title: Amalgam repair: evaluation of bond strength and microleakage.
abstract: This study evaluated the tensile bond strength of "repaired" amalgams and compared the degree of microleakage. Amalgam (Cavex avalloy) was condensed into plastic tubes (3 mm in diameter, 10 mm in height) to the half-length. After storage in water at 37 degrees C for two days, the remaining parts of tubes were filled with amalgam (A), cavity varnish (CV)+A, Liner Bond 2V (LB2V)+A, 3M Opal Luting Cement (3MOLC)+A, Panavia F(PF)+A, Metabond(MB)+A, Fuji BondLC(FB)+A, HytacOSB(HOSB)+Hytac Aplitip (H), Liner Bond2V+Clearfil AP-X(CAP). The bond strengths for 15 samples of each restoration group were determined. For the microleakage study, MOD cavities of 90 extracted human premolars were used. The distal half of cavities were filled with amalgam. After storage in water at 37 degrees C for two days, the mesial half of the cavities were filled to simulate a clinical repair. The "repair" was placed using the procedures applied in the bond strength study. The teeth were stained with basic fuchsine (0.5%), sectioned and evaluated for dye penetration. In both parts of study, the data were analyzed by ANOVA and Duncan's multiple range tests. Bond strength values (MPa) were: A+PF+A 3.84+/-1.08, A+LB2V+A 3.15+/-0.97, A+LB2V+CAP 3.05+/-0.53, A+MB+A 2.86+/-0.88, A+HOSB+H 2.58+/-0.51, A+3MOLC+A 2.11+/-0.75, A+FB+A 0.68+/-0.59. The repaired A+A and A+CV+A groups were separated before testing. The A+PF+A group showed the highest bond strength (p<0.05). Microleakage in the cervical margins of repaired restorations was lower in the amalgam groups than microleakage in the resin composite and compomer groups. PF, MB, 3MOLC and FB performed better at the amalgam "repair" interface. The A+LB2V+A group showed no microleakage at both the occlusal and gingival test regions.
authors.affiliation: Selcuk University, Faculty of Dentistry, Department of Operative Dentistry, Konya, Turkiye.
authors.forename: F
authors.initials: F
authors.lastname: Ozer
authors.forename: N
authors.initials: N
authors.lastname: Unlü
authors.forename: B
authors.initials: B
authors.lastname: Oztürk
authors.forename: A
authors.initials: A
authors.lastname: Sengun
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D001896:Boron Compounds / Q000737:chemistry; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry*; D001840:Dental Bonding; D003736:Dental Cavity Lining; D003738:Dental Cements / Q000737:chemistry; D003763:Dental Leakage / Q000145:classification*; D017269:Dental Prosthesis Repair; D003793:Dental Restoration, Permanent; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012394:Rosaniline Dyes; D013223:Statistics as Topic; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D001896:Boron Compounds; C112828:Clearfil AP-X; D020770:Compomers; D003188:Composite Resins; D003722:Dental Alloys; D003738:Dental Cements; D005899:Glass Ionomer Cements; D008689:Methacrylates; D008768:Methylmethacrylates; C438843:Panavia-Fluoro; D019279:Resin Cements; D012394:Rosaniline Dyes; C105429:hytac; D014867:Water; C084541:Fuji glass-ionomer lining cement; C025485:basic fuchsin; D003723:Dental Amalgam; C049495:Super-bond