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Background <p>This in vitro study aimed to compare and analysis degree of Manufacture accuracy and geometric discrepancy measurements of Cobalt-Chromium (C0-Cr) bar joint attachment supporting a mandibular complete overdenture fabricated directly by Direct Laser Sintering (DMLS) and indirectly fabricated by conventional casting of 3D printed resin pattern using Co-Cr alloys with the same reference design.</p> Methods <p>A total of twelve bar joint attachment for two implant-retained mandibular overdentures were fabricated through additive manufacturing process indirectly by using 3D printed resin pattern and directly by using DMLS (n = six for each group). All the sample specimens of metal bars were scanned and superimposed with the reference STL reference design by using the Geomagic Control X software program.</p> Results <p>There was no significant statistical difference in manufacture accuracy and geometric discrepancy in the bars fabricated by DMLS compared to indirectly 3D-printed conventional Co-Cr bars in mandibular implant retained overdenture. The Casted group has a mean of 0.1128 ± 0.006, while the DMLS group has a mean of 0.1206 ± 0.01. There was no significant difference between the groups, Regarding Internal Discrepancy, the Casted group shows a mean of 0.1659 ± 0.118, and the DMLS group has a mean of 0.1678 ± 0.035. The research indicates no significant difference between the groups for this variable.</p> Conclusion <p>No significant difference in Manufacture accuracy and geometric discrepancy of direct laser sintering versus cast 3D printed resin pattern of Co-Cr bars in mandibular implant retained complete overdenture.</p>

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Manufacture accuracy and geometric discrepancy of direct laser sintering versus cast cobalt chromium bars in mandibular implant retained overdenture: an in-vitro comparative study

  • 期刊论文

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  • 发表日期：

    2026年7月24日

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  • Ehab A. Farrag,
  • Mohammed E. El-Sayed,
  • Ahmed A. Moselhy,
  • Kawkb M. El-Tamimi

摘要

Background

This in vitro study aimed to compare and analysis degree of Manufacture accuracy and geometric discrepancy measurements of Cobalt-Chromium (C0-Cr) bar joint attachment supporting a mandibular complete overdenture fabricated directly by Direct Laser Sintering (DMLS) and indirectly fabricated by conventional casting of 3D printed resin pattern using Co-Cr alloys with the same reference design.

Methods

A total of twelve bar joint attachment for two implant-retained mandibular overdentures were fabricated through additive manufacturing process indirectly by using 3D printed resin pattern and directly by using DMLS (n = six for each group). All the sample specimens of metal bars were scanned and superimposed with the reference STL reference design by using the Geomagic Control X software program.

Results

There was no significant statistical difference in manufacture accuracy and geometric discrepancy in the bars fabricated by DMLS compared to indirectly 3D-printed conventional Co-Cr bars in mandibular implant retained overdenture. The Casted group has a mean of 0.1128 ± 0.006, while the DMLS group has a mean of 0.1206 ± 0.01. There was no significant difference between the groups, Regarding Internal Discrepancy, the Casted group shows a mean of 0.1659 ± 0.118, and the DMLS group has a mean of 0.1678 ± 0.035. The research indicates no significant difference between the groups for this variable.

Conclusion

No significant difference in Manufacture accuracy and geometric discrepancy of direct laser sintering versus cast 3D printed resin pattern of Co-Cr bars in mandibular implant retained complete overdenture.