Influence of Different Disinfectants on Surface Hardness of Heat-Polymerized Acrylic Resins utilized for Orthodontic Appliance
Heat-polymerized resins are common substances utilized for construction of removable dental prostheses (i.e. Orthodontic appliances). Such materials should have appropriate physical properties. The use of disinfectant solutions might influence the physical characteristics of the acrylic materials. This study was conducted to assess the influence of different disinfectants on heat polymerized resins in terms of surface hardness. Forty specimens were made from heat-polymerized acrylic resins in total. The investigation comprised 4 groups according to the disinfectants utilized and each group had ten specimens. The 1st group was immersed in distilled water (control); the 2nd group was disinfected in Efferdent; the 3rd group was disinfected in 4 % Chlorhexidine; and the 4th group was disinfected in 1% hypochlorite. All specimens were tested via a hardness tester three times and the average reading was measured for all specimens. The statistical results indicated a slight decline in the mean values of surface hardness of acrylic specimens following immersion in disinfectants. The greatest value of mean was for distilled water specimens whereas the lowest value of mean was for 4% Chlorhexidine specimens. Furthermore, no significant differences were found among all groups (P>0.05). The study concluded that the use of disinfectants solutions slightly decreases the hardness of heat polymerized resins. It is recommended to evaluate the chemical interaction between the acrylic resins and disinfectants.
RL. Sakaguchi, JM Powers, "Craig’s restorative dental materials" .US Mosby, pp. 163-176, 192-94, 2012.
G. Zarb, J. Hobkirk, S. Eckert, R. Jacob, "Prosthodontic Treatment for Edentulous Patients: Complete Dentures and Implant-Supported Prostheses". 13th ed. US: Mosby; pp:135, 2013
M. Saleh, MY. Hajeer, D. Muessig, "Acceptability Comparison between Hawley Retainers and Vacuum- Formed Retainers in Orthodontic Adult Patients: A Single- Centre, Randomized Controlled Trial". Eur J Orthod, Vol.39, No.4, pp. 453-46, Aug. 2017.
SJ. Littlewood , DT. Millett, B. Doubleday, DR. Bearn, HV. Worthington "Retention Procedures for Stabilising Tooth Position after Treatment with Orthodontic Braces". Cochrane Database Syst Rev, Vol.29, No.1, pp: CD002283, Jan 2016.
IA. Orsi , VG. Andrade, "Effect of chemical disinfectants on the transverse strength of heat-polymerized acrylic resins submitted to mechanical and chemical polishing". J Prosthet Dent, Vol. 92, No. 1, pp: 382-388, Oct 2004.
AC. Salvia, Fdos S. Matilde, FC. Rosa, ET. Kimpara, AO. Jorge, I. Balducci , "Disinfection protocols to prevent cross contamination between dental offices and prosthetic laboratories". J Infect Public Health, Vol.6, No.5, pp:377-82, Oct 2013.
GL. Polyzois , AJ. Zissis, SA. Yannikakis, "The effect of glutaraldehyde and microwave disinfection on some properties of acrylic denture resin". Int J Prosthodont, Vol.8, No.2, pp:150-4, Mar-Apr1995.
Infection control recommendations for the dental office and the dental laboratory. ADA Council on Scientific Affairs and ADA Council on Dental Practice. J Am Dent Assoc. 1996 May;127(5):672-80. https://pubmed.ncbi.nlm.nih.gov/8642147/
S. Sharan , H R Kavitha, Harish Konde, D Kalahasti, " Effect of chemical disinfectant on the transverse strength of heat-polymerized acrylic resins subjected to mechanical and chemical polishing: an in vitro study". J Contemp Dent Pract., Vol.13, No.3, pp.:389-93, May2012.
NH. Campanha , AC. Pavarina, CE. Vergani, AL Machado, "Effect of microwave sterilization and water storage on the Vickers hardness of acrylic resin denture teeth". J Prosthet Dent, Vol.93, No.5, pp:483-7, May 2005.
S. Pavan, JN Arioli, PH Dos Santos, F Assis. Mollo, " Effect of microwave treatments on dimensional accuracy of maxillary acrylic resin denture base”, Braz Dent J, Vol.16, No.2, pp:119-23, May/Aug 2005.
