Low temperature polytetrafluoroethylene (PTFE) coating improves the appearance of orthodontic wires without changing their mechanical properties.

A strong esthetic demand exists for white-colored rather than metallic-colored dental appliances. Polytetrafluoroethylene (PTFE), which is chemically stable with extremely low friction, is a suitable white-colored coating for dental appliances. In the conventional PTFE coating process, base materials are heated to approximately 400°C, which could change their mechanical properties. Examination of the PTFE-coating of stainless steel, nickel titanium (Ni-Ti), and β-titanium (Ti-Mo and Ti-Nb) revealed that the conventional 380°C coating, but not the newly developed low temperature coating at 200°C, reduced elasticity and bendability, and changed the crystal structure, especially in Ni-Ti and Ti-Nb wires. PTFE-coating at 200°C resulted in less discoloration, microbial adhesion, and friction against brackets, and higher tolerance of wear than did the conventional 380°C coating. These results suggest that low temperature PTFE coating is an excellent method for improving the metallic appearance of orthodontic wires without changing their mechanical properties.

[1]  T. Kameda,et al.  Effects of magnetic fields from electric toothbrushes on fluoride- and oral bacteria-induced corrosion of orthodontic metallic wires. , 2019, Dental materials journal.

[2]  J. A. Francis,et al.  Titanium , 2019, Materials Science and Technology.

[3]  T. Kameda,et al.  Polytetrafluoroethylene (PTFE): A resin material for possible use in dental prostheses and devices. , 2019, Dental materials journal.

[4]  Esthetic orthodontic appliances – A review , 2018, Annals of Geriatric Education and Medical Sciences.

[5]  Y. Asai,et al.  Thermal conductance of Teflon and Polyethylene: Insight from an atomistic, single-molecule level , 2017, Scientific Reports.

[6]  K. Shimizu,et al.  Preparation of a Super Hydrophilic Polytetrafluoroethylene Surface Using a Gaseous Ammonia-Water Low-Temperature Plasma , 2015 .

[7]  J. Carbonell,et al.  High-density polytetrafluoroethylene membranes in guided bone and tissue regeneration procedures: a literature review. , 2014, International journal of oral and maxillofacial surgery.

[8]  Di Zhang,et al.  Effect of Aging Treatment on Microstructure and Mechanical Properties of Ti27Nb2Ta3Zr β Titanium Alloy for Implant Applications , 2014 .

[9]  N. Takahashi,et al.  A high-sensitive and non-radioisotopic fluorescence dye method for evaluating bacterial adhesion to denture materials. , 2013, Dental materials journal.

[10]  Y. Kanda,et al.  Investigation of the freely available easy-to-use software ‘EZR' for medical statistics , 2012, Bone Marrow Transplantation.

[11]  J. Naoum,et al.  Bypass surgery in limb salvage: polytetrafluoroethylene prosthetic bypass. , 2012, Methodist DeBakey cardiovascular journal.

[12]  S. Prasad,et al.  Solid lubricants: a review , 2012, Journal of Materials Science.

[13]  John M. Powers,et al.  Craig's Restorative Dental Materials , 2012 .

[14]  Young-Kyun Kim,et al.  Guided bone regeneration using two types of non-resorbable barrier membranes , 2010 .

[15]  Brian M. Smith,et al.  Using a dense PTFE membrane without primary closure to achieve bone and tissue regeneration. , 2007, Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons.

[16]  T. Kameda.  Material characteristic study of orthodontic beta-titan wires for multibracket systems , 2007 .

[17]  Guy Willems,et al.  In-vitro evaluation of the material characteristics of stainless steel and beta-titanium orthodontic wires. , 2006, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[18]  T. Ogawa,et al.  Hydrogen absorption of titanium and nickel-titanium alloys during long-term immersion in neutral fluoride solution. , 2006, Journal of biomedical materials research. Part B, Applied biomaterials.

[19]  K. Kula,et al.  Effect of fluoride prophylactic agents on the mechanical properties of nickel-titanium-based orthodontic wires. , 2005, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[20]  M. Notomi,et al.  Crystallograply of Ni-Ti Shape Memory Alloy by X-Ray Diffraction and Diffraction Pattern Simulation , 2005 .

[21]  F. Dalard,et al.  Influence of fluoride content and pH on the corrosion resistance of titanium and its alloys. , 2002, Biomaterials.

[22]  John Emsley,et al.  Nature's building blocks : an A-Z guide to the elements , 2001 .

[23]  Harry H. Binder.  Encyclopedia of the Chemical Elements , 1999 .

[24]  Bartee Bk.  Evaluation of a new polytetrafluoroethylene guided tissue regeneration membrane in healing extraction sites. , 1998 .

[25]  B. Bartee.  Evaluation of a new polytetrafluoroethylene guided tissue regeneration membrane in healing extraction sites. , 1998, Compendium of continuing education in dentistry.

[26]  B. Bartee,et al.  THE USE OF HIGH‐DENSITY POLYTETRAFLUOROETHYLENE MEMBRANE TO TREAT OSSEOUS DEFECTS: CLINICAL REPORTS , 1995, Implant dentistry.

[27]  R. Triplett,et al.  The use of guided tissue regeneration to improve implant osseointegration. , 1994, Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons.

[28]  S. K. Biswas,et al.  Friction and wear of PTFE — a review , 1992 .

[29]  Y. Okamoto,et al.  Firing Behavior of Titanium and Titanium Alloy. , 1991 .

[30]  R. G. Craig.  Restorative dental materials , 1971 .