Purpose:To evaluate the combined effect of mechanical surface treatment with intermediate bonding agents (methyl methacrylate [MMA] and silane coupling agents) and ZrO 2 nanoparticle (nano-ZrO 2 ) addition to repair material on the shear bond strength (SBS) of repaired denture bases. Materials and Methods: Heat-polymerized acrylic resin was used to fabricate 130 cylindrical blocks (15 mm × 10 mm) and divided into a control group without treatment (C, n = 10), and 3 repair groups (n = 40/group) divided into specimens treated with alumina blasting alone (AB), specimens blasted with alumina combined with silane coupling agent (AB + SCA), or combined with MMA-based composite bonding agent (AB + MA). Treated groups were further subdivided according to nano-ZrO 2 concentrations into 0 wt%, 2.5 wt%, 5 wt%, and 7.5 wt% added to repair resin powder. Repair resin monomer and polymer were combined and packed on the repair area and then placed in a pressure pot at 37°C for 15 minutes for polymerization. Shear bond test was performed using a universal testing machine. Scanning electron microscopy (SEM) was used to examine the effect of surface modifications on repair surfaces and to evaluate the topography of fracture surfaces. Tukey-Kramer multiplecomparison test was used to detect significant differences between groups (p ࣘ 0.05). Results: SBS (MPa) of specimens treated with alumina blasting and application of intermediate agents were significantly higher than the control group (p < 0.05), while no significant differences were found between AB and control group (p > 0.05). Nano-ZrO 2 addition significantly increased SBS except for AB, and 5%, 7.5% MA (p > 0.05). SEM evaluation showed that alumina blasting created rougher and more porous surfaces, while SCA and MA reduced the irregularities and fissures. Conclusion: Application of bonding agents to repair surfaces after alumina blasting improved the repair bond strength and proved to be a possible new adhesive method for denture repair. Moreover, nano-ZrO 2 addition in combination with surface treatment improved the repair bond strength.

Purpose: The purpose of this study was to evaluate the flexural strength of the acrylic denture base material modified with different concentrations of henna. Materials and Methods: Sixty heat polymerized acrylic resin specimens were fabricated in dimensions 65×10×2.5 mm according to ADA specifications #12. Specimens were divided according to henna concentrations into 6 groups. One control group without henna addition while the other five groups were processed by adding henna in concentrations 1%, 2.5%, 5%, 7.5% and 10% of acrylic powder. After processing, specimens were finished, polished, and stored in distilled water at 37 o C for 48±2 hours prior to testing. The three-point bending test was used to measure the flexural strength using universal testing machine. The morphology of the fractured specimens was studied under a scanning electron microscopy (SEM). The independent sample t-test was used and p≤ 0.05 was considered statistically significant. Results: The flexural strength significantly decreased with henna addition to PMMA denture base material (P<0.05), and this decrease was in proportional to henna concentrations. Conclusion: The flexural strength of acrylic denture base material negatively was affected by henna addition.

Objective: This study was conducted to evaluate oral health-related quality of life with different obturator materials in hemimaxillectomy patients.Patients and Methods: Fourteen hemimaxillectomy patients were received a conventional obturator with combined metallic and heat cured acrylic resin. (Vertex™ Regular, Vertex-Dental B.V. Netherlands (Group I). Then the Patients received obturator constructed from a thermoplastic denture base . (Vertex™ Thermo Sens, Vertex-Dental B.V. Netherlands) (Group II). Oral healthrelated quality of life was measured after six months of obturator use using Functional Obturator Scale scores. Statistics were done using paired t-test to compare the oral health impact profile scale for edentulous patients in both groups.Results: The mean total Functional Obturator Scale score [FOS] for group I and group II were 34.55 and 30.48 respectively. There was a a statistical significant different between both groups in relation to the mean total Functional Obturator Scale Score (P<.05). Conclusions:It was concluded that after six months of obturator use in hemimaxillectomy patients, using a thermoplastic obturator resulted in a better oral health related quality of life than a conventional one. Therefore, it should be considered a treatment plan option to improve oral healthrelated quality of life.

Background: Glioma is one of the most common intracranial tumors, the treatment for which is surgical resection. Cerebral gliomas in eloquent brain areas are closely associated with important structures. The deep location of such gliomas renders complete resection difficult overlaying structures can be injured, causing hemiplegia, aphasia, coma, and other severe complications. The degree of resection directly influences the prognosis of patients. The application of neuronavigation enables the accurate localization of lesions during surgery, significantly improving microneurosurgery. The accuracy of navigation, however, has typically been compromised by several factors, including operation error, shifting of registration system, and intraoperative brain tissue deformation (brain shift). Aim of Study: The aim of the study is to evaluate and demonstrate the efficacy of neuronavigation in the management of brain gliomas. Patients and Methods: This is a prospective randomized clinical trial study included 35 patients with brain glioma were operated for excision or biopsy taken. Results: Localization of burr hole and craniotomy flap was excellent in 33 patients (94.2%) and fault in 2 cases (5.7%), 29 patients (82.8%) had near total excision of the lesions, and 6 patients (17.1%) had burr hole biopsy, intra operative course was smooth in 33 patients (94.2%) with no intra operative complications, 2 cases (5.7%) developed intra operative bleeding that was due to liver problems. Reading the post operative imaging shows that 27 patients (77.1%) had mild to moderate post operative edema around the site of the lesion, the other eight cases were free of hemorrhage, infarction or edema. Conclusion: We found that neuronavigation is very helpful in our cases in localization of the lesions, decreasing time of surgery, reducing morbidity and mortality and decreasing hospital stay. There are concerns about navigation systems including time consuming, calculation and registration, restriction of space and view inside the operating field, and so on, we didn't find these issues as obstacles in our work, but we found that there are many advantages that can be helpful in the process of operation.

Purpose: The current study was conducted to determine the effect of hybrid reinforcement with zirconium oxide nanoparticles (NZ) and glass fibers (GF) on the tensile strength of denture base resin. Materials and methods: Different ratios of NZ/ GF were added into resin at a fixed concentration of 5% by weight. For each formulation (one control and 7 experimental groups), ten specimens were prepared in a dumbbell shape using a stainless steel mold. Tensile strength was evaluated by using a universal testing machine. Scanning electron microscope (SEM) was used to study the fractured surfaces. Results: Tensile strength of the specimens reinforced with NZ/GF in varying ratios was found to be higher than that of the control group. Among the hybrid groups, the specimens reinforced with 50%NZ-50%GF showed the highest tensile strength. SEM fractographs showed multiple lamellae displayed surface, which is characteristic of strong material. Weak adhesion and pull out of fibers from the matrix were seen in high concentration GF. Conclusion: The incorporation of 50%NZ-50%GF into acrylic denture base appeared to improve the tensile strength.