Evaluation of Marginal Fit of Provisional Restoration Fabricated Using Tooth Moulding Acrylic Powder, Bisacryl Composite and 3D Printed Resin: An In-vitro Study

Abstract

Introduction: Provisional restorations should have a good marginal fit with non impinging margins and ease of cleansability to protect the gingiva and periodontal tissues. Impinging margins can result in gingival inflammation, while an improper marginal fit can lead to microleakage, recurrent caries and postoperative sensitivity. Aim: To evaluate and compare the marginal fit of provisional restorative materials made using Dental Products of India (DPI) tooth moulding acrylic powder, Bisacryl composite (Protemp IV) and 3D printed resin. Materials and Methods: In this in-vitro study was conducted at the Department of Prosthodontics, KSR Institute of Dental Science and Research, Tiruchengode, Tamil Nadu, India from October 2023 to February 2024, 42 samples were divided into three groups. Group-A samples were prepared using DPI self-cure tooth moulding powder; Group-B samples were prepared using Protemp IV; and Group-C samples were prepared using 3D printed resin (n=14). The provisional crowns were fabricated using a prepared typodont tooth to evaluate their marginal fit. The marginal fit was assessed using a stereomicroscope. Photographs were taken and the marginal gap was measured using Image J software. The results were then tabulated and statistical analysis was performed. Results: The results of the study showed that the marginal fit was better in 3D printed resin (107.97 μm) compared to DPI tooth moulding acrylic powder (192.56 μm) and Bisacryl composite (Protemp IV) (177.67 μm). Conclusion: The marginal fit of the 3D printed provisional restorative resin was significantly better than that of the provisional restorations fabricated with Protemp IV and the DPI self-cure tooth moulding powder.

Keywords

• marginal adaptation
• polymethacrylate
• stereomicroscope