Research and EducationEffect of cementation and aging on the marginal fit of veneered and monolithic zirconia and metal-ceramic CAD-CAM crowns
Section snippets
Material and methods
Seventy-two standardized dies simulating a first mandibular premolar were machined in stainless steel (Type 316L; Masteel). The dies were designed with a 1-mm-wide chamfer, 5 mm in height, and a 6-degree angle of convergence.1,13,15,16,18,19 The specimens were randomly divided (www.alazarinfo.es) into 6 groups (n=12 each as per the results of power analysis) categorized as per the material and the presence or not of cement: MC, VZ, and MZ. The cemented crowns were identified with the letter C.
Results
The mean and standard deviation of the marginal fit values for each group are presented in Table 4. VZ, MZ, and MC crowns without aging and without cementing exhibited similar vertical marginal discrepancies (Fig. 1). The ANOVA revealed no significant differences in the marginal fit among the studied groups with (F=0.27; P<.59) or without cement (F=0.41; P<.66). Similarly, the paired t test showed no differences in the marginal fit within each material group.
When marginal adaptation was
Discussion
The results of this study support the acceptance of the null hypotheses that no differences would be found in marginal discrepancy among the restorations analyzed, with or without cement, and that aging would not influence the marginal adaptation of zirconia restorations.
The marginal adaptation of all tested groups was within the clinically acceptable range,21 with values around 50 μm. The results indicate the precision of the CAD-CAM technology.1,15
In the present study, the analyzed groups
Conclusions
Based on the findings of this in vitro study, the following conclusions were drawn:
- 1.
The marginal fit in all groups was within the clinically acceptable range, with values around 50 μm.
- 2.
All tested groups showed similar marginal gaps with no differences among them.
- 3.
Cementation had no influence on the marginal adaptation in any of the groups
- 4.
Aging did not modify the marginal fit of the zirconia crowns.
- 5.
XRD technique showed a slight increase of the monoclinic phase in both types of zirconia restorations
Acknowledgments
The authors thank Dr Carmen Bravo, Center of Data Processing, Computing Service for Research Support, University Complutense of Madrid, for her assistance with the statistical analysis.
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Supported provided in part by a research grant between the University Complutense of Madrid and AVINENT Implant System SL. (No. 322-2014), through the last author.