Raw Data Comparison of Coffee-Induced Discoloration in Milled, 3D-printed, and Conventional Acrylic Teeth
Description
Raw Data of 18 specimens from milled, 3D-printed and conventional acrylic teeth obtained from spectrophotometer and calculated into ∆E00T1, ∆E00 T3, and ∆E00T7.
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Three types of acrylic teeth were obtained from Sainamthip Dental Laboratory Co., Ltd. (FDA Certificate of Medical Device Manufacturing Establishment Registration No. 100/2554, Thailand). The milled acrylic teeth were fabricated from A1-shade SMILE CAM monochromatic PMMA blocks (Lot No. 0114952, Pressing Dental Srl, San Marino). The 3D-printed acrylic teeth were fabricated using N1-shade NextDent C&B MFH resin (Lot No. WN143N03, 3D Systems, Inc., Soesterberg, Netherlands). The conventional acrylic teeth were A1-shade MOULD T3 NEW ACE Two-Layer Acrylic Resin Teeth (Lot No. HL0876, Yamahachi Dental MFG., Co., Aichi, Japan). For the milled and 3D-printed acrylic groups, a conventional acrylic maxillary right central incisor was used as the master model to ensure identical morphology for all groups. The lightest shade available for each acrylic tooth type was selected to facilitate detection of discoloration.[3,13] Each group comprised six specimens (N = 18). The coffee solution was prepared by heating 560 mL of sterile distilled water to 80°C and dissolving 8 g of freeze-dried instant coffee (Nescafé Gold Blend, Lot No. 51924911/2310, Nestlé Japan Co., Shiga, Japan). The solution was stirred for 20 seconds and allowed to cool to 37°C before specimen immersion. The coffee solution was renewed every 24 hours. A custom immersion positioner was fabricated by 3D printing using Model Resin V3 (Lot No. 20260413, Formlabs, Massachusetts, USA) to ensure consistent specimen orientation. The immersion positioner containing all specimens was placed inside a sealed stainless steel canister, which was then submerged in a water bath (Water Bath-WB-2S, SN033020262263, JOANLAB Equipment Co., Ltd., Zhejiang, China) to maintain the solution temperature at 37°C. Before the baseline measurement (T0), all acrylic teeth were immersed in sterile distilled water for 24 hours. The specimens were then immersed in the coffee solution, and color measurements were obtained after 1, 3, and 7 days of immersion (T1, T3, and T7, respectively). Before each color measurement, the specimens were rinsed with sterile distilled water, and excess water was removed using absorbent paper. Color measurements were performed using a VITA Easyshade® V spectrophotometer (SNH62072, VITA Zahnfabrik H. Rauter GmbH, Bad Säckingen, Germany). To ensure consistent placement and orientation of the spectrophotometer tip at the center of the labial surface across all evaluations, a custom measurement jig was fabricated from the same Model Resin V3. The color difference (ΔE00) from baseline at each coffee immersion interval was calculated using the CIEDE2000 formula.