Hesse, K. (2017) Oppervlakte-ruwheden van Stock en CAD/CAM implantaatopbouwen: een in vitro studie. thesis, Dentistry.
Full text available on request.Abstract
Background: Abutments are manufactured through individual milling (CAD/CAM) as well as machining (Stock). It is however unclear whether contemporary abutments from both these processes, CAD/CAM and Stock, still meet the suggested optimal surface roughness (Ra) of 0.2 µm. Purpose: The goal of this research is to verify if the abutments measure up to the suggested optimal surface roughness (Ra) of 0.2 µm as suggested in literature. An in vitro comparative analysis of surface roughness of the ‘permusocal’ elements of both CAD/CAM as Stock abutments will be performed. Furthermore, possible differences in surface roughness as a result of finishing processes will be analyzed. Material and method: A total of fifty abutments are individually measured on two randomly selected points with an Atomic Forced Microscope (AFM; The Dimension V Scanning Probe Microscope (SPM)) resulting in a sample surface-roughness measure (Ra) in nanometer. Five study groups are formed: Unpolished CAD/CAM, Machine-polished CAD/CAM, Hand�polished CAD/CAM, Unpolished Stock, and Machine-polished Stock implant abutments. Results: The sample categories Machine-polished CAD/CAM, Hand-polished CAD/CAM, and Machine-polished Stock have an average surface-roughness well below the suggested optimal surface-roughness (Ra) of 0.2 µm, respectively 0.082 µm, 0.075 µm, and 0.110 µm. However, the sample categories Unpolished CAD/CAM and Unpolished Stock do meet the optimal surface-roughness (Ra) of 0.2 µm. Hand-polished CAD/CAM abutments showed the lowest surface-roughness on average. Although the difference between Machine-polished CAD/CAM and Hand-polished CAD/CAM turned out to be insignificant (p=0.516). Moreover, differences between manufacturing variants CAD/CAM and Stock are also insignificant (p=0.552). Conclusion: CAD/CAM manufactured sample abutments do not significantly vary in surface�roughness(Ra) from Stock manufactured (Dyna brand) sample abutments. However, both hand�as machine-polish processes lead to a drastic drop in abutment surface-roughness, resulting in abutment surface-roughness values (Ra) well below the suggested optimal surface-roughness of 0.2 µm. This is clinically relevant. Further research into the effects of this suboptimal surface-roughness should be performed.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Cune, dr. M.S. and Dijkstra, dr. R.J.B. |
| Faculty: | Medical Sciences |
| Date Deposited: | 18 Nov 2021 11:14 |
| Last Modified: | 22 Nov 2021 11:24 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/2800 |
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