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The essential work of fracture of thermoplastic orthodontic retainer materials. 2010

Albert L Pascual, and Cynthia S Beeman, and E Preston Hicks, and Heather M Bush, and Richard J Mitchell
Department of Orthodontics, University of Kentucky, Lexington, 40536-0297, USA.

OBJECTIVE To investigate whether oral cleansing agents affect the essential work of fracture (EWF) and plastic work of fracture (PWF) for two types of orthodontic thermoplastic retainer materials. METHODS Polyethylene-terephthalate-glycol (PETG; Tru-Tain Splint) and polypropylene/ethylene-propylene rubber (PP-EPR) blend (Essix-C+) sheets were compared. For each material, six sets of 25 sheets were thermoformed into double-edge-notched-tension specimens; subsets of five specimens were formed with internotch distances (L) equal to 6, 8, 10, 12, or 14 mm, respectively. Sets were stored (160 hours, 25 degrees C) in air (DRY), distilled water (DW), Original Listerine (LIS), mint Crest ProHealth (CPH), 3% hydrogen peroxide (HP), or Polident solution (POL). Specimens were fractured in tension at 2.54 mm/min. Areas under load-elongation curves were measured to determine total work of fracture (W(f)). Linear regressions (W(f) vs L [n = 25]) yielded intercepts (EWF) and slopes (PWF). Ninety-five percent confidence intervals were used to evaluate differences in EWF and PWF estimates. RESULTS PP-EPR blends showed higher EWFs after storage in HP vs storage in DW. PP-EPR blend showed higher EWFs after storage in CPH vs PETG. After HP storage, PP-EPR exhibited lower PWFs than with any other storage conditions. PP-EPR exhibited higher PWFs than PETG after storage in DRY, DW, and LIS. CONCLUSIONS Compared with DW, none of the cleansers decreased the energy to initiate fracture. With one exception, no cleanser decreased the energy to continue plastic fracture extension. In PP-EPR blend, increased resistance to fracture initiation was observed with CPH and HP, yet, surprisingly, HP decreased resistance to plastic fracture growth.

UI MeSH Term Description Entries
D008422 Materials Testing The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility. Biocompatibility Testing,Biocompatible Materials Testing,Hemocompatibility Testing,Testing, Biocompatible Materials,Testing, Hemocompatible Materials,Hemocompatibility Testings,Hemocompatible Materials Testing,Materials Testing, Biocompatible,Materials Testing, Hemocompatible,Testing, Biocompatibility,Testing, Hemocompatibility,Testing, Materials,Testings, Biocompatibility
D009067 Mouthwashes Solutions for rinsing the mouth, possessing cleansing, germicidal, or palliative properties. (From Boucher's Clinical Dental Terminology, 4th ed) Mouth Bath,Mouth Rinse,Mouth Wash,Bath, Mouth,Baths, Mouth,Mouth Baths,Mouth Rinses,Rinse, Mouth,Rinses, Mouth,Wash, Mouth
D010969 Plastics Polymeric materials (usually organic) of large molecular weight which can be shaped by flow. Plastic usually refers to the final product with fillers, plasticizers, pigments, and stabilizers included (versus the resin, the homogeneous polymeric starting material). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Plastic
D011092 Polyethylene Glycols Polymers of ETHYLENE OXIDE and water, and their ethers. They vary in consistency from liquid to solid depending on the molecular weight indicated by a number following the name. They are used as SURFACTANTS, dispersing agents, solvents, ointment and suppository bases, vehicles, and tablet excipients. Some specific groups are NONOXYNOLS, OCTOXYNOLS, and POLOXAMERS. Macrogols,Polyoxyethylenes,Carbowax,Macrogol,Polyethylene Glycol,Polyethylene Oxide,Polyethyleneoxide,Polyglycol,Glycol, Polyethylene,Glycols, Polyethylene,Oxide, Polyethylene,Oxides, Polyethylene,Polyethylene Oxides,Polyethyleneoxides,Polyglycols,Polyoxyethylene
D011093 Polyethylene Terephthalates Polyester polymers formed from terephthalic acid or its esters and ethylene glycol. They can be formed into tapes, films or pulled into fibers that are pressed into meshes or woven into fabrics. Dacron,Nalophan,PET Polymer,Poly(Ethylene Terephtalate),Polyethylene Terephthalate,Tedlar,Dacrons,Nalophans,PET Polymers,Tedlars,Terephthalate, Polyethylene,Terephthalates, Polyethylene
D011095 Polyethylenes Synthetic thermoplastics that are tough, flexible, inert, and resistant to chemicals and electrical current. They are often used as biocompatible materials for prostheses and implants. Ethylene Polymers,Ethene Homopolymers,Homopolymers, Ethene,Polymers, Ethylene
D011126 Polypropylenes Propylene or propene polymers. Thermoplastics that can be extruded into fibers, films or solid forms. They are used as a copolymer in plastics, especially polyethylene. The fibers are used for fabrics, filters and surgical sutures. Propene Polymers,Propylene Polymers,Hostalen,Marlex,Marlex Polypropylene,Polypro,Polypropylene,Prolene,Polymers, Propene,Polymers, Propylene,Polypropylene, Marlex
D001881 Borates Inorganic or organic salts and esters of boric acid. Borate
D002594 Cetylpyridinium Cationic bactericidal surfactant used as a topical antiseptic for skin, wounds, mucous membranes, instruments, etc.; and also as a component in mouthwash and lozenges. Angifonil,Biosept,Catamium,Ceepryn Chloride,Cetamium,Cetylpyridinium Chloride,Cetylpyridinium Chloride Anhydrous,Cetylpyridium,Cetylyre,Dobendan,Hexadecylpyridinium,Merocets,Pristacin,Pyrisept,Sterogenol,Anhydrous, Cetylpyridinium Chloride,Chloride Anhydrous, Cetylpyridinium,Chloride, Ceepryn,Chloride, Cetylpyridinium
D003764 Dental Materials Materials used in the production of dental bases, restorations, impressions, prostheses, etc. Dental Material,Material, Dental,Materials, Dental

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