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A Study1 by Sufyan k garoushi, Lippo v .j. lasilla and Pekka k. vallittu with a sample size of 45 permanent maxillary central incisors on Direct composite resin restoration of an anterior tooth: Effect of Fiber-reinforced composite substructure.European journal of prosthodontics and restorative dentistry,2007 Vol .15,no.2,pp 61-66. ................
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