Print ISSN: 1812-1217

Online ISSN: 1998-0345

Keywords : Endosteal implant


Dimensional accuracy of impression techniques for the endosteal implants (An in vivo study): Part II

Nadira A Hatim; Basim M Al-Mashaiky

Al-Rafidain Dental Journal, Volume 7, