title: Microleakage at the cervical margin of composite Class II cavities with different restorative techniques.
abstract: This study evaluated the microleakage at the cervical margins of Class II composite resin restorations restored with different techniques. Slot cavities were prepared on both proximals of 40 unerupted third molars with one cervical margin located above and the other below the cementoenamel junction. The prepared teeth were randomly assigned to four groups and restored using the following techniques: (I) 3-Sited, (II) Directed-Shrinkage, (III) Resin-Modified Glass-Ionomer Cement or a (IV) Flowable Composite as the gingival increment. All restorations were placed with the same bonding agent and composite resin. The difference among the groups was on the first increment and on its insertion and polymerization techniques. After restoration, the teeth were thermocycled and exposed to a dye. Results showed that all the techniques worked well for enamel, with almost no leakage. However, on cementum, all techniques demonstrated moderate to severe leakage.
authors.forename: C
authors.initials: C
authors.lastname: Beznos
mesh_terms: D017609:Barium Compounds / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000145:classification*; D003739:Dental Cementum / Q000473:pathology; D003743:Dental Enamel / Q000473:pathology; D003763:Dental Leakage / Q000145:classification* / Q000175:diagnosis; D003775:Dental Polishing; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008964:Molar, Third; D011108:Polymers / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013816:Thermodynamics; D019237:Tooth Cervix / Q000473:pathology*; D014783:Viscosity
chemical_list: C121035:Aeliteflo; D017609:Barium Compounds; D004396:Coloring Agents; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; C119199:PermaQuik; D011108:Polymers; D019279:Resin Cements; D012117:Resins, Synthetic; C111840:flowable hybrid composite; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide