Dowel space preparation and the apical seal.
D004396:Coloring Agents; D003442:Crowns; D001840:Dental Bonding; D003763:Dental Leakage / Q000175:diagnosis / Q000209:etiology*; D006171:Gutta-Percha; D006801:Humans; D011176:Post and Core Technique; D012389:Root Canal Obturation; D013499:Surface Properties
D004396:Coloring Agents; D006171:Gutta-Percha