MTA is equivalent to vitremer in preventing microleakage when used as retrograde filling material.
OBJECTIVE: To evaluate the acid-soluble Arsenic, Lead, and Chromium contents in the two varieties of Mineral Trioxide Aggregate (MTA) using Atomic Absorption Spectrophotometry. METHODOLOGY: Analysis of Arsenic, Lead, and Chromium in the two products of MTS [MProRoot MTA and MTA Angelus] were done using graphite furnace atomic absorption spectrophotometry employing 2.4 mol/L of hydrochloric acid for digestion of materials. The test materials were subjected to incubate in water and simulated body fluid (SBF) so that the leach out metal ions from the material can also be quantified. Descriptive statistics reported along with ANOVA for comparison of quantitative analysis of Arsenic, Lead, and Chromium in the extracts of the two MTA products. One way ANOVA was applied to compare the leach out of metals over 15 days. Level of significance was kept at 0.05. RESULTS: Both varieties of MTA [ProRoot MTA and MTA Angelus] leached out extracts into water and SBF showing lower values of Arsenic and Lead contents in accordance to the limit set by ISO 9917-1 (2007). However, extracts of both the products had comparatively higher amount of Chromium ions. CONCLUSIONS: The total amount of Arsenic, Chromium, and Lead released from the two cements were found to be far below than what is considered as clinically harmful. KEYWORDS: Chromium; Arsenic; Lead, heavy metals; Mineral trioxide aggregate HOW TO CITE: Khan TN, Khan FR. Determination of lead, arsenic and chromium contents in two types of mineral trioxide aggregate using atomic absorption spectrometry. J Pak Dent Assoc 2020;29(4):223-227.
Objective: To compare the microleakage around resin modified glass ionomer cement (RMGIC) based sealants and flowable resin based sealants placed with or without ameloplasty in extracted human teeth. Methods: This in-vitro experimental study was conducted at the Operative Dentistry Department, Dow University of Health Sciences, Karachi, Pakistan from June 2017 to December 2018. Sixty extracted human molars and premolars were assigned to four groups (n=15) each, according to the type of fissure sealant (flowable resin based sealant or resin modified glass ionomer based sealant) used and either placed with or without ameloplasty. Specimens were thermocycled and then immersed in 1% methylene blue for 24 hours. Specimens were then sectioned and examined using stereo-microscope (50X) for microleakage that was scored on an ordinal scale. Mann-Whitney U test and Ordinal regression were applied. Level of significance kept at 0.05. Results: There was a statistically significant difference (p-value <0.001) between the two sealant types for the microleakage scores. Sealants placed with ameloplasty demonstrated significantly higher microleakage values (p-value <0.001). Conclusion: Microleakage was found to be more pronounced in RMGIC based sealants compared to the resin based sealants. Ameloplasty resulted in higher leakage around the sealants irrespective of the chemistry of material. doi: https://doi.org/10.12669/pjms.36.3.1268 How to cite this:Khan TN, Khan FR, Abidi SYA. Ameloplasty is counterproductive in reducing microleakage around Resin Modified Glass Ionomer and Resin based fissure sealants. Pak J Med Sci. 2020;36(3):---------. doi: https://doi.org/10.12669/pjms.36.3.1268 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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