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Dent Mater. 2008 Nov;24(11):1501-5. doi: 10.1016/j.dental.2008.03.013. Epub 2008 Apr 22.

How should composite be layered to reduce shrinkage stress: incremental or bulk filling?

Author information

1
Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea.

Abstract

OBJECTIVES:

The purpose of this study was to determine the effect of different layering techniques on cuspal deflection in direct composite restorations.

METHODS:

Aluminum blocks were used to prepare MOD cavities divided into three groups. Each cavity was restored with composite using three different filling techniques. Group 1 was filled in bulk, group 2 was restored by a horizontal increment technique, and group 3 by an oblique increment technique. Cuspal deflection was measured with LVDT probes and compared among groups using ANOVA and Scheffe's post hoc test (alpha = 0.05).

RESULTS:

The cuspal deflections in groups 1-3 were 21.6+/-0.90 microm, 19.3+/-0.73 microm and 18.4+/-0.63 microm, respectively. The bulk filling technique yielded significantly more cuspal deflection than the incremental filling techniques, while there was no significant difference between the horizontal and oblique increment methods.

SIGNIFICANCE:

Cuspal deflection resulting from polymerization shrinkage can be reduced by incremental filling techniques to obtain optimal outcomes in clinical situations.

PMID:
18433857
DOI:
10.1016/j.dental.2008.03.013
[Indexed for MEDLINE]

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