Fibre posts and tooth reinforcement
Fig. 1: Especially in ovoid canals post preparation can needlessly remove dentine and result in weakening the remaining tooth structure, while leaving lateral gutta percha which compromises bonding/cementation.
Fig. 2: To seat the inserted parallel sided post into the tapered canal would require more apical removal of vital dentinal structure needlessly weakening the root and creating an apical stress point.
Fig. 3: The taper of the Macro-Lock post allows respect for the dentine and ensures a more even and minimal amount of surrounding composite resin, thereby reducing polymerisation contraction forces.
Fig. 4: In irregular or ovoid canals, the use of Fibercones lateral to the Macro-Lock X-RO has many clinical advantages, increasing longevity.
Fig. 5: A clinical photograph showing the placement of Fibercones laterally to the main Macro-Lock Post, which decreases composite volume, adds anti-rotational elements, and decreases microleakage
Fig. 6a: The common aesthetic failure when using metallic posts with discoloration of the tooth structure, as well as the gingival collar.(Courtesy of Dr Frank Milnar)
Fig. 6b: The result of placing a light transmitting fibre post with a translucent ceramic. (Courtesy of Dr Frank Milnar)
Fig. 7: The typical result of creating a full crown with a ferrule in a moderately tapered endodontic access opening.
Fig. 8: When preparing a ferrule on a tooth with a wide flare, the preparation removes all lateral dentine, creating a standalone core, which drastically decreases the clinical success rate.
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