title: Comparative Microstrain Study of Internal Hexagon and Plateau Design of Short Implants Under Vertical Loading.
abstract: OBJECTIVE
  To quantify microstrain development during axial loading using strain gauge analysis for short implants, varying the type of fixture-abutment joint and thread design.
  
  
  METHODS
  An internal hexagon implant (4 × 8 mm) and a plateau design implant (4 × 8 mm) were embedded on the center of 10 polyurethane blocks with dimensions of 190 × 30 × 12 mm. The respective abutments were screwed onto the implants. Four strain gauges (SGs) were bonded onto the surface of each block, and 4 vertical SGs were bonded onto the side of each block. Axial load of 30 kgf was applied for 10 seconds in the center of each implant.
  
  
  RESULTS
  The data were analyzed statistically by analysis of variance for repeated measures and Tukey test (P < 0.05). The interaction between implant and region factors have been statistically significant (P = 0.0259). Tukey test revealed a difference on plateau's horizontal region. The cervical region presented higher microstrain values, when compared with the medium and apical regions of the implants.
  
  
  CONCLUSIONS
  Within the purpose of the study, the type of fixture-abutment joint is a relevant factor to affect the amount of stress/strain in bone simulation. The microstrain development was concentrated on the cervical region of the implant.
authors.affiliation: *Professor, Department of Dental Materials and Prosthodontics, School of Dentistry, Julio de Mesquita Filho, São Paulo State University, UNESP, São José dos Campos, Brazil. †PhD Student, Department of Dental Materials and Prosthodontics, School of Dentistry Julio de Mesquita Filho, São Paulo State University, UNESP, São José dos Campos, Brazil. ‡Master's Student, Department of Dental Materials and Prosthodontics, School of Dentistry, Julio de Mesquita Filho, São Paulo State University, UNESP, São José dos Campos, Brazil. §Professor, Department of Surgery, School of Dentistry, São Paulo State University, UNESP, Araçatuba, Brazil.
authors.forename: Renato Sussumu
authors.initials: RS
authors.lastname: Nishioka
authors.forename: Vinicius Anéas
authors.initials: VA
authors.lastname: Rodrigues
authors.forename: Leandro Ruivo
authors.initials: LR
authors.lastname: De Santis
authors.forename: Gabriela Nogueira De Melo
authors.initials: GN
authors.lastname: Nishioka
authors.forename: Vivian Mayumi Miyazaki
authors.initials: VM
authors.lastname: Santos
authors.forename: Francisley Ávila
authors.initials: FÁ
authors.lastname: Souza
mesh_terms: D059605:Dental Implant-Abutment Design / Q000295:instrumentation / Q000379:methods; D003757:Dental Implantation / Q000295:instrumentation / Q000379:methods; D003799:Dental Stress Analysis / Q000379:methods