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  3. Laboratory comparison of different microleakage evaluation methods in class five composite resin restorations

Laboratory comparison of different microleakage evaluation methods in class five composite resin restorations

Number of pages: 87 File Format: word File Code: 32111
Year: 2012 University Degree: Master's degree Category: Medical Sciences
Tags/Keywords: color out - Damage repair - Fluid filtration - Grade five caries - Liquid penetration - micro leakage - Penetration of color - Resin composite
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  • Summary of Laboratory comparison of different microleakage evaluation methods in class five composite resin restorations

    Dissertation to receive a doctorate degree in dentistry

    Abstract

    Objective

    The purpose of this study is to compare the microleakage of adhesive total etch and self etch in three methods
    Fluid filtration, dye penetration and dye extraction, as well as determining the statistical relationship between these three methods.

    Materials and methods

    In this laboratory study, 72 extracted human premolar teeth, class five cavities, were shaved up to 1 mm below the CEJ on the buccal surfaces in the cervical 1/3. Opti bond solo plus total adhesive was used in half of the holes and All in one self-etch adhesive was used in the other half, then all the holes were repaired with light cure composite called Herculite XRV and according to the microleakage measurement method, the samples were divided into three main groups of 24 and each group was divided into two subgroups of 12 based on the type of adhesive used: in the first group, the test was to evaluate the microleakage of the samples using the Dye method. extraction, dye penetration method was used in the second group and fluid filtration method was used in the third group. Opti Bond Solo Plus total etch adhesive was used in the first subgroup of each group and Opti Bond All in One self etch adhesive was used in the second subgroup. To analyze the data, paired t-tests and Mann-Whitney tests were used, and the correlation coefficient with a significance level of ? = 0.05 was used.

    Findings

    Regarding the comparison of microleakage of two types of adhesives used, there was no significant difference between the microleakage of these adhesives for the dye extraction method (P=0.657). For the dye penetration method, the difference in the microleakage of adhesives was not significant (P=0.755), but in the case of the Fluid filtration method, the microleakage of self-etch adhesive was significantly higher than that of total-etch adhesive (P=0.012).

    Also, no significant relationship was found between different methods of microleakage evaluation for different adhesives (P 0.05).

    Conclusion

     

    According to the data of this study, it can be concluded that using the Fluid filtration method to evaluate microleakage, Opti Bond All In One self-etch adhesive has more microleakage than Opti Bond Solo Plus total etch adhesive.

     

    Key words

    micro leakage - liquid penetration - dye penetration - dye leakage

     

     

    Introduction

     

    One ??of the beauty materials for repairing Class 5 lesions and caries is Light Cure composites with various self-etch or total etch dentin adhesives, which make the composite stick to the dentin(1). Adhesion to dentin is still more challenging than adhesion to enamel, and an adhesive restoration may not be sufficiently attached to the etched dentin surface and cause marginal seam formation and microleakage (2).

    Various laboratory studies on the microleakage of self-etch and total-etch adhesives, which generally include class five composite restorations. is done In these studies, in order to measure microleakage, the samples are immersed in different color solutions such as methylene blue, silver nitrate or fuchsia base, and the depth of dye penetration in each sample is determined at the resin-dentin interface (3). In order to more accurately evaluate the microleakage of composite restorations, in addition to the older methods of fluid filtration and dye penetration, it is necessary to use new methods of microleakage evaluation such as dye extraction. In this method, in order to determine microleakage, the dissolution rate of methylene blue colored solution in nitric acid is measured by a spectrophotometer with a wavelength of 550 nm.Therefore, in this research, in order to more accurately evaluate the microleakage of composite restorations with total etch and self etch adhesives, in addition to the common methods of fluid filtration and dye penetration, the newer method of dye extraction was used, and by considering the fluid filtration method as a control, we determined the methods that are meaningfully related. Also, the average microleakage of the total etch and self-etch adhesives of the study was investigated according to three different methods of microleakage assessment. It is ivory. In terms of characteristics, each composite has four building components: polymer matrix, filler particles, binding agent of the above-mentioned two components and a type of primer. The matrix is ??a continuous component to which other components are added. Most of the composite matrices are based on Bis-GMA resin (bisphenol A- glycidyl methacrylate). Some composites use urethane dimethacrylate (UDMA) instead of Bis-GMA, while another group uses a combination of two materials. Recently, some manufacturers have added TEG-DMA (triethylene glycol dimethacrylate), which is a low-viscosity resin used as a diluent, as a component of the material.

