Cuspal deflection in class V cavities restored with composite resins

Jun-Gyu Park; Bum-Soon Lim; In-Bog Lee

doi:10.5395/JKACD.2008.33.2.083

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Park, Lim, and Lee: Cuspal deflection in class V cavities restored with composite resins

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2008; 33(2): 83-89.

Published online: 31 March 2008

DOI: https://doi.org/10.5395/JKACD.2008.33.2.083

Cuspal deflection in class V cavities restored with composite resins

Jun-Gyu Park¹, Bum-Soon Lim², In-Bog Lee¹

¹Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea.

²Department of Dental Biomaterials Science, School of Dentistry, Seoul National University, Korea.

Corresponding Author: In-Bog Lee. Department of Conservative Dentistry, School of Dentistry, Seoul National University, 275-1 Yeongeon-Dong, Jongno-Gu, Seoul 110-768, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr

Received 24 January 2008 Revised 15 February 2008 Accepted 22 February 2008

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

The amounts of cuspal deflection restored with Filtek flow or Z-250 were 2.18 ± 0.92 µm and 2.95 ± 1.13 µm, respectively. Filtek flow showed less cuspal deflection but there was no statistically significant difference (p > 0.05).
The two specimens in each group showed gap at the inner portion of the cavity.
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).
The cuspal deflection depends not only on the polymerization shrinkage but also on the modulus of elasticity of composites.

Keywords: Cuspal deflection, Composite resin, Polymerization shrinkage, Modulus of elasticity, Bonded interface

Figures and Tables

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.

Table 1

Mean tooth size used in this study

(CT-CEJ: distance between buccal cusp tip and cemento-enamel junction, BL: maximum bucco-lingual width, MD: maximum mesio-distal width)

Table 2

Mean flexural strength, modulus of elasticity and polymerization shrinkage of composites

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