Abstract: In this study urethane dimethacrylate (UDMA) based dental resin materials were synthesized. Urethane methacrylate oligomers (UDMO) were synthesized via a radical chain growth polymerization mechanism using polyethylene glycol (PEG) in order to improve the mechanical properties, without adding a solvent in the reaction medium. The structure of the new monomer and oligomer were confirmed by FT-IR and 1H-NMR spectra. The results of FT-IR analysis indicated that the addition of PEG as plasticizer in the urethane methacrylate dental material in the adequate molar ratio (isophorone diisocyanate : HEM (2-hydroxyethyl methacrylate) : PEG = 2:2:1) improve the isocyanate double bond consumption. The Elastic strength (MPa) and Young’s Modulus of bending (MPa) were measured using a three-point bending set up. Urethane dimethacrylate monomer without PEG was used as control group. The results showed that PEG containing UDMO resins had lower Young’s Modulus: 2984 MPa and 2537 MPa (for 40s irradiation time) and Elastic strenght: 77 MPa and 51 MPa than UDMA derived resin: 3270 MPa respectively 90 MPa for all irradiation times (20 and 40 seconds).
Abstract: The management of traumatic dental caries in primary teeth has the main objective to avoid their consequences that can affect the immediate and longterm quality of life of the child. Aggressive forms of decays can develop on smooth surfaces of teeth and progress rapidly, the effect being detrimental on the dentition. The objective of this study was to compare the stress and displacement distributions in the models of two assemblies by means of the three-dimensional finite element analysis: deciduous maxillary lateral incisor - restorative filling – bone structure and deciduous mandibular lateral incisor – restorative filling – bone structure respectively. Both models were subjected to a 120 N static load applied on the upper surface. The models were built from computed-tomography scans. Two different restorative dental materials were considered. In addition, the results obtained were compared with previous research of the authors, i.e. the mechanical behavior of a deciduous restored molar and deciduous restored canine respectively. As a result of the study, it can be concluded that the biomechanical analysis of deciduous dental caries is a valuable aid in enabling the dentist to make correct and effective treatment decisions.
Abstract: The aim of this study was to investigate the interface ultrastructure at dentin and hybrid layer formed by novel adhesives with TiO2 nano-fillers. Nano-fillers have shown outstanding mechanical properties and they are widely used as reinforcing materials associated with polymeric matrices for high performance applications. Twenty extracted non carious human teeth were utilized for evaluation of the bonded interface using scanning electron microscopy. The experiments used four novel adhesives (noted A1, A2, A3, A4). Phosphoric acid (5s, 37%) and a commercial resin composite Herculite XRV (Kerr) filling were used for the surface treatment. The interface was studies using scanning electron microscopy (SEM) using a microscope Inspect F-FEI Company. The experimental results indicated the main benefits and disadvantages of the investigated adhesives systems. SEM of the adhesive dentin interface revealed a HAp (hydroxyapatite) – rich and homogenous hybrid layer. This layer produced a favourable sealing of damaged dentin.
Abstract: The present study reports the analytical approaches for characterization of teeth whitening gels based on natural extracts of fruits and medicinal plant. High performance liquid chromatography (HPLC) with UV detection were used for identification and quantification of (oxalic, citric, tartaric, malic, succinic and fumaric acids), flavonoids (catechin, epicatechin, rutin and quercetin) and phenolic acids (vanillic acid, p-coumaric acid, ferullic acid) from studied gels samples used for teeth whitening. The organic acids were used as active agent with action in tooth discoloration and stain removal. Organic acids were separated through a Carbosep Coregel 87H3 column at 35°C and detection at 214 nm. The mobile phase was the sulphuric acid 0.005 M solution. The total quantity of organic acids of these gel samples was determined. The action of flavonoids have controlled dental caries and inhibited plaque formation. Separation of flavonoids and phenolic acids was carried out on Lichrosorb RP-C18 column at 40 oC and detection at 290 nm. The mobile phase was a mixture of methanol and solution 0.1% formic acid in a gradient elution. The flavonoids, catechin, epicatechin, rutin and quercetin and phenolic acids, vanillic acid, p-coumaric acid, ferullic acid, were determined quantitative in the teeth whitening gels on natural extracts of fruits and medicinal plant.
