title: Relationship between the surface chemical composition of implants and contact with the substrate.
abstract: The purpose of the study was to use scanning electron microscopy and energy dispersive x-ray spectrometry to assess possible morphologic and chemical changes after performing double-insertion and pullout tests of implants of different shapes and surface treatments. Four different types of implants were used-cylindrical machined-surface implants, cylindrical double-surface-treated porous implants, cylindrical surface-treated porous implants, and tapered surface-treated porous implants-representing a total of 32 screws. The implants were inserted into synthetic bone femurs, totaling 8 samples, before performing each insertion with standardized torque. After each pullout the implants were analyzed by scanning electron microscopy and energy dispersive x-ray spectrometry using a universal testing machine and magnified 35 times. No structural changes were detected on morphological surface characterization, only substrate accumulation. As for composition, there were concentration differences in the titanium, oxygen, and carbon elements. Implants with surface acid treatment undergo greater superficial changes in chemical composition than machined implants, that is, the greater the contact area of the implant with the substrate, the greater the oxide layer change. In addition, prior manipulation can alter the chemical composition of implants, typically to a greater degree in surface-treated implants.
authors: 1  School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
authors: Mariana
authors: M
authors: Lima da Costa Valente
authors: Antonio Carlos
authors: AC
authors: Shimano
authors: Elcio
authors: E
authors: Marcantonio Junior
authors: Andréa Candido Dos
authors: AC
authors: Reis
mesh_terms: D000134:Acid Etching, Dental; D018786:Bone Substitutes / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D045662:Dental Etching; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D016062:Porosity; D013052:Spectrometry, X-Ray Emission; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D019415:Torque
chemical_list: D018786:Bone Substitutes; D015921:Dental Implants; D003764:Dental Materials; D010087:Oxides; D011140:Polyurethanes; D002244:Carbon; D014025:Titanium; D010100:Oxygen
keywords: dental Implant; osseointegration; scanning electron microscopy; topography; traction