Saudi Cultural Missions Theses & Dissertations
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Item Restricted Bond Strength of Denture Teeth to Conventional, Milled and 3D-Printed Denture Bases(Saudi Digital Library, 2025) Abumansour, Malik; Ontiveros, Joe C; Gonzalez, Maria D; Belles, Donald M; amnuay, Sudarat Kiat; amnua, Chun-YenOBJECTIVE: This in vitro study assessed the shear bond strength and failure modes between denture teeth and denture bases fabricated using conventional, two-part milled, monolithic milled, or 3D-printed complete denture techniques. MATERIALS AND METHODS:A total of 40 denture base substrates (30 mm diameter x 10 mm height) were processed according to the following material treatment groups, n=10 for all groups: (1) Conventional complete denture processed using heat-polymerized resin (Lucitone 199, Dentsply Sirona) as a control; (2) 3D-printed denture resins (Lucitone Digital IPN 3D Premium, shade A1, and Lucitone Digital Print 3D Denture Resin, Original); (3) Two-part milled dentures from pre-polymerized polymethylmethacrylate pucks (Lucitone Digital Fit Denture Base Disc, Dentsply Sirona; Multilayer PMMA Discs, Dentsply Sirona), and (4) Monolithic milling denture (AvaDent, Extreme cross-linked PMMA). For all groups, prefabricated denture teeth or bases were embedded in autopolymerizing acrylic resin, except for Group four, in which the base and teeth were fabricated as a single unit. After embedding, specimens were polished using 400-grit sandpaper to achieve uniform surface exposure. The bonding of the two parts, base and teeth, was performed according to each manufacturer’s protocol. All specimens were tested within 24 hours of bonding. Shear bond strength was measured using a universal testing machine at a crosshead speed of 1 mm/min. The mode of failure was observed and recorded. Data were analyzed using one-way ANOVA followed by Tukey post hoc test at a significance level of α = 0.05. RESULTS: The monolithic milling group demonstrated the highest bond strength among all groups, with statistically significant differences compared to the others (p < 0.01), with 100% cohesive failure. The 3D printed group exhibited a significantly higher mean bond strength than both the conventional and milled groups (p = 0.001), with 70% of mixed failure. There was no significant difference between the conventional and milled groups (p = 0.98), which represent 90% and 100% of adhesive failure, respectively. CONCLUSIONS: Among all groups, the monolithic milled dentures (AvaDent) demonstrated the highest bond strength at the base-to-tooth interface. The 3D-printed denture specimens showed greater base-to-tooth bond strengths compared to both the conventionally processed and the two-part milled dentures, which showed no significant difference from each other.18 0Item Restricted Shear Bond Strength of Glass Ionomer Cement after Silver Diamine Fluoride Application to Primary Molars: In-Vitro Study.(Tufts University, 2024-06-01) Alabdulmohsen, Amjad; Loo, Cheen; Pagni, Sarah; Swee, Gerald; Uzel, GuzinAim: The aim of this in vitro study was to investigate and compare shear bond strength of Glass Ionomer cement to carious dentin of primary molars after the application of three different types of Silver Diamine Fluoride therapy: Silver Diamine Fluoride 38% (SDF), Silver Diamine Fluoride 38% with Potassium Iodide (SDF/KI), and Silver Fluoride Aqua with Iodide (AgF/KI). Materials and Methods: Extracted carious teeth were collected from Tufts University School of dental medicine. Sample size calculation was based on the pilot study results, total of 40 teeth were included and randomized into four groups (N= 10). Teeth were mounted and cut using Isomat saw, carious part of the tooth was exposed for the experiment. Control group: teeth received glass ionomer restoration. First test group received Silver Diamine Fluoride 38% (SDF), second test group received Silver Diamine Fluoride 38% with Potassium Iodide (SDF/KI), third test group received Silver Fluoride Aqua with Iodide (AgF/KI). Three test groups then received glass ionomer restoration and all four groups were tested for shear bond strength using Instron Machine. Mean and