Friday, March 16, 2018

Glass ionomer cements in pediatric dentistry: review of literature


Resident’s Name:        Carol Caudill                                                                           Date: 3/21/2018
Article Title: Glass ionomer cements in pediatric dentistry: review of literature
Author(s): Croll, TP and Nicholson, JW
Journal: Pediatric Dentistry
Date: 2002
Major Topic: Glass ionomer cements
Type of Article: background information
Main Purpose: To review the development and history of glass ionomer cements and their current role in pediatric dentistry
Key Points: (2 lines Max): Newer glass ionomer products have been modified to fix old disadvantages and take advantage of glass ionomer fluoride release, biocompatibility, and chemical bonding
·      Glass ionomer cements were invented in 1969. They are made out of calcium or strontium aluminofluorosilicate glass powder base and a water-soluble polymer acid. They set via acid-base reaction

Original self-hardening glass ionomer cements
·      Advantages
·               Fluoride ion release
·               Coefficient of thermal expansion similar to teeth
·               Biocompatibility
·               Chemical bonding to enamel and dentin
·      Disadvantages
·               Extended setting time
·               Poor wear resistance
·               Poor fracture strengths

Resin-modified glass ionomer restorative cements
·      Includes Vitrebond, Fuji II GC
·      Hardens initially by free radical photopolymerization of the resin component and then the glass ionomer setting reaction happens
·      These cements have all of the advantages of traditional glass ionomers.
·      Additional advantages compared to traditional glass ionomers:
·               Decrease in initial hardening time and handling difficulties
·               Increase in wear resistance and physical strength

Fluoride ion release and uptake
·      Glass ionomers can release fluoride for up to 5 years
·      This fluoride can be taken up by dentin and enamel, making the tooth less soluble. It also has an antimicrobial effect.

Glass ionomer luting cements
·      Glass ionomer luting cements can be used for cementing stainless steel crowns, space maintainers, and stainless steel orthodontic bands
·      Resin-modified glass ionomer luting cements can also be used for orthodontic bands and SSCs. The added strength makes band loosening uncommon

Glass ionomer/resin-based composite stratification
·      AKA the “sandwich technique”
·      Using a glass ionomer in conjunction with composite can significantly decrease post-op sensitivity and better mimic the original tooth structure

Bioactivity of glass ionomers
·      Glass ionomers can release ions besides fluoride like calcium and aluminum. These ions have the ability to promote remineralization of the tooth.
Remarks:
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Assessment of Article:  Level of Evidence/Comments: III-background information

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