Marginal fit of gold inlay castings

Christensen, Gordon J.

doi:10.1016/0022-3913(66)90082-5

Cited by 373 publications

(161 citation statements)

References 2 publications

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“…Based on the examination of more than 1,000 crowns, McLean and von Fraunhofer [42][43][44] established the most widely used maximum tolerable marginal gap criterion of 120 µm. This criterion is in agreement with the range of 100-120 µm in many previous reports, although maximum marginal gaps ranging from 50 to 200 µm have been reported 45,46) . Many techniques have been proposed to achieve passive fit, defined as a fit resulting in no long-term clinical complication 47) .…”

Section: Discussionsupporting

confidence: 79%

A comparative study of marginal fit of copings prepared with various techniques on different implant abutments

Koç

Öngül

Şermet

2016

Dental Materials Journal

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This study evaluated fabrication techniques of recently introduced all-ceramic copings' marginal adaptation on two different implant abutments with different finish lines. Five different copings were prepared (Casted chrome-cobalt metal coping, Zirkonzahn, Cercon, In Ceram Alumina and IPS e.max Press) on two cementable implant abutments with two marginal designs. Ten samples for each coping group were prepared (totally 100 samples). Copings were cemented to implant abutments and marginal gap measurements were done from 24 points with stereomicroscope and the datas were analyzed by the Kruskal-Wallis test before cementation. Cercon copings showed the lowest marginal fit scores and metal copings showed the highest scores. After cementation, all marginal gap values have been increased. All marginal gap values obtained from crown copings can be considered in clinically acceptable limits (<120 µm) except metal copings after cementation on abutment with 135 degrees shoulder group (123 µm).

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Section: Discussionsupporting

confidence: 79%

A comparative study of marginal fit of copings prepared with various techniques on different implant abutments

Koç

Öngül

Şermet

2016

Dental Materials Journal

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“…36 The marginal fit of Y-TZP crowns was evaluated by Att and others, 37 who found marginal gaps of between 64 and 78 lm. A cervical misfit of up to 119 lm is considered clinically acceptable, [38][39][40][41][42] which makes it important to observe the effect caused by the vitrification of crowns on the marginal fit of Y-TZP crowns.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Resin Bond Strength to Yttria-stabilized Tetragonal Zirconia and Framework Marginal Fit: Comparison of Different Surface Conditionings

Vanderlei

Bottino

Valandro

2014

Operative Dentistry

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The low-fusing glass application followed by hydrofluoric acid etching and silanization seems to be a promising method for improving the resin bond strength to yttria-stabilized tetragonal zirconia, but the adhesion to this substrate is still a challenge. SUMMARYThe purpose of this study was to evaluate the effect of different surface treatments of yttriastabilized tetragonal zirconia (Y-TZP) on bond strength durability and marginal discrepancies. For adhesion testing, 144 specimens of VITA In-Ceram YZ ceramic for InLab were obtained (5.2533.7534.5 mm) and divided into six groups (n=24) according to the surface treatment: 1) Control (CRTL): untreated; 2) SIL: tribochemical silica coating (CoJet system, 3M/ESPE AG); 3) V1+HF: spray application of low-fusing porcelain glaze (V1, VITA Akzent Spray Glaze) followed by etching with hydrofluoric acid (HF) (one minute); 4) V1+SIL: V1 glazing (VITA Akzent Spray Glaze) followed by tribochemical silica coating; 5) V2+HF: brush application of low-fusing porcelain glaze (VITA Akzent Glaze) plus etching with HF (one minute); and 6) V2+SIL: V2 glazing (VITA Akzent Glaze) plus tribochemical silica coating. After all treatments, the surfaces were silanized for five minutes (ESPE-SIL) and cementation was performed using Panavia F (Kuraray). Half of the specimens in each treatment were tested 24 hours after cementation (dry), with the other half subjected to storage (150 days) and thermocycling (12,0003) (aging), and then a shear test was carried out (1 mm/ min). The micromorphological (digital optical profilometry and scanning electron microscopy) and elemental analyses of the treated surfaces were performed. The inner surfaces of 60 Y-TZP infrastructures were conditioned and marginal fit was evaluated. The statistical analysis revealed that the groups treated via surface glaze application followed by hydrofluoric acid etching and silanization showed the highest bond strength (in dry and aging conditions), but the bond strengths were affected by aging. The highest marginal discrepancies were observed in the groups receiving glaze (117.4 6 29.6 to 105.8 6 12.2 lm) when compared to other groups (55.3 6 8.7 and 55 6 8.5 lm). Low-fusing porcelain glaze + hydrofluoric acid etching changed the morphology of the Y-TZP ceramic and improved the adhesion to the resin cement, but obtaining high and stable bond values to Y-TZP remains challenging. Marginal discrepancies increased with glazing.

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“…Thus, it may be appropriate to refer to the gap for full cast crowns that have been used for crown restoration. Christensen defined two categories for the marginal fit of restorations: (1) supragingival finish lines, where discrepancies ranging from 2-51 μm were considered satisfactory; and (2) subgingival finish lines, where marginal discrepancies ranging from 34-119 μm were deemed acceptable; furthermore, he states that the marginal discrepancy of 30-40 μm is clinically acceptable for visually accessible margins 26) . Boening et al reported that marginal gaps of 100 μm are considered clinically acceptable with regard to longevity 27) , and Christensen states that theoretical requirements of marginal gaps should be lower than 40 μm 28) .…”

Section: Discussionmentioning

confidence: 99%

Fit of zirconia all-ceramic crowns with different cervical margin designs, before and after porcelain firing and glazing

et al. 2014

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The purpose of this study is to investigate the fit of zirconia cores and all-ceramic crowns prepared with different cervical margin designs. The radius of curvature between the axial wall and the occlusal surface was set to 1 mm in an abutment using the cervical shoulder marginal design (S) and to 0.2 and 0.5 mm in abutments with round shoulders (0.2RS and 0.5RS, respectively). The internal gaps of the cores were 45-138 μm (S), 41-141 μm (0.2RS), and 43-133 μm (0.5RS). The internal gaps of the all-ceramic crowns were 40-115 μm (S), 45-113 μm (0.2RS), and 42-126 μm (0.5RS). There were no significant differences in one-way ANOVA for any region in any marginal design before and after firing the porcelain. The marginal gaps between the all-ceramic crowns and dies were 27±25 (S), 30±29 (0.2RS), and 24±27 μm (0.5RS), again with no significant differences in one-way ANOVA.

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Marginal fit of gold inlay castings

Cited by 373 publications

References 2 publications

A comparative study of marginal fit of copings prepared with various techniques on different implant abutments

A comparative study of marginal fit of copings prepared with various techniques on different implant abutments

Evaluation of Resin Bond Strength to Yttria-stabilized Tetragonal Zirconia and Framework Marginal Fit: Comparison of Different Surface Conditionings

Fit of zirconia all-ceramic crowns with different cervical margin designs, before and after porcelain firing and glazing

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