In-vitro comparison of bonding time and strength of adhesive pre-coated and standard metal orthodontic brackets




Debonding, non-fluoridated pumice


To compare the shear bond strength and bond time of 3M Unitek's APC (Adehesive Pre-Coated) Flash-Free™system applied to metal brackets. An in vitro study was performed on 40 extracted sound human premolar teeth randomly divided into two groups
(20 per group) bonded either with Adhesive Pre-Coated Flash-Free metal brackets or metal brackets coated manually with Transbond XT™ light-cure adhesive. Bonding time was measured using a stopwatch. Thermoycling was performed on the samples (500 cycles)
to simulate the oral environment between baths of 5°C and 55°C distilled water. Debonding shear bond strength measurements were performed in an Instron universal testing machine. The APC Flash-Free group bonded in significantly (p<0.001) less time (mean 34.06s/tooth) than the manually coated group (mean 55.14s/tooth). Shear bond strength of the manually coated group was significantly (p<0.001) higher (mean 13.32 MPa) than the APC Flash-Free group (mean 10.95 MPa). The APC Flash-Free free system is efficient and allows for reduced chair time during the bonding appointment while attaining a mean shear bond strength of 10.95MPa,
which is higher than the minimum shear bond strength of between 4MPa and 7MPa1


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Author Biography

Emad Ghabrial, Senior Lecturer, Department of Orthodontics, University of Pretoria


Reynolds IR. A Review of Direct Orthodontic Bonding. Br J Orthod. 1975;2(3):171-8.

Buonocore MG. A simple method of increasing the adhesion of acrylic filling materials to enamel surfaces. J Dent Res. 1955;34(6):849-53.

Anusavice KJ, Phillips RW, Shen C, Rawls HR. Phillips' science of dental materials. St. Louis, Mo.: Saunders; 2013.

Green JIJ. The origins and evolution of fixed orthodontic appliances. J Dent Nurs. 2014;10:524-8.

Ewoldsen N, Demke RS. A review of orthodontic cements and adhesives. Am J Orthod Dentofacial Orthop. 2001;120(1):45-8.

Lee M, Kanavakis G. Comparison of shear bond strength and bonding time of a novel flash-free bonding system. Angle Orthod. 2016;86(2):265-70.

Grünheid T, Sudit GN, Larson BE. Debonding and adhesive remnant cleanup: an in vitro comparison of bond quality, adhesive remnant cleanup, and orthodontic acceptance of a flash-free product. Eur J Orthod. 2015;37(5):497-502.

Kim J, Kanavakis G, Finkelman MD, Lee M. Microleakage under ceramic flash-free orthodontic brackets after thermal cycling. Angle Orthod.


Foersch M, Schuster C, Rahimi RK, Wehrbein H, Jacobs C. A new flash-free orthodontic adhesive system: A first clinical and stereomicroscopic

study. Angle Orthod. 2016;86(2):260-4.

Gwinnett AJ, Ceen RF. Plaque distribution on bonded brackets: a scanning microscope study. Am J Orthod Dentofacial Orthop. 1979;75(6):667-77.

Ho CS, Ming Y, Foong KW, Rosa V, Thuyen T, Seneviratne CJ. Streptococcus mutans forms xylitol-resistant biofilm on excess adhesive flash

in novel ex-vivo orthodontic bracket model. Am J Orthod Dentofacial Orthop. 2017;151(4):669-77.

Mei L, Busscher HJ, van der Mei HC, Ren Y. Influence of surface roughness on streptococcal adhesion forces to composite resins. Dent Mater J. 2011;27(8):770-8.

Årtun J, Brobakken BO. Prevalence of carious white spots after orthodontic treatment with multibonded appliances. Eur J Orthod. 1986;8(4):229-34.

Rosenbloom RG, Tinanoff N. Salivary Streptococcus mutans levels in patients before, during, and after orthodontic treatment. Am J

Orthod Dentofacial Orthop. 1991;100(1):35-7.

Cinader DK, Aung M, Ugai R, Conley A. APC™ Flash-free adhesive: a technical overview. Orthodontic Perspectives. 2013;20(1):7-9.

Grunheid T, Sudit GN, Larson BE. Debonding and adhesive remnant cleanup: an in vitro comparison of bond quality, adhesive remnant cleanup, and orthodontic acceptance of a flash-free product. Eur J Orthod. 2015;37(5):497-502.

