Research and EducationComparison of marginal and internal fit of press-on-metal and conventional ceramic systems for three- and four-unit implant-supported partial fixed dental prostheses: An in vitro study
Section snippets
Material and Methods
Two different partially edentulous mandibular casts were fabricated from epoxy resin (Moravia; Boyman Boya Kimya Ltd). In one of the casts, the mandibular left premolars and first molar teeth were missing, and in the other, the mandibular left premolars and molars were missing. Two implants (Astra Implants, AstraTech; Dentsply Implants) were inserted in the first premolar and first molar region in the first cast, and 2 implants were inserted in the first premolar and second molar region in the
Results
The internal and marginal adaptation measurements of all study groups are shown in Table 1, Table 2, Table 3, Table 4, Table 5.
Mean marginal gap values of 89.60 ±23.43 μm for MCR, 85.57 ±24.31 μm for POM, and 109.30 ±46.44 μm for ZIR restorations were recorded. Marginal gap values recorded in ZIR were significantly higher than those in MCR (P<.05) (Table 1, Table 2). MCRb showed statistically significantly lower marginal gaps than MCRa. ZIRa showed statistically significantly lower marginal
Discussion
Marginal and internal adaptation is considered one of the most important criteria for the clinical success of implant-supported partial fixed dental prostheses.3 In this study, a replica technique was used to evaluate the marginal and internal gaps at different fabrication stages and with different restorative materials. The replica technique is less costly and time consuming than other techniques for generating test specimens.4, 20 In addition, the evaluations can be performed at different
Conclusions
Within the limitations of this study, the following conclusions can be drawn:
- 1.
Mean marginal gap measurements were 103.8 μm ±20.6 for conventionally veneered metal ceramic restorations, 81.6 μm ±18.3 μm for press-on-metal ceramic restorations, and 98.2 μm ±34.6 μm for CAD/CAM zirconia restorations. These mean values are considered clinically acceptable.
- 2.
When the measurements before and after the fabrication of superstructures were compared, the ceramic veneering process statistically increased
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