Influence of cavity size and restoration methods on the cusp deflection in composite restoration

Mi-Ra Lee; In-Bog Lee; Chang-In Seok; Sang-Tag Lee; Chung-Moon Um

doi:10.5395/JKACD.2004.29.6.532

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Lee, Lee, Seok, Lee, and Um: Influence of cavity size and restoration methods on the cusp deflection in composite restoration

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2004; 29(6): 532-540.

Published online: 30 November 2004

DOI: https://doi.org/10.5395/JKACD.2004.29.6.532

Influence of cavity size and restoration methods on the cusp deflection in composite restoration

Mi-Ra Lee, In-Bog Lee, Chang-In Seok, Sang-Tag Lee, Chung-Moon Um

Department of Conservative Dentistry, College of Dentistry, Seoul National University, Korea.

Corresponding author: Chung-Moon Um. Department of Conservative Dentistry, College of Dentistry, Seoul National University, 28 Yoengun-dong, Chongro-gu, Seoul, Korea, 110-749. Tel: 82-2-2072-3953, 2651 Fax: 82-2-2072-3859, inboglee@snu.ac.kr

(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 aim of this study was to measure the cusp deflection during composite restoration for MOD cavity in premolar and to examine the influence of cavity dimension, C-factor and restoration method on the cusp deflection.

Thirty extracted maxillary premolar were prepared to four different sizes of MOD cavity and divided into six groups. The width and depth of the cavity were as follows. Group 1; 1.5 × 1 mm, Group 2; 1.5 × 2 mm, Group 3; 3 × 1 mm, and Group 4-6; 3 × 2 mm respectively. Group 1-4 were restored using bulk filling method with Z-250 composite. However, Group 5 was restored incrementally, and Group 6 was restored with an indirect resin inlay.

The cusp deflection was recorded at the buccal and lingual cusp tips using LVDT probe for 10,000 seconds. The measured cusp deflections were compared between groups, and the relationship between the cube of the length of cavity wall/the cube of the thickness of cavity wall (L³ / T³), C-factor and cusp deflection or %flexure (100 × cuspal deflection / cavity width) was analyzed.

The cusp deflection of Group 1-4 were 12.1 µm, 17.2 µm, 16.2 µm and 26.4 µm respectively. The C-factor was related to the %flexure rather than the cusp deflection. There was a strong positive correlationship between the L³ / T³ and the cusp deflection. The cusp deflection of Group 5 and 6 were 17.4 µm and 17.9 µm respectively, which are much lower value than that of Group 4.

Keywords: Cusp deflection, Cavity dimension, C-factor, Bulk-cure, Incremental cure, Indirect resin inlay

Figures and Tables

Figure 1

Configuration of the instrument for measuring cusp deflection.

Figure 2

Diagram of prepared cavity.

a. The dimension of occlusal cavity and proximal box (W: Width of cavity, D: Depth of cavity, L: Length of cavity wall)

b. Simplified cavity shape for calculation of the C-factor.

Figure 3

Representative curves of cusp deflection as a function of time.

a. Bulk cure (Group 1-4)

b. Bulk cure vs. Incremental cure and Indirect Resin Inlay (Group 4, 5 and 6)

Figure 4

Mean cusp deflections for each tested group.

Figure 5

a. A positive correlationship was present between the L³/T³ and the cusp deflection.

b. A positive correlationship was present between the C-factor and the %flexure.

Table 1

The prepared cavity sizes in this study

Group 1-4; for bulk cure.

Group 5; for incremental cure.

Group 6; for indirect resin inlay.

Table 2

The prepared cavity wall dimension, the L³/T³, C-factor, cusp deflection and %flexure measured.

Standard deviations are in parenthesis.

%flexure = 100×(cusp deflection/cavity width) %

Table 3

The results of correlation analysis between the L³/T³, C-factor, and cusp deflection or %flexure.

^** Correlation is significant at the 0.01 level

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