The methods of preparation of dental tissues, treatment of the dentine wound and filling materials, which replace the hard dental tissues, are discussed to evaluate their features in toward the requirements for biological harmlessness. Based on the literature data, their own clinical and practical experiences, the authors have found that none of the currently used preparation methods as well as supports or filling materials are fulfilling the biological treatment requirements. Therefore, it is necessary to be aware of this fact, and adjust the medical procedures in such a way to avoid the harmful effects or to suppress then as much as possible until the ideal preparation procedures and filling materials will be developed.
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