The Effects of Bevel Angulation on Marginal Integrity

Kashani, Hooshang; Khera, Satish C.; Gulker, I

doi:10.14219/jada.archive.1981.0431

Cited by 33 publications

(17 citation statements)

References 24 publications

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“…The mean overall 3-D results ranged from 36 to 53 microns for the different groups (Table 4). These results coincide well with earlier publications on conventional castings on abutment teeth, presenting a mean value from 50 up to some few hundred microns of marginal openings (McLean & von Fraunhofer, 1971;Willis & NichoUs, 1980;Kashani, Khera & Gulker, 1981;Fransson, Oilo & Gjeitanger, 1985;Schiffleger etal, 1985;Matty, Tjan & Fox, 1989;Karlsson, 1993;GeVoard etal, 1994). A major part of the present 3-D displacement was due to horizontal distortion, whereas the vertical gaps were of smaller magnitudes.…”

Section: Discussionsupporting

confidence: 91%

Three‐dimensional distortion of gold alloy castings and welded titanium frameworks. Measurements of the precision of fit between completed implant prostheses and the master casts in routine edentulous situations

Jemt

1995

J of Oral Rehabilitation

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Thirty routine patients, provided with fixed prostheses supported by osseointegrated Brånemark implants in edentulous lower jaws, were arranged into three different groups with regard to design of the metal framework. Ten patients received cast gold alloy frames and the other two groups were provided with two different designs of welded titanium frames. The fit of the completed prostheses was measured in three dimensions (3-D) in relation to the master cast, by means of a photogrammetric technique, prior to insertion. Mean 3-D distortion of the centre point of the gold cylinder was 42 (s.d. 8) microns for the cast framework. The corresponding mean distortion for the two designs of titanium frameworks was 43 (s.d. 16) and 36 (s.d. 10) microns, respectively. Least distortion was observed in vertical direction for all three designs. None of the different designs of metal frames showed a significantly better fit (P > 0.05), but the cast and oldest titanium framework design presented a much wider range of distortion. This indicated a higher risk of sectioning and resoldering during the fabrication of the prostheses as compared to the more consistently fabricated prostheses, with a new titanium framework design.

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Section: Discussionsupporting

confidence: 91%

Three‐dimensional distortion of gold alloy castings and welded titanium frameworks. Measurements of the precision of fit between completed implant prostheses and the master casts in routine edentulous situations

Jemt

1995

J of Oral Rehabilitation

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“…More vibration and resistance of the milling axis during preparation could affect the accuracy of the milling procedure. Furthermore, the castable resin pattern of this study, used in casting specimens instead of the wax pattern, might attribute to the smaller marginal gap values of the casting group than is reported in other studies [29,36]. …”

Section: Discussionmentioning

confidence: 71%

“…Smaller marginal gaps produce less gingival irritation [23,24] and cement washout [25,26], improving the clinical outcome and longevity of the restoration [27,28,29,30,31]. Subgingival marginal discrepancies in implant-supported restorations are related to changes in the ecologic environment, that may contribute to the occurrence of peri-implantitis or to bone loss in the marginal portion of the implant [24,27].…”

Section: Introductionmentioning

confidence: 99%

Marginal Accuracy and Internal Fit of 3-D Printing Laser-Sintered Co-Cr Alloy Copings

et al. 2017

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Abstract:Laser sintered technology has been introduced for clinical use and can be utilized more widely, accompanied by the digitalization of dentistry and the development of direct oral scanning devices. This study was performed with the aim of comparing the marginal accuracy and internal fit of Co-Cr alloy copings fabricated by casting, CAD/CAM (Computer-aided design/Computer-assisted manufacture) milled, and 3-D laser sintered techniques. A total of 36 Co-Cr alloy crown-copings were fabricated from an implant abutment. The marginal and internal fit were evaluated by measuring the weight of the silicone material, the vertical marginal discrepancy using a microscope, and the internal gap in the sectioned specimens. The data were statistically analyzed by One-way ANOVA (analysis of variance), a Scheffe's test, and Pearson's correlation at the significance level of p = 0.05, using statistics software. The silicone weight was significantly low in the casting group. The 3-D laser sintered group showed the highest vertical discrepancy, and marginal-, occlusal-, and averageinternal gaps (p < 0.05). The CAD/CAM milled group revealed a significantly high axial internal gap. There are moderate correlations between the vertical marginal discrepancy and the internal gap variables (r = 0.654), except for the silicone weight. In this study, the 3-D laser sintered group achieved clinically acceptable marginal accuracy and internal fit.

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“…While a trend toward decreased crown elevation with die-spacing seems clear, the many technique variables involved in these stages make a clear assessment of the magnitude of the change difficult. Differences in margin design have been shown in experimental 22 and theoretical studies [23][24][25][26] to result in differences in crown seating. Increased convergence angle also favo u r e d decreased crown elevation in the study of Eames et al 2 Studies have further demonstrated variations in the seating of cast restorations due to the various materials and techniques involved in the impression, die construction and casting procedures.…”

Section: Die-spacing and Crown Seatingmentioning

confidence: 99%

The effects of die‐Spacidng on post‐cementation crown elevation and retention

Carter¹,

Wilson

1997

Australian Dental Journal

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This paper reviews the relevant dental literature concerning the effect of die-spacing on crown elevation and pre-and post-cementation crown retention. Techniques of providing die-spacing and measurement of the thickness of die-spacer are discussed. A review of the role of the provision of a cement space in reducing post-cementation crown elevation is presented. Factors which may affect crown retention prior to and following cementation are also reviewed. The influence of variables in techniques and experimental design on the results of the studies reviewed is discussed.Key words: Die-spacing, crown elevation, pre-cementation retention, post-cementation retention.(Received for publication January 1996. Revised March 1996 Accepted April 1996.) IntroductionFull crowns frequently do not seat with minimal m a r ginal discrepancy following cementat i o n .

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The Effects of Bevel Angulation on Marginal Integrity

Cited by 33 publications

References 24 publications

Three‐dimensional distortion of gold alloy castings and welded titanium frameworks. Measurements of the precision of fit between completed implant prostheses and the master casts in routine edentulous situations

Three‐dimensional distortion of gold alloy castings and welded titanium frameworks. Measurements of the precision of fit between completed implant prostheses and the master casts in routine edentulous situations

Marginal Accuracy and Internal Fit of 3-D Printing Laser-Sintered Co-Cr Alloy Copings

The effects of die‐Spacidng on post‐cementation crown elevation and retention

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