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Purpose <p>This in vitro study aimed to evaluate different fabrication techniques for anterior cobalt-chromium (Co-Cr) three-unit fixed dental prostheses (FDPs) and their effects on the fit of maxillary central incisor and canine abutments.</p> Materials and methods <p>Five fabrication techniques were evaluated as the experimental groups: manual wax carving and casting (Cast), milled wax and casting (CAW), 3D-printed polymers and casting (3DP), direct metal laser sintering (DMLS), and selective laser melting (SLM). Three-unit FDP frameworks were designed for the prepared maxillary central incisor and canine teeth, and Co-Cr specimens were fabricated (<i>n</i> = 10). Marginal (MDV), chamfer (CDV), axial (ADV), incisal (IDV), and overall discrepancy values (ODV) were evaluated using the silicone replica technique (SRT) and statistically analyzed using two-way analysis of variance (ANOVA)(α = 0.05).</p> Results <p>Fabrication technique significantly affected measurements (<i>p</i> &lt; 0.001), while tooth type did not. No differences in CDV, ADV, or IDV were found between canine and central incisor (<i>P</i> &gt; 0.05). The 3DP technique showed higher MDV, CDV, and ODV than others (<i>P</i> &lt; 0.05), and higher ADV than DMLS and SLM (<i>P</i> &lt; 0.05). For IDV, 3DP had higher values in canine teeth compared to all techniques, and in central teeth compared to Cast, DMLS, and SLM (<i>P</i> &lt; 0.05).</p> Conclusion <p>SLM showed a more favorable overall discrepancy than the lost-wax technique. Additionally, DMLS offers a comparable and viable alternative for fabricating anterior 3-unit FDP frameworks.</p>

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Fit of three-unit anterior fixed dental prosthesis frameworks fabricated by different manufacturing techniques

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月28日

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  • Gürel Pekkan,
  • Hilal Gülgezen Aydın,
  • Süleyman Hakan Tuna,
  • Canan Hekimoğlu

摘要

Purpose

This in vitro study aimed to evaluate different fabrication techniques for anterior cobalt-chromium (Co-Cr) three-unit fixed dental prostheses (FDPs) and their effects on the fit of maxillary central incisor and canine abutments.

Materials and methods

Five fabrication techniques were evaluated as the experimental groups: manual wax carving and casting (Cast), milled wax and casting (CAW), 3D-printed polymers and casting (3DP), direct metal laser sintering (DMLS), and selective laser melting (SLM). Three-unit FDP frameworks were designed for the prepared maxillary central incisor and canine teeth, and Co-Cr specimens were fabricated (n = 10). Marginal (MDV), chamfer (CDV), axial (ADV), incisal (IDV), and overall discrepancy values (ODV) were evaluated using the silicone replica technique (SRT) and statistically analyzed using two-way analysis of variance (ANOVA)(α = 0.05).

Results

Fabrication technique significantly affected measurements (p < 0.001), while tooth type did not. No differences in CDV, ADV, or IDV were found between canine and central incisor (P > 0.05). The 3DP technique showed higher MDV, CDV, and ODV than others (P < 0.05), and higher ADV than DMLS and SLM (P < 0.05). For IDV, 3DP had higher values in canine teeth compared to all techniques, and in central teeth compared to Cast, DMLS, and SLM (P < 0.05).

Conclusion

SLM showed a more favorable overall discrepancy than the lost-wax technique. Additionally, DMLS offers a comparable and viable alternative for fabricating anterior 3-unit FDP frameworks.