Scientific Literature



Purpose: This study aimed to evaluate the survival probability of four narrow-diameter implant systems when subjected to fatigue loading.


Materials & Methods: Seventy two narrow-diameter implants to be restored with single-unit crowns were divided into four groups (n = 18): Astra Tech (3.5-mm diameter), with a standard connection (ASC); BioHorizon (3.4-mm diameter), with a standard connection (BSC); Intra-Lock (3.4-mm diameter), with a standard multilobular connection (ISC); and Intra-Lock (3.4-diameter), with a modified square connection (IMC). The corresponding abutments were screwed onto the implants, and standardized metal crowns (maxillary central incisors) were cemented and subjected to step-stress accelerated life testing in water. Use-level probability Weibull curves and reliability for 100,000 cycles at 150 and 200 N (90% two-sided confidence intervals) were calculated. Polarized light and scanning electron microscopes were used to access the failure modes.


Results: The calculated survival probability for 100,000 cycles at 150 N was approximately 93% in group ASC, 98% in group BSC, 94% in group ISC, and 99% in group IMC. At 200 N, the survival rate was estimated to be approximately < 0.1% for ASC, 77% for BSC, 34% for ISC, and 93% for IMC. Abutment screw fracture was the main failure mode for all groups.


Conclusions: Although the probability of survival was not significantly different among systems at a load of 150 N, a significant decrease was observed at 200 N for all groups except IMC.

Mechanical Evaluation of Four Narrow-Diameter Implant Systems


Ronaldo Hirata, DDS, MS, PhDa / Estevam A. Bonfante, DDS, MS, PhDb / Lucas S. Machado, DDS, MS, PhDc / Nick Tovar, PhDd / Paulo G. Coelho, DDS, BS, MS, MSMtE, PhDe


a  Assistant Professor, Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, New York, USA.


b  Assistant Professor, Department of Prosthodontics, University of São Paulo, Bauru College of Dentistry, Bauru, São Paulo, Brazil.


c  Postdoctoral Candidate, Department of Operative Dentistry, São Paulo State University, Araçatuba, São Paulo, Brazil.


d  Adjunct Assistant Professor and Director of Material Analysis and Testing Laboratory, New York University College of Dentistry, New York, New York, USA.


e  Associate Professor, Director for Research, Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, New York, USA; Affiliated Faculty, Division of Engineering, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.


Int J Prosthodont 2014;27:359–362. doi: 10.11607/ijp.3926


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