm) was obtained for Brilliant material. After having analyzed the dispersion of the values of total size of the nanometric profile for the three direct coronal restorative materials under study, we may notice that dispersion intervals have close limits, the lowest interval being characteristic to the surfaces obtained with Herculite and Brilliant commercial products

STUDY REGARDING THE BEHAVIOUR OF CERTAIN DIRECT DIACRYLIC COMPOSITE RESINS TO ELECTROCHEMICAL CORROSION IN AFNOR ARTIFICIAL SALIVA

Currently the most frequently class of materials used in the dental office for the remake of coronary morphofunctionality is that of diacrylic-composite resins. This study aimed at highlighting the behaviour of certain direct diacrylic composite resins having a different polymerization type of matrix monomers to electrochemical corrosion in artificial saliva. The specimens made of Charisma, Charisma PPF-Heraeus-Kulzer were immersed in Afnor solution for a period of 40 days and analysed by electronic microscopy and EDS chemical analysis. The results of the study show that following the process of electrochemical corrosion on both materials under study, we may notice a decrease of the percentage of carbon, silica and zirconium simultaneously with the increase of the oxygen percentage and the formation of new sodium and chlorine-based chemical compound

PREDICTIVE ANALYSIS OF SURFACE QUALITY-CANDIDA ALBICANS BIOFILM RELATIONS

Introduction The theoretical researches conducted aimed at determining the mathematic relations of functional dependence among three variable parameters: medium rugosity (Rz), the number of colony forming units (CFU) and the medium thickness of fungal cell layer ( ) characterizing the formation and growth of Candida albicans biofilm. Material and methods The influence of the finishing techniques was materialized by medium rugosity (Rz) measured for each polished surface whereas the process of formation and growth of cellular biofilms was highlighted by parameters (CFU) and ( ) whose values were determined by electronic microscopy SEM. The functional dependence among the three variables taken into consideration: (Rz, UFC and ) in case of the nonnoble dental alloy was solved by using Mathematica 8.0 programme. Results The analysis of real regression surface shows that the observance of the interdependence relation between Rz, UFC and parameters shall occur for values of Rz = 0.72...2.65 µm, to which shall correspond medium thicknesses of the cellular layer = 19.7…28.8 µm. Similarly, from the regression surface of the predictive values it results that the satisfaction of the regression function shall occur for values of Rz = 0.98...2.47 µm, whereas for parameter we will have the value interval: 17.8...23.6 µm. Conclusions For the samples of Kera N alloy under study, all theoretical values obtained by predictive analysis for the variable parameters Rz, CFU and show that the finishing techniques applied to the surfaces of metal components of prosthetic restorations shall exert their influence on the formation and growth of Candida albicans biofilms

MODERN THERAPEUTICAL POSSIBILITIES TO SOLVE THE UNITERMINAL EDENTATION

Introduction Currently, cushioned hinge is one of the recommended solutions for solving mandibular or maxillar uniterminale edentations. Aim of the study This work presents some practical prosthetic possibilities of solving mandibular or maxillar uniterminale edentations. Material and methods The study was conducted on a total of nine patients, aged between 32-48 years, who presented partial uniterminale edentation. To solve uniterminale edentation was used Ancorvis system (damped hinge). Results In all clinical situations solved by using the Ancorvis system was obtain optimal morpho-functional rehabilitation of the stomatognathic system. Conclusions Currently, rehabilitation of uniterminale edentations is possible by using prosthetic appliances that do not affect the marginal periodontium of the remaining teeth. Unilaterale prosthetic appliances with Ancorvis clamping system is successfully used in the terminale edentation therapy. Such prostheses have the advantage of a small gauge, which makes them comfortable. For the success of treatment it is necessary a perfect collaboration between dentist and dental technician

The subjects of the offenses to the norms on safety and health at work and the social and organizational effects specific to companies conducting mining activities

The offenses concerning safety and health at work have no material object, their constitutive content including: the object and subject of the offense, the objective and subjective side of the offense. The active subjects of an offense have a legal obligation to apply and control the implementation of occupational safety and health measures and the passive subjects will bear the consequences of the occurrence of specific events. The existence of some uncertainties in the current legislation, also affecting mining companies, creates legal disputes especially in relation to the issues concerning active subjects. As for the passive subjects, the legal loophole refers to the situation of the day-labourers who may be involved in accidents at work and occupational illnesses. The authors consider it is necessary to formulate new law articles for clarification and even to draw up a future law with concrete reference to day-labourers, but also to some new risk sensitive social groups. Thus, the egal work relationships: the manner of performing the work, its remuneration and subordination to the beneficiary carrying out mining activities, will also be specified

MONITORING THE BEHAVIOUR OF KERA N ALLOY TO CORROSION IN AFNOR ARTIFICIAL SALIVA

Corrosion consists in the degradation of a material under the chemical or electrochemical action of the environment in which it is placed. The investigations carried out aimed at showing the behaviour of KERA N (Eisenbacher Dental – Waren ED GmbH, Germany) alloy to corrosion in AFNOR artificial saliva. In this study we used the linear polarization method at different scanning speeds and the cyclical polarization method. The corrosion potentials for Kera N alloy under study vary depending on the scanning speed of the potential between -927.5mV and -516 mV. From the cyclical polarization tests we noticed that the Ni-based alloy, Kera N (Eisenbacher Dental – Waren ED GmbH, Germany) shows a generalized corrosion type without the tendency to form pitting type corrosion

REABILITAREA PROTETICA A PACIENTILOR CU MODIFICARI ALE SUPORTULUI MUCO –OSOS SI DENTO-PARODONTAL

Oral rehabilitation involves complex procedures, especially when the edentation is biterminal. The loss of occlusal surfaces leads to important changes on the dento-periodontal and muco-osseous level that is also associated with the collapse of the occlusal vertical dimension and the modification of the centric relation landmarks.Aim The study is focused on detecting the complex oral rehabilitation methods in the case of extended partial edentation, as well as customizing the therapeutic algorithm depending on local and loco-regional factors and the clinical aspects that may influence the final therapeutic option.Material and method The evaluation of the therapeutic algorithm as part of the complex oral rehabilitation of partial edentulous patients has been performed focusing on the comparative aspects between various therapeutic solutions, explaining and correlating the positive, respectively the negative morphofunctional aspects which influence the oral rehabilitation solution. Results and discussions In order to obtain a complex oral rehabilitation, the functions of the stomatognathic system must be restored so as to result in compatibility between the aspect of the oral tissues and the rehabilitation solution. The partial removable dentures must be compatible from biological and physiological point of view with the elements of the prosthetic field and must restore the esthetical function. Conclusions The variety of the therapeutic alternatives must observe the patient’s requirements and the local biological aspect