BIOMAT Database Logo BIOMAT Database Logo

Influence of a bleaching agent on surface and mechanical properties of orthodontic thermoplastic retainer materials : An in vitro study. 2022

Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Orthodontic Research Center, School of Dentistry, Shiraz University of Medical Sciences, Qom Abad Blv, Ghasrodasht AV, Shiraz, Iran.

OBJECTIVE To investigate the effect of a tooth whitening agent on surface roughness, surface hardness, and force delivery properties of polyethylene terephthalate glycol (PETG) thermoplastic retainer materials of two different thicknesses. METHODS PETG sheets (1 mm and 1.5 mm) were thermoformed over a 30 × 60 × 10 mm3 rectangular stone model. Surface hardness, surface roughness, and results of a three-point bending test were evaluated before and after treatment (5 h daily for 14 days) with a 15% carbamide peroxide home bleaching agent. Data were analyzed using an independent sample t‑test. RESULTS Exposure of PETG specimens to the bleaching agent for 14 days significantly reduced surface hardness and increased surface roughness of samples of both thicknesses. The magnitude of force at different deflection points decreased significantly in the 1.5 mm thickness specimens treated with the bleaching agent, but no significant change was observed in the specimens with 1 mm thickness. CONCLUSIONS Use of a home bleaching agent could have adverse effects on surface roughness and hardness of PETG materials leading to reduced survival time of thermoplastic orthodontic retainers.

UI MeSH Term Description Entries
D010545 Peroxides A group of compounds that contain a bivalent O-O group, i.e., the oxygen atoms are univalent. They can either be inorganic or organic in nature. Such compounds release atomic (nascent) oxygen readily. Thus they are strong oxidizing agents and fire hazards when in contact with combustible materials, especially under high-temperature conditions. The chief industrial uses of peroxides are as oxidizing agents, bleaching agents, and initiators of polymerization. (From Hawley's Condensed Chemical Dictionary, 11th ed) Peroxide
D006244 Hardness The mechanical property of material that determines its resistance to force. HARDNESS TESTS measure this property. Hardnesses
D013499 Surface Properties Characteristics or attributes of the outer boundaries of objects, including molecules. Properties, Surface,Property, Surface,Surface Property
D014508 Urea A compound formed in the liver from ammonia produced by the deamination of amino acids. It is the principal end product of protein catabolism and constitutes about one half of the total urinary solids. Basodexan,Carbamide,Carmol
D057886 Bleaching Agents Chemicals that are used to oxidize pigments and thus effect whitening. Bleaching Agent,Whitening Agent,Whitening Agents,Agent, Bleaching,Agent, Whitening,Agents, Bleaching,Agents, Whitening
D018704 Orthodontic Retainers Orthodontic appliances, fixed or removable, used to maintain teeth in corrected positions during the period of functional adaptation following corrective treatment. These appliances are also used to maintain the positions of the teeth and jaws gained by orthodontic procedures. (From Zwemer, Boucher's Clinical Dental Terminology, 4th ed, p263) Retainers, Orthodontic,Orthodontic Retainer,Retainer, Orthodontic

Related Publications

Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Evaluation of Mechanical Properties of Different Thermoplastic Orthodontic Retainer Materials after Thermoforming and Thermocycling.
March 2023, Polymers,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
The essential work of fracture of thermoplastic orthodontic retainer materials.
May 2010, The Angle orthodontist,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Effects of various cleaning agents on polypropylene and copolyester thermoplastic orthodontic retainer materials.
October 2022, Journal of Taibah University Medical Sciences,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
In vitro determination of the mechanical and chemical properties of a fibre orthodontic retainer.
December 2012, European journal of orthodontics,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Glass Fiber Reinforced Composite Orthodontic Retainer: In Vitro Effect of Tooth Brushing on the Surface Wear and Mechanical Properties.
February 2020, Materials (Basel, Switzerland),
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
[Mechanical properties of thermoplastic materials].
September 2010, Zhonghua yi xue za zhi,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Force delivery properties of thermoplastic orthodontic materials.
February 2008, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Chemical and mechanical characteristics of contemporary thermoplastic orthodontic materials.
November 2015, Australian orthodontic journal,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners.
September 2018, Korean journal of orthodontics,
Neda Babanouri, and Nazanin Ahmadi, and Hamid Reza Pakshir, and Shabnam Ajami, and Raha Habibagahi
Mechanical properties of a new thermoplastic polymer orthodontic archwire.
September 2014, Materials science & engineering. C, Materials for biological applications,
Copied contents to your clipboard!