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Simple occlusal diagnosis and treatment using BDORT
In this study, simple method using by Bi-Digital О-Ring Test (OMURA, Y. 19772022, BDORT) showed to determine the correct occlusal vertical dimension and the treatment. In prosthodontics, the Wills method (measurement the distance from the pupil to the angle of mouth is equal to the distance from the lower nasal point to the chin) reveal to determine a guideline for occlusal vertical dimension, but it is exceedingly difficult to determine the appropriate occlusal vertical dimension in practice. Omura Y., Shimotsuura Y., Fukuoka A., Fukuoka H., Nomoto T. Significant Mercury Deposits in Internal Organs Following the Removal of Dental Amalgam, & Development of Pre-Cancer on the Gingiva and the Sides of the Tongue and Their Represented Organs as a Result of Inadvertent Exposure to Strong Curing Light (Used to Solidify Synthetic Dental Filling Material) & Effective Treatment: A Clinical Case Report, along with Organ Representation Areas for Each Tooth.
Journal Article
Implantatprothetik
Dieses umfassende, systematische Lehr- und Handbuch für die implantatprothetische Versorgung wurde für die zweite Auflage vollständig überarbeitet und um digitale Workflows, vollkeramische Materialien, Konzepte für die hochästhetische Zone sowie um klare Handlungsempfehlungen bei Patientinnen und Patienten unter antiresorptiver Therapie ergänzt. Ebenfalls neu besprochen werden die Sofortversorgung des zahnlosen Kiefers, wirksame Behandlungsstrategien zur Periimplantitistherapie und langfristige Zahlen zu Erfolgsraten.Illustriert mit über 3.000 Abbildungen und einer Vielzahl von Entscheidungsbäumen stellt es ein schlüssiges, evidenzbasiertes Konzept zur prothetisch orientierten Implantation und individuellen Versorgung vor – durchdacht von der ersten Planung bis zur Nachsorge und mit dem patientenindividuellen prothetischen Behandlungsoptimum im Mittelpunkt. Die entscheidenden Schnittstellen zwischen Implantologie und Prothetik, Prothetik und Zahntechnik sowie zwischen Patientin/Patient und Behandlungsteam werden detailliert erläutert.
eBook
Effect of Different Surface Treatment on Hardness of Dental Alloys
Objectives: Investigate different surface treatments on hardness of specimens produced by CAD-CAM milling techniques and selective laser melting technique. Materials and Methods: Thirty disc-shaped specimens were put into three main groups. Each group has ten examples of Co-Cr metal that were made of different materials. There were three kinds of milling: hard, selective laser melting (3D printer), and soft. Everything was cut up into 15 mm wide pieces that were 3 mm thick so that they could be used for more tests. The last step was to finish them off and make their surfaces smooth with a diamond grinder. A scanning electron microscope (SEM) was used to look at one example from each group and figure out how the surface of the metal frame was made. We tested how hard specimens were. We used the independent sample one-way ANOVA to determine differences. Results: Hardness tests for all test groups in the study showed that 3D printing usually gave the best hardness in the control and sandblast groups. Hard cutting gave the most hardness in the Laser group. We used One- and Two-way ANOVA and Levene's test to look at the data statistically. All the tests had p-values of 0.001, which means that the hardness values for each milling type are very different from one another. Conclusion: 3D printing generally resulted in the highest hardness values, and the control and sandblast groups hard milling showed superior hardness in the Laser group.
