title: Flexibility of technopolymer clasps compared with cobalt-chromium and titanium clasps.
abstract: Patients often cite lack of retention and poor aesthetics as reasons for not wearing their partial dentures. Traditional metal alloy clasps have been shown to exert forces on abutment teeth that exceed those capable of producing tooth movement. In addition, metal display on anterior teeth is often unacceptable. The technopolymer materials are purported to have superior flexibility and exert less force than the metals. This study compared the flexibility and forces produced by technopolymer clasps with those exerted by cobalt-chromium and titanium clasps. The results showed that the technopolymer clasps were up to ten times as flexible as the metal clasps, and they returned to their pretest dimensions after being stretched. In addition, they exerted forces on the abutment teeth that fall within the range of those considered safe for use. This coupled with their pleasing aesthetics makes them suitable for use on periodontally compromised teeth, those with deep undercuts and on anterior teeth.
authors.affiliation: Department of Prosthetic Dentistry, School of Oral Health Sciences, University of the Witwatersrand, Johannesburg.
authors.forename: L M
authors.initials: LM
authors.lastname: Sykes
authors.forename: H D
authors.initials: HD
authors.lastname: Dullabh
authors.forename: H D
authors.initials: HD
authors.lastname: Chandler
authors.forename: B
authors.initials: B
authors.lastname: Bunn
authors.forename: A R M
authors.initials: AR
authors.lastname: Essop
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid / Q000502:physiology; D002858:Chromium Alloys / Q000737:chemistry*; D000044:Dental Abutments; D003722:Dental Alloys / Q000737:chemistry*; D016734:Dental Clasps; D017267:Dental Prosthesis Design; D004548:Elasticity; D004955:Esthetics, Dental; D006801:Humans; D018583:Pliability; D011108:Polymers / Q000737:chemistry*; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014800:Vitallium / Q000737:chemistry; D016474:Weight-Bearing
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D011108:Polymers; D014800:Vitallium; D014025:Titanium