Clinical study of the internal gaps of zirconia and metal frameworks for fixed partial dentures

Wettstein, Fabian; Sailer, Irena; Roos, Małgorzata; Hämmerle, Christoph H. F.

doi:10.1111/j.1600-0722.2008.00527.x

Cited by 123 publications

(130 citation statements)

References 26 publications

(43 reference statements)

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“…Studies that measured the marginal gap of three-unit metal-ceramic FPDs in vivo reported values between 67 to 85 µm. 17,30 These values are slightly higher than the mean marginal gap value of the zirconia-based FPD investigated in the present study. This difference may also be related to differences in the gap measurement methodology and to the fact that the present study was carried out in the laboratory.…”

Section: Discussioncontrasting

confidence: 42%

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

et al. 2013

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The objective of the study was to measure the marginal and internal fit of zirconia-based all-ceramic three-unit fixed partial dentures (FPDs) (Y-TZP -LAVA, 3M-ESPE), using a novel methodology based on micro-computed tomography (micro-CT) technology. Stainless steel models of prepared abutments were fabricated to design FPDs. Ten frameworks were produced with 9 mm² connector cross-sections using a LAVA TM CAD-CAM system. All FPDs were veneered with a compatible porcelain. Each FPD was seated on the original model and scanned using micro-CT. Files were processed using NRecon and CTAn software. Adobe Photoshop and Image J software were used to analyze the crosssectional images. Five measuring points were selected, as follows: MG -marginal gap; CA -chamfer area; AW -axial wall; AOT -axio-occlusal transition area; OA -occlusal area. Results were statistically analyzed by Kruskall-Wallis and Tukey's post hoc test (α = 0.05). There were significant differences for the gap width between the measurement points evaluated. MG showed the smallest median gap width (42 µm). OA had the highest median gap dimension (125 µm), followed by the AOT point (105 µm). CA and AW gap width values were statistically similar, 66 and 65 µm respectively. Thus, it was possible to conclude that different levels of adaptation were observed within the FPD, at the different measuring points. In addition, the micro-CT technology seems to be a reliable tool to evaluate the fit of dental restorations.

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Section: Discussioncontrasting

confidence: 42%

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

et al. 2013

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“…A possible explanation could be the misfit of these prototype frameworks. In a RCT comparing metal-ceramic and densely sintered zirconia FDPs [17], the fit of the frameworks was analyzed prior to the insertion of the reconstruction [42]. It was demonstrated that milled zirconia frameworks exhibited larger internal gaps than those constructed using conventional metal-ceramic techniques.…”

Section: Discussionmentioning

confidence: 99%

All-ceramic or metal-ceramic tooth-supported fixed dental prostheses (FDPs)? A systematic review of the survival and complication rates. Part II: Multiple-unit FDPs

et al. 2015

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d e n t a l m a t e r i a l s 3 1 ( 2 0 1 5 ) [624][625][626][627][628][629][630][631][632][633][634][635][636][637][638][639] Available online at www.sciencedirect.com ScienceDirect j o u r n a l h o m e p a g e : w w w . i n t l . e l s e v i e r h e a l t h . c o m / j o u r n a l s / d e m a ReviewAll-ceramic or metal-ceramic tooth-supported fixed dental prostheses (FDPs)? A systematic review of the survival and complication rates. d e n t a l m a t e r i a l s 3 1 ( 2 0 1 5 ) 624-639 625(12.9%) compared to metal-ceramic FDPs (0.6%) and densely sintered zirconia FDPs (1.9%) in 5 years in function. However, the incidence of ceramic fractures and loss of retention was significantly (p = 0.018 and 0.028 respectively) higher for densely sintered zirconia FDPs compared to all other types of FDPs.Conclusions. Survival rates of all types of all-ceramic FDPs were lower than those reported for metal-ceramic FDPs. The incidence of framework fractures was significantly higher for reinforced glass ceramic FDPs and infiltrated glass ceramic FDPs, and the incidence for ceramic fractures and loss of retention was significantly higher for densely sintered zirconia FDPs compared to metal-ceramic FDPs.

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“…The accuracy of this model influences the fit or the restorations which is a major factor for longevitiy of the restoration (Wettstein, Sailer, Roos, & Hammerle, 2008) (Perakis, Belser, & Magne, 2004) (Persson, ODEN, ANDERSSON, & Sandborgh-Englund, 2009). …”

Section: Introductionmentioning

confidence: 99%

Accuracy of complete-arch dental impressions: A new method of measuring trueness and precision

Ender

Mehl

2013

The Journal of Prosthetic Dentistry

495

429

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STATEMENT OF PROBLEM: A new approach to both 3-dimensional (3D) trueness and precision is necessary to assess the accuracy of intraoral digital impressions and compare them to conventionally acquired impressions. PURPOSE: The purpose of this in vitro study was to evaluate whether a new reference scanner is capable of measuring conventional and digital intraoral complete-arch impressions for 3D accuracy. MATERIAL AND METHODS: A steel reference dentate model was fabricated and measured with a reference scanner (digital reference model). Conventional impressions were made from the reference model, poured with Type IV dental stone, scanned with the reference scanner, and exported as digital models. Additionally, digital impressions of the reference model were made and the digital models were exported. Precision was measured by superimposing the digital models within each group. Superimposing the digital models on the digital reference model assessed the trueness of each impression method. Statistical significance was assessed with an independent sample t test (=.05). RE-SULTS: The reference scanner delivered high accuracy over the entire dental arch with a precision of 1.6 ±0.6 µm and a trueness of 5.3 ±1.1 µm. Conventional impressions showed significantly higher precision (12.5 ±2.5 µm) and trueness values (20.4 ±2.2 µm) with small deviations in the second molar region (P<.001). Digital impressions were significantly less accurate with a precision of 32.4 ±9.6 µm and a trueness of 58.6 ±15.8µm (P<.001). More systematic deviations of the digital models were visible across the entire dental arch. CONCLUSIONS: The new reference scanner is capable of measuring the precision and trueness of both digital and conventional complete-arch impressions. The digital impression is less accurate and shows a different pattern of deviation than the conventional impression. Methods: A steel reference model was scanned with the reference scanner to evaluate precision and trueness. The reference model then was used to perform five conventional impressions with a polyvinylsiloxanether material (Identium, Kettenbach) in a putty and wash technique with standard stock trays (ASA Permalock, ASA Dental). The conventional impressions were poured with Type IV stone (CamBase, Dentona) and scanned with the reference scanner. Five digital impressions with a optical intraoral scanning system (CEREC AC, Sirona) were made. In each group, the models were superimposed and the differences computed with a signed nearest neighbour method. The 90-10%/2 percentile of the differences from each comparison was taken to compute the mean value for precision. The trueness of each impression method was assessed through superimposition of the impressions with the refefence scan of the steel reference model. Results:The reference scanner delivers an accuracy with 1.6±0.6 µm for precision and 5.3±1.1 µm for trueness over a full dental arch scan. The conventional impression method shows significant higher (p<0.001) precision (12.5±2.5 µm) and trueness (20....

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Clinical study of the internal gaps of zirconia and metal frameworks for fixed partial dentures

Cited by 123 publications

References 26 publications

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

All-ceramic or metal-ceramic tooth-supported fixed dental prostheses (FDPs)? A systematic review of the survival and complication rates. Part II: Multiple-unit FDPs

Accuracy of complete-arch dental impressions: A new method of measuring trueness and precision

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