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. 2022 Nov;13(Suppl 1):S238-S242.
doi: 10.4103/japtr.japtr_210_22. Epub 2022 Nov 30.

Comparison of the marginal accuracy of metal copings fabricated by 3D-printed resin and milled polymethyl methacrylate - An in vitro study

Ojasvini Arora  1 , Nabeel Ahmed  1 , Subhabrata Maiti  1
Affiliations

Comparison of the marginal accuracy of metal copings fabricated by 3D-printed resin and milled polymethyl methacrylate - An in vitro study

Ojasvini Arora et al. J Adv Pharm Technol Res. 2022 Nov.

Abstract

Computer-aided design/computer-aided manufacturing (CAD/CAM) systems have gained popularity over the traditional laboratory procedures in dentistry. In the conventional metal casting technique by burnout of a pattern, instead of using a wax pattern (which has several disadvantages), milled polymethyl methacrylate (PMMA) and 3D-printed resin patterns can also be used. The objective of the study was to assess and compare the marginal accuracy of single-crown cobalt-chromium (Co-Cr) metal copings fabricated using milled PMMA and 3D-printed resin patterns. Digital designing was done for metal coping on a prepared typodont mandibular molar using 3Shape Dental Design software. Standard Tessellation Language document of CAD design was used to fabricate 3D-printed resin patterns (Sprintray 3D printer) and milled PMMA patterns (CAD/CAM milling machine CoriTEC). A total of ten Co-Cr copings were casted, of which five belonged to Group A: 3D-printed resin and the other five to Group B: milled PMMA. The copings were assessed for marginal fit at eight different points using a stereomicroscope. Statistical analysis was done using an independent t-test. The t-test revealed a significant difference between the mean marginal gap values of the two groups, with the marginal gap values for the 3D-printed resin group (82.21 ± 15.26 μm) being lesser than that of the milled PMMA group (106.75 ± 12.76 μm). The marginal accuracy of copings fabricated using 3D-printed resin patterns was superior to that of copings fabricated from milled PMMA patterns.

Keywords: 3D printing resin; innovation; marginal accuracy; milled PMMA; polymethyl methacrylate.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
CAD design of the coping. CAD: Computer-aided design
Figure 2
Figure 2
STL file of the coping. STL: Standard Tessellation Language
Figure 3
Figure 3
Metal coping on typodont tooth focused under stereomicroscope
Figure 4
Figure 4
Marginal discrepancy shown by stereomicroscope
Figure 5
Figure 5
Bar graph showing mean marginal gap values for 3D-printed resin and milled PMMA groups. PMMA: Polymethyl methacrylate
See this image and copyright information in PMC

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