Gehrke P, Sing T, Fischer C, Spintzyk S, Geis-Gerstorfer J.
In a current study, the authors – a team of dentists, dental technicians and materials scientists – examined the “Marginal adaptation and adhesive joint size of two-part CAD/CAM zirconium oxide implant abutments”. In the period between April 2015 and September 2016, the authors of the study dealt with laboratory tests, data collection and statistical analysis and presented this in a master's thesis. The results are presented in this short version.
The aim of the study was a comparative study of the fit, marginal adaptation and size of the cement gap/adhesive joint in two-part CAD/CAM-manufactured zirconium oxide abutments of zirconium oxide sleeves manufactured in the DEDICAM system (centrally) and laboratory-manufactured and bonded to titanium inserts (locally).
Material and method
Two groups of two-part zirconium oxide abutments were examined for their fit and adhesive joint size as part of a scanning electron microscope (SEM) laboratory study. The first group (control group) consisted of nine centrally manufactured two-piece hybrid zirconia abutments (DEDICAM, Camlog).
A second group (test group) included nine laboratory-made zirconium oxide sleeves (locally) bonded to titanium inserts (Camlog). After resin embedding, the test and control group abutments (n = 18) were processed using the thin section method and subjected to an SEM measurement of the external marginal and internal adhesive gap. A statistical analysis of the data obtained was carried out. The final comparison method for both groups was Welch's t-test.
Results
The test results for the fit of two-part hybrid abutments provided gap dimensions between 0 µm and 115,5 µm. The mean value for marginal adaptation / external adhesive joint size was 18,84 µm in the test group with a standard deviation of +/-7,61 µm. In the control group, 17,75 µm and a standard deviation of +/-3,96 µm were determined. The mean for the internal adhesive joint size was 51,73 µm in the test group, the standard deviation was +/- 10,70 µm and in the control group it was 57,30 µm with a standard deviation of +/- 3,88 µm.
Conclusion
The gap dimensions of centrally and externally manufactured hybrid abutments could be shown. Statistically, no significant difference (t (11,9) = 1,48, (p = 0,164)) could be demonstrated between the test and control groups.
Conclusion for everyday practice and laboratory life:
Both the hybrid abutments manufactured directly at Camlog and the external/locally manufactured abutments achieved the gap dimensions required by science, which correspond to the standards of conventional applied dental prosthetics.
Publication: Gehrke P, Sing T, Fischer C, Spintzyk S, Geis-Gerstorfer J.: Marginal and Internal Adaptation of Hybrid Abutment Assemblies After Central and Local Manufacturing, Respectively. The International Journal of Oral & Maxillofacial Implants. Volume 33. Number 4. 2018.