Premium
Translucency parameter and color masking ability of CAD‐CAM denture base materials against metal substrates
Author(s) -
Wang YunJu,
Chu TienMin G.,
Lin WeiShao
Publication year - 2023
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.13581
Subject(s) - materials science , color difference , acrylic resin , masking (illustration) , composite material , dentistry , medicine , computer science , coating , art , visual arts , filter (signal processing) , computer vision
Purpose To investigate the translucency parameters of traditional, milled, and 3D‐printed denture base materials at 3 different thicknesses and the color masking ability of each material against a metallic background between different thicknesses. Material and methods A traditional heat‐polymerizing polymethylmethacrylate (PMMA) (H‐Lucitone) material was used as the control group. Two milled pre‐polymerized resin blocks (M‐Lucitone and IvoBase) and five 3D‐printed denture base materials (P‐Lucitone, Dentca LP, Dentca OP, Formlabs, and Kulzer) were used as experimental groups. A total of 240 samples, (n = 30, per material) were fabricated to a final specimen dimension of 12×12 mm and in thicknesses of 1.0, 2.0, and 3.0 mm (n = 10 per thickness/material) according to the manufacturers’ recommendations. The color coordinates (L*, a*, b*) in CIELab color space for all specimens placed against a white, black, and metallic background were measured with a spectrophotometer. The translucency parameters (TP 00 ) at each thickness and the color differences between 1 mm and 2 mm (dE 00M1‐2 ) and between 2 mm and 3 mm (dE 00M2‐3 ) against the metallic background were calculated with the CIEDE2000 color matrix. Comparisons between the groups for differences in TP 00 were made using One‐way ANOVA separately for each thickness. Comparisons of groups and materials for differences in dE 00M1‐2 and dE 00M2‐3 were made using Two‐way ANOVA and Fisher's Protected Least Significant Differences (α = 0.05). Results The TP 00 decreased with increasing thickness in all 8 material groups. All 3D‐printed materials, except P‐Lucitone, had higher TP 00 than milled pre‐polymerized resin materials (M‐Lucitone and IvoBase), and traditional heat‐polymerizing PMMA (H‐Lucitone) material ( P <.001) at all thicknesses. In the 1 mm and 2 mm thickness, heat‐polymerizing acrylic resin (H‐Lucitone) had the lowest TP 00 , and in the 3 mm thickness, milled acrylic resin (M‐Lucitone and IVOBase) had had lowest TP 00 ( p < 0.001). All material groups had significantly lower values of dE 00M2‐3 than dE 00M1‐2 ( p < 0.001). The color differences dE 00M2‐3 were significantly lower in H‐Lucitone, M‐Lucitone, P‐Lucitone, and IvoBase groups than in other materials, while the color difference of dE 00M1‐2 was significantly lower in H‐Lucitone, P‐Lucitone and Dentca LP than other materials ( p < 0.001). Conclusions The results from this study provide clinicians and dental technicians with information regarding the selection of denture base materials to achieve desired color masking outcomes, according to available prosthetic space. Thicker prostheses significantly improved the color masking abilities of denture acrylic resins against a metallic background. In a thickness of 1 and 2 mm, the heat‐polymerizing acrylic resin had a lower translucency parameter and better color masking ability. When the prosthesis thickness reached 3 mm, the milled acrylic resin had a lower translucency parameter and better color masking ability. When compared to the heat‐polymerizing resin and milled acrylic resin materials, except for one 3D‐printing resin (P‐Lucitone), the color masking abilities of the remaining 3D‐printing resin materials were low, regardless of prosthesis thickness.