Protetik Diş Tedavisi Bölümü Makale Koleksiyonu
https://hdl.handle.net/11655/174
2024-03-28T17:41:37ZDo Resin Cements Alter Action Potentials Of Isolated Rat Sciatic Nerve?
https://hdl.handle.net/11655/19191
Do Resin Cements Alter Action Potentials Of Isolated Rat Sciatic Nerve?
Ertan, Ahmet Atila; Beriat, Nilufer Celebi; Onur, Mehmet Ali; Tan, Gamze; Cehreli, Murat Cavit
Objectives: The purpose of this study was to explore the effects dual-cure resin cements on nerve conduction. Methods: Panavia F, RelyX ARC, and Variolink II polymerized either by light-emitting diode (LED) or quartz tungsten halogen (QTH) were used in the study (n=10). The conductance of sciatic nerves of 50 rats were measured before and after contact with the specimens for 1 h. Results: The time-dependent change in nerve conductance and the comparison of LED versus QTH showed that differences between groups are significant (P<.05). For both polymerization techniques, pair-wise comparisons of resin cements showed that the nerve conductance between groups is different (P<.05). RelyX ARC elicited irreversible inhibition of compound action potentials (more than 50% change) and Panavia F and Variolink II polymerized by LED and QTH did not alter nerve conduction beyond physiologic limits. Conclusions: Resin cements may alter nerve conductance and even lead to neurotoxic effects.
2011-01-01T00:00:00ZDislodgement Resistance Of Zirconia Copings Cemented Onto Zirconia And Titanium Abutments
https://hdl.handle.net/11655/19190
Dislodgement Resistance Of Zirconia Copings Cemented Onto Zirconia And Titanium Abutments
Güler, Umut; Budak, Yasemin; Cavalcanti Queiroz, Jose Renato; Özcan, Mutlu
Purpose: To determine the effect of the cement type and abutment material on the tensile strength required to dislodge zirconia copings. Materials and Methods: Two experimental groups of abutments were prepared: (1) titanium abutments (n = 30) and (2) zirconia abutments (n = 30). Sixty zirconia copings (custom designed) were fabricated using 3-dimensional computer-assisted design to have a 6-mm projection above the abutment to accommodate a hole, through which a wire was inserted to attach the zirconia coping to a universal testing machine. Each abutment was placed onto an implant analog embedded in acrylic resin blocks to fit onto the universal testing machine. The zirconia copings were cemented onto the abutments with a provisional luting agent, zinc phosphate (ZP) cement, and adhesive resin cement, and after 5500 thermocycles, a tensile force was applied at a crosshead speed of 0.5 mm/min. The removal force was recorded for each specimen. Two-way analysis of variance (ANOVA) and 1-way ANOVA were used for the statistical analysis (P < 0.05). Results: The mean forces necessary to remove the zirconia copings from titanium abutments were 6.52, 83.09, and 251.18 N for temporary cement, ZP cement, and resin cement, respectively. For zirconia abutments, the required forces were 17.82, 116.41, and 248.72 N. Conclusions: The abutment material had no effect on retention, but the cement type affected the retention of the zirconia copings.
2017-01-01T00:00:00ZCorrelation Between Microleakage And Screw Loosening At Implant-Abutment Connection
https://hdl.handle.net/11655/19188
Correlation Between Microleakage And Screw Loosening At Implant-Abutment Connection
Sahin, Cem; Ayyildiz, Simel
PURPOSE This study aimed to evaluate the correlation between microleakage and screw loosening at different types of implant-abutment connections and/or geometries measuring the torque values before and after the leakage tests. MATERIALS AND METHODS Three different abutment types (Intenal hex titanium, internal hex zirconium, morse tapered titaniuım) with different geometries were connected to its own implant fixture. All the abutments were tightened with a standard torque value then the composition was connected to the modified fluid filtration system. After the measurements of leakage removal torque values were re-measured. Kruskal-wallis test was performed for non-parametric and one-way ANOVA was performed for parametric data. The correlation was evaluated using Spearman Correlation Test (α=0.05). RESULTS Significantly higher microleakage was found at the connection of implant-internal hex zirconium abutment. Observed mean torque value loss was also significantly higher than other connection geometries. Spearman tests revealed a significant correlation between microleakage and screw loosening. CONCLUSION Microleakage may provoke screw loosening. Removing torque values rationally decrease with the increase of microleakage.
2014-01-01T00:00:00ZCustom-Made Gold Implant For Management Of Lagophthalmos: A Case Report
https://hdl.handle.net/11655/19189
Custom-Made Gold Implant For Management Of Lagophthalmos: A Case Report
Tuna, Suleyman Hakan; Gumus, Hasan Onder; Hersek, Nur
Lagophthalmos is defined as the inability to close the eyelids completely. This situation may lead to corneal problems such as epithelial defects, stromal thinning, exposure keratitis, bacterial infection, perforation, and blindness. A patient with lagophthalmos underwent insertion of a custom-made gold weight implant. After implantation, the patient was able to close her eye and expressed high cosmetic and aesthetic results. Fabrication of gold weight implant by the means of a rolling machine is an effective and easy way and should be considered in the management of lagophthalmos.
2008-01-01T00:00:00Z