Abstract: Cranioplasty of frontal skull defects are used for cosmetic reasons, helping correct disfigurement, but also play a critical role in protecting intracranial content from exposure and compression. Modern surgical management is based on principles of craniofacial surgery such as early one-stage repair- if possible, exposure of all fracture fragments by well-sited cosmetic incisions, precise internal fixation and definitive soft tissue management. The choice of surgical approach depends on fracture severity, complexity, patient comorbidities, and surgeon preference and experience. In large skull defects, titanium mesh reconstruction offers good alternative to other biomaterials by eliminating the time consuming task of contour moulding. The aim of the study is to provide a comprehensive review of aesthetic and functional outcomes, involving titanium mesh implants associated with native bone reconstruction of frontal area posttraumatic defects. Also, the article is related to the authors own experience, in treating several patients with posttraumatic deformity of the frontal bone, assessing forehead contour aesthetics, pain, nerve function and late cerebral complications. A retrospective study was conducted using records from 14 adult patients, between 21-74 years of age, who underwent reconstruction of depressed frontal bone fractures, by receiving titanium mesh implants, between February 2013- October 2015. All patients had a minimum follow up of 5 months by clinical examination and periodic CT-scans. In order to evaluate the experimental results we follow different clinical parameters than late complications, like facial nerve function, cosmetic outcome, and pain. According our clinical results, titanium mesh is an effective method of forehead reconstruction, which provides predictably good long term results.
Abstract: Endodontic retreatment with direct crown access is the main choice in cases of endodontic treatment failure, even if the practitioner`s effort and duration is significantly greater compared with other procedures. The retreatment with crown access repeats root canal treatment through direct access at the level of tooth crown. The objective is to clean up the canal from irritant agents, such as microorganisms, surviving from the previous therapy or passed through afterwards. Thus, a treatment restart is in accordance with the logics of root canal therapy and is preferred at any time if possible. The aim of this study was to observe, over a 4-year span, the efficiency of endodontic retreatment with direct coronary approach. From 2012 to 2016, 148 patients, with ages ranging from 18 to 65 years, were retreated endodontically. All patients were included in a regular monitoring plan of 3 months and 1-year post treatment. X-rays were performed during these observations, assessed with Orstavik criteria (1991), each radiography having assigned a periapical index (PeriApical Index – PAI). In conclusion, this study confirms that first choice of retreatment in case of endodontic treatment failure is restarting of the retreatment with direct crown access (91% success rate), failure of which leads to a surgical approach using endodontic microsurgery techniques.
Abstract: Anodontia or dental agenesis in children is difficult to treat, as the child is smaller. The treatment of anodontia is a complex one, it is important to mention that the children’s body is upgrowing and, also, the psychological implications that could appear in children without teeth. The materials used in acrylic infantile overdenture must be non-toxic and shouldn’t have any negative influence in upgrowing children. The base of acrylic infantile overdenture is made of acrylic resin. The aim of the present study is to highlight the changing of regular acrylic infantile overdenture, at the age of 1 and a half, in order to allow the physiological growth of the children’s bones.
Abstract: Stress incontinence is a major social and health problem for middle-aged and elderly women, with an increasing prevalence as life expectancy increases. Reconstructive surgery techniques using vaginal mesh slings of polypropylene (synthetic grafts) have diversified in recent years, but at the same time various postoperative complications have been reported, among the frequent ones being pelvic pain, thigh pain and dyspareunia. The pain mechanism is not fully understood, but pathophysiological theories describe the pain as closely related to the structure, density, size and elasticity of the vaginal mesh, and the inflammatory response of the host.
Abstract: With the increasing number of births by Caesarean section a new pathology has made its presence felt, linked to the scarring of the low uterine transverse incision. It was found that after the birth by caesarean section some patients presented postmenstrual prolonged bleeding, spotting, pelvic pain and infertility. First described in 1995, the isthmocele is a healing defect in the anterior wall of the lower uterine segment at the caesarean hysterotomy site. This faulty scarring could be attributed to physiological peculiarities of the patient, to the suturing technique or ascribed to tissue reaction specifically to the type of suture material used. We found that it may be a correlation between the suture materials used and the appearance of the isthmocele. There are no large studies that asses the long-term outcome of C-section scar on prolonged menstrual bleeding, spotting and infertility and no comparison on the rate of appearance of this pathology by account of the suture material.