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Published on: April 29, 2014
[Application of the pin-hole marker measurement of the irregular silicone impression accuracy]
Yao Gong1, Jie Chen, Ye-kan Li
1Department of Orthodontics, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, China. gongyao0328@hotmail.com
Purpose:
To investigate the feasibility of the pin-hole marker measurement of the irregular silicone dental impression accuracy.
Methods:
The metal model simulating abutment preparations had triangle-formed circular needles on the surface. Two silicone impressions were made by the metal model with the corresponding pin-hole markers. The dimensional change of the markers was evaluated by stereomicroscope. The records were output by the software which could simulate the centre of a circle to measure the displacement and dimensional accuracy.
Results:
The outline of pin-hole marker was clear and shape was stable. Values of center coordinates were repeated well. The percentage of linear dimensional change of two impression samples was 0.023% and 0.042% at 48h respectively. Between two abutment preparations, the percentage of linear dimensional change of Zhermeck silicone impression increased 0.214% (45.1μm) at 1h and decreased 0.019% (4.0μm) at 48h while 3M silicone impression increased 0.087%(18.2μm) at 1h and decreased 0.09% (18.8μm) at 48h.
Conclusion:
The pin-hole marker measurement of the irregular silicone impression accuracy was feasible.
