INTRODUCTION Resin composite restorations are becoming have had a significant increase in popularity over the last few decades, and have become the patient’s preferred choice in filling material, due mainly due to their enhanced esthetics when compared to other restorations, as well as their ever-increasing durability. These factors have led to a large increase in demand from patients.1 As patient demand for this restorative material increases, so too do patient expectations for comfort and longevity in these restorations. An idyllic filling material would combine these effects with a perfect marginal seal, leaving no gap between the tooth structure and the restoration.2 According to a study by Stockton et al., “Imperfect bonding leaves a microscopic gap that allows the infiltration of bacteria, fluids, molecules and ions between the restoration and the tooth structure, commonly referred to as micro-leakage.”2 This gap is created by way of composite shrinkage during the process of polymerization, or “from mismatches between either the coefficients of thermal expansion of the tooth and the composite or between the elastic moduli of the tooth and the composite.”2 Most composite restorations will result in some level of micro-leakage, however the pulp of the tooth can withstand a small amount of leakage and remove the ions and fluid that make it through by way of the tooth’s own blood flow. If the leakage is significant enough, however, sensitivity, marginal discoloration3, and secondary caries can result, leading to possible failure of the restoration.2, CAUSES OF MICROLEAKAGE As previously stated, micro-leakage is mainly caused by shrinkage of the composite during polymerization. Bulk curing of composite results in a greater leve... ... middle of paper ... ...ku MN, Neme AL, Linger JB, Pink FE, Walker S. Effect of pre-heating resin composite on restoration microleakage. Oper Dent. 2008; 33(1);72-8. YELLOW 5. Giachetti L, Russo DS, Bambi C, Nieri M, Bertini F. Influence of operator skill on microleakege of total-etch and self-etch bonding systems. J Dent 2008; 36:49-53. BLUE 6. Yazici AR, Keles A, Tuncer D, Baseren M. Effect of prerestorative home-bleaching on microleakage of self-etch adhesives. J Comp 2010; 22(3);186-192. PINK 7. Gharizadeh N, Moradi K, Haghighizadeh MH. A study of microleakage in class II composite restorations using four different curing techniques. Oper Dent. 2007; 32(4);336-340. GREY 8. Cenci MS, Venturini D, Demarco FF, Camacho GB, Powers, JM. Effect of polishing techniques and time on surface roughness, hardness and microleakage of resin composite restorations. Oper Dent. 2006; 31(1),11-7. ORANGE
Afshar H, Jafari A, Khami M, et al. Evaluation of Microleakage in Composite-Composite and Amalgam-Composite Interfaces in Tooth with Preventive Resin Restoration. Journal of Dentistry 2012; 9(2):128-34.
Ceramics are most commonly used in dental applications as restorative materials for crowns, cements and dentures.
Dr. Gary Silva and his team are highly trained and experienced in providing restorations for all sorts of dental issues. We offer complete and partial dentures, tooth-colored fillings, crowns, bridges, and more. Dr. Silva’s unique background gave him real restorative experience early in his career. For more than 20 years, Dr. Silva has been offering patients the chance to gain a beautiful, functional smile with his restorative dentistry.
Service life The effect of fillers on polymers is that they are very beneficial because they don’t get ruined for a long time. Glass fillers are the most commonly used fillers in polymers. This is because they last longer and their service life is longer.
3) Describe the rationale and demonstrate how to chart existing restorations (amalgam, composite, gold, crowns, bridges, other), missing teeth, incipient caries and caries.
...because the residual oxygen from the whitening gels created an oxygen-inhibited layer. It is recommended that clinicians delay the placement of bonded restorations until 1-3 weeks after treatment (Can-Karabulut et al 2011).
... teeth was 79% and 65% in the permanent first molars. The arrest rate for caries on both permanent and primary teeth was 77%. In comparison, a study done on children in Greenland, the arrest rate for dentinal caries applied with just NaF varnish was only 33%(Ekstrand, et al; 2010)
The future of dentistry is the end of the use of amalgam restorations. Amalgam restorations are believed to be the cause of many illnesses for dental professionals. Dental professionals are exposed daily to the harmful chemicals contained in the material that makes up amalgam, including mercury. With the advent of resin restorations and their more popular use, amalgam restorations will be a thing of the past, only read about in dental history books.
These include nylon resin material, acrylic resin and metal. They use metal covered in plastic with plastic teeth for making partial dentures.
Denture teeth can be made of acrylic poly(methyl methacrylate) (PMMA) or composite resins. PMMA is a polymer - a material made the from joining of methyl methacrylate monomers. Properties of PMMA include resistance to abrasion, chemical stability and a high boiling point. (Jun Shen et al. 2011). However, weak flexure and impact strength of PMMA are of concern as they account for denture failure. (Bolayir G, Boztug A and Soygun K. 2013). Composite denture teeth are made of a three distinct phases - filler, matrix and coupling agents. Out of the types of composite teeth available, nano-filled composite teeth are preferred. Composite teeth have a PMMA coating around the tooth and a high content of filler particles. This gives them strength, higher resistance to forces than acrylic teeth and provides compete polymerization due to the PMMA coating. (Anusavice, K. J., Phillips, R. W., Shen, C., & Rawls, H. R, 2012). If the interface between the PMMA denture base and PMMA or composite teeth was weak, the denture will not be able to sustain occlusal forces, making the base-teeth interface, an entity of significance.
Abnormal wear of tooth surfaces was an orthodontic problem early on, even ancient people wanted straight teeth! To close gaps, it has been construed that catgut did the work now done by today’s orthodontic wire. In 400-500 BC, Hippocrates and Aristotle both ruminated about ways to level teeth and fix many dental conditions. It should be noted that in Medieval times, expert barbers often performed dental “operations”, extractions, and procedures such as blood-letting. In seventeen twenty-eight, French Dentist Pierre Fauchard published a book called “The Surgeon Dentist” about ways to straighten and align teeth. He used a device called a “Bandeau,” a horse-shaped piece of precious metal which helped...
Stoll, Betke et al. (2005) In a retrospective study estimated that the survival according their apical extent. Flush fillings had a 94% survival estimation while short and long fillings estimated results were 80.9% and 74.0% respectively in 5 to 10 years.(Caplan and Weintraub 1997) in a case control study found similar results but it was insignificant. They also found that teeth which had long fillings were extracted rather than retained in contrast to short filling which were retained more often than extracted. The previous results show that RCT within 2 mm of the radiographic apex have the best outcomes.
Impression materials are used to register or reproduce the form and relations of the teeth and the surrounding oral tissues (1). Making an impression represents a critical step in processing and fitting of a dental prosthesis (2). Several types of impression materials are produced. These include silicones, polyether, polysulfide and alginate which are available for crowns and fixed partial denture impressions. Silicone impression materials are considered to be suitable impression materials to use for fixed prostheses (3). Also, it has been reported that silicone has the ability to remain dimensionally stable through disinfection procedures (4). Among silicone impression materials, one type of them, called polyvinyl siloxane (PVS) is reported
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
10. Gharizadeh N, Moradi K, Haghighizadeh MH. A study of microleakage in Class II composite restorations using four different curing techniques. Oper Dent. 2007; 32(4): 336-40.