Failure load effect of molar axial wall height with CAD/CAM ceramic crowns with moderate occlusal convergence

Hoopes, Wyeth L; Cushen, S; DuVall, Nicholas; Wajdowicz, M; Brewster, John; Roberts, Howard W.

doi:10.1111/jerd.12366

Cited by 6 publications

(8 citation statements)

References 23 publications

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“…Even though there was no difference in fracture resistance between different designs in this study, the 2A3 group (3-mm high buccal and lingual walls) had the highest fracture resistance while the A0 group (no axial walls on buccal and lingual surfaces) had the lowest fracture resistance. This result was similar to the study in 2018 by Hoopes W. et al, which found that the 1-mm high axial wall had significantly lower fracture resistance compared to 2-, 3-, and 4-mm high axial wall 9 . Therefore an axial wall height of at least 2-mm is recommended when the remaining tooth structure requires strengthening, such as with a cracked tooth or with a root canal treated tooth.…”

Section: Discussionsupporting

confidence: 91%

“…A similar result was found in the study in 2018 by Hoopes et al There was no statistic difference in the fracture resistance among 2-, 3-, and 4-mm height of axial walls in which adhesive ceramics were restored on the human molar teeth with shoulder margin. 9 . The adhesive technology can compensate for the reduced axial wall height in the case of conventional techniques 9 .…”

Section: Discussionmentioning

confidence: 99%

“… 9 . The adhesive technology can compensate for the reduced axial wall height in the case of conventional techniques 9 . Even though there was no difference in fracture resistance between different designs in this study, the 2A3 group (3-mm high buccal and lingual walls) had the highest fracture resistance while the A0 group (no axial walls on buccal and lingual surfaces) had the lowest fracture resistance.…”

Section: Discussionmentioning

confidence: 99%

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Fracture resistance of bonded ceramic overlay restorations prepared in various designs

Channarong

Lohawiboonkij

Jaleyasuthumkul

et al. 2022

Sci Rep

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This study investigates fracture resistance of adhesive ceramic overlays of various designs. Forty-eight upper premolar teeth were divided into eight groups. The variations were: shoulder margins on the buccal and lingual surfaces with axial wall heights of 1, 2, or 3 mm; one shoulder margin with axial wall height of 1, 2, or 3 mm on the lingual surface and one contrabevel margin on the buccal surface; contrabevel margins on the buccal and lingual surfaces; and a control of sound teeth. Overlays were designed and fabricated with CAD/CAM using zirconia-reinforced lithium disilicate ceramic and bonded with resin cement. Samples underwent thermocycling and dynamic fatigue equivalent to 6 months of use. Compressive loading was applied until fracture, and fracture mode was analyzed. Results showed no statistical difference in fracture resistance between designs, and the fracture pattern of most was involvement of pulp tissue and below the CEJ. Fracture resistance of the restored teeth was also not statistically different from the control. All control fractures were within the dentin and above the CEJ. Overlay restorations were therefore effective in strengthening damaged teeth and imparting fracture resistance equal to sound teeth, and axial wall heights and margin types did not influence this result.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Fracture resistance of bonded ceramic overlay restorations prepared in various designs

Channarong

Lohawiboonkij

Jaleyasuthumkul

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…It is quite common for dental materials to be released on the market prior to clinical trials. Therefore, in searching for relevant information and short-term results, companies and researchers use laboratory studies which are most often fatigue tests (4-11). But when an experimental study is performed, several factors must be taken into account such as sample design, testing methods, data analysis and possible outcomes (4).…”

Section: Introductionmentioning

confidence: 99%

“…This material was first presented in 2010 as having similar elastic and adhesive properties to wet dentin (15). Despite its characteristics, studies have used other materials as a tooth substitute (8-11), such as ivory (16), acrylic resin (17,18), typodont (19), metal (20) and composite resins (21,22). However, it is known that there are differences in the failure modes obtained in different specimen forms.…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate design for in vitro mechanical testing

Piva¹,

Tribst²,

Borges³

et al. 2019

J Clin Exp Dent

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BackgroundThe goal of this study was to evaluate the influence of dental substrate simulator material, and the presence of root and periodontal ligament on the stress distribution in an adhesively-cemented monolithic crown.Material and MethodsFive (5) 3D models according to the substrate simulator material and shape were modeled with CAD software for conducting non-linear finite element analysis (FEA): Tooth with and without periodontal ligament - subgroup “pl” (groups Tooth+pl and Tooth-pl), machined tooth in epoxy-resin with and without pulp chamber - subgroup “pc” (ER+pc and ER-pc) and simplified epoxy-resin substrate without pulp chamber and roots (SiER). Next, adhesively-cemented monolithic crowns in zirconia reinforced lithium silicate were modeled over each substrate. The solids were then imported in STEP format to the analysis software and the contact between teeth and cylinder was considered perfectly bonded; whereas, the contacts involving the resin cement were considered as non-separated. The materials were considered isotropic, linearly elastic, and homogeneous. An axial load (600 N) was applied to the occlusal surface and results of maximum principal stress (MPa) on the restoration were required.ResultsFEA revealed that all evaluated subtracts showed the crown intaglio surface as the most stressed region. The average stress and stress peaks were similar for restorations cemented onto Tooth+pl, Tooth-pl and ER+pc substrates, but, 13% higher in comparison to ER-pc and SiER substrates.ConclusionsSimplified substrates can be used to evaluate posterior full crown behavior without periodontal ligaments and roots, since the rigidity of the specimen is taken into account. Key words:Finite element analysis, axial loading, computed assisted numerical analisys, monolithic crowns,methodological study.

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Axial wall height effect on failure of adhesively luted computer assisted design/computer assisted manufactured ceramic crowns on preparations containing advanced total occlusal convergence

Spriggel

DuVall

Brewster

et al. 2018

Journal of Adhesion Science and Technology

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Failure load effect of molar axial wall height with CAD/CAM ceramic crowns with moderate occlusal convergence

Abstract: These in vitro results suggest that adhesive CAD/CAM technology may compensate for less than optimal AWH.

Cited by 6 publications

References 23 publications

Fracture resistance of bonded ceramic overlay restorations prepared in various designs

Fracture resistance of bonded ceramic overlay restorations prepared in various designs

Influence of substrate design for in vitro mechanical testing

Axial wall height effect on failure of adhesively luted computer assisted design/computer assisted manufactured ceramic crowns on preparations containing advanced total occlusal convergence

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