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Marginal adaptation of indirect restorations using different resin coating protocols
Alberth David Correa Medina1, Andréia Bolzan de Paula, Suzana Beatriz Portugal de Fucio
1Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - University of Campinas, Piracicaba, SP, Brazil.
Brazilian Dental Journal
|January 23, 2013
Summary
The resin coating technique (RCT) for dental restorations showed improved marginal adaptation when liners were included in material combinations. Groups utilizing liners demonstrated significantly reduced marginal gaps compared to those without.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Marginal adaptation is crucial for the longevity and success of indirect dental restorations.
- The resin coating technique (RCT) is utilized for indirect restorations, but material combinations can influence performance.
- Gingival margins can be located on enamel (EM) or cement (CM), potentially affecting restoration integrity.
Purpose of the Study:
- To evaluate the impact of different material combinations within the resin coating technique (RCT) on the marginal adaptation of indirect restorations.
- To compare the effectiveness of various bonding agents and liners on enamel and cement margins.
- To identify optimal material combinations for enhanced marginal seal in indirect restorations.
Main Methods:
- Eighty third molars were prepared with two cavities each, divided into 16 groups based on margin location (EM/CM) and material combinations.
- Teeth underwent thermocycling (2,000 cycles, 5-55°C) and load-cycling (50,000 cycles, 50 N) to simulate oral conditions.
- Marginal gap analysis was performed using Caries Detector and Image-Tool 3.0 software, with results analyzed by ANOVA and Tukey's test.
Main Results:
- Groups that did not incorporate a liner into their resin coating technique (RCT) material combinations exhibited the highest percentages of marginal gap on both enamel (EM) and cement (CM) margins.
- Specific material combinations with liners showed significantly lower marginal gap percentages compared to those without liners.
- Mean marginal gap percentages varied across groups, with the lowest values observed in combinations that included a liner.
Conclusions:
- The inclusion of a liner in the material combination for the resin coating technique (RCT) significantly improves the marginal adaptation of indirect restorations.
- Optimal RCT material combinations for minimizing marginal gaps involve the use of liners, regardless of whether the gingival margin is on enamel or cement.
- This finding has direct implications for selecting appropriate materials to enhance the clinical performance and durability of indirect dental restorations.