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Volume 8 Issue 6 (June, 2020)

Original Articles

Evaluation of microleakage of metallic copings cemented with three luting agents
Humaira Mushtaq

Background: The ultimate goal of any prosthetic treatment is providing the patient with a precisely fabricated restoration which preserves the long term integrity of natural abutments of fixed partial dentures and their pulpal vitality. Zinc phosphate cement is one of the most popular cements, which has been in use for many years. The success of this material has been attributed to high retentive and fatigue strength as well as its minimal film thickness of <25 μ. Polycarboxylate cement and glass ionomer cement have attracted attention due to their ability to bond chemically with various restorative materials and to tooth structure. Aim of the study: To evaluate microleakage of metallic copings cemented with three luting agents. Materials and methods: The present study was conducted in the Department of Prosthodontics of the institute of dental studies and technologies dental institution (IDST). The ethical clearance for the study was approved from the ethical committee of the hospital. For the study, we selected a total of 50 mandibular prepared molars. An assembly with the airotor mounted on the dental model surveyor was used to achieve a uniform taper of six degrees. The prepared teeth were cleaned with pumice and water.The cemented specimens were thermocycled after 24 hours between 5°C and 50°C. After thermocycling, the teeth were treated with 50% silver nitrate solution for 60 minutes and placed under a 150 watt flood lamp for five minutes to allow proper fixation of any unfixed stain.Results: In the present study, a total of 50 mandibular molars were prepared to evaluate microleakage of three cements, glass ionomer cement, resin modified glass ionomer cement and resin cement. Table 1 showed mean microleakage with different cements. It was observed that highest microleakage was seen with resin cement.Conclusion:Within the limitations of the present study, it can be concluded that marginal microleakage is seen in all the cements. GIC provides maximum efficiency and has minimal microleakage as compared to resin modified GIC and resin cements. Keywords: Microleakage, marginal microleakage, glass ionomer cement, resin cement

 
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