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<p>The mechanical stability of implant abutments plays a pivotal role in ensuring the long-term success and functional longevity of implant-supported prosthetic rehabilitations. Variations in abutment design and manufacturing, particularly between solid and two-piece (through-screw) configurations, can directly influence their mechanical resistance under loading, thereby impacting clinical outcomes. The present study aimed to compare the compressive strength of solid and two-piece Morse taper abutments subjected to oblique loading. Two groups of Morse taper analogs were tested: Group 1 consisted of straight solid abutments (4.5&#xa0;mm diameter, 1.5&#xa0;mm collar, 6&#xa0;mm height), while Group 2 comprised two-piece abutments of identical dimensions incorporating a through-screw. Each analog-abutment assembly was embedded in self-curing acrylic resin and torqued according to manufacturer specifications (32&#xa0;N for solid abutments and 15&#xa0;N for two-piece abutments). Axial compressive load testing was performed using a universal testing machine, applying force at a 30° angle and a crosshead speed of 0.5&#xa0;mm/min until visible deformation occurred. Solid abutments showed significantly higher resistance to oblique compressive loads (<i>p</i> = 0.019), with a mean of 1032.81&#xa0;N compared to 593.66&#xa0;N for the two-piece abutments. This indicates that solid abutments withstand nearly twice the load of the two-piece design under the tested conditions. Solid Morse taper abutments demonstrated superior mechanical performance under oblique compressive loads compared to two-piece abutments with a through-screw. These findings suggest that in clinical situations requiring higher compressive resistance, solid abutments may provide greater stability and durability for implant-supported prostheses.</p>

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Comparative analysis of mechanical strength between one-piece and two-piece morse taper abutments: an in vitro study

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Andre Lucas-Filho,
  • Luiz Alves de Oliveira-Neto,
  • Rafael Scaf de Molon,
  • Rubens Moreno de Freitas

摘要

The mechanical stability of implant abutments plays a pivotal role in ensuring the long-term success and functional longevity of implant-supported prosthetic rehabilitations. Variations in abutment design and manufacturing, particularly between solid and two-piece (through-screw) configurations, can directly influence their mechanical resistance under loading, thereby impacting clinical outcomes. The present study aimed to compare the compressive strength of solid and two-piece Morse taper abutments subjected to oblique loading. Two groups of Morse taper analogs were tested: Group 1 consisted of straight solid abutments (4.5 mm diameter, 1.5 mm collar, 6 mm height), while Group 2 comprised two-piece abutments of identical dimensions incorporating a through-screw. Each analog-abutment assembly was embedded in self-curing acrylic resin and torqued according to manufacturer specifications (32 N for solid abutments and 15 N for two-piece abutments). Axial compressive load testing was performed using a universal testing machine, applying force at a 30° angle and a crosshead speed of 0.5 mm/min until visible deformation occurred. Solid abutments showed significantly higher resistance to oblique compressive loads (p = 0.019), with a mean of 1032.81 N compared to 593.66 N for the two-piece abutments. This indicates that solid abutments withstand nearly twice the load of the two-piece design under the tested conditions. Solid Morse taper abutments demonstrated superior mechanical performance under oblique compressive loads compared to two-piece abutments with a through-screw. These findings suggest that in clinical situations requiring higher compressive resistance, solid abutments may provide greater stability and durability for implant-supported prostheses.