title: An in vitro study of the effect of restorative technique on marginal leakage in posterior composites.
abstract: The purpose of this in vitro study was to compare marginal leakage of class 2 light-cured composite resin restorations, with different insertion and polymerization techniques. Fifty sound premolars extracted for prosthetic purposes were used in the study. Conservative class 2 (MOD) preparations were made in all teeth, with one proximogingival margin on enamel and the other on cementum. All the preparations and restorations were performed by the same operator utilizing the same restorative materials. After restoration the teeth were thermocycled and their gingival margins exposed to a dye. Results showed that the kind of matrix system had no significant influence upon the degree of marginal leakage on enamel. On cementum, oblique and horizontal incremental insertion and polymerization techniques using the collimator cone exhibited the least leakage, while the clear matrix band/reflective wedge technique presented the greatest leakage.
authors.affiliation: Federal University of Santa Catarina, School of Dentistry, Florianopolis, Brazil.
authors.forename: I F
authors.initials: IF
authors.lastname: Neiva
authors.forename: M A
authors.initials: MA
authors.lastname: de Andrada
authors.forename: L N
authors.initials: LN
authors.lastname: Baratieri
authors.forename: S
authors.initials: S
authors.lastname: Monteiro Júnior
authors.forename: A V
authors.initials: AV
authors.lastname: Ritter
mesh_terms: D001641:Bicuspid; D003188:Composite Resins; D003739:Dental Cementum; D003743:Dental Enamel; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005069:Evaluation Studies as Topic; D006801:Humans; D008963:Molar; D011108:Polymers / Q000737:chemistry; D019279:Resin Cements; D012822:Silicon Dioxide; D018709:Statistics, Nonparametric; D015040:Zirconium
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011108:Polymers; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium