Effect Of The Lingual Margin Configuration On The Fracture Strength Of Class Iv Resin Based Composite Restorations Under Static Loading
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| Author | : Nubia Carolina Garcia Martinez |
| Publisher | : |
| Total Pages | : 84 |
| Release | : 2015 |
| Genre | : Composite materials |
| ISBN | : |
Resin-based composite for Class IV restoration is a conservative alternative for maxillary incisor fracture. Little is known about the effect of lingual margin configurations on the longevity of these restorations. This in vitro experiment compared the mean fracture strength among four lingual margin configurations (butt joint, 45° bevel, 60° bevel and chamfer) for Class IV resin-based composite restorations. A total sample size of n=100 human extracted lower incisors were selected, then the teeth were randomly assigned to one of the four lingual margin configuration groups (n=25) and restored with resin-based composite. After thermocycling (5000 cycles, 5°C-55°C with 30 seconds dwell time), they were subjected to inter-incisal static load (135° angulation) until failure (N). Failure mode was determined. In vitro fracture strength was compared among the four groups using one-way ANOVA at alpha=0.05. Mean standard deviation of fracture strength and frequency distribution of failure modes were reported. Results revealed no significant effect on the fracture strength for the type of lingual margin configurations (F(3,96)=0.13; p=0.9435). The data showed that 71% of failure modes resulted in complete tooth fracture (intact restoration), 11% in total adhesive failure, 7% in adhesive only facial, 6% in total cohesive, 4% in cohesive only facial, 1% in avulsion. Fischer's exact test revealed no statistically significant association (p>0.05) between the margin configurations and failure modes. Within the limitations of this study, it can be concluded that any of the four lingual margin configurations are acceptable in Class IV preparation in terms of fracture strength under static load.
| Author | : H. J. Visser |
| Publisher | : |
| Total Pages | : 180 |
| Release | : 2015 |
| Genre | : Dentistry |
| ISBN | : |
OBJECTIVES : To investigate and compare, in vitro, the fracture behaviours of three types of cusp-replacing posterior composite resin restorations. METHODS : Standard preparations for posterior composite restoration of the mesio-lingual cusp were cut on seventy- five extracted lower left first and second molars and restorations placed. Group A (control, n =25) with a conventional posterior composite resin, Group B (n=25): resin reinforced with nano-scale electrospun glass fibres Group C (n=25) :resin reinforced with a fibre substructure. Specimens were thermocycled for 500 cycles between 5°C and 55°C with a dwell time of 30 seconds, then embedded in plastic cylinders in acrylic resin. The specimens were loaded in a universal testing machine at a 30° angle to the long axis of the tooth until fracture occurred. Fracture patterns were highlighted by staining, studied under a microscope and classified as favourable (restorable) or unfavourable (non-restorable). Sub-classification included adhesive and cohesive failures. RESULTS : Group C exhibited significantly more “restorable” fractures. Group B displayed significantly more “nonrestorable” fractures. Fracture patterns differed significantly between the two fibre-strengthening techniques. (Fisher’s Exact Test p = 0.05) CLINICAL SIGNIFICANCE : Resin restorations reinforced with glass-fibre substructures are more readily repaired after fracture, saving tooth structure, and reducing costs to the patient.
| Author | : Luiz Narciso Baratieri |
| Publisher | : Quintessence Publishing (IL) |
| Total Pages | : 390 |
| Release | : 2005 |
| Genre | : Medical |
| ISBN | : |
"Composite Restorations in Anterior Teeth: Fundamentals and Possibilities" is a book on dentistry.
| Author | : Christopher D. Lynch |
| Publisher | : Quintessence Publishing Company Limited |
| Total Pages | : 210 |
| Release | : 2019-03-19 |
| Genre | : Medical |
| ISBN | : 1850973202 |
The use of resin composite in posterior restorations is an accepted practice, offering a predictable and minimally invasive treatment. Resin composite can be regarded as the "material of choice" for restoring many posterior teeth that have been damaged by caries or trauma. This textbook reviews the most current concepts, presents techniques for successful results, and demonstrates how to avoid common pitfalls.
| Author | : Hani Eid |
| Publisher | : |
| Total Pages | : |
| Release | : 2002 |
| Genre | : |
| ISBN | : |
| Author | : Douglas A. Terry |
| Publisher | : |
| Total Pages | : 210 |
| Release | : 2004 |
| Genre | : Dentistry |
| ISBN | : |
This text highlights information that practitioners need to improve their ability to observe, evaluate, treatment plan, and apply composite resin restorations. It provides a detailed presentation on the development of direct and indirect composite restorations. The text ranges from material selection, preparation designs, and adhesive protocols to the different application of restorative techniqes and finishing procedures. Scientific data and detailed illustrations are intertwined to provide clarity and evidence for these procedures.
