Table 1 Overview of the experimental groups
Group | Description | Preparation | Materials for root canal restoration |
|---|---|---|---|
1 (n = 16) | Non-flared, closed apex root canals | White-Yellow RelyX™ post drills. | (FRC) post (RelyX™, 3 M Oral Care, St. Paul, MN, United States) |
2 (n = 16) | Simulated flared root canals, open apex. | Flare: White-Yellow-Red-Blue RelyX™ post drills. Open apex: Peeso reamer size #1 - #6 | (FRC) post (RelyX™, 3 M Oral Care, St. Paul, MN, United States) |
3 (n = 16) | Simulated flared root canal, closed apex | Flare: White-Yellow-Red-Blue RelyX™ post drills. | (FRC) post (RelyX™, 3 M Oral Care, St. Paul, MN, United States) |
4 (n = 16) | Simulated flared root canals, open apex. | Flare: White-Yellow-Red-Blue RelyX™ post drills. Open apex: Peeso reamer size #1 - #6 | Customized (FRC) posts (RelyX™, 3 M Oral Care, St. Paul, MN, United States) relined with flowable E-glass discontinuous short fiber-reinforced composite resin (everX Flow™ Bulk, GC, Tokyo, Japan) |
5 (n = 16) | Simulated flared root canal, closed apex | Flare: White-Yellow-Red-Blue RelyX™ post drills. | Customized (FRC) posts (RelyX™, 3 M Oral Care, St. Paul, MN, United States) relined with flowable E-glass discontinuous short fiber-reinforced composite resin (everX Flow™ Bulk, GC, Tokyo, Japan) |