Fracture resistance and failure patterns of 3D-printed resin and zirconia screw-retained incisor crowns on different titanium base heights in conical connection implants

Dataset Description

Research Hypothesis

The null hypothesis stated that the fracture resistance and failure modes of screw-retained implant crowns would not differ according to titanium base height (short: 4 mm vs. long: 6 mm) or restorative material (3D printed resin vs. zirconia).

Data Collection and Methods

This dataset was generated from an in vitro experimental study simulating the replacement of a maxillary central incisor with screw-retained crowns supported on conical connection implants (MIS Implants Technologies Ltd, Israel).
• Sample: 40 crowns divided into four groups (n = 10 each):
• PR4: 3D printed resin + 4 mm Ti-base
• PR6: 3D printed resin + 6 mm Ti-base
• MZ4: zirconia + 4 mm Ti-base
• MZ6: zirconia + 6 mm Ti-base
• Fabrication: Crowns were either 3D printed with resin (VarseoSmile Crown Plus) or milled from zirconia (NexxZr T). Standard surface conditioning and adhesive cementation (TheraCem, Bisco Inc.) protocols were applied.
• Aging protocol: All specimens underwent 10,000 thermocycles between 5 °C and 55 °C to simulate one year of clinical aging.
• Mechanical testing: Fracture resistance was measured under axial static load using a universal testing machine at 0.5 mm/min until failure, following ISO 14801.
• Failure analysis: Failure type was categorized under stereomicroscopy (×40) as adhesive, cohesive, or mixed.

Data Content

The dataset includes:
• Individual fracture resistance values (N) for all specimens.
• Mean and standard deviation per group.
• Results of statistical analysis (ANOVA, t-test, Weibull distribution).
• Classification of failure patterns.

Findings and Interpretation
• Zirconia crowns exhibited significantly higher fracture resistance (910–940 N) compared to 3D printed resin crowns (282–324 N).
• Longer Ti-bases (6 mm) improved resistance and structural reliability in both materials.
• Cohesive failures were the most common, particularly in zirconia and longer Ti-base groups.
• All crowns exceeded physiological masticatory load thresholds (~200 N), supporting their clinical feasibility. However, the use of longer bases is recommended for resin crowns to optimize mechanical stability.

How to Use the Data

This dataset enables:
• Reproduction and validation of experimental findings.
• Comparative analyses of restorative materials and abutment designs.
• Inclusion in systematic reviews and meta-analyses on implant-supported restorations.