Title of the article: Shear bond strength evaluation of resin composite bonded to three different liners - Theracal LC, Biodentine and Resin modified glass ionomer cement using universal adhesive: An in vitro study.
Abstract:
Aims: To compare and evaluate the bonding ability of resin composite (RC) to three different liners - Theracal LC (TLC) a novel resin modified calcium silicate cement, Biodentine (BD) and resin modified glass ionomer cement(RMGIC) using an universal silane containing adhesive and characterizing their failure modes.
Methods and Material: Thirty extracted intact human molars with occlusal cavity (6-mm diameter and 2-mm height) were mounted in acrylic blocks and divided into three groups of 10 samples each based on the liner used as Group A (TLC) Group B (BD) and Group C (RMGIC). Composite post of 3mm
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Gandolfi MG et al 11 studied on chemical, physical properties of TLC and reported more calcium release than Pro-Root MTA and Dycal. It was reported that calcium silicate based materials showed apatite formation at a faster rate than calcium hydroxide based materials.12 However, there are contradictory findings reported in literature about the hydration characteristics of TLC.13 The role of moisture drawn in from the pulp and dentin is also unclear. TLC shows physio- chemical bonding to dentin and is well tolerated by immortalized odontoblast cells 14. Recently, Cantekin K15 proved that the bond strength of Theracal – methacrylate based composite was significantly higher than that with silorane-based composites and glass-ionomer cement. Currently, there is limited information in the literature on bonding ability of TLC to RC in comparison with other
In comparing micro-leakage of resin-modified glass-ionomers (RMGI), flowable composite liners, and no liners, it was found that by applying a RMGI liner before placing the composite decreased the extent of micro-leakage3. By doing this, the farthest the micro-leakage occurred was to the cervical wall, whereas with composite liners and no liners there was leakage to the cervical wall and into the axial wall3. The reason for the difference could be attributed to the bond between the glass ionomer and composite. This bond is weak and can be thought of as an unbounded wall, leading to less shrinkage stress to the bonds between composite and dentin3.
...at more tentatively, with fluoride gels and varnishes or a chlorhexidine varnish. Some dentists may restore root caries with amalgam restorations. Another treatment option used by some dentists to restore root caries is Glass Ionomer Cements. Glass ionomer cements were first introduced in the early 1970s. They have good adherence to mineralized tooth tissue, which keeps the removal of tooth structure to a minimum. Glass ionomer cements also have the ability to leak and absorb fluoride into the tooth, which decreases the rate of secondary caries. These factors have increased the potential for glass ionomer cements to replace amalgam as a restorative material. (Hammel)
Tooth surfaces are referred to by various names in dentistry, including mesial, distal, buccal, and lingual. If you drew a midline t...
Ceramics have high hardness and wear resistance, making them suitable for applications such as the articulating surfaces in joints and bone bonding surfaces in implants. Ceramics like alumina and zirconia are more appropriate to use in joint replacements and dentistry whereas hydroxyapatite or calcium phosphate cements are useful for bone bonding applications which is assist with bone growth and implant integration with surrounding natural bone and tissues (http://www.azom.com/article.aspx?ArticleID=108).
Everyone has teeth, and society likes them to be as white as possible. But does everyone know the parts of the tooth? The tooth has four parts: dental pulp, dentin, enamel, and cementumcentenum. Dental pulp is the center part of the tooth and is made of tissue and nerves. Dentin is connected to the dental pulp and is the second hardest part of the tooth. Enamel is the hard, outer layer that surrounds the tooth. Enamel cannot be repaired or replaced. One can only prevent its loss, which is why we brush our teeth so often to help eliminate the plaque and acids that certain sodas and other sugary drinks try so hard to remove. Without enamel, teeth would erode within days of their coming in. And last but not least, cementumcentenum. CementumCentenum covers the root of the tooth and it anchors the root to the skin.
After the treatment and procedure is complete, patients leave with healthier, more beautiful teeth, giving them the confidence to ask someone out on a date or the confidence to smile on an important job interview. Dentistry is and has been for centuries, an important aspect of people’s ...
Tooth enamel is a hard mineral substance that covers your teeth. Without this special coating, your teeth will decay and erode. In fact, mineral is found inside your body, especially in your bones. This is the same chemical makeup that you can expect to find in large mammals like whales. If you read on, you’ll find that the main ingredient in mineral is hydroxyapatite, a ceramic biomaterial made of calcium phosphate.
...an be seen that composite teeth form a high stability bond than PMMA teeth. This is due to the filler content allowing for low shrinkage, increased wear resistance and better cross-linkage with the base. In overall consensus the technique of heat-curing is believed to achieve significantly more polymer cross-linkage than that of self-curing the acrylic resin PMMA base - giving us a stronger base to teeth interface. It should be noted however that both techniques can be used for denture fabrication to achieve a desired result and it is up to the dentist and the technician to determine which one they prefer however, composite teeth bonded to a heat-cured PMMA base works best. Though the tooth and base by themselves may be strong, if the interface between them is not strong, this will result in the overall denture produced being weak independent of material selection.
