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