title: Analyzing the Influence of a New Dental Implant Design on Primary Stability.
abstract: BACKGROUND
  The macrogeometry of dental implants strongly influences the primary stability and hence the osseointegration process.
  
  
  OBJECTIVE
  Compare the performance of conventional and modified implant models in terms of primary stability.
  
  
  METHODS
  A total of 36 implants (Neodent®) with two different formats (n = 18): Alvim CM (Conical CM, Ø 4.3 mm × 10 mm in length) and Titamax Ti (Cylindrical HE, Ø 4.0 mm × 11 mm in length) were inserted into artificial bone blocks. Nine implants from each set were selected to undergo external geometry changes. The primary stability was quantified by insertion torque and resonance frequency using an Osstell device and the pullout test. One-way analysis of variance and Tukey's test were used for statistical evaluation.
  
  
  RESULTS
  The comparative analysis of the implants showed a significant increase of the insertion torque for the modified Conical CM implants (p = 0.000) and Cylindrical HE (p = 0.043); for the resonance frequency the modified Cylindrical HE showed a lower statistical mean (p = 0.002) when compared to the conventional model, and in the pullout test both modified implants showed significant reduction (p = 0.000).
  
  
  CONCLUSIONS
  Within the limitations of this study, the proposed modification showed good stability levels and advantages when compared to the conventional implants.
authors: Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
authors: Mariana Lima da Costa
authors: ML
authors: Valente
authors: Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
authors: Denise Tornavoi
authors: DT
authors: de Castro
authors: Department of Biomechanics, Medicine, and Rehabilitation of Locomotive Apparatus, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
authors: Antonio Carlos
authors: AC
authors: Shimano
authors: Department of Biomaterials, School of Dentistry of Uberaba, Uberaba, Brazil.
authors: César Penazzo
authors: CP
authors: Lepri
authors: Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
authors: Andréa Cândido
authors: AC
authors: dos Reis
mesh_terms: D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D066298:In Vitro Techniques; D016348:Osseointegration; D013499:Surface Properties; D019415:Torque
chemical_list: D015921:Dental Implants
keywords: bone substitutes; implant design; implant stability; osseointegration