The existence of micro-leakage in dental restorations was first identified in scientific research in 19126. In a study done by Harper (1912), air pressure was used to penetrate the surface between an amalgam restoration and cavity preparation7. By applying pressure through a hole in the pulpal floor, Harper could quantify the amount of pressure needed to establish leakage through the emergence of bubbles from the margins of the restoration. Research has come a long way since Harper first recognized micro-leakage. Adaptations of new materials used when placing composite restorations like BondAband, a light-cured glass-ionomer cement has been shown to reduce marginal micro-leakage in posterior restorations8. A decrease in microleakage has also been shown with the use of an ...
According to major supplies, “Use of synthetic fibers for reinforcing concrete is continuously, increasing. The increase has been considerable since 1980, but slowed somewhat in 1990, a year of substantial construction cutbacks. Apparently the construction community believes there are advantages in the use of synthetic fibers in concrete.” (Schupack) Synthetic fibers are used to improve crack control in concrete. Some reports say that synthetic fiber reinforced concrete (SFRC) would replace welded wire fabric in many slab-on-grade applications. But in reality if the welded wire fabric is placed properly it controls crack width better than the synthetic fiber reinforced concrete. In a case study of the use of synthetic fibers in reinforced concrete, the following conclusions were obtained. No matter what concrete placing job is being done, there is no substitute for good concrete practices. The use of a low fiber volume mix will help control plastic shrinkage cracks and bleeding, but not give good cracking control once the crack forms. The synthetic fibers running through a crack have a poor bond providing no shear friction. Impact and toughness tests on synthetic fiber reinforced concrete imply less edge spalling will occur. The American Concrete Institute (ACI) conducted two studies on polypropylene fiber reinforced concrete, one dealing with plastic shrinkage cracking and the other on permeability characteristics. Plastic shrinkage cracking occurs when the surface water on the concrete evaporates faster than the bleed water reaches the surface of the concrete. It was determined by the plastic shrinking cracking study that polypropylene fibers helped reduce the total plastic shrinkage crack area on test panels. Also determined is that the screeding rate affects the total crack area in polypropylene reinforced concrete, while finishing operations showed no significant effects. This study also suggests the use of longer fibers (about 0.75in.) will produce less crack area. “Permeability plays an important role in long-term durability of concrete materials. Permeability of concrete generally refers to the rate at which particular aggressive substances (water, sulfates, chloride ions, etc.) can flow through the concrete.” (Soroushian) As discussed in the plastic shrinkage study that polypropylene fibers reduce cracking. Less cracking in the concrete surface that surface would be less permeable. In the permeability study, they concentrated on the effects of chloride and the permeability of the concrete. The results of this study concluded polypropylene fibers had little effects on chloride permeability of concrete. The polypropylene fibers only help reduce plastic shrinkage cracks.
While conducting the dissection, only four teeth were observed in the specimen, which consisted of the two incisors on the top, and two on the bottom. However, subsequent to the dissection it was noted that rats possess 16 teeth consisting of both incisors and molars (website 3, 2004). Humans possess 32 teeth that consist of 12 molars, of which four are wisdom teeth. Nowadays, several people are getting their wisdom teeth removed, which is somewhat due to the fact that they have become “useless” throughout the years. Modern diets consist of softer foods, which have eliminated the purpose of wisdom teeth that were once distinct (website 4, 2007). However, due to the rat’s diet consisting of “rough” foods, all 12 of its molars are useful in providing more “chewing power”, and force. Another difference that was between the rat and the human that was observed in the dissection was the size of the caecum (see figure1). One of the main purposes of the caecum is to digest cellulose. Rats
Polyethylene (PE) is one of the most commonly used polymers which can be identified into two plastic identification codes: 2 for high-density polyethylene (HDPE) and 4 for low density polyethylene (LDPE). Polyethylene is sometimes called polyethene or polythene and is produced by an addition polymerisation reaction. The chemical formula for polyethylene is –(CH2-CH2)n– for both HDPE and LDPE. The formation of the polyethylene chain is created with the monomer ethylene (CH2=CH2).
Dental plaque is broadly classified as supragingival or subgingival based on its position on the tooth surface toward the gingival margin. Supragingival plaque is found at or above the gingival margin. Therefore, it can be further differentiated into coronal plaque, whi...
Lee decided to organize her book in a way that her readers will understand both chronologically and also putting it into a format that shows a whirlwind of emotions from anger to happiness and even showing compassion, so that people will connect how the world was and how it reflected on society. Lee might have created one of the turning points of this time period. She was raised by her father ,who Lee looked up to and valued his opinion and advice more than anything. To Kill a Mockingbird definitely shows the type of person she was raised to be, which was to be understanding and listen and learn to and from others because, everyone has a different story and a different background. This is shown in a lot of the characters like at the Radley
Cosmetic dentistry is a specialized field that deals with improving the aesthetics of teeth and the human face. The teeth are an important part of human beauty. Even minor damage to the teeth, such as breakage or loss can drastically alter the overall appearance of the face. This is where cosmetic dentistry comes in to restore beauty. Cosmetic dentistry has become a highly specialized branch due to various advancements in surgical procedures and diagnostic techniques. Several new materials have also been discovered. These materials are very close to the natural enamel and bone from which teeth are made and are virtually indistinguishable. Cosmetic dentistry is an option in conditions such as teeth loss, gaps between teeth, cracked or chipped teeth, cavities and dental