title: Effect of ferrule height and glass fibre post length on fracture resistance and failure mode of endodontically treated teeth.
abstract: The purpose of this study was to evaluate the combined effect of ferrule height and post length on fracture resistance and failure mode of endodontically treated teeth restored with glass fibre posts, composite resin cores and crowns. Ninety human maxillary central incisors were endodontically treated and divided into three groups (n = 30) according to the ferrule heights: 4, 2 and 0 mm, respectively. Post spaces in each group were prepared at 2/3, 1/2 and 1/3 of the root length (n = 10). The specimens were received fibre posts, composite resin core build up and cast metal crowns. After thermocycling, compressive static load was applied at an angle of 135° to the crowns. Two-way analysis of variance showed significant differences in the failure load in the ferrule height groups, no significant differences in post length groups and no significant interaction between ferrule heights and post lengths. More restorable failure modes were observed.
authors.affiliation: Department of Conservative Dentistry, Faculty of Dentistry, MAHSA University College, Kuala Lumpur, Malaysia.
authors.forename: Shurooq S
authors.initials: SS
authors.lastname: Abdulrazzak
authors.forename: Eshamsul
authors.initials: E
authors.lastname: Sulaiman
authors.forename: Basim K
authors.initials: BK
authors.lastname: Atiya
authors.forename: Marhazlinda
authors.initials: M
authors.lastname: Jamaludin
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003442:Crowns; D003722:Dental Alloys / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D014082:Tooth Fractures / Q000503:physiopathology*; D019231:Tooth Preparation, Prosthodontic / Q000295:instrumentation*; D019553:Tooth, Nonvital / Q000503:physiopathology / Q000628:therapy*
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials; C483701:Rely X Unicem; D019279:Resin Cements; C009753:fiberglass; C533204:filtek Z350
keywords: failure mode; ferrule height; fracture resistance; glass fibre post; post length