title: Fracture resistance of four different restorations for cuspal replacement.
abstract: The purpose of this study was to compare the fracture resistance of four posterior restorations involving an entire cusp replacement. Four groups were established, each containing eight caries-free mandibular molars, similar in size and anatomic form. A mesio-occlusal preparation including the lingual cusp was prepared on all teeth. Group A were restored with a pin-retained amalgam. Group B were restored with amalgam and a meta adhesive. Group C were restored with a composite resin with a beta-glass quartz insert. Group D were restored with composite resin and a HEMA adhesive. All specimens were mounted in acrylic and stored in artificial saliva for 30 days. Each specimen was loaded in compression at a 90 degrees angle in an Instron testing machine with a crosshead speed of 0.5 cm/min. Results demonstrated the mean (SD) failure loads in kilograms for each group to be: A, 1155 (388); B, 1232 (436); C, 1345 (375); D, 1595 (373). Analysis of variance indicated no significant difference among groups at P<0.05. Although the values for the composite resin restoration with the adhesive were higher than the other restorative techniques.
authors.affiliation: Department of Hospital Dentistry, University of Iowa, Iowa City, USA. segura@uthsca.edu
authors.forename: A
authors.initials: A
authors.lastname: Segura
authors.forename: R
authors.initials: R
authors.lastname: Riggins
mesh_terms: D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003737:Dental Cavity Preparation; D003772:Dental Pins; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry; D008963:Molar; D011791:Quartz / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D000269:Adhesives; C070606:Amalgambond; C088834:Beta-Quartz glass-ceramic; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; D012464:Saliva, Artificial; C084018:Scotchbond Multi-Purpose; D011791:Quartz; D020366:Methylmethacrylate; D017438:Bisphenol A-Glycidyl Methacrylate; C005044:hydroxyethyl methacrylate; C034139:4-methacryloxyethyltrimellitic acid anhydride; D003723:Dental Amalgam