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Volume Fraction And Location Of Voids And Gaps In Ultraconservative Restorations By X Ray Computed Microtomography

835 words - 4 pages

INTRODUCTION
Caries diagnosis in contemporary operative dentistry focuses on the earliest detection of carious lesions in order to prevent a progression to a more severe stage or in case that an operative intervention is needed, to remove minimal only amount of tooth substance1,2. Unfortunately, the decision for an operative intervention is not an easy task3 and is becoming even more complicated when decision includes the appropriate restorative technique.4 Decisional problems on restorative treatment of such early lesions is related to the technology available for removing selectively a very small part of tooth substance, and of course to the clinical technique for inserting a restorative ...view middle of the document...

Most of the above methods measure representative 2D sections of cavities, interpolating the results for 3D estimations. Although, efforts in measuring the three dimensional space in small cavities (2mm in diameter) were made28,29, the question of how well a material is adapted to the cavity walls in ultra-conservative cavities, has not been answered yet. Cavities with a mean diameter of 1.0 or 1.5 mm and a mean depth of 2.5 mm are probably closer to the dimensions of an ultra-conservative cavity preparation in clinical practice.
Presence of voids is equally important to the formation of gaps. Opdam et al5 found that voids and wall gap was greater for thicker in consistency materials than medium or thin materials. In another study, Olmez et al17 found that internal voids correlated with marginal microleakage in class II composite restorations. Since material voids are equally important to gap space, and both are depended on the manipulation of the material, it is important to see if voids are also affected by the size of the cavity, during the clinicians’ effort to insert the material to the depth of the cavity. In the study of Lioumi19, it was noted that the width of material-cavity interface was not uniformly distributed over the entire cavity walls but it was different in different parts of the cavity, due to certain parameters. The widest gap formed at the internal line angles of the cavity when margins were beveled, etched and bonded, while a significant amount of voids appeared within the material close to or in contact with the interface.
X-ray computed micro-tomography (micro XCT)...

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