Preparation design and margin distortion in porcelain-fused-to-metal restorations

Shillingburg, Herbert T.; Hobo, Sumiya; Fisher, Donald

doi:10.1016/s0022-3913(03)00239-7

Cited by 26 publications

(42 citation statements)

References 9 publications

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“…This finding is in agreement with previous studies (12,15,17,20). However, other studies (13,18) have reported that the marginal gap increased significantly after ceramic application.…”

Section: Discussionsupporting

confidence: 94%

“…In some cases, a well-fitted metal coping may not fit after porcelain application (15). Some authors believe that the most significant change occurs during the alloy oxidation cycle (16).…”

Section: Discussionmentioning

confidence: 99%

“…The marginal gap of metal-ceramic crowns has been the focus of various investigations (5,7,8,(13)(14)(15)(16)(17)(18)(19)(20). There are, in the literature, several methods of gap measurements (5,7,8,12,(14)(15)(16)(17)(18)(19)(20) and no agreement of which is the most accurate way.…”

Section: Introductionmentioning

confidence: 99%

“…There are, in the literature, several methods of gap measurements (5,7,8,12,(14)(15)(16)(17)(18)(19)(20) and no agreement of which is the most accurate way. The measuring of marginal gap using light microscopy has been widely used (8,15,17,21) with variation in the magnitude of the microscope and number of measurement per sample.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Finish Line on Marginal Fit of Sintered Gold Copings

et al. 2013

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The aim of this study was to evaluate the vertical marginal gap of sintered gold copings and metal-ceramic crowns with different finish line preparations: a beveled round shoulder (BRS) and a beveled long chamfer (BLC), testing the null hypotheses that there are no differences in marginal gap regardless of finish line and phase of restoration (coping or crown). Stainless steel master models were fabricated to simulate tooth preparation for metal-ceramic crowns with different finish lines (BRS and BLC). Ten dies were obtained from each model. Preparations were coated with 2 layers of spacer to 1 mm from the margin. Sintercast gold copings were prepared, sintered and adjusted to the dies. The copings (n=10) were placed onto the master model and the marginal gap was measured in 24 equidistant points using optical microscopy (X230). An opaque and two body ceramic layers were subsequently applied to the copings and the same measuring procedure was performed for the crowns. The data were analyzed statistically using paired and unpaired Student's t-test (α=0.05). Mean marginal gap values (μm) for the copings and crowns were, respectively: 113.6 and 117.1 for the BRS; and 58.2 and 74.3 for the BLC preparation. Significantly greater marginal gaps (p=0.0307) were found for restorations with BRS than with BLC finish line, which also showed statistically significant differences in the gap size between coping and crown (p=0.001). In conclusion, marginal gap is influenced by ceramic application on copings fabricated on BLC preparation, and greater marginal gaps were found for restorations with BRS finish line, rejecting the experimental null hypotheses.

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“…This finding is in agreement with previous studies (12,15,17,20). However, other studies (13,18) have reported that the marginal gap increased significantly after ceramic application.…”

Section: Discussionsupporting

confidence: 94%

“…In some cases, a well-fitted metal coping may not fit after porcelain application (15). Some authors believe that the most significant change occurs during the alloy oxidation cycle (16).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Finish Line on Marginal Fit of Sintered Gold Copings

et al. 2013

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“…[4][5]7 Some studies performed on metal-ceramic restorations revealed that the finish line design had no influence on marginal adaptation, 5,7 while others reported that the shoulder type of preparation had less marginal distortion than the chamfer type after repeated ceramic firings. 4,[7][8] Yttrium tetragonal zirconia polycrystal (Y-TZP) (hereon: zirconia) frameworks can be fabricated mainly with the help of CAD/CAM or copy-milling techniques by means of grinding a zirconia block. These blocks can be milled either in the green, pre-sintered or completely sintered stage.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cervical Finish Line Type on the Marginal Adaptation of Zirconia Ceramic Crowns

Çömlekoğlu¹,

Dündar²,

Özcan³

et al. 2009

Operative Dentistry

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Cervical finish line type has an influence on the marginal adaptation of Y-TZP restorations. Both shoulder and mini-chamfer exhibited the least marginal opening values for zirconia crowns and can be recommended for clinical applications. SUMMARYThe current study evaluated the effect of different cervical finish line designs on the marginal adaptation of a zirconia ceramic. Four different marginal finish lines (c: chamfer, mc: mini-chamfer, fe: feather-edge and s: rounded shoulder) were prepared on phantom incisors. Die models for each preparation group (N=28, n=7 per finish line design group) were made of epoxy resin. Y-TZP (ICE Zirkon) frameworks were manufactured by a copy-milling system (Zirconzahn) using prefabricated blanks and tried on the master models for initial adaptation of the framework; they were then sintered, followed by veneering (Zirconzahn). The finished crowns were cemented with a polycarboxylate cement (Poly F) under 300 g load and ultrasonically cleaned. The specimens were sliced and the marginal gap was measured, considering absolute marginal opening (AMO) and marginal opening (MO) for each coping under a stereomicroscope with image processing software (Lucia). The measurements were statistically analyzed using the Kruskal Wallis, Mann Whitney and Wilcoxon Signed Ranks tests at a significance level of α α=0.01. Means of AMO measurement (µm) for the feather-edge finish line (87 ± 10) was significantly lower than that of the chamfer (144 ± 14), shoulder (114 ± 16) and mini-chamfer finish line types (114 ± 11) (p<0.01). Means of MO measurements was the lowest for feather-edge finish line (68 ± 9) (p<0.01) and then, in ascending order, shoulder (95 ± 9), mini-chamfer (97 ± 12) and chamfer (128 ± 10). The cervical finish line type

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Analysis of the compressive strain below the removable and fixed prosthesis in the posterior mandible using a digital image correlation method

Tanasić

Milić‐Lemić

Tihaček-Šojić

et al. 2011

Biomech Model Mechanobiol

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It was the purpose of this study to determine and analyse strains in the bone of posterior mandible below the removable and fixed partial dentures using Digital Image Correlation Method. Dried mandible with shortened dental arch (Kennedy Class 1) was used in the experiment. The mandible model was prepared for accepting two types of restorations for bilaterally missing molars conventional therapy, and removable and fixed partial dentures were manufactured following standard prosthetic protocol. The models with prosthetic restorations placed in situ were subjected to loading of 50-300 N, and photographed using two digital cameras as part of the digital image correlation method equipment. Afterwards, the obtained data for strains within restored mandible during loading ciclus were analysed in the software Aramis and graphically presented. Percentage size of the mandible strains within the line section are from 0.14 to 0.19% for the removable partial denture experimental model and 0-0.14% for the fixed partial denture experimental model. The study has demonstrated that Digital Image Correlation method can be used to measure strain on the mandible surface and replacements during loading and that from biomechanical perspective both therapeutic modalities can be equally useful for the restoration of the mandible with bilaterally distal edentulous spaces.

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Preparation design and margin distortion in porcelain-fused-to-metal restorations

Cited by 26 publications

References 9 publications

Effect of Finish Line on Marginal Fit of Sintered Gold Copings

Effect of Finish Line on Marginal Fit of Sintered Gold Copings

Influence of Cervical Finish Line Type on the Marginal Adaptation of Zirconia Ceramic Crowns

Analysis of the compressive strain below the removable and fixed prosthesis in the posterior mandible using a digital image correlation method

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