ASSESSMENT OF THE MILLING TRUENESS AND PRECISION OF TWO DIFFERENT IMPLANT-SUPPORTED BAR MATERIALS BY 3D OPTICAL SCANNING. | ||
| Alexandria Dental Journal | ||
| Articles in Press, Accepted Manuscript, Available Online from 06 October 2025 PDF (714.59 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/adjalexu.2025.365581.1604 | ||
| Authors | ||
| nourhan Emam* 1; Nayrouz Metwally2; Mohamed Moataz Khamis3 | ||
| 1Assistant lecturer Department of prosthodontics, Faculty of Dentistry, El-Zagazig University, Egypt. PhD researcher, Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Egypt. | ||
| 2Associate professor of Prosthodontics, Department of Prosthodontics Faculty of Dentistry - Alexandria University, Bab Sharqi, Alexandria Governorate, Egypt. | ||
| 3Professor and Chairman, Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Bab Sharqi, Alexandria Governorate, Egypt. | ||
| Abstract | ||
| Objective: Milling trueness is a critical factor in digital dentistry, influencing the precision and fit of milled restorations. This paper reviews the concept of milling trueness, factors affecting its accuracy, and its clinical implications. Studies indicate that material properties, milling strategies, tool wear, and machine calibration significantly impact the final restoration’s dimensional accuracy. Advances in CAD/CAM technology and improved milling protocols contribute to enhanced trueness, ensuring better clinical outcomes. Methods: Milling trueness was measured by the 3D optical scan and superimposition method. A deviation assessment was made between the intraoral scan's STL files and the reference virtual design STL file to assess the milling trueness, all STL files were imported into a surface-matching software program (Medit Design v3.0.6 Build 286; Medit Corp) where RMS (root mean square) deviations in (μm) were calculated. Results: Titanium bar was significantly more true when compared to the PEEK bar. However, there was no significant difference in the precision of both groups. Conclusion: Milling trueness is a fundamental aspect of digital dentistry, directly influencing restoration accuracy and clinical performance. The titanium bar exhibited significantly greater trueness compared to the PEEK bar, due to its rigidity and reduced milling distortions indicating superior accuracy in milling. PEEK, being a polymer-based material, may exhibit increased deviations due to its lower stiffness and the potential for minor elastic deformation under milling forces. However, both materials demonstrated comparable precision. Running title: Milling Trueness and Precision Titanium vs. PEEK in Implant-Supported Bars Keywords: Titanium bar, PEEK bar, milling trueness, Deviation. | ||
| Keywords | ||
| Titanium bar; PEEK bar; milling trueness; Deviation | ||
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