Load capability of excessively flared teeth restored with fiber-reinforced composite posts and all-ceramic crowns.
This investigation evaluated the stabilizing effect of glass fiber reinforced posts (FRP) luted with self-adhesive universal cement on the fracture resistance of excessively flared endodontically treated teeth (ETT). Values were compared to teeth with no ferrule, 2 mm ferrule and resin cement for luting with 2 mm ferrule. Thirty-two caries-free maxillary central incisors were randomly assigned to 4 groups (n=8) and endodontically treated. Two groups were flattened 2 mm above and 2 groups at the cemen-to-enamel junction (CEJ). The teeth received FRPs as follows: 1) post was cemented with self-adhesive cement (RelyX Unicem, 3M ESPE) (U), no ferrule (F) was prepared, root canal entrance was excessively flared with a remaining wall thickness of 0.5 - 0.75 mm (UNF/flared); 2) post was cemented with U, no F was prepared; 3) post was luted with U, F was prepared; 4) post was cemented with a resin cement (Panavia F, Kuraray, Japan), F was prepared. All specimens were built-up using a resin composite (Clearfil Core, Kuraray). All-ceramic crowns were adhesively luted (U). Specimens were exposed to thermo-mechanical loading and statically loaded until failure. The mean fracture load values [N](SD) were: UNF/flared=68 (126); UNF=315 (136); UF=488 (72); PF=860 (190). All groups exhibited statistically significant differences regarding maximum fracture load (p<0.05).
Naumann
Michael
M
Dept of Prosthodontics and Geriatric Dentistry, Charité, Humboldt University, Berlin, Germany. michael.naumann@charite.de
Preuss
Anja
A
Frankenberger
Roland
R
D002484:Cementation; D003188:Composite Resins; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D005898:Glass; D006801:Humans; D007180:Incisor; D011176:Post and Core Technique; D019279:Resin Cements; D018915:Root Canal Preparation / Q000009:adverse effects*; D018709:Statistics, Nonparametric; D014082:Tooth Fractures / Q000209:etiology*; D019553:Tooth, Nonvital
D003188:Composite Resins; D017220:Dentin-Bonding Agents; C483701:Rely X Unicem; D019279:Resin Cements; C009753:fiberglass; D003776:Dental Porcelain