ArticleBMC oral health2024
The effect of two preparation designs on the fracture resistance and marginal adaptation of two types of ceramic crowns using CAD/CAM technology (In vitro study).
Article in BMC oral health, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- Trial
- Quantitative and Color-Coded Assessment of Crown Preparation Using a 3D-Printed Channel and Hole Guide: A Pilot Comparison With Conventional Guides.Journal of dental education · 2026Article
- Evaluating micro-CT as a tool for advanced research in prosthetic dentistry: systematic review and meta-analysis.Odontology · 2026Article
- Comparison of marginal gap in implant-supported hybrid nanoceramic crowns fabricated by additive vs. subtractive manufacturing.BMC oral health · 2026Article
- Accuracy of Marginal and Internal Adaptation of Advanced Lithium Disilicate Crowns Using Different Margin Designs (In Vitro Study).International journal of dentistry · 2026Article
- Narrative Review of Lithium Disilicate Veneers in Esthetic Dentistry: Current Perspectives and Clinical Case Report.Case reports in dentistry · 2026Article
- Post fatigue fracture resistance of lithium disilicate and zirconia crowns: vertical versus horizontal preparations (an in vitro study).The Saudi dental journal · 2025Article
- The Impact of Thermocycling on the Marginal Discrepancy of Zirconia CAD/CAM Generation on Central Incisors: AnInternational journal of clinical pediatric dentistry · 2025Article
- Multifunctional resin-matrix ceramic: synergistic mechanical-biological optimization and novel strategies for translational research.RSC advances · 2025Review
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3 authors.
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Abstract
backgroundRecently, prosthodontic approaches involve more conservative procedures that include less invasive finish line preparations that use less ceramic thickness. AIM OF THE STUDY: This in vitro study aimed to evaluate the effect of vertical preparation and modified vertical preparation designs on the marginal adaptation and fracture resistance of two types of ceramic crowns using CAD/CAM technology. MATERIALS AND
methodsTwo typodont maxillary first premolars were embedded in acrylic resin. Forty positive replicas of epoxy resin dies were used that were divided into two groups depending on the preparation design (n = 20); Group V (Vertical): dies with feather edge finish line and Group MV (Modified vertical): dies with feather edge finish line, where a reverse shoulder of 1 mm depth was placed on the buccal surface 1.5 mm from the occlusal surface. Each group was further subdivided into two subgroups according to the type of ceramic material (n = 10): Subgroup Va and subgroup MVa for lithium disilicate (e.max CAD) and subgroup Vb and subgroup MVb for zirconia (zolid ht+). Crown restorations were made with CAD-CAM technology. The marginal adaptation was assessed using a stereomicroscope both prior to cementation and after cementation and aging. Fracture resistance was tested with a universal testing machine, and the data were statistically analyzed.
resultsMarginal adaptation showed no significant differences between subgroups before or after cementation and aging. Three-way ANOVA indicated that preparation design (p = 0.516) and material (p = 0.269) had no significant effect, but cementation had a significant effect (p < 0.0001) on the marginal adaptation. According to two-way ANOVA test, Subgroup (MVb) showed the highest result followed by subgroup (Vb) and subgroub (MVa) and the least was subgroub (Va). Fracture modes showed no significant differences among the subgroups (p = 0.982).
conclusionsMarginal adaptation of lithium disilicate and zirconia crowns remained clinically acceptable regardless of preparation design. While the modified vertical preparation with a reverse shoulder notably enhanced the fracture resistance of both materials, with zirconia demonstrating superior fracture resistance compared to lithium disilicate with average values exceeding premolar biting force.
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