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Related to primary dentin: circumpulpal dentin

PRIMARY. That which is first or principal; as primary evidence, or that evidence which is to be admitted in the first instance, as distinguished from secondary evidence, which is allowed only when primary evidence cannot be had.
     2. A primary obligation is one which is the principal object of the contract; for example, the primary obligation of the seller is to deliver the thing sold, and to transfer the title to it. It is distinguished from the accessory or secondary obligation to pay damages for not doing so. 1 Bouv. Inst. n. 702.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Although several studies have evaluated the immediate bond strength of simplified adhesive systems to permanent and primary dentin, the results obtained are still controversial.
In the immediate evaluation, values obtained for primary dentin were lower than those of permanent dentin.
Data from literature demonstrates that adhesion force of composite resin systems, as applied to primary dentin, ranges from 5.53 to 70.1 MPa.
The purpose of this study was to investigate the influence of storage and exfoliation modes of primary teeth, on the tensile bond strength of a self etch adhesive system to primary dentin. In addition, the adhesive interfaces were analyzed by SEM to observe differences in hybrid layer formation among groups.