TY - JOUR
T1 - Marginal leakage in class V composite resin restorations with glass ionomer liners in vitro
AU - Mathis, R. S.
AU - DeWald, J. P.
AU - Moody, C. R.
AU - Ferracane, J. L.
N1 - Funding Information:
M arginal leakage around composite resin restorations, particularly at the gingival aspect, is a major problem in clinical dentistry.l Reducing marginal leakage will decreases econdaryc aries,p ulpal sensitivity, pulpal injury, and discoloration, thereby increasingt he clinical successo f the restoration.2p3 Compositer esinsa re widely usedi n clinical applications, especially where esthetics are a primary concern, for example, in class V restorations. Although there is little leakage at the occlusal aspect of class V restorations becauseo f the strength of the etched enamel/composite bond,4*5t he bond at the gingival aspect is insufficient because of the lack of enamel for adherence or inadequate prism structure in the available enamel for acceptabletag formations Therefore, to improve the clinical successo f composite resins in classV restorations, marginal leakage at the gingival aspect must be minimized. Glass ionomer cements offer improved marginal sealing ability by chemical adhesion to enamel and dentin.7-gA l-though the bond of glass ionomer cement to enamel is weaker than the bond of composite resinst o enamel,1°t he bond of glass ionomer to dentin is greater than that of compositer esin to dentin and can be further enhancedw ith the use of a 25% polyacrylic acid pretreatment.l’ Glass- Supported by funds from the 3M Foundation, St. Paul, Minnesota and G-C Dental Industrial Corporation, Tokyo, Japan. Presented at the IADR/AADR/CADR, Montreal, Canada. *Assistant Professor, Department of Operative Dentistry, Baylor College of Dentistry. **Associate Professor, Department of Dental Materials, Oregon Health Sciences University, School of Dentistry. 10/l/17711 ionomer cement has a coefficient of thermal expansion similar to natural tooth, structure and has been shown to elicit no marginal leakage5. p1 2-1H5 owever, other properties such as high solubility, low strength, poor esthetics, and surface roughness limit its use as a restorative material.16-lsT he bond of etched glassi onomer cement to composite resin is stronger than the cement itself.“* lg Therefore, it is logical to expect that glass ionomer cement would serve as an excellent dentinal bonding agent under a composite resin. In addition, becauseg lassio nomer cement has a coefficient of thermal expansion similar to tooth structure and, unlike compositer esin, doesn ot have the potential to “debond” from polymerization shrinkage, one expects better adaptation to the cavity wall. Its use also reduces the amount of composite resin needed, thus further reducing the effects of polymerization shrinkage. This study evaluated the use of glassi onomer lining cement under composite resin in class V cavities in terms of in vitro marginal sealing ability.
PY - 1990/5
Y1 - 1990/5
N2 - This in vitro study evaluated the use of a glass ionomer lining cement in conjunction with composite resin in class V preparations in terms of marginal sealing ability. Two preparations, the occlusal walls in enamel (etched) and the gingival walls in dentin, were place in each tooth. One contained the etched glass ionomer liner, a dentin bonding agent, and a microfill composite resin. The second contained the dentin bonding agent and the microfill composite resin. The teeth were thermocycled, stained with methylene blue dye, sectioned, and evaluated for leakage at the occlusal and gingival margins on a scale of 0 to 3. No significant leakage was recorded at the occlusal margin for either restoration. Leakage at the gingival margin was significantly reduced for the lined restorations, and in no instance did the dye penetrate beyond the liner, which suggests that the lining cement may significantly decrease leakage at the gingival aspect of composite resins in class V restorations.
AB - This in vitro study evaluated the use of a glass ionomer lining cement in conjunction with composite resin in class V preparations in terms of marginal sealing ability. Two preparations, the occlusal walls in enamel (etched) and the gingival walls in dentin, were place in each tooth. One contained the etched glass ionomer liner, a dentin bonding agent, and a microfill composite resin. The second contained the dentin bonding agent and the microfill composite resin. The teeth were thermocycled, stained with methylene blue dye, sectioned, and evaluated for leakage at the occlusal and gingival margins on a scale of 0 to 3. No significant leakage was recorded at the occlusal margin for either restoration. Leakage at the gingival margin was significantly reduced for the lined restorations, and in no instance did the dye penetrate beyond the liner, which suggests that the lining cement may significantly decrease leakage at the gingival aspect of composite resins in class V restorations.
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U2 - 10.1016/0022-3913(90)90068-N
DO - 10.1016/0022-3913(90)90068-N
M3 - Article
C2 - 2338665
AN - SCOPUS:0025425834
SN - 0022-3913
VL - 63
SP - 522
EP - 525
JO - The Journal of Prosthetic Dentistry
JF - The Journal of Prosthetic Dentistry
IS - 5
ER -