Microleakage of adhesive restorative materials.
OBJECTIVE
To compare the marginal sealing ability of two conventional and one polyacid-modified resin-based composite, and two conventional and three resin-modified glass-ionomers in conventional cylindrical box cavities following a silver-staining microleakage evaluation method.


METHODS
In 80 freshly extracted and caries-free human third molars, three standardized cylindrical butt-joint cavities were prepared: the first cavity in coronal enamel, the second at the cemento-enamel junction (CEJ) and the third completely in root cementum. A control group of 10 additional teeth was chosen. After the cavities were restored randomly using the eight restorative materials tested, the specimens were first stored in distilled water at 37 degrees C for 7 days and then thermocycled (500 cycles). Thereafter, the specimens were centrifuged for 10 min in plastic bottles containing 50 wt% silver nitrate aqueous solution. The degree of microleakage was recorded at four different depths along the restoration margins using an optical stereomicroscope equipped with a measuring gauge.


RESULTS
None of the tested systems prevented microleakage completely, but the extent of leakage decreased towards the bottom of the restorations. The resin-modified glass-ionomers performed better than the conventional resin-based composites and conventional glass-ionomers.


CONCLUSIONS
Distinct leakage patterns were recorded among all materials investigated.  Complete marginal sealing could still not be reached with the new adhesive restorative materials.
Gladys
S
S
BIOMAT-Department of Operative Dentistry and Dental Materials, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Belgium.
Van Meerbeek
B
B
Lambrechts
P
P
Vanherle
G
G
D000704:Analysis of Variance; D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003739:Dental Cementum / Q000648:ultrastructure; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification*; D018772:Dental Marginal Adaptation; D003775:Dental Polishing / Q000295:instrumentation; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D016622:Silver Staining; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D019237:Tooth Cervix / Q000648:ultrastructure; D014092:Tooth Root / Q000648:ultrastructure; D014867:Water
D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D019279:Resin Cements; D014867:Water