Chipping fracture resistance of dental CAD/CAM restorative materials: Part I – Procedures and results

Restorative materials are experiencing an extensive upgrade thanks to the use of chairside Computer-aided design/computer-assisted manufacturing (CAD/CAM) restorations. Therefore, due to the variety offered in the market, choosing the best material could be puzzling for the practitioner. The clinical outcome of the restoration is influenced mainly by the material and its handling than by the fabrication process (i.e., CAD/CAM). Information on the restorative materials performances can be difficult to gather and compare. The aim of this article is to provide an overview of chairside CAD/CAM materials, their classification, and clinically relevant aspects that enable the reader to select the most appropriate material for predictable success.

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Fracture Resistance of Molar Teeth Restored by Endocrown and Onlay CAD/CAM Monolithic Ceramic Materials. An In-vitro Study

Al-Azhar Journal of Dental Science ◽

10.21608/ajdsm.2020.120665 ◽

2020 ◽

Vol 23 (2) ◽

pp. 95-102

Keyword(s):

Fracture Resistance ◽

In Vitro Study ◽

Ceramic Materials ◽

Vitro Study ◽

Cad Cam ◽

Molar Teeth

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Fracture Resistance in Non-Vital Teeth: Absence of Interproximal Ferrule and Influence of Preparation Depth in CAD/CAM Endocrown Overlays—An In Vitro Study

Materials ◽

10.3390/ma15020436 ◽

2022 ◽

Vol 15 (2) ◽

pp. 436

Author(s):

Lucía Barallat ◽

María Arregui ◽

Sandra Fernandez-Villar ◽

Blanca Paniagua ◽

Andrés Pascual-La Rocca

Keyword(s):

Fracture Strength ◽

Fracture Resistance ◽

Testing Machine ◽

Compressive Force ◽

Ample Evidence ◽

Alveolar Crest ◽

Cad Cam ◽

Group A ◽

Group B ◽

Group D

There is ample evidence to support the use of endocrowns to restore endodontic teeth. However, the influence of the position of the interproximal margins on fracture strength has not yet been studied. The aim was to determine the relationship between the apicocoronal position of the interproximal restorative margins and fracture resistance in nonvital teeth restored with CAD/CAM endocrown overlays. Forty extracted human maxillary premolars were prepared for endocrown overlay restorations without ferrule on the interproximal aspects and classified according to the position of the interproximal restoration margins in relation to the alveolar crest: 2 mm (group A), 1 mm (group B), 0.5 mm (group C), and 0 mm (group D). Fracture strength was measured using a universal testing machine applying a compressive force to the longitudinal tooth axis. Group A had a mean fracture resistance of 859.61 (±267.951) N, group B 1053.9 (±333.985) N, group C 1124.6 (±291.172) N, and group D 780.67 (±183.269) N, with statistical differences between groups. Group C had the highest values for fracture strength compared to the other groups (p < 0.05). The location of the interproximal margins appears to influence the fracture resistance of CAD/CAM endocrown overlays. A distance of 0.5 mm between the interproximal margin and the alveolar crest was associated with increased fracture resistance.

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Review of Marginal Adaptation and Fracture Resistance of Computer Aided Design/Computer Aided Manufacturer (CAD‐CAM) Fabricated Endo-crowns

Journal of Pharmaceutical Research International ◽

10.9734/jpri/2021/v33i55a33823 ◽

2021 ◽

pp. 196-208

Author(s):

Abdulrahman Alhaddad ◽

Samar Abuzinadah ◽

Abdullah Al-Otaibi ◽

Abrar Alotaibi ◽

Mohsen Alfkih ◽

...

Keyword(s):

Computer Aided Design ◽

Fracture Resistance ◽

Systemic Review ◽

Marginal Adaptation ◽

Marginal Gap ◽

Computer Aided ◽

Cad Cam ◽

Electronic Database Search ◽

Cause Of Failure

Background: Zirconia-based restorations have become more popular in dentistry during the last two decades. Patients choose metal-free restorations, preferring materials with similar attributes to natural teeth and similar light scattering characteristics, resulting in a nice esthetic appearance. Restoring a root canal treated teeth is one of the hot topics today. endo crown materials can be either; feldspathic, glass-ceramic, monolithic hybrid ceramic or composite material. Considering the marginal gap of endocrown, an important cause of failure of treatment, the current study evaluated the marginal gap of CAD‐CAM concocted endo-crowns. Materials and Methods: This research is an analysis systemic review study was conducted between January 2020 and October 2021. We followed the PRISMA principles and recorded this systematic review using the PROSPERO database to find and identify published literature related to the marginal adaptation of CAD-CAM-fabricated endocrown. The search will include all relevant articles through the end of 2021. Finally, 24 papers on marginal clearance and fracture resistance in coronary arteries were reviewed. Results: The electronic database search yielded 98 studies that were relevant. After cross-referencing, further seven studies were added. After a full-text analysis and duplicate reduction, 74 of the 98 articles were eliminated. 5 clinical (prospective) studies, 19 in vitro studies were found. Conclusion: This analysis of the recent literature on the marginal seating integrity and fracture resistance of CAD/CAM made-up endo-crowns showed that the endo-crown had superior marginal seating integrity than classical full crown. CAM/CAM showed statistically significant higher mean fracture resistance than MAD/MAM.

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