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2. Biologic Effects of Dental Materials;Spangberg;Oral Surg,1973
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4. Effect of Root Canal Filling Material N2 When Used for Filling After Partial Pulpectomy;Engstrom;Sven. Tandlak. Tidskr,1969
5. Overfilling in Root Canal Treatment;Orlay;Br. Dent. J,1966