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Published on: February 10, 2014
Microleakage at Different Implant-Abutment Connections Under Unloaded and Loaded Conditions
João Paulo da Silva-Neto1, Marcel Santana Prudente, Talita Souza Dantas
1*Professor, Department of Prosthodontics, School of Dentistry, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil. †PhD Student, Department of Occlusion, Fixed Prostheses, and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil. ‡PhD Student, Department of Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. §Professor, Department of Prosthodontics, Health Sciences Center, Unigranrio University, Duque de Caxias, Rio de Janeiro, Brazil. ¶Titular Professor, Department of Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. ‖Associate Professor, Department of Occlusion, Fixed Prostheses, and Dental Materials, Dentistry School, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil.
Purpose:
This study evaluated the microleakage at different implant-abutment (I-A) connections under unloaded and loaded conditions.
Materials And Methods:
Forty implants, specially designed with an opening at the apex, were grouped according to the I-A and screw device: external hexagon implants with titanium (EH) or EH diamond-like carbon screws fixing the abutment; internal hexagon implants with titanium screws (IH); and Morse taper implants with solid (MT) or MT passing screws (MTps) abutments. The implants were fixed in a 2-compartment device, and toluidine blue solution (1.0 mg/mL) was placed at the I-A interface (upper compartment). The lower compartment was filled with purified water. Four implants of each group were loaded (50 N, 1.2 Hz) and after 50,000, 100,000, 200,000, and 300,000 cycles, aliquots were collected from the lower compartment for absorbance reading. Data were analyzed using analysis of variance for repeated measurements and Tukey (α = 0.05).
Results:
Although microleakage increased over time in most of the groups, MTps group showed lower values when loaded (P < 0.05). The DLC on the EH screw did not prevent microleakage (P < 0.05).
Conclusion:
It can be concluded that MT connection is more effective to prevent microleakage.
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