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Coronal Microleakage of Teeth Restored With Cast Posts and Cores Cemented With Four Different Luting Agents After Thermocycling Publisher Pubmed



Mohajerfar M1 ; Nadizadeh K2 ; Hooshmand T3 ; Beyabanaki E1 ; Neshandar Asli H4 ; Sabour S5
Authors
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Authors Affiliations
  1. 1. Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  2. 2. General Dentist, Tehran, Iran
  3. 3. Department of Dental Biomaterials, School of Dentistry/Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Dental Sciences Research Center, Prosthodontics Department, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
  5. 5. Department of Clinical Epidemiology, Safety Promotion and Injury Prevention Research Centre, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Source: Journal of Prosthodontics Published:2019


Abstract

Purpose: The apical seal provided by a root canal filling may be breached via coronal leakage. This study aimed to compare the teeth restored with custom-made cast metal posts and cores cemented with different luting agents in terms of coronal microleakage after thermocycling. Materials and Methods: This in vitro study was conducted on 32 extracted single-canal teeth. Root canals were prepared by step-back technique and filled with gutta percha and sealer. The coronal 7 mm of gutta percha was removed, and post space was prepared using peeso reamers #2 and #3 consecutively. After fabricating the acrylic resin patterns of the posts and cores, they were cast using Ni-Cr metal alloy. The specimens were divided into 4 groups in which the castings were cemented using one of the following luting agents: zinc phosphate (ZP), glass ionomer (GI), Panavia F 2.0, and Speed CEM. After cementation, the teeth were immersed in distilled water and incubated for 7 days. Then, the teeth were subjected to thermocycling, immersed in silver nitrate for 6 hours, and finally sectioned. The degree of dye penetration into the coronal part of the specimens was measured using a stereomicroscope. Data were analyzed using Kruskal-Wallis and Mann-Whitey U tests with significance level of 0.05. Results: The median microleakage in ZP, Speed CEM, GI, and Panavia were 171.89, 114.76, 26.51, and 20.02 μm, respectively. Pairwise comparisons among GI and ZP, GI, and Speed CEM, ZP and Panavia, ZP and Speed CEM, and Panavia and Speed CEM groups yielded significant differences (p < 0.05). Conclusion: Complete coronal seal was not achieved with any of the luting agents. The highest and the lowest degree of microleakage was yielded by ZP and Panavia luting agents, respectively. © 2018 by the American College of Prosthodontists
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2. Fracture Strength of Endodontically Treated Maxillary Central Incisors Restored With Nickel Chromium and Nonprecious Gold Alloy Casting Post and Cores, Journal of Contemporary Dental Practice (2018)
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