Journal: Drug Invention Today

Article Id: JPRS-Pcol-00002539
Title: Evaluation of non-metal inclusions in nickel–chromium crowns employing optical metallography
Category: Pharmacology
Section: Research Article
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    Background: Complete veneer crowns are the best possible treatment option for the correction of severely damaged, endodontically treated teeth and also an important component of fixed partial denture. Metal crowns are superior interms of their strength and longevity. The presence of inclusion defects affects the mechanical properties of the metal, thereby compromising the clinical performance of the crowns. Aim: The aim of this study is to determine the type and number of non-metallic inclusions present in the nickel–chromium (Ni–Cr) crowns. Materials and Methods: A sample of 10 Ni–Cr crowns were prepared, disectioned, and illuminated, and the presence of different types of inclusions was determined under optical microscope which utilizes visible light and a system of magnifying lenses for microscopic analysis of grain structure and arrangement. The results were analyzed with one-way ANOVA and Tukey honest significant difference post hoc test. Results: The mean number of oxide inclusions in the crowns was 4.53 ± 1.22, silicate inclusions was 6.33 ± 2.68, and sulfide inclusions was 3.44 ± 2.47, respectively. One-way analysis of variance showed a significant difference between the oxide, silicate, and sulfide inclusions (F = 26.12, P < 0.001). Post hoc tests revealed no significant differences with respect to the oxide inclusions in the incisal, middle, and cervical regions (P > 0.05). With respect to silicate inclusions, significant differences were observed between incisal middle-thirds and cervical middle-thirds (P < 0.05). With respect to sulfide inclusions, significant differences were present between incisal middle-thirds and incisal cervical-thirds (P < 0.05). Conclusion: Oxide, silicate, and sulfides are the non-metallic inclusions present in Ni–Cr crowns. These inclusions are distributed along the entire surface of the crowns and can compromise the longevity in future.

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    Author(s) Name:

    Y. Sivanagini 1 , Ashish R. Jain2 *, Dhanraj Ganapathy2 , Koneru Samyuktha1

    Affiliation(s) Name:

    1 Department of Prosthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu, India,

    2 Department of Prosthodontics, Saveetha Dental College, Saveetha Institute Of Medical and Technical Sciences, Chennai, Tamil Nadu, India

    *Corresponding author: Dr. Ashish R. Jain,Department of Prosthodontics, Saveetha Dental College and Hospital, Saveetha University, Poonamalle High Road, Chennai - 600 127, Tamil Nadu, India

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    Author:

    Y. Sivanagini 1 , Ashish R. Jain2 *, Dhanraj Ganapathy2 , Koneru Samyuktha1

    Title:Evaluation of non-metal inclusions in nickel–chromium crowns employing optical metallography
    Journal:Drug Invention Today
    Vol(issue):10 (Oct)
    Year:2018
    Page No: (1976-1980)
  • Experimental Methods Keywords

    Methodology:Optical metallography, Surface defects
    Research Materials:Non-metallic inclusions

Keywords

Dental crowns Non-metallic inclusions Optical metallography Surface defects

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