Author/Authors :
cekic-nagas, isil gazi university - faculty of dentistry - department of prosthodontics, Ankara, turkey , nagas, emre hacettepe university - faculty of dentistry - department of endodontics, Ankara, Turkey , egilmez, ferhan gazi university - faculty of dentistry - department of prosthodontics, Ankara, turkey , ergun, gulfem gazi university - faculty of dentistry - department of prosthodontics, Ankara, turkey , vallittu, pekka kalevi welfare division, Turku, finland , vallittu, pekka kalevi university of turku - turku clinical biomaterials centre–tcbc, institute of dentistry - department of biomaterials science, Turku, Finland
Abstract :
OBJECTIVE: This study aimed to evaluate the fracture load of endocrown restorations and fiber-reinforced composites (FRCs) fabricated through computer-aided design/computer-aided manufacturing (CAD-CAM) for post.cores of anterior teeth.MATERIALS AND METHOD: Forty post.core-supported crowns and endocrowns were fabricated through CAD-CAM on a canine root zirconia model (Ice Zirconia, ZirkonZahn GmBH, Bruneck, Italy). The static load-bearing capacity was measured on the following restoration groups: Group 1: zirconia crown (Prettau anterior, ZirkonZahn GmBH) retained with CAD-CAM one-piece FRC post-core crown system (experimental CAD-CAM FRC block); Group 2: zirconia crown (Prettau anterior) retained with FRC post (GC Corp., Tokyo, Japan) with discontinuous fiber composite (EverX posterior, GC Corp) core; Group 3: zirconia endocrown (Prettau anterior); and Group 4: lithium disilicate ceramic endocrown (IPS e.max CAD, Ivoclar Vivadent AG, Schaan, Liechtenstein) (n = 10/per group). After the adhesive cementation of crowns/endocrowns to the zirconia root model, a load was applied at 45 ‹ to the long axis of the teeth and measured using a universal testing machine. The fracture modes were visually examined. The statistical analyses were performed using one-way ANOVA and Tukey post-hoc tests (p 0.05).RESULTS: The fracture load significantly differed among the groups (p 0.05) and was ranked as follows: Group 3 (1168 } 141 N) Group 4 (721 } 96 N) . Group 1 (680 } 86 N) Group 2 (534 } 36 N).CONCLUSION: Endocrown monoblock restorations canbe used as an alternative to fiber-reinforced post core supported crown restorations.
NaturalLanguageKeyword :
Ceramics , computer , aided design , computer , aided manufacturing , post and core technique
