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The present investigation demonstrates that direct application of a composite resin on an acid-etched, vital dentin surface is hazardous to the pulp in monkey teeth. This indicates that exposed dentin should be protected before treating the tooth with a restorative technique including acid etching. A ca(OH)2-containing base material showed promising qualities as a protective liner for this kind of restorative treatment.
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Harald M. Eriksen (1976) studied this question.
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