Compomers:introduction Compomers are composites modified with polyacid groups and are used for restorations in low stress baring areas, however a recent product (Dyract,AP) is recommended by the manufacturer for use in class 1 and 2 restorations in adults. Shortly after the introduction of resin modified glass ionomer cements(RMGICs) compomers were introduced to the market. They were marketed as a new class of dental materials that would provide combined benefits of composites (hence the”comp”in their name)and glass ionomers (omer).These materials have two main constituents : dimethacrylate monomer(s) with two carboxylic groups present in their structure and a filler that is similar to the ion-leachable glass present in glass ionomers (fluoride …show more content…
Factors as bulimia, gastric acid reflux,acidic medicines and frequent acidic diet exposure represent significant factors in the development of dental erosion(Machado C&Lacefield W,2008). The global increase in the ingestion of acidic beverages such as soft drinks and fruit juices is one of the main causes of high prevalence of dental erosion (Khmverdiz &Mohammed V,2013). Tooth colored direct restorations are often used in erosive lesions for dentin and enamel rehabilitation .physical and chemical properties of dental filling materials are indicators that predict their performance in a clinical setting .The roughening of the surface caused by wear and chemical degradation may affect gloss and consequently increase plaque retention, thus decreasing the longevity of the restoration (Lepri CP&Palma-Dibb RG,2013). Therefore failure or success of aesthetic restorations depends on their behavior under still persisting erosive conditions. The critical oral environment conditions, i.e. PH changes and humidity may increase dental materials biodegradation over time (Valinoti AC& Neves BG,2008). This is a complex process that may lead a composite, glass ionomer or compomer poly matrix to collapse, causing several problems such as a filler-polymer matrix debonding , release of residual monomers(Ruyter IE,1996). …show more content…
Resin- modified glass ionomers and copomers have a local and adverse systemic effects. These effects can be caused by substances that are released from resinous materials after polymerization(E.S Tunc&S Sari,2009) . Studies on degradation of on dental materials have confirmed the release of substances such as 2-hydroyethyl methacrylate ( HEMA) and triethylene glycol dimethacrylate (TEGDMA)from resin- based dental materials(S.A Mazzaoui&M.FBurrow,2002). HEMA and TEGDMA are a likely cause of cellular stress via formation of reactive oxygen species (ROS) . Demirci et al found a possible link between ROS production and cytotoxic activity. Moreover the induction of genotoxic effects of HEMA and TEGDMA have been demonstrated in vitro as well, indicating the compounds’ DNA reactivity(H.Schweikl . In addition , resin materials have been shown to cause cytoxicity and elevated numbers of micronuclei . Geurtsen et al .showed that elution of TEGDMA was one of the causes of the cytotoxic reactions evoked by light –cured glass ionomer cements and compomers they investigated. Thus this comonomer’s escape /liberation from resin restorations should be minimized or prevented. For many years ,halogen light-curing units (LCUs) were preferred as the most practical method for polymerizing light-cured resin. Composition of the
A little rate of the populace is hypersensitive to amalgam and there is likewise prove that it might assume a part in oral lichen planus, a by and large generous and moderately unprecedented turmoil. In my practice, I utilize tooth shaded fillings called composite sap for a large portion of my patients since I think it is prevalent from multiple points of view, however regardless I utilize amalgam every so often. A study in the April 2006 version of the Journal of the American Medical Association demonstrated that amalgam fillings had no negative effect on kids (http://jama.ama-assn.org/cgi/content/short/295/15/1784). Truth be told, despite everything I have amalgam fillings in my own mouth, and can guarantee you that I rest soundly around evening
Chronic periodontitis Chronic Periodontitis is an inflammatory disease of the supporting tissues of the teeth caused by specific microorganisms or groups of specific microorganisms, leading to progressive destruction of the attachment apparatus of the teeth including periodontal ligament, cementum and alveolar bone with periodontal pocket formation, and recession of the gingival tissue(1) . The clinical feature that characterizes periodontitis from gingivitis is the presence of clinically apparent attachment loss. This loss mainly is associated with changes in the density and height of subjacent alveolar bone (1). Severe generalized periodontitis affects 5–15% of any population worldwide and is a major cause of teeth loss after dental caries (2). Chronic Periodontitis also known as adult periodontitis or chronic adult
The methacrylate based, light cured, unfilled resin is perfect for filling small voids in the restoration. It gives the restoration a great seal which prevents any future leakage or failure. Before placing Permaseal, the restoration must be etched using the same phosphoric acid used earlier. After placing a thin layer, it is polymerized using the curing light and finally polished. The other two occlusal preps were similarly restored.
