title: Survival rate and fracture strength of incisors restored with different post and core systems after exposure in the artificial mouth.
abstract: The survival rate and fracture resistance of 40 decapitated endodontically treated maxillary central incisors using four different post and core systems covered with all-ceramic copings was evaluated after exposure in the artificial mouth. Ten samples of the following post and core systems were investigated: high precious metal post (Permador) and core (Olympia) (A), zirconia post (Cerapost) with a pre-fabricated bonded ceramic core (Ceracap) (B), resin-ceramic post (experimental) with a pre-fabricated bonded ceramic core (Ceracap(R)) (C) and a zirconia post (Cerapost) with a custom made ceramic core (Cosmo Ingots) (D). The all-ceramic copings (Procera) were cemented using Panavia TC. The survival rates after 1 200 000 cycles in the artificial mouth are as follows: 90% (A), 80% (B), 60% (C) and 100% (D). The results of the means and standard deviations (s.d.) of the fracture resistance during static loading are: 1270 +/- 312.5 (A), 1494.5 +/- 333.5 (B), 1146.7 +/- 182.6 (C) and 463.3 +/- 46.2 (D). There are statistically significant differences between all groups with the exception of A and B, and A and C (Wilcoxon test). None of the zirconia posts with custom made ceramic cores covered with all-ceramic copings fractured during dynamic loading in the artificial mouth. The mean fracture strength during static loading was less favourable than that of groups A, B and C but above the clinical necessary level.
authors: Department of Prosthodontics, Albert-Ludwigs University, Freiburg, Germany. Strub@ZMK2.UKL.Uni-Freiburg.DE
authors: J R
authors: JR
authors: Strub
authors: O
authors: O
authors: Pontius
authors: S
authors: S
authors: Koutayas
mesh_terms: D002484:Cementation; D002516:Ceramics / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D000044:Dental Abutments; D003722:Dental Alloys / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry; D019232:Dental Restoration Failure; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D007180:Incisor / Q000503:physiopathology*; D016876:Metal Ceramic Alloys / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry; D012390:Root Canal Therapy; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D016019:Survival Analysis; D014025:Titanium / Q000737:chemistry; D014082:Tooth Fractures / Q000503:physiopathology*; D015036:Zinc Phosphate Cement / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D008689:Methacrylates; C077451:Procera; D019279:Resin Cements; D003776:Dental Porcelain; C091744:Panavia TC; C049241:olympia; D015036:Zinc Phosphate Cement; D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide