title: Fracture resistance of the implant-abutment connection in implants with internal hex and internal conical connections under oblique compressive loading: an in vitro study.
abstract: The objective of this study was to verify if differences in the design of internal hex (IH) and internal conical (IC) connection implant systems influence fracture resistance under oblique compressive forces. Twenty implant-abutment assemblies were utilized: 10 with IH connections and 10 with IC connections. Maximum deformation force for IC implants (90.58 +/- 6.72 kgf) was statistically higher than that for IH implants (83.73 +/- 4.94 kgf) (P = .0182). Fracture force for the IH implants was 79.86 +/- 4.77 kgf. None of the IC implants fractured. The friction-locking mechanics and the solid design of the IC abutments provided greater resistance to deformation and fracture under oblique compressive loading when compared to the IH abutments.
authors: Department of Dental Materials and Prosthodontics, Dental School of Ribeirão, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors: Abílio Ricciardi
authors: AR
authors: Coppedê
authors: Edmilson
authors: E
authors: Bersani
authors: Maria da Gloria Chiarello
authors: Mda G
authors: de Mattos
authors: Renata Cristina Silveira
authors: RC
authors: Rodrigues
authors: Ivete Aparecida de Mattias
authors: IA
authors: Sartori
authors: Ricardo Faria
authors: RF
authors: Ribeiro
mesh_terms: D000044:Dental Abutments; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D017276:Friction; D006801:Humans; D008422:Materials Testing; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D015921:Dental Implants