After conducting my experiment for approximately a week and a half I discovered that apple cider vinegar & extra virgin olive oil was the best natural substance to whiten teeth. I can concluded that our hypothesis was
(Orthodontics) West Chester, PA Invisalign Short-Term Orthodontics If you are in need of orthodontic treatment, we can help. Dr. Sykora and his staff are highly trained to provide excellent dental and orthodontic care to patients in need. Our short-term orthodontic solution can help you achieve the results you want without the hassle and lengthy treatment times of traditional orthodontics. Read on to learn more about how orthodontic treatment can improve your smile and what we can do to help.
There are several fluoride vehicles that can be used and take the form of varnishes, pastes, gels, foams and mouth rinses. The main goal of the clinician is the find the best treatment option for the patient based on their health history and vulnerability to oral disease. Through the use of journals such as Medline and the Cochrane Library, a panel of experts were able to develop a summary table that can be used as a chair side resource to the clinician. This aids in the dental clinician’s decision making and whether or not to use topical fluoride based on the patient’s health and the practioners’ own expertise.
The motivation, passion, and the internal will to want to succeed in life has always dwelled within me, so ultimately, all I needed was to find what interest me in life. In the beginning, I found myself staring down the road of becoming a teacher or dental hygienist. At first the idea of becoming a teacher seemed like a prominent, and fulfilling job. I get to convey knowledge to groups of young individuals, I also get to work in a setting with other mature adults who share my passion, and I have the opportunity to work with children; but, ultimately, there was just one main component missing for me, and that was the hands-on aspect. I told myself that I wanted to be involved in a career that is very hands-on.
The aim of the experiment was to test different types of soft drink on calcium carbonate marble chips, which were used in place of human teeth, and record what percentage of the marble chips dissolved when it was left in the soft drink overnight. These results will show which of the five soft drinks tested was the most harmful, and the ingredients will be examined to explain why the particular soft drink was the most detrimental to human teeth. Human teeth are covered in a hard substance called tooth enamel, which is made of hydroxyapatite. Enamel is the hardest tissue in the body and is vital in protecting teeth from decay (Callison, 2018). Enamel erosion occurs when acids wear away at the teeth and can result in painful temperature sensitivity, discolouration, cracks and chips, and indentations appearing on the teeth, and will result in cavities (Smith, 2013).
the polymeric structure or filler content, and surface roughness play a decisive role in the extent of discoloration caused by diverse substances. The amount of colour change is influenced by a number of factors such as oral hygiene, water sorption, and incomplete polymerization. As to the color stability of ceramic brackets, it has been reported that both polycrystalline and monocrystalline ceramic brackets resist staining or discoloration from the chemical substance likely to be encountered in the mouth; However, ceramic brackets in the oral cavity can be affected by color pigments in tea, coffee, other coloured drinks and mouth
Abstract New copolymeric membranes was offered for the efficient delivery of antibiotic drug using the synthesized chitosan–copoly(semicarbazide–formaldehyde–phenylhydrazine) blend membranes. The membranes were prepared by solution casting technique and characterized by elemental, spectral and scanning electron microscopy to establish the chemical structure and morphology. Scanning electron microscopy clearly reveals that the increased porosity in the polymeric network enables rapid swelling; leads to faster diffusion which facilitates effective drug release. The composition of chitosan content also governs the swelling behavior i.e. increased chitosan content showed excellent swelling behavior leads to profound drug delivery.
This technology allows certified dental technicians to provide restorations on a computer screen, which makes the job easier. The fabricated material can be done in a single appointment and there is no need for temporaries afterwards. Some studies have also demonstrated that CAD/CAM restorations are stronger and less likely to fracture than the milled ones from traditional techniques (Kotrzewski). This type of dental technology is available to produce crowns, veneers, and bridges, which helps to improve oral appearance. The use of the digital impressions disregards some laboratory steps, which leads to a faster and more effective product.