Department of Prosthodontics and Crown and Bridge, Bharati Vidyapeeth Deemed University Dental College and Hospital, Pune, Maharashtra, India, Phone: +91 9890876681, e-mail:
Department of Prosthodontics and Crown and Bridge, Bharati Vidyapeeth Deemed University Dental College and Hospital, Pune, Maharashtra, India.
J Contemp Dent Pract. 2022 Oct 1;23(10):991-997. doi: 10.5005/jp-journals-10024-3399.
This study was conducted to comparatively assess the retention and vertical marginal fit of cobalt-chromium copings fabricated by the conventional casting technique, 3D-printed resin pattern, and with direct metal laser sintering (DMLS) technique.
Out of the total 60 test samples, 20 copings were obtained from inlay-casting wax and 20 from casting of 3D-printed resin patterns. In total, 20 copings were obtained from the laser sintering technique. All 60 test samples were then cemented serially on the prepared maxillary-extracted premolars and were evaluated for vertical marginal gap in 8 pre-established reference areas. Retention was evaluated using a universal testing machine.
Results obtained for both marginal gap and retention were statistically analyzed, and the values fall within the clinically acceptable range. The DMLS technique proved precedence over the other two techniques used, as it exhibited maximum retention and marginal accuracy, which is an area of prime concern.
The results from this study encourage further research with different pattern-forming materials and techniques and the need to identify the factors that facilitate better marginal fit and retention of cast restorations.
This study has myriad of applications in clinical dentistry mainly in decision-making for casting procedure to provide better retention and marginal accuracy for fabrication of Co-Cr crowns. It also aims to aid the clinician to minimize errors by using different techniques for fabrication of wax pattern as well as the coping, keeping abreast with the recent technology to evaluate the accuracy of 3D-printed resin pattern over conventional wax pattern.
本研究旨在比较评估传统铸造技术、3D 打印树脂模型和直接金属激光烧结（DMLS）技术制作的钴铬金属冠的保留力和垂直边缘适合性。
在总共 60 个测试样本中，有 20 个冠从镶嵌铸造蜡中获得，20 个从 3D 打印树脂模型铸造获得。总共有 20 个冠是从激光烧结技术获得的。然后将所有 60 个测试样本连续粘接到准备好的上颌磨牙上，并在 8 个预先设定的参考区域评估垂直边缘间隙。使用万能试验机评估保留力。
对边缘间隙和保留力的结果进行了统计分析，结果均在临床可接受范围内。DMLS 技术优于其他两种使用的技术，因为它表现出最大的保留力和边缘精度，这是一个主要关注的领域。
本研究结果鼓励进一步研究不同的成型材料和技术，并需要确定有助于改善铸造修复体边缘适合性和保留力的因素。
本研究在临床牙科中有广泛的应用，主要用于铸造程序的决策，以提供更好的保留力和边缘精度，用于制作 Co-Cr 冠。它还旨在通过使用不同的技术来制造蜡型以及冠，帮助临床医生最小化错误，紧跟最近的技术，以评估 3D 打印树脂模型相对于传统蜡型的准确性，从而帮助临床医生最小化错误。
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