A Full Gold Crown, Cast and Readapted

Jones, Rolland R.

doi:10.14219/jada.archive.1947.0134

Cited by 1 publication

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“…14 Placing a small perforation (vent hole) in the occlusal aspect of the restoration to facilitate escape of the cement has been suggested to allow for a more complete seating of the restoration. [15][16] Several studies described a trend toward a decrease in elevation (an increase in the accuracy of the occlusion after cementation) following cementation of die-spaced crowns. [17][18][19] These observations have been attributed to a decrease in hydrolic forces within the cement film, 20 improved outflow of cement and a decrease in contact between the inner surface of the crown and the tooth.…”

Section: Introductionmentioning

confidence: 99%

Microleakage of All-ceramic Crowns Using Self-etching Resin Luting Agents

Trajtenberg¹,

Caram

Kiat-amnuay

2008

Operative Dentistry

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SUMMARYSelf-etching adhesive systems are a new generation of materials that possess acidic methacrylates that can generate self-adhesion. There is limited data reported on the marginal leakage of ceramic restorations bonded with self-etching adhesive materials. This study assessed and compared the amount of microleakage of bonded ceramic crowns using three different types of self-etching adhesive systems with and without a die spacer.Eighteen human molars were prepared for allceramic IPS Empress crowns and the teeth were randomly assigned to each experimental group. The buccal side had the preparation finish line 1.5 mm below the CEJ, and the lingual finish line was 1.5 mm above the CEJ, creating margins in enamel and dentin. Two die-spacing techniques were used (three layers or no layer of die spacer). Each crown restoration was cemented with one of three self-etching resin luting agents (Panavia F 2.0, Multilink and RelyX Unicem). The specimens were thermally cycled for 1000 cycles, then immersed in a 5% methylene blue dye solution for 24 hours. The teeth were then rinsed, embedded in clear epoxy resin and sectioned. A total of 60 sections were evaluated for each type of resin luting agent using digital image analysis at 70x magnification. A novel formula, using mean percentage of microleakage, was developed by dividing the extent of dye penetration along the tooth/resin luting cement interphase and the total perimeter of the tooth crown surface. The data were analyzed using three-way analysis of variance at the 0.05 level of significance. Fisher's PLSD intervals were calculated for comparing significant means. Panavia F 2.0 showed a lower degree of microleakage than RelyX Unicem and Multilink Clinical RelevanceAmong the self-adhesive resin cements, Panavia F 2.0 demonstrated less microleakage than RelyX Unicem or Multilink, whether or not a die spacer technique was used.at both the enamel and dentin margins. Interactions of the main effects (cement, margin and die spacer technique) were all highly significant (p≤0.004). The degree of microleakage was higher on the dentin margins than on the enamel margins (p<0.0001). The degree of microleakage for the die spacer group was not significantly different from the group with no die spacer technique (p>0.1).Overall, Panavia F 2.0 showed the least microleakage, followed by RelyX Unicem and Multilink, respectively.

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