| Author | : Burkard Hugo |
| Publisher | : Quintessence Publishing (IL) |
| Total Pages | : 0 |
| Release | : 2009 |
| Genre | : Dental resins |
| ISBN | : 9781850971832 |
1.1 Indications -- 1.2 Esthetic ground rules -- 1.3 Planning basis -- 1.4 Visual effect of tooth shape and ways in which it can be influenced -- 2.1 Preparation for anterior tooth restorations -- 2.2 Resin composite materials: "esthetic systems" -- 2.3 Natural color build-up -- the morphological layering technique -- 2.4 Matrix technique -- 2.5 Resin composite application technique -- 2.6 Finishing and polishing -- 3.1 Building up Class IV -- 3.2 Widening teeth by approximal build-up -- 3.3 Closing or reducing black triangles -- 3.4 Direct resin composite facings -- 4.1 Replacing dental tissue lost as a result of caries, trauma, erosion, abrasion, attrition -- 4.2. Correcting tooth shape while preserving the labial outline -- 4.4 Correcting tooth position -- 4.5 Correcting tooth discoloration and tooth whitening -- 4.6 Direct anterior resin composite fixed dental prostheses -- 4.7 Corrections and repairs using resin composites -- 4.8 Evaluation of the direct technique.
| Author | : Iulian Vasile Antoniac |
| Publisher | : Springer |
| Total Pages | : 0 |
| Release | : 2016-05-05 |
| Genre | : Technology & Engineering |
| ISBN | : 9783319124599 |
This handbook describes several current trends in the development of bioceramics and biocomposites for clinical use in the repair, remodelling, and regeneration of bone tissue. Comprehensive coverage of these materials allows fundamental aspects of the science and engineering to be seen in close relation to the clinical performance of dental and orthopaedic implants. Bioceramics and biocomposites appear to be the most dynamic area of materials development for both tissue engineering and implantable medical devices. Almost all medical specialties will continue to benefit from these developments, but especially dentistry and orthopaedics. In this Handbook, leading researchers describe the use of bionanomaterials to create new functionalities when interfaced with biological molecules or structures. Also described are technologies for bioceramics and biocomposites processing in order to fabricate medical devices for clinical use. Another important section of the book is dedicated to tissue regeneration with development of new matrices. A targeted or personalized treatment device reduces drug consumption and treatment expenses, resulting in benefits to the patient and cost reductions for public health systems. This authoritative reference on the state-of-the-art in the development and use of bioceramics and biocomposites can also serve as the basis of instructional course lectures for audiences ranging from advanced undergraduate students to post-graduates in materials science and engineering and biomedical engineering.
| Author | : |
| Publisher | : |
| Total Pages | : 229 |
| Release | : 2002 |
| Genre | : |
| ISBN | : |
Resin composite (Z250, 3M, St Paul, MN) was bonded in bulk with various degrees of cure into Class 2 preparations in extracted human molar teeth. Two control groups consisted of a highly-cured incrementally-placed group and a non-fatigued low- cure group. The restorations were subjected to 1000 thermal-cycles and 500,000 fatigue cycles from 18 to 85 Newtons using a stainless-steel sphere. Marginal integrity was evaluated using visual rating (ridit analysis) and microleakage. The degree of conversion had a significant effect on marginal defects but not on microleakage. Water had a significant dissolving effect on gingival margin integrity at very low degrees of conversion. Gingival marginal defects were maximized at 25% of maximum conversion and 3% of maximum hardness. There was no overall significant effect of thermal-mechanical stressing on marginal defects or microleakage. A recommended lower limit of gingival margin acceptability in a bulk-filled resin composite restoration was created by 80% of maximum conversion, 73% of maximum hardness and approximately 70% of maximum flexural strength and modulus in the gingival marginal area.
| Author | : Heather Kimberly Teitelbaum |
| Publisher | : |
| Total Pages | : 128 |
| Release | : 2007 |
| Genre | : |
| ISBN | : 9781109984613 |
With the increased use of composite restorations, increased potential problems arise when these materials are used in the posterior dentition and it is critical to understand how these materials function under simulated intra-oral conditions. Since mastication is difficult to replicate in the laboratory, cyclic loading is often used as part of in vitro evaluations, but much of the information available is associated with fatigue testing, which typically does not simulate occlusal loading conditions or failure during clinical function. The present investigation utilized clinically-relevant parameters (specimen size, testing mode, loading rate, and stress levels) to assess the effects of cyclic loading on flexural mechanical properties and fracture morphology of dentin, composite, and dentin-adhesive-composite "laminate" structures, as limited information is available on the effects of cyclic loading on coronal dentin and laminate. The central hypothesis of this investigation was that cyclic loading under simulated intra-oral conditions, rather than conventional static testing, is a more clinically relevant method of determining how physiologic function could potentially affect the flexural properties and the associated failure morphologies of dentin, composite, and laminate structures.
