Effect of Building Orientation on Marginal Gap and Internal Fit of The Implant-Supported 3D-Printed Provisional Crown
Keywords:
implant, provisional restoration, 3D printing, marginal gapAbstract
Background: With the increasing popularity of immediate implant placement and restoration, precise fabrication methods for provisional restorations have become crucial since it helps preserving the soft tissue around the implant. 3D-printed PMMA provides cost-effective alternatives despite concerns about polymerization shrinkage. Previous studies have shown that building orientation for 3D-printed methods can affect the marginal gap and internal fit of the restoration. This study aims to examine the effect of building orientation on the marginal gap and internal fit of implant-supported provisional prostheses. Materials and Methods: The implant-supported provisional restoration of the right maxillary central incisor was designed by complete digital workflow using 3shape software. The virtual implant crowns were fabricated with 3D-printer (DLP technology) in three different building orientations (0°, 45°, and 90°) with 10 samples per group. The samples underwent post-processing methods according to the manufacturer’s recommendation. Marginal gap and internal fit examination were conducted using a digital silicone replica technique and superimposition method. After digitizing the silicone replica into .stl file, the gap distances were measured at sixteen reference points for each sample using Artec Studio 18 software. The degree of discrepancy was reported in color mapping. The measurements were statistically analyzed using One-way ANOVA . Results: Statistical analysis revealed significant differences in marginal, cervical, and axial gap across the three groups (p < 0.05) except the occlusal gap. The 45° group had a significantly smaller marginal gap (19.1 ± 6.98 μm) than the 0° group (29.78 ± 10.63 μm) and the 90° group (35.68 ± 18.37 μm). Color mapping indicated thicker cement space around the margin of the Ti-base abutment in the 0° and 90° groups compared to the 45° group. Conclusion: Building orientation in 3D printing significantly affects the marginal gap and internal fit of implant-supported provisional restorations. The 45° orientation produced the best results among the three groups.Downloads
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เจ้าของบทความต้องมอบลิขสิทธิ์ในการตีพิมพ์แก่วิทยาสาร โดยเขียนเป็นลายลักษณ์อักษรแนบมาพร้อมบทความที่ส่งมาตีพิมพ์ ตามแบบฟอร์ม "The cover letter format" รวมทั้งต้องมีลายมือชื่อของผู้เขียนทุกท่านรับรองว่าบทความดังกล่าวส่งมาตีพิมพ์ที่วิทยาสารนี้แห่งเดียวเท่านั้น
