Effect of reinforcement with resin composite on fracture strength of structurally compromised roots.
This study was aimed at evaluating the fracture resistance of structurally compromised roots restored with four different post and core systems. Thirty-two bovine roots were uniformly shaped to simulate human mandibular premolar roots. The roots were divided into four groups based on the type of restoration: cemented cast post and core (Group MC), resin composite build-up (Group CR), resin composite and prefabricated glass fiber post build-up (Group FRC), and thick-layer dual-cured resin composite-reinforced small-diameter tapered cast post and core (Group CRM). After a static loading test, the failure mode and fracture resistance were recorded. Group CRM (719.38+/-196.73 N) exhibited a significantly high fracture resistance compared with the other groups (Group MC: 429.56+/-82.43 N; Group CR: 349.56+/-66.21 N; Group FRC: 398.94+/-112.71 N; p<0.05). In conclusion, Group CRM exhibited better mechanical properties for structurally compromised roots with no ferrules, although all types of restorations showed non-restorable fracture modes.
Fukui
Yuji
Y
Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan. fukui.fpro@tmd.ac.jp
Komada
Wataru
W
Yoshida
Keiichi
K
Otake
Shiho
S
Okada
Daizo
D
Miura
Hiroyuki
H
D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000627:therapeutic use*; D003786:Dental Pulp Cavity / Q000473:pathology; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D004195:Disease Models, Animal; D055119:Elastic Modulus; D011176:Post and Core Technique / Q000295:instrumentation*; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000473:pathology* / Q000517:prevention & control; D014092:Tooth Root / Q000473:pathology*; D019553:Tooth, Nonvital / Q000473:pathology
D003188:Composite Resins