The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study

Nemane, Vaishali; Akulwar, Ravikumar Suryakanth

doi:10.7860/jcdr/2015/12574.6283

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…14,15 Commonly, there are two types of preparation; preparation with finish lines called horizontal and preparation without finish lines which is described as vertical or feather-edge preparation. 16,17 Vertical preparation is usually indicated for periodontally involved abutments for fixed prostheses as this approach may be more conservative than horizontal preparation under different clinical situations. 18 In horizontal preparations, the dentist places a well-defined finish line which is registered during impression making and replicated in the working model.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of zirconia and zirconia‐reinforced glass ceramic systems fabricated for minimal invasive preparations using a novel standardization method

Kasem

Sakrana

Ellayeh

et al. 2020

J Esthet Restor Dent

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Objective: Currently, minimal invasive approaches combining less invasive finish line preparations and reduced ceramic thickness are required. The aim of this study was to evaluate the fracture resistance of two ceramic systems fabricated with two preparation designs using CAD/CAM standardization technology. Materials and methods: Forty intact human maxillary premolars were divided into two main groups according to the preparation technique. Group H (Horizontal): teeth with shoulder finish line and group V (Vertical): teeth with feather edge. Each main group was subdivided randomly into two subgroups according to the material used. Group CD (Celtra Duo) zirconia-reinforced glass ceramics and group K (KATANA) monolithic zirconia. CAD/CAM was used for standardization of natural teeth preparation. After cementation using self-adhesive resin cement, all specimens were subjected to 5000 thermal cycles and then were loaded until fracture. Failure types were evaluated using Stereomicroscopy and Scanning Electron Microscopy (SEM). Results: Nonsignificant; the higher mean value was recorded with VCD group (482.5 ± 103.8 N) and VK group (1347.6 ± 177.4 N) vs HCD group (471 ± 107.6 N) and HK group (1255.6 ± 121.3 N). SEM findings showed that fractures occurred mainly at the occlusal side of the crowns. Conclusions: Vertical preparation showed a promising alternative to horizontal preparation. Moreover, both Celtra Duo and KATANA crowns can be used in premolar area with 0.5 mm margin thickness. Clinical significance: Zirconia-reinforced glass ceramic and monolithic zirconia crowns may not necessitate the preparation of invasive finish lines as the type of finish line did not impair the strength after aging conditions

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Section: Introductionmentioning

confidence: 99%

Evaluation of zirconia and zirconia‐reinforced glass ceramic systems fabricated for minimal invasive preparations using a novel standardization method

Kasem

Sakrana

Ellayeh

et al. 2020

J Esthet Restor Dent

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“…On the other hand, some investigators advocated the use of shoulder finish line which resisted distortion and had less marginal discrepancy than the chamfer finish line [25,26]. While other investigators found improved marginal fit with chamfer margins compared to shoulders [27,28], and others found that the best marginal seal is obtained by knife-edge margins [21,29].…”

Section: Introductionmentioning

confidence: 99%

Effect of finish line design and cement space thickness on the marginal accuracy of monolithic zirconia crowns

Eldamaty

AbdElaziz

El-Kouedi

et al. 2020

BDS

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Objective: The purpose of this study was to evaluate the effect of finish line design and cement space thickness on the marginal accuracy of monolithic zirconia crowns. Materials and methods: Thirty crowns were fabricated from translucent zirconia (inCoris TZI) using Cerec in-Lab system and divided into three main groups (10 each) according to the finish line type of the die (knife-edge, chamfer, and shoulder). Every group was divided into two subgroups (5 each) according to cement space thickness (20 and50μm). Optical impressions were taken for the dies using the Cerec scanner and cement space was set twice for every finish line design; 20 and 50 μm. The completed crowns were cemented to the dies and the marginal gap was evaluated. The collected data was statistically analyzed using Mann-Whitney U test and Kruskal-Wallis test and the significance level was set at P ≤ 0.05. Results: Regarding the marginal gap; there was no statistically significant difference between different finish line designs or between different cement space thicknesses. Conclusion: Neither finish line design nor cement space thickness has an effect on the marginal gap of inCoris TZI crowns.KeywordsCement space; Finish line; Marginal fit; Monolithic zirconia.

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“…The factors that play an important role in the long-term success of crowns are the materials of the crowns, the margins or finish lines of the prepared tooth, and the marginal integrity of said tooth [ 6 ]. With increasing demand for aesthetics, crowns without metallic cores or substructures are widely used in clinical practice, with studies concluding that crowns with favorable finish lines provide adequate stress distribution, resulting in maximum and improved durability [ 7 ].…”

Section: Discussionmentioning

confidence: 99%

Stress Distribution on Prepared Tooth With Shoulder and Radial Shoulder Margin to Receive Crowns of Three Different Materials: A Finite Element Analysis

Hegde,

Deb,

Almudarris

et al. 2024

Cureus

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Aim and background This study aims to determine the stress distribution on the prepared tooth at the margins with shoulder and radial shoulder finish lines when an occlusal load of 300N was applied to ceramic, zirconia, and polyether ether ketone (PEEK) crowns. Materials and methods Six models of mandibular first molar teeth were fabricated. The tooth models were subdivided into two groups with shoulder and radial shoulder margins, respectively (n = 18). The teeth were restored with three different prosthetic crown materials (ceramic, zirconia, and PEEK). To simulate the typical forces experienced by a prosthetic crown material in a lower posterior tooth during chewing and biting, an occlusal load of 300N was applied to each of the samples, and the maximum principal stress (Pmax) and von Mises stress were calculated, respectively. These samples were then compared and evaluated to determine the material best suited as a prosthetic crown material of choice for a lower posterior tooth. Results Among the materials used, the maximum principal stress value was the least in PEEK crowns. The von Mises stress value was highest for the zirconia crown with shoulder margin and was least for the PEEK crown with a similar margin. Conclusion PEEK as a crown material was found to be a better choice for lower posterior teeth as there was the least maximum principal stress at the margin, irrespective of either shoulder or radial shoulder finish line used.

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The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study

Cited by 9 publications

References 9 publications

Evaluation of zirconia and zirconia‐reinforced glass ceramic systems fabricated for minimal invasive preparations using a novel standardization method

Evaluation of zirconia and zirconia‐reinforced glass ceramic systems fabricated for minimal invasive preparations using a novel standardization method

Effect of finish line design and cement space thickness on the marginal accuracy of monolithic zirconia crowns

Stress Distribution on Prepared Tooth With Shoulder and Radial Shoulder Margin to Receive Crowns of Three Different Materials: A Finite Element Analysis

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