Effect of the cavity configuration factor on the marginal microleakage of esthetic restorative materials.
OBJECTIVE
To evaluate the effect of the cavity configuration factor (CF) on the marginal microleakage of cervical restorations with four aesthetic restorative materials.


METHODS
Conventional cavities, 2.9 mm in diameter and 1.5 mm deep, with CF=2.7 and "saucer"-shaped ones with CF=2 were created in 60 extracted premolars. The following groups were established: G1: Z100/Single Bond, G2: Freedom/Stae, G3: Vitremer/Primer and G4: Durafill/Durafill Bond, following each manufacturer's directions. Thermocycling of the specimens was performed in an aqueous solution of 2% buffered methylene blue, with the temperature varying between 5 to 55 degrees C, for a total of cycles of 60 minutes per day, for 7 days. The specimens were then sectioned and evaluated by two observers using photographs acquired from a stereomicroscope. The values were subjected to Kruskal-Wallis analysis and the Dunn and Wilcoxon test.


RESULTS
The averages of the microleakage scores observed in the conventional and "saucer"-shaped cavities were respectively: G1: 0.66/0.46; G2: 0.92/0.69; G3: 1.8/1.86; G4: 3.54/2.3.
Franco
Eduardo Batista
EB
Department of Operative Dentistry, Bauru Dental School, University of São Paulo, Brazil. ebfranco@usp.br
Gonzaga Lopes
Lawrence
L
Lia Mondelli
Rafael Francisco
RF
da Silva e Souza
Mário Honorato
MH
Pereira Lauris
José Roberto
JR
D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D004396:Coloring Agents; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003737:Dental Cavity Preparation / Q000145:classification*; D003763:Dental Leakage / Q000145:classification*; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004955:Esthetics, Dental; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008751:Methylene Blue; D015588:Observer Variation; D019279:Resin Cements / Q000737:chemistry; D012822:Silicon Dioxide; D018709:Statistics, Nonparametric; D013499:Surface Properties; D019237:Tooth Cervix / Q000473:pathology; D015040:Zirconium
D004396:Coloring Agents; D020770:Compomers; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C477332:Freedom Compomer; D005899:Glass Ionomer Cements; D019279:Resin Cements; C403634:Stae bonding agent; C084550:Vitremer; C083568:Z100 composite resin; C470435:durafill bond; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; C039734:Durafill; D015040:Zirconium; D008751:Methylene Blue