standard deviation were calculated, Welch’s ANOVA and the Games-Howell test for pairwise comparisons were used. Results: Comparison between control group of glass ionomer restoration used directly on dentin and all test groups of SDF therapy shows that shear bond strength is decreased when caries arresting medicaments used, regardless of the type. This reduction is statically significant. Conclusion: Within the limitation of this laboratory study, it can be concluded that SDF application in all three forms reduced shear bond strength of glass ionomer cements to extracted primary molars with natural caries.28 0Item Restricted Evaluation of Shear Bond Strength of Zirconia to Resin Cement After Surface Treatment with Different Air Abrasion Zirconia Particles(University at Buffalo, The State University of New York, 2024-05) AlMozayen, Ahmed; Kim, Hyeongil; Keblawi, Dana; Makowka, StevenThe aim of the study: This in vitro study aims to assess the shear bond strength of different zirconia generations 3Y-TZP, 4Y-PSZ, and 5Y-PSZ and resin cement after surface modification using different abrasive particles, zirconia (beads and sharp edge particles) and aluminum oxide sharp edge in comparison to control (no surface treatment). Material and methods: Ninety zirconia discs (W 19.42x H 2.04), comprising 30 each of 3% Y-TZP, 4% Y-PSZ, and 5% Y-PSZ, were provided by Dentium ( Rainbow™). The specimens were lapped and polished with 6-micron diamond slurry and 3-micron diamond slurry, respectively. Surface treatments included 50-micron aluminum oxide abrasive particles, 50-micron zirconia abrasive bead particles, 50-micron zirconia abrasive sharp edges particles, and a control group (no surface treatment). After surface treatment, bonding was conducted using SpeedCEM Plus self-adhesive dual cure resin cement (Ivoclar Vivadent Inc.), and shear bond strength was assessed by a universal testing machine ( Instron LLC.), following ISO standards (ISO 29022). Failure analysis was performed to classify failure types. Statistical analyses were conducted to evaluate the data. A one-way ANOVA, followed by Dunnett's multiple comparisons test, assessed differences in shear bond strength between the control group and various zirconia generation and different surface treatment groups. Furthermore, a Two-way ANOVA, followed by Tukey's multiple comparisons test, examined effect of different surface treatment and material generation to the shear bond strength. Statistical significance was set at α = 0.05 for all analyses. Result: A significant increase in shear bond strength in all surface treatment groups compared to control. Aluminum oxide abrasive particle surface treatment groups demonstrated significantly higher bond strengths compared to zirconia abrasive particle surface treatment groups. There was no statistically significant improvement in the bond strength with different geometry of zirconia abrasive particles. Additionally, zirconia generation influenced bond strength, with higher values vi observed in 5Y-PSZ compared to 4Y-PSZ in the zirconia abrasive particles surface treatment group. However, there was no statistically significant Aluminum oxide abrasive particle regardless of zirconia generation. Failure analysis revealed aluminum oxide abrasives groups demonstrated 50% adhesive failure and 50% mixed failure. The zirconia abrasive bead particle groups had 63.3% adhesive failure and 38.3% mixed failure. The group that received the zirconia abrasive sharp edges particles groups 53.3% adhesive failure and 46.6% mixed failure. SEM confirms residual particles on zirconia surfaces treated with zirconia abrasives and significant roughness with aluminum oxide abrasives. Conclusion: Micromechanical surface treatment with aluminum oxide abrasive particles significantly improves bond strength compared to zirconia abrasive particles. Furthermore, regardless of the shape of zirconia abrasive particles, there was no statistically significant improvement in bond strength. Notably, all zirconia generations responded similarly to surface treatment with aluminum oxide abrasive particles; however, 4Y-PSZ exhibits weakened bond strength with zirconia abrasive particles.23 0