The correlation between the wall‐to‐wall polymerization contraction close to the surface and the marginal gap in the deeper parts of chemically cured resin fillings was investigated. The investigation was carried out with fillings placed in non‐etched dentin cavities in extracted human teeth. A negative correlation was found; i.e. the narrower the marginal gap in the upper part of the cavities, the more pronounced the contraction in the deeper parts of the fillings, and vice versa.
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Erik Keith Hansen (1982) studied this question.
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