A clinical trial to evaluate the effects of prophylactic fluoride agents on the superelastic properties of nickel-titanium wires.
OBJECTIVE
To study the effects of a prophylactic fluoride regimen on the mechanical properties of nickel-titanium (Ni-Ti) archwires under clinical conditions.


METHODS
The unloading properties of 100 Ni-Ti wires were tested using a three-point bending test at five deflections (0.5 mm, 1.0 mm, 2.0 mm. 3.0 mm, and 3.1 mm). Sixty-six 0.016 3 0.022-inch Ni-Ti wires were tested after being used intraorally for 6 weeks using two protocols. Thirty-three wires were evaluated after the use of fluoride-containing Crest toothpaste (sodium fluoride 0.243%, 0.15% w/v fluoride ion) and Equate fluoride rinse (sodium fluoride 0.05%, fluoride ion 0.0226%). Another 33 wires were examined after a nonfluoridated natural toothpaste (Tom's of Maine; calcium carbonate, xylitol, myrrh, propolis, sodium lauryl sulfate, carrageenan, spearmint and peppermint oils, glycerin, and water) was used. Another 34 Ni-Ti wires served as a control; they were tested as received. Statistical analyses were carried out with a linear-mixed model (analysis of variance [ANOVA]).


RESULTS
Force degradation occurred within both groups of intraorally used wires but not in the unused archwires. When compared to unexposed wires, those with fluoride exposure exhibited slightly higher force degradation at 3.1 and 3.0 mm deflection, but they displayed less force degradation at 0.5 and 1.0 mm deflection.


CONCLUSIONS
Topical fluoride regimens decreased the unloading property of Ni-Ti wires at higher deflections but increased it at lower deflections.
Vo
Jossette
J
School of Orthodontics, Jacksonville University, Jacksonville, Florida, USA.
Chudasama
Dipak N
DN
Rinchuse
Donald J
DJ
Day
Richard
R
D000293:Adolescent; D000328:Adult; D002119:Calcium Carbonate / Q000737:chemistry; D002327:Cariostatic Agents / Q000737:chemistry*; D002648:Child; D003722:Dental Alloys / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003802:Dentifrices / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena; D009067:Mouthwashes / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D009969:Orthodontic Wires; D018583:Pliability; D012824:Silicic Acid / Q000737:chemistry; D012969:Sodium Fluoride / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014100:Toothpastes / Q000737:chemistry; D055815:Young Adult
D002327:Cariostatic Agents; D003722:Dental Alloys; D003802:Dentifrices; D009067:Mouthwashes; D014100:Toothpastes; C546060:hydrated silica gel-based toothpaste; C040654:titanium nickelide; D012824:Silicic Acid; D009532:Nickel; D012969:Sodium Fluoride; D014025:Titanium; D002119:Calcium Carbonate; D005459:Fluorides