Marginal Gap of Milled versus Cast Gold Restorations

Johnson, R. P.; Verrett, Ronald G.; Haney, Stephan J; Mansueto, Michael A.; Challa, Suman

doi:10.1111/jopr.12432

Cited by 26 publications

(14 citation statements)

References 14 publications

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“…The marginal gap width was found to range from 24.2 to 29.5 µm in this study. There were no significant differences in marginal gap widths among the dental stones examined, and the marginal gap widths were in a similar range to those of previous studies [12][13][14] in which the shape of the abutment was slightly different but the gap widths of crowns made by the same casting alloy were reported to be approximately 30 µm. Although the present study found different amounts of setting expansion among the dental stones ( Fig.…”

Section: Discussionsupporting

confidence: 85%

“…The present study examined the adaptability of cast crowns to abutments using working casts prepared with SM. Following the procedure reported in previous studies [12][13][14] , the gap widths between the crown margins and the shoulder margins of the abutments were measured. In order to clarify the difference between the dental stones used, the procedures for fabrication of cast crowns were identical for the experimental groups after taking the impression and preparing the working cast.…”

Section: Discussionmentioning

confidence: 99%

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Characteristics of a new dental stone mixed by shaking

et al. 2020

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This study evaluated the physical and mechanical properties of a dental stone mixed by shaking. A shake-mix dental stone (Shake! Mix STONE; SM) was characterized in comparison with three conventional dental stones. The fluidity at pouring time, setting time, density, powder particle distributions, linear setting expansion, compressive strength and surface reproduction of detail for dental stones were investigated. The marginal adaptations of cast crowns to dies made with each stone were also determined. SM had higher fluidity and faster setting time than the other stones (p<0.05). The setting expansion of SM at 2 h was lower than those of other two stones (p<0.05). The 15-min compressive strength of SM was higher than the others (p<0.05). There were no significant differences in the marginal adaptations of the cast crowns fabricated using all the stones (p>0.05). In spite of the different mixing method, the shake-mix type dental stone had comparable physical and mechanical properties to the conventional dental stones.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Characteristics of a new dental stone mixed by shaking

et al. 2020

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“…Besides the type of material, adjustment of restorations before cementation is a matter of great importance and can determine the final internal and marginal discrepancies. [20][21][22] This study aimed to evaluate and compare the marginal and internal adaptations of crowns made of three different CAD/CAM materials before and after adjustment. The first null hypothesis was that there would be no difference between LDGC (IPS e.max CAD), ZLS (Vita Suprinity), and PICN (Vita Enamic) regarding marginal and internal adaptation of full-coverage restorations.…”

Section: Introductionmentioning

confidence: 99%

How adjustment could affect internal and marginal adaptation of CAD/CAM crowns made with different materials

2020

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PURPOSE.Recently introduced hybrid and reinforced glass ceramic computer-aided design/computer-aided manufacturing (CAD/CAM) materials have been used for full-coverage restorations. However; the effect of adjustment and type of materials on internal and marginal adaptation are unknown. This study aimed to evaluate and compare the marginal and internal adaptations of crowns made of three different CAD/CAM materials before and after adjustment. MATERIALS AND METHODS. One acrylic resin maxillary first molar was prepared and served as the master die. Thirty-six restorations were fabricated using CAD/CAM system (CEREC Omnicam, MCXL) with three materials including lithium disilicate (IPS e.max CAD), zirconia-reinforced lithium silicate (Suprinity), and hybrid ceramic (Enamic). Internal and marginal adaptations were evaluated with the reference point matching technique before and after adjustment. The data were analyzed using mixed ANOVA considering α=.05 as the significance level. RESULTS. The effect of adjustment and its interaction with the restoration material were significant for marginal, absolute marginal, and occlusal discrepancies (P<.05). Before adjustment, Suprinity had lower marginal discrepancies than IPS e.max CAD (P=.18) and Enamic (P=.021); though no significant differences existed after adjustment. CONCLUSION. Within the limitations of this study, crowns fabricated from IPS e.max CAD and Suprinity resulted in slightly better adaptation compared with Enamic crowns before adjustment. However, marginal, axial, and occlusal discrepancies were similar among all materials after the adjustment.

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“…[5][6][7][8][9] In previous research, dental gold-based alloys showed wear characteristics very similar to human enamel. 1,2 Nevertheless, in spite of their excellent marginal accuracy 10,11 and uncontested mechanical/ tribological properties, 12 an increasing demand for better esthetics persuaded clinicians to withdraw full-gold restorations in favor of alternative toothcolored materials.…”

Section: Introductionmentioning

confidence: 99%

Wear Evaluation of Prosthetic Materials Opposing Themselves

D’Arcangelo

Vanini²,

Rondoni³

et al. 2018

Operative Dentistry

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The purpose of the present in vitro study was to compare the two-body wear resistance of a type 3 gold alloy (Aurocast8), two lithium disilicate glass ceramics (IPS e.max CAD and IPS e.max Press), a heat-pressed feldspathic porcelain (Cerabien ZR Press), an yttria-stabilized tetragonal zirconia polycrystal ceramic (Katana Zirconia ML), and three heat-cured composite resins (Ceram.X Universal, Enamel Plus Function, and Enamel Plus HRi) opposing antagonistic cusps made out of the same restorative materials. Ten 6-mm-thick samples and 10 cusp-shaped abraders were manufactured with each test material (n=10) according to standard laboratory procedures. All sample/antagonist pairs made out of the same material were subjected to a two-body wear test in a dual-axis chewing simulator for up to 120,000 loading cycles. The total vertical wear (mm) and the total volumetric loss (mm) for each sample/antagonist pair were calculated. Data were statistically analyzed using one-way analysis of variance tests. The total vertical wear for the gold alloy was not significantly different compared to Ceram.X Universal, Enamel Plus Function, IPS e.max CAD, and Cerabien ZR Press. Significantly increased wear values were observed for Enamel Plus HRi and IPS e.max Press. The lowest values for total vertical wear and volumetric loss were recorded on the monolithic zirconia.

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Marginal Gap of Milled versus Cast Gold Restorations

Abstract: Within the limitations of this study, results indicate that gold restorations milled with the tested parameters provide a vertical marginal gap that is an acceptable alternative to traditional gold crown casting techniques.

Cited by 26 publications

References 14 publications

Characteristics of a new dental stone mixed by shaking

Characteristics of a new dental stone mixed by shaking

How adjustment could affect internal and marginal adaptation of CAD/CAM crowns made with different materials

Wear Evaluation of Prosthetic Materials Opposing Themselves

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