J Korean Acad Conserv Dent.  2008 Mar;33(2):83-89. 10.5395/JKACD.2008.33.2.083.

Cuspal deflection in class V cavities restored with composite resins

Affiliations
  • 1Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea. inboglee@snu.ac.kr
  • 2Department of Dental Biomaterials Science, School of Dentistry, Seoul National University, Korea.

Abstract

The purpose of this study was to evaluate the effect of the polymerization shrinkage and modulus of elasticity of composites on the cusp deflection of class V restoration in premolars. The sixteen extracted upper premolars were divided into 2 groups with similar size. The amounts of cuspal deflection were measured in Class V cavities restored with a flowable composite (Filtek flow) or a universal hybrid composite (Z-250). The bonded interfaces of the sectioned specimens were observed using a scanning electron microscopy (SEM). The polymerization shrinkage and modulus of elasticity of the composites were measured to find out the effect of physical properties of composite resins on the cuspal deflection. The results were as follows. 1. The amounts of cuspal deflection restored with Filtek flow or Z-250 were 2.18 +/- 0.92 microm and 2.95 +/- 1.13 microm, respectively. Filtek flow showed less cuspal deflection but there was no statistically significant difference (p > 0.05). 2. The two specimens in each group showed gap at the inner portion of the cavity. 3. The polymerization shrinkages of Filtek flow and Z-250 were 4.41% and 2.23% respectively, and the flexural modulus of elasticity of cured Filtek flow (7.77 GPa) was much lower than that of Z-250 (17.43 GPa). 4. The cuspal deflection depends not only on the polymerization shrinkage but also on the modulus of elasticity of composites.

Keyword

Cuspal deflection; Composite resin; Polymerization shrinkage; Modulus of elasticity; Bonded interface

MeSH Terms

Bicuspid
Chimera
Collodion
Composite Resins
Elastic Modulus
Microscopy, Electron, Scanning
Polymerization
Polymers
Collodion
Composite Resins
Polymers

Figure

  • Figure 1 Specimen mounted on the cuspal deflection measuring instrument.

  • Figure 2 Mean cuspal deflection of class V composite restorations in premolars.

  • Figure 3-a SEM image of Z-250 specimen with a good bonding interface.

  • Figure 3-b SEM image of Z-250 specimen with a gap in the bonding interface.

  • Figure 3-c SEM image of Filtek flow specimen with a good bonding interface.

  • Figure 3-d SEM image of Filtek flow specimen with a gap in the bonding interface.


Cited by  4 articles

Effect of instrument compliance on the polymerization shrinkage stress measurements of dental resin composites
Deog-Gyu Seo, Sun-Hong Min, In-Bog Lee
J Korean Acad Conserv Dent. 2009;34(2):145-153.    doi: 10.5395/JKACD.2009.34.2.145.

Comparison of marginal microleakage between low and high flowable resins in class V cavity
Sang-Bae Bae, Young-Gon Cho, Myeong-Seon Lee
J Korean Acad Conserv Dent. 2009;34(6):477-483.    doi: 10.5395/JKACD.2009.34.6.477.

The change of the initial dynamic visco-elastic modulus of composite resins during light polymerization
Min-Ho Kim, In-Bog Lee
J Korean Acad Conserv Dent. 2009;34(5):450-459.    doi: 10.5395/JKACD.2009.34.5.450.

A survey on the use of composite resin in Class II restoration in Korea
Dong-Ho Shin, Se-Eun Park, In-Seok Yang, Juhea Chang, In-Bog Lee, Byeong-Hoon Cho, Ho-Hyun Son
J Korean Acad Conserv Dent. 2009;34(2):87-94.    doi: 10.5395/JKACD.2009.34.2.087.


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