Scanning electron microscopic evaluation of clinically cemented cast gold restorations

Lofstrom, Lennart H.; Barakat, Mohamed M.

doi:10.1016/s0022-3913(89)80038-1

Cited by 28 publications

(27 citation statements)

References 7 publications

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“…Christensen19 reported that the range of clinically acceptable marginal gap was 34 - 119 µm for subgingival and 2 - 51 µm for supragingival margins, whereas McLean and von Fraunhofer30 concluded that 120 µm was the maximum acceptable marginal opening. Lofsrom and Barakat25 reported clinically acceptable marginal gap values of 7 - 65 µm. Considering all these studies, the mean marginal openings for both groups in this study were within the range of clinical acceptability with mean marginal gap of 70 (24) µm for Vita In-Ceram sprint system and 48 (42) µm for Turkom-Cera after porcelain application.…”

Section: Discussionmentioning

confidence: 97%

“…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%

“…He also reported that the range of clinically acceptable marginal gap was 34 to119 µm for subgingival and 2 to 51 µm for supragingival margins. Lofstrom and Barakat used scanning electron microscope to measure the supragingival margins of the crowns that were considered clinically well fitting by several dentists and reported marginal gap value of 7 to 65 µm 25. McLean and von Fraunhofer investigated the cement film thickness by an in vivo technique and stated that marginal gap of 120 µm should be the limit of clinical acceptability 30…”

Section: Introductionmentioning

confidence: 99%

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A comparison of marginal fit of glass infiltrated alumina copings fabricated using two different techniques and the effect of firing cycles over them

Bhowmik

Parkhedkar

2011

J Adv Prosthodont

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PURPOSEThis study evaluated marginal fit of glass infiltrated alumina cores fabricated using two techniques and their marginal stability after firing cycles of veneering porcelain.MATERIALS AND METHODSFifteen standardized all-ceramic crowns were fabricated on a metal die using each technique: slip cast technique of VITA In-Ceram sprint Alumina (Group A as control) and plastic foil matrix technique of Turkom-Cera fused alumina core system (Group B). Copings were compared between groups and within groups at coping stage and after firing each layer of veneering porcelain. A device was used to standardize seating of copings on the metal die and positioning of the specimens under the microscope after each stage of fabrication. The specimens were not cemented and marginal gap was measured using an image analyzing software (Imagepro Express) on the photographs captured under an optical microscope. Two tailed unpaired 't test' was used to compare marginal gaps in two groups and one way ANOVA was used to analyze marginal distortion within each group at 95% confidence interval.RESULTSThe marginal gap was smaller at the coping stage in group B (60 + 30 µm) than group A (81 + 21 µm) with statistical significance. After firing of veneering porcelain the difference was insignificant. At the final stage, both groups exhibited lower mean marginal gaps than at the initial coping stage with the difference of 11.75 µm for group A and 11.94 µm for group B, but it was statistically insignificant due to high value of standard deviation.CONCLUSIONWithin the limitations of this study, it was concluded that both techniques produced copings with comparable and acceptable marginal fit and marginal stability on firing veneering porcelain.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A comparison of marginal fit of glass infiltrated alumina copings fabricated using two different techniques and the effect of firing cycles over them

Bhowmik

Parkhedkar

2011

J Adv Prosthodont

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“…The margins of an AMR made from gold have been found to reach 7 to 65 µmillimeters (Lofstrom & Barakat, 1989). The marginal integrity of the MCR has been found to range from 6 to 34 µmillimeters (Donovan & Prince, 1985).…”

Section: Marginal Integrity In Dental Restorationsmentioning

confidence: 95%

Marginal Integrity of Glass Ionomer and All Ceramic Restorations

Hanson¹

2015

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“…Bei der Zementierung von Kronen mit Glasionomerzement oder Zink-Phosphat-Zement konnte eine Erhöhung des durchschnittlichen Randspaltes von 43 μm auf 63 μm registriert werden [14]. Die Angaben zu klinisch akzeptablen Randspaltbreiten variieren zwischen 30 μm und 100 μm [2,[15][16][17][18][19][20][21][22][23]. Einige Autoren halten auch Randspaltbreiten von bis zu 200 μm für unproblematisch [20,24,25].…”

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Klinische Beurteilung von Kronenpassungen - Einfluss des marginalen Randspaltes und der Stufenkontur

Boeckler¹,

Stadler²,

Setz³

2007

ZWR

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Einfluss des marginalen Randspaltes und der StufenkonturEntscheidende Kriterien für den Erfolg einer Kronenrestauration sind die Größe des marginalen Randspaltes und die Kontur des Kronenrandes. Die Bestimmung dieser Parameter ist im klinischen Alltag allerdings nur nach subjektivem Ermessen möglich. Diese Studie beschreibt die Korrelation zwischen der objektiven marginalen Randspaltbreite und der Kronenkontur und der subjektiven Einschätzung der Kronenpassung durch Zahnärzte und Zahntechniker. Bei Vollgusskronen aus verschiedenen Legierungen und Herstellungstechniken (Gusstechnik: AuAgCu, AuPdPt, PdAgAu, CoCrMo, Ti und Frästechnik: Ti) fanden sich sowohl marginale Randspalten als auch überkonturierte Kronenränder. Die gemessenen Parameter korrelierten signifikant (p < 0,05) mit der subjektiven Einschätzung der Kronenpassung durch Zahnärzte und Zahntechniker. Sowohl die Entscheidung, ob der marginale Randschluss akzeptabel ist, als auch, ob die Krone klinisch zementiert werden kann, wurde nur vom Ausmaß der Überkonturierung signifikant beeinflusst.

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Scanning electron microscopic evaluation of clinically cemented cast gold restorations

Cited by 28 publications

References 7 publications

A comparison of marginal fit of glass infiltrated alumina copings fabricated using two different techniques and the effect of firing cycles over them

A comparison of marginal fit of glass infiltrated alumina copings fabricated using two different techniques and the effect of firing cycles over them

Marginal Integrity of Glass Ionomer and All Ceramic Restorations

Klinische Beurteilung von Kronenpassungen - Einfluss des marginalen Randspaltes und der Stufenkontur

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