    The formulation of the material using Bis-EMA (Bisphenol A, polyethylene glycol diether dimethacrylate) may have better application properties and shrinkage. find a smaller volume (4). The filler particles are usually some type of glass (such as barium glass) or silicon dioxide, which are added to the matrix to improve its physical properties. Fillers improve transparency, reduce the coefficient of heat expansion, reduce polymerization shrinkage, make the material harder, denser and more resistant to wear. Generally, the higher the percentage of filler added (both by volume and weight), the better the physical properties of the composite will be. The filler addition has a certain maximum, after which the material becomes too viscous for clinical use.

    The surface of the filler particles is impregnated with silane. This material is a type of bonding agent whose purpose is to improve adhesion to the matrix. Without this binding agent, the composite is not strong enough and the filler particles tend to be torn off from the matrix as soon as they reach the surface (5). The initiator activates the polymerization reaction of composites. Activation may be initiated by a chemical reaction or exposure to light of the correct wavelength. Most of the common composite restorative materials today rely on the initiation of polymerization by exposure to visible light in the range of 460 to 480 nm (blue light). The aim of this study was to compare the microleakage of total-etch and self-etch adhesives by three methods including dye extraction, dye penetration and fluid filtration with determining the correlation value among these techniques. teeth were selected for this in vitro study and Class 5 cavities were prepared on the buccal surface of these at the cemento-enamel junction area. It was applied for half of these cavities, Opti Bond Solo Plus; a total-etch adhesive and another half Opti Bond All in One; self-etch adhesive and then all of them were restored with light cure resin composite (Herculite XRV). Then samples were divided randomly into three subgroups based on the method of microleakage measurement (n=12). In the first pair group, leakage was assessed by dye extraction method. Dye penetration and fluid filtration methods were used in the second and third pair groups for the same purpose respectively. Data were analyzed by Paired t-test and MannWhiteny test and correlation coefficient (?=0.05).

    Results

    There were no significant difference in dye extraction (P=0.657) and dye penetration (P=0.755) methods between the microleakage of total-etch and self-etch adhesives. Microleakage of self-etch adhesive in fluid filtration technique was significantly more than total-etch adhesive (P=0.

  • Contents & References of Laboratory comparison of different microleakage evaluation methods in class five composite resin restorations

    List:

    Title.. page

    Persian abstract .. 1

    Chapter one: Introduction and review of articles

    Introduction.. 4

    Composite resins.. 6

    Physical properties of composite resin. 7

    Application features of composite resins. 9

    Optical properties of composite resins. 10

    Normal composites.. 12

    Microfil composites.. 13

    Hybrid composites.. 14

    Silanable composites.. 14

    Condensable composites.. 15

    Nanofil composites.. 16

    Adhesion to enamel and dentine.. 17

    Challenges in adhesion to dentine. 19

    Classification of adhesives.. 22

    Etch & Rinse adhesives or Total H. 22

    Etch & rinse three-step versus two-step adhesives. 25

    Self-etch adhesives.. 26

    The first generation of bonding materials.. 31

    The second generation of bonding materials.. 33

    The third generation of bonding materials.. 34

    The fourth generation of bonding materials. 36

    The fifth generation of bonding materials. 37

    The sixth generation of bonding materials. 38

    The seventh generation of bonding materials. 39

    Using adhesive resin.. 40

    Micro leakage.. 41

    Types of laboratory methods to check micro leakage. 44

    Review of the articles.. 48

    Statement of the problem.. 56

    General objective.. 56

    Specific objectives.. 56

    Chapter two: materials and methods

    Materials and methods.. 58

    Selection and preparation of samples.. 60

    Performing evaluation methods Micro leakage.. 63

    Variables.. 71

    Data analysis method.. 72

    Chapter three: findings

    Findings.. 73

    Part one.. 73

    Part two: data analysis.. 75

    Chapter four: discussion

    Discussion..81

    Chapter Five: Conclusions and Suggestions

    Conclusions and Suggestions. 87

    Resources..88

    Abstract

    Source:

     

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Laboratory comparison of different microleakage evaluation methods in class five composite resin restorations
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