AC. Pavarina , AC. Pizzolitto, AL. Machado, CE. Vergani, ET. Giampaolo, "An infection control protocol: effectiveness of immersion solutions to reduce the microbial growth on dental prostheses". J Oral Rehabil. 2003 May;30(5):532-6.
AC. Pavarina , CE. Vergani, AL. Machado, ET. Giampaolo, MT. Teraoka," Effects of disinfectants solutions on the hardness of acrylic resin denture teeth". J Oral Rehabil, Vol.30, No. 1, pp: 749-752, Jul 2003.
AC. Pavarina , AL. Machado, ET. Giampaolo, CE. Vergani , "Effects of chemical disinfectants on the transverse strength of denture base acrylic resins". J Oral Rehabil, Vol.30, No.11, pp:30:1085-9, Nov 2003.
J. de Ol. Zoccolotti , C. O. Tasso , M. I. A. Arbeláez , I. F. Malavolta , E. C. da S. Pereira , C. S. G. Esteves , J. H. Jorge, "Properties of an Acrylic Resin after Immersion in Antiseptic Soaps: Low-Cost, Easy-Access Procedure for the Prevention of Denture Stomatitis", PLoS ONE 2018,Vol.13,No. 8, Aug 2018.
O. Savabi , K. Attar, F. Nejatidanesh, H. Goroohi, H. Badrian, "Effect of different chemical disinfectants on the flexural strength of heat-polymerized acrylic resins", Eur J Prosthodont Restor Dent, Vol. 21, No.3;pp:105-8, Sep 2013.
AL. MACHADO, ET. GIAMPAOLO, CE. Vergani, JH. JORGE," Changes in roughness of denture base and reline materials by chemical disinfection or microwave irradiation: surface roughness of denture base and reline materials". J Appl Oral Sci, Vol.19, No.5, pp:521-528, Sep-Oct 2011.
M. Goiato , DM dos. Santos, A. Moreno, MG. Iyda, MC. Rezende, MF Haddad, "Effect of disinfection and storage on the flexural strength of ocular prosthetic acrylic resins". Gerodontology, Vol.29, No.2, pp: e838-844, Jun 2012.
KH. Neppelenbroek , AC. Pavarina, CE. Vergani, ET. Giampaolo," Hardness of heat-polymerized acrylic resins after disinfection and long-term water immersion". J Prosthet Dent, Vol.93, No.2, pp:171-176, Feb 2005.
American national standers institute/ American dental association specification No.12 for denture base polymer. 10th Ed.; Chicago: council on dental material and devices, 1999.
AÚ. Fernandes, A. Portugal, LR. Veloso, MC. Goiato, DM dos. Santos," Assessment of the flexural strength of two heat-curing acrylic resins for artificial eyes". Braz Oral Res, Vol.23, No.3, pp: 263–267, Jul-Sep 2009.
MC. Goiato , DM dos. Santos, H. Gennari-Filho, AC. Zavanelli, SF. Dekon, DN. Mancuso," Influence of investment, disinfection, and storage on the microhardness of ocular resins, J Prosthodont, Vol.18, No.1 pp:32–35, Jan 2009.
MC. Goiato, MF. Haddad, DM dos. Santos, AA. Pesqueira, A. Moreno, "Hardness evaluation of prosthetic silicones containing opacifiers following chemical disinfection and accelerated aging". Braz Oral Res, Vol. 10, No.3, pp: 303-8, July-Sep 2010.
A. Moreno , M. Goiato, D. Santos, M. Haddad, A. Pesqueira, L. Bannwart, " Effect of different disinfectants on the microhardness and roughness of acrylic resins for ocular prosthesis". Gerodontology, Vol.30, No.1, pp: 32-9, Mar 2013.
CF. Carvalho , AD. Vanderlei, SM. Marocho, SM. Pereira, L. Nogueira, TJ Paes-Júnior, "Effect of disinfectant solutions on a denture base acrylic resin". Acta Odontol Latinoam, Vol. 25, No.3, pp: 255-60, April 2012.