Journal Article
Acrylic Denture Basis’ Long-Term Colour Stability
Objective: This study investigated how staining solutions affected the acrylic denture bases' colour stability. Materials and Methods: Fifty-six samples of acrylic denture base (hot and cold) were submerged in distilled water for control and three staining solutions. A spectrophotometer was utilized to measure colour Before immersion, every sample's initial colour value was noted. Following a 24-hour, one-week, and two-week immersion period, colour change values were calculated. Results: Hot coffee was the most preferred beverage, showing strong significance over both time periods (P = 0.002 for 24 hours, P = 0.013 for 1 week). This indicates a consistent preference for hot coffee. Karak and hibiscus demonstrated increasing preference over time, especially in their hot forms (P = 0.001 for hot Karak, P = 0.006 for hot hibiscus). This suggests that these drinks become more favored as habits develop. Comparison between 24-hour and 1-week data showed that coffee remained stable in preference, while Karak and hibiscus became more preferred over time. Conclusion: The denture base's discoloration rose in direct proportion to the immersion time, and the instant coffee solution was discovered to be the most chromogenic staining solution. To maintain the color stability of acrylic dentures, users should adopt good oral hygiene practices and minimize prolonged exposure to these beverages.
Journal Article
3D Printed Co-Cr Alloy Surface Treatments Effect on Shear Strength of Heat Cured Resins
Objective: To investigate the effect of different surface treatments—hydrochloric acid etching, sandblasting, metal primer application, and a combination of sandblasting with metal primer on the shear bond strength (SBS) of heat-cured polymethyl methacrylate (PMMA) bonded to 3D-printed Co-Cr alloy, and to assess the failure modes. Materials and Methods: Fifty disk-shaped 3D-printed Co-Cr specimens were divided into five groups (n=10 each): control (C), acid etch (A), sandblast (S), metal primer (P), and sandblast + primer (SP). Specimens were bonded to heat-cured PMMA resin and tested for shear bond strength using a universal testing machine. Failure modes were examined microscopically. Data were analyzed using one-way ANOVA and Duncan’s multiple range test. Results: Significant differences in SBS were observed among groups (p ≤ 0.05). The SP group showed the highest SBS (15.78 ± 1.19 MPa), followed by P (12.77 ± 2.61 MPa) and S (5.80 ± 1.01 MPa). The A (0.43 ± 0.08 MPa) and C (0.37 ± 0.07 MPa) groups exhibited the lowest SBS values. Failure mode analysis revealed adhesive failures in C, A, and S groups, while P and SP showed predominantly mixed failures. Sandblasting increased surface roughness, while primers enhanced chemical bonding without altering topography. Conclusions: The combination of sandblasting and metal primer achieved the highest bond strength, confirming a synergistic effect between micromechanical and chemical bonding. Acid etching alone was ineffective. Combined treatments are recommended to improve the clinical performance of 3D-printed Co-Cr RPD frameworks.
Journal Article
Analyzing the Effects of Polident and Thyme Extract Oil on Denture Base
Objective: Dentures are the most common remedy for edentulous human population. Natural products and essential oils provide promising therapeutic agents for the treatment of oral infections. The increasing understanding of the diverse applications of natural resources has made them a favored substitute for manufactured materials. therefore, the goal of this study was to find out how different immersion solutions [thyme oil, Polident denture clean] changed the roughness, hardness, and transverse strength of 3D-printed PMMA denture base. Materials and Methods: The current study produced ninety 3D-printed resin samples, each measuring [65mm ×10mm×2.5mm] and classified them into three groups including 30 samples, each group were submerged into three groups depending on immersion solutions [control, thyme essential oil, and Polident denture cleaner] for a duration of 15 days. After that the samples were tested for surface roughness, hardness, and transverse strength. Results: The Polident immersion group had the highest surface roughness values followed by thyme essential oil, whereas the control group was demonstrated the lowest mean values. Likewise, the surface hardness test findings demonstrated that the Polident immersion group exhibited the greatest mean values, while the thyme immersion group had the lowest mean values but statistically was not significant. Furthermore, the transverse strength test indicated the lowest average transverse strength for the thyme essential oil group. Conclusion: Thyme essential oil as a denture cleaner better preserves surface roughness but has a lesser influence on the hardness and transverse strength of the 3D Print denture base compared to Polident denture cleanser.
Journal Article