The fit of metal-ceramic crowns, a clinical study

Fransson, Bo; Oilo, G; Gjeitanger, R.

doi:10.1016/s0109-5641(85)80019-1

Cited by 161 publications

(142 citation statements)

References 3 publications

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“…27 However, most authors agree that marginal openings or inaccuracies of less than 120 mm seem to be in the range of clinical acceptance with regard to longevity. 24,25,28,29 For different all-ceramic systems the marginal gap reported in several studies was within the range of 1-161 mm. 23,28,30,31 With regard to the values of gap widths of Cerec crowns reported by previous investigators a comparison of the results can be confusing.…”

Section: Discussionmentioning

confidence: 88%

“…The replica technique, described initially by McLean and von Fraunhoffer, has been a reliable and valid non-invasive method to determine the adaptation of crowns to tooth-structure. [24][25][26] Since then other researchers have used this method to measure crown film thickness. 23,25,26 In this study both methods have been used in order to evaluate the effectiveness of each technique to measure the marginal gap.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of the marginal fit of three margin designs of resin composite crowns using CAD/CAM

Tsitrou¹,

Northeast²,

Noort³

2007

Journal of Dentistry

140

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Evaluation of the marginal fit of three margin designs of resin composite crowns using CAD/CAM

Tsitrou¹,

Northeast²,

Noort³

2007

Journal of Dentistry

140

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“…[2][3][4][5] Before cementation, the MC FPD presented a marginal discrepancy (geometric mean) of 53 µm, the Empress®2 FPD 57 µm and the EPC FPD 55 µm. Considering a clinically acceptable range for marginal gap of 50 and 100 µm, 37,38,39 almost all restorations presented clinically acceptable marginal accuracy. Only few restorations, all of them belonging to the Empress®2 group, showed unacceptable high marginal gap values.…”

Section: Discussionmentioning

confidence: 92%

Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

et al. 2004

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Purpose This study compares the marginal accuracy of posterior metal ceramic (MC), all-ceramic IPS Empress®2 and experimental pressed ceramic (EPC-VP 1989/4) three-unit fixed partial dentures (FPD), before and after luting and after thermo-mechanical fatigue in a dual-axis chewing simulator. Materials and methods Caries-free human teeth (n=160) were used as abutments for the fabrication of eighty posterior three-unit FPD, divided into two test-groups, IPS Empress®2 and EPC, of 32 samples each and one control group of 16 samples metal ceramic FPD. All FPD were cemented with Variolink®II dual-curing resin cement. Half of the samples in each group were exposed to a dual-axis chewing simulator. Results The geometric mean marginal gap values (µm, before cementation, after cementation and after thermo-mechanical fatigue) amounted to 53, 63 and 62 for the ceramic metal FPD, 57, 71 and 68 for the Empress®2 FPD and 55, 67 and 68 for the EPC FPD. In all groups a statistically significant increase in marginal gap width was observed after cementation. The effect of functional loading in the chewing simulator on marginal gap was not significant. Marginal gap was lowest in the control group but differences with all-ceramic materials were small in all evaluation stages. Conclusion Within the limits of this investigation, it can be concluded that marginal gap values of these all-ceramic materials and conventional MC techniques are on a similar level. In particular, almost all marginal gap values observed in this study were within the limits of clinical acceptance.

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“…Theoretically based goals for film thickness range from 25 to 50 µm, but a discrepancy of up to 120 µm is considered acceptable based on in vitro and clinical studies. [13][14][15][16] Different ways of measuring the fit of a restoration have been reported. The present study used a replica technique with proven reliability.…”

Section: Introductionmentioning

confidence: 99%

“…17,18 The technique may present some practical problems such as the risk of air bubbles at the interface between light-and heavy-body impression material and tearing. 14 An alternative method is to cement the copings onto the abutments and measure the cement film thickness after sectioning. However, that technique does not eliminate the risk of defects and is destructive.…”

Section: Introductionmentioning

confidence: 99%

Effect of production method on surface roughness, marginal and internal fit, and retention of cobalt-chromium single crowns

Lövgren

Roxner

Klemendz

et al. 2017

The Journal of Prosthetic Dentistry

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This is an author produced version of a paper published in Journal of Prosthetic Dentistry. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the published paper:Lövgren, Niklas; Roxner, Rikard; Klemendz, Susanne; Larsson, Christel.(2017). Effect of production method on surface roughness, marginal and internal fit, and retention of cobalt-chromium single crowns. Purpose. The purpose of this in vitro study was to examine 3 different production methods with regard to surface roughness, marginal and internal fit, and the retention of cobalt-chromium alloy single crown copings. Material and methods.A master abutment of a premolar mandibular tooth preparation with 4-mm height and a 0.6-mm deep 120-degree chamfer finish line with a 12-degree angle of convergence was replicated in die stone and scanned. Thirty-six cobalt-chromium alloy copings were produced using 3 different production techniques. Twelve copings were produced by lasersintering (LS), 12 by milling (M), and 12 by milled wax/lost wax (MLW). The surface microstructure of 2 copings in each group was analyzed using interferometry. The remaining 10 copings in each group were used to evaluate marginal and internal fit by using an impression material replica method, and retention was evaluated by using a uniaxial tensile force pull-off test. The copings from each test group (MLW, M, and LS) were cemented with zinc phosphate cement onto resin abutments. Statistical analyses of differences in marginal and internal fit were performed using one-way ANOVA and the Mann-Whitney test. Differences in surface topography were analyzed with the Kruskall-Wallis and Mann-Whitney tests for nonparametric Conclusions. Laser-sintered Co-Cr crown copings showed increased surface roughness and better internal and marginal fit than copings produced by milling or the milled wax/lost wax technique. However, the crown pull-off tests did not reveal any significant differences. CLINICAL IMPLICATIONSCobalt-chromium alloy copings produced by laser-sintering may reduce the risk of complications due to increased surface roughness and improved fit.

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The fit of metal-ceramic crowns, a clinical study

Cited by 161 publications

References 3 publications

Evaluation of the marginal fit of three margin designs of resin composite crowns using CAD/CAM

Evaluation of the marginal fit of three margin designs of resin composite crowns using CAD/CAM

Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

Effect of production method on surface roughness, marginal and internal fit, and retention of cobalt-chromium single crowns

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