FIT ACCURACY ASSESSMENT OF DIGITAL RESTORATIONS FOR PRIMARY TEETH USING THE TRIPLE SCAN METHO

Thoại Kiều Quốc, Tùng Lê Anh, Phú Đào Minh, Khanh Phạm Hoàng Bảo, Tân Thái Trần Minh, Nguyên Trần Chí, Ninh Trương Hải, Hùng Hoàng Trọng, Nam Huỳnh Công Nhật

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Abstract

Introduction: Restoring primary teeth aesthetically and durably is challenging. Traditional methods like stainless steel or prefabricated zirconia crowns have limitations regarding aesthetics, invasiveness, or marginal fit. Digital dental technology (CAD/CAM, 3D printing) offers the potential for more accurate and minimally invasive restorations for children. Objective: This in-vitro study aimed to compare the fit accuracy of three types of digitally fabricated primary incisor crowns: 3D-printed resin, CAD/CAM hybrid ceramic, and CAD/CAM PMMA. Method: Ten samples of each crown type (total of 30) were designed using CAD software based on 3D scan data of a prepared primary incisor abutment. After fabrication, the fit accuracy was quantitatively evaluated using the Triple Scan superimposition method, employing specialized software to compare 3D scans of the abutment, the intaglio surface of the crown, and the seated crown. Deviation data (RMS, mean, minimum, maximum) were statistically analyzed. Results: Results indicated that the 3D-printed resin crowns exhibited significantly lower overall deviation (RMS and mean values), representing better fit compared to the two CAD/CAM crown groups (p<0.05). Specifically, the marginal gap of the 3D-printed crowns was also significantly smaller than that of the hybrid ceramic crowns (p<0.05). No significant difference was observed in the internal fit among the three groups. Conclusion: In conclusion, 3D-printed resin crowns demonstrated better overall and marginal fit under the study conditions compared to CAD/CAM-fabricated hybrid ceramic and PMMA crowns for primary incisor restorations.

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References

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