title: Shear Bond Strength of Repaired Composites Using Surface Treatments and Repair Materials: An In vitro Study.
abstract: BACKGROUND
  Enhancement of bond strength between new and old composite usually requires increased surface roughness of old composite to promote mechanical interlocking and subsequent coating with bonding agents to improve surface wetting and chemical bonding. So this study was carried out to evaluate and compare the effects of different surface treatments and repair materials on the shear bond strength (SBS) of composite repairs The mode of failure of repaired composites whether cohesive or adhesive was also evaluated.
  
  
  METHODS
  The substrates for 60 composite specimens were fabricated and aged with water treatment and subjected to various surface treatments. The surface treatment regimens used in the study were: No surface treatment, abraded with diamond bur, air abraded (sandblasted) with 50 µ aluminum oxide particles. Specimens were then repaired with fresh composite using either Clearfil(™) repair or all-bond two adhesive systems. Specimens were water stored, thermocycled and tested for SBS using universal testing machine. Fractured specimens were then examined under stereomicroscope to determine the mode of failure.
  
  
  RESULTS
  It was clearly showed that surface roughening of the aged composite substrate with air abrasion, followed by the application of Clearfil(™) repair adhesive system (Group IIIa) yielded the highest repair bond strength (32.3 ± 2.2 MPa).
  
  
  CONCLUSIONS
  Surface treatment with air abrasion followed by bonding with Clearfil(™) repair adhesive system can be attempted clinically for the repair of composite restorations.
authors: Reader, Department of Conservative Dentistry & Endodontics, CKS Theja Institute of Dental Sciences & Research Centre, Tirupati, Andhra Pradesh, India.
authors: M
authors: M
authors: Hemadri
authors: Reader, Department of Conservative Dentistry & Endodontics, Pullareddy Dental College, Kurnool, Andhra Pradesh, India.
authors: G
authors: G
authors: Saritha
authors: Reader, Department of Conservative Dentistry & Endodontics, CKS Theja Institute of Dental Sciences & Research Centre, Tirupati, Andhra Pradesh, India.
authors: V
authors: V
authors: Rajasekhar
authors: Reader, Department of Conservative Dentistry & Endodontics, SDM Dental College & Hospital, Dharwad, Karnataka, India.
authors: K Amit
authors: KA
authors: Pachlag
authors: Reader, Department of Conservative Dentistry & Endodontics, Sharavathi Dental College & Hospital, Shimoga, Karnataka, India.
authors: R
authors: R
authors: Purushotham
authors: Reader, Department of Pedodontics, CKS Theja Institute of Dental Sciences & Research Centre, Tirupati, Andhra Pradesh, India.
authors: Veera Kishore Kumar
authors: VK
authors: Reddy
keywords: Adhesive systems; composite resin repair; shear bond strength; surface treatments
references: Am J Dent. 2001 Dec;14(6):373-7
references: 11949797
references: Am J Dent. 2004 Apr;17(2):123-6
references: 15151340
references: J Dent Res. 1995 Sep;74(9):1591-6
references: 7560421
references: Int J Prosthodont. 2001 Jul-Aug;14(4):344-9
references: 11508090
references: Dent Mater. 1989 Nov;5(6):417-24
references: 2700978
references: J Dent Res. 1984 Oct;63(10 ):1241-4
references: 6384300
references: Oper Dent. 1991 Jul-Aug;16(4):136-40
references: 1805182
references: Oper Dent. 1987 Summer;12(3):127-31
references: 3306617
references: J Esthet Dent. 1991 Jul-Aug;3(4):139-47
references: 1817583
references: J Dent Res. 1995 Jan;74(1):381-7
references: 7876433
references: Dent Mater. 1992 Nov;8(6):362-5
references: 1303383
references: J Prosthet Dent. 1997 Feb;77(2):122-6
references: 9051597
references: Braz Oral Res. 2011 Nov-Dec;25(6):485-91
references: 22147227
references: Oper Dent. 2003 Mar-Apr;28(2):149-54
references: 12670070
references: J Conserv Dent. 2012 Oct;15(4):383-7
references: 23112489
references: J Esthet Restor Dent. 2007;19(2):90-8; discussion 99
references: 17374114
references: Clin Oral Investig. 2009 Sep;13(3):317-23
references: 18839227
references: Oper Dent. 1993 Sep-Oct;18(5):187-94
references: 8152988
references: Br Dent J. 1975 Oct 7;139(7):286-8
references: 1058000
references: J Prosthet Dent. 1989 Jun;61(6):669-75
references: 2657022
references: Oper Dent. 1996 Mar-Apr;21(2):59-62
references: 8957919
references: J Dent. 2003 Nov;31(8):521-5
references: 14554068