ArticleBMC oral health2025
Fracture resistance, failure mode and restorability of CAD CAM Zirconia endocrowns with different pulpal extension depths bonded to maxillary molars: an in-vitro study.
Article in BMC oral health, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Comparative in vitro evaluation of sonic, passive ultrasonic, and Er: YAG laser-activated irrigation on Enterococcus faecalis reduction and smear layer/debris removal in root canals.BMC oral health · 2026Article
- Thermo-mechanical loading of innovative "Mini-skirt" preparation design versus conventional full-coverage maxillary central incisor preparation design: an in vitro study.BMC oral health · 2026Article
- Fracture resistance of maxillary lateral incisors: effects of fiber post dimensions, material, and surface treatment.BMC oral health · 2026Article
- Fracture behavior of endodontically treated premolars restored with direct and indirect restorations: an in vitro study.BMC oral health · 2026Article
- Three-dimensional-printed endocrowns: Does increasing intracoronal depth improve strength at the expense of fracture severity?Journal of conservative dentistry and endodontics · 2026Article
- Evaluation of the marginal and internal fit of endocrown restorations fabricated by the CAD/CAM system using additive manufacturing technique.Clinical oral investigations · 2026Article
- In-vitro comparison of fracture resistance and failure patterns of endocrowns versus post-and-core restorations in maxillary central incisors with and without ferrule.BMC oral health · 2026Article
- Fracture resistance of CAD-CAM ceramic versus PFM endocrowns in cariously extracted mandibular Teeth: AnBioinformation · 2025Article
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6 authors.
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Abstract
backgroundPulpal extension depth (PED) is critical for endocrowns restored teeth stability and longevity. There is a conflicting result regarding the minimum PED needed for the success of endocrowns. The aim of the current study was to compare Fracture resistance, failure mode, and restorability of CAD-CAM zirconia endocrowns with different pulpal extension depths bonded to maxillary molars. MATERIALS AND
methodsForty maxillary 1st molars were selected, decoronated, and randomly divided into 4 main groups (n = 10) according to the PED measured from the pulpal floor to the occlusal end of the wall height into; group D2, PED was 2 mm, group D3, PED was 3 mm, group D4, PED was 4 mm, group D5 PED was 5 mm. Teeth were prepared and secured in resin dies with pseudo periodontal ligament. Specimens from all groups were individually scanned using an intra oral digital scanner. Monolithic zirconia endocrowns were constructed and bonded to their corresponding. Following thermal cycling, each specimen was axially loaded in a universal testing machine at a 0.5 mm/min crosshead speed. Failure modes were inspected, and restorability of specimens was recorded. Data was collected, tabulated, and statistically analyzed.
resultsDescriptive statistics displayed higher mean value of the D2 group (3657 1673.8 N) followed by the D3 group (3009.3 853.5 N), then the D4 group (2087.3 413.9 N) and finally the D5 group (1972.7 ±330.4 N). At a 95% confidence level, one-way analysis of variance (ANOVA) revealed significant differences between tested groups. (P = 0.014). Regarding failure mode, D2 recorded 100% restorable failures, followed by D3 (90%) and D4 (60%), while the least was D5 (50%).
conclusionsEndocrowns with 2 mm PED recorded the highest fracture resistance and the highest restorable failure modes. Endocrowns with 5 mm PED recorded the lowest fracture resistance and the lowest restorable failure modes. Tall walls should be shortened during the preparation of endocrowns in maxillary molars.
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