1973
DOI: 10.1016/0022-3913(73)90007-3
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Preparation design and margin distortion in porcelain-fused-to-metal restorations

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Cited by 144 publications
(45 citation statements)
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“…Different finish-line designs have been advocated for several reasons. Preston3 and Shillingburg4 recommended the shoulder-bevel as the best type of finish line for the cast restoration. Rosner5 reasoned that a beveled finish line would fit better than a shoulder and trigonometric analysis to support his assertion.…”
Section: Introductionmentioning
confidence: 99%
“…Different finish-line designs have been advocated for several reasons. Preston3 and Shillingburg4 recommended the shoulder-bevel as the best type of finish line for the cast restoration. Rosner5 reasoned that a beveled finish line would fit better than a shoulder and trigonometric analysis to support his assertion.…”
Section: Introductionmentioning
confidence: 99%
“…Few studies have investigated this problem. Investigators have attributed this issue to reduced metal collar thickness,4 thermal coefficient mismatch, margin design,5 and margin spee 6. Whatever the cause of the distortion, the mismatch of the restoration-abutment complex has to be corrected because an unacceptable marginal gap could result in cement washout,12 with subsequent biological complications, such as secondary caries, periodontal problems and pulpitis 13,14…”
Section: Discussionmentioning
confidence: 99%
“…In metal-porcelain restorations, corruption of the initial fit of the metal framework has been reported after the porcelain firing cycle and observed clinically as a marginal discrepancy 4,5,6. Gemalmaz and Alkumru7 attributed marginal discrepancies to porcelain-metal thermal contraction mismatch, the design of the margin, and the type of alloy used.…”
Section: Introductionmentioning
confidence: 99%
“…Because of high variation of the values within same crown system, the mean value of all measurement locations can show a large local discrepancy and result in an increase in Standard Deviation (SD) 28,41. Although the SD in such studies has been reported to be approximately 20 µm 10,14,16,17,20,33-37. In-Ceram crowns shows mean marginal gap of 27.5 µm14 in one study and 123 µm44 in another.…”
Section: Introductionmentioning
confidence: 93%
“…Direct viewing is a nondestructive and convenient method and has been most frequently used to measure marginal gap at various stages of manufacturing process. Various means of measuring marginal gap by direct viewing include Stereomicroscope,14-17 optical microscope,18-20 optical microscope with image analyzing software,21-23 Laser microscope,24 Scanning Electron Microscope25-27 etc. There are various other non-destructive methods reported in the literature like profile projector28 and laser videography 29.…”
Section: Introductionmentioning
confidence: 99%