Grünheid T, Larson BE. Comparative assessment of bonding time and 1-year bracket survival using flash-free and conventional adhesives

for orthodontic bracket bonding: A split-mouth randomized controlled clinical trial. Am J Orthod Dentofacial Orthop. 2018;154(5):621-8.

Faltermeier A, Rosentritt M, Faltermeier R, Reicheneder C, Müßig D. Influence of filler level on the bond strength of orthodontic adhesives. Angle Orthod. 2007;77(3):494-8.

Bishara SE, Gordan VV, VonWald L, Jakobsen JR. Shear bond strength of composite, glass ionomer, and acidic primer adhesive systems. Am J Orthod Dentofacial Orthop. 1999;115(1):24-8.

Bishara SE, VonWald L, Laffoon JF, Warren JJ. Effect of a self-etch primer/adhesive on the shear bond strength of orthodontic brackets. Am J Orthod Dentofacial Orthop. 2001;119(6):621-4.

Bishara SE, Olsen ME, Jakobsen JR. Evaluation of a new light-cured orthodontic bonding adhesive. Am J Orthod Dentofacial Orthop. 1998;114(1):80-7.

Toledano M, Osorio R, Osorio E, Romeo A, de la Higuera B, Garcia-Godoy F. Bond strength of orthodontic brackets using different light and selfcuring cements. Angle Orthod. 2003;73(1):56-63.

Aydin B, Pamir T, Baltaci A, Orman MN, Turk T. Effect of storage solutions on microhardness of crown enamel and dentin. Eur J Dent. 2015;9(2):262-6.Figure 2: Comparison of shear bond strength.590 > RESEARCH / SADJ Vol. 77 No. 10

Hirani S, Sherriff M. Bonding characteristics of a self-etching primer and precoated brackets: an in vitro study. Eur J Orthod. 2006;28(4):400-4.

Oliver B, Dama M. A retrospective six-months clinical trial of adhesive precoated brackets and bonding system. J Can Dent Assoc.

;63(2):101-3, 7.

Nelsen RJ, Paffenbarger GC, Wolcott RB. Fluid exchange at the margins of dental restorations. JADA. 1952;44(3):288-95.

Gale MS, Darvell BW. Thermal cycling procedures for laboratory testing of dental restorations. J Dent 1999;27(2):89-99.

Summers A, Kao E, Gilmore J, Gunel E, Ngan P. Comparison of bond strength between a conventional resin adhesive and a resin-modified

glass ionomer adhesive: an in vitro and in vivo study. Am J Orthod Dentofacial Orthop. 2004;126(2):200-6.

Rix D, Foley TF, Mamandras A. Comparison of bond strength of three adhesives: composite resin, hybrid GIC, and glass-filled GIC. Am J Orthod Dentofacial Orthop. 2001;119(1):36-42.

Bishara SE, Ostby AW, Laffoon JF, Warren J. Shear bond strength comparison of two adhesive systems following thermocycling: a new self-etch primer and a resin-modified glass ionomer. Angle Orthod. 2007;77(2):337-41.

Bishara SE, Oonsombat C, Soliman MM, Warren JJ, Laffoon JF, Ajlouni R. Comparison of bonding time and shear bond strength between

a conventional and a new integrated bonding system. Angle Orthod. 2005;75(2):237-42.

Alakttash AM, Fawzi M, Bearn D. Adhesive precoated bracket systems and operator coated bracket systems: Is there any difference? A

systematic review and meta-analysis. Angle Orthod. 2019;89(3):495-504.

Reddy YG, Sharma R, Singh A, Agrawal V, Chaturvedi S. The Shear Bond Strengths of Metal and Ceramic Brackets: An in-Vitro Comparative

Study. JCDR. 2013;7(7):1495-7.

Uysal T, Ustdal A, Kurt G. Evaluation of shear bond strength of metallic and ceramic brackets bonded to enamel prepared with self-etching primer. Eur J Orthod. 2009;32(2):214-8.




How to Cite

Essop, R., Ghabrial, E., & Becker, P. J. (2022). In-vitro comparison of bonding time and strength of adhesive pre-coated and standard metal orthodontic brackets. South African Dental Journal, 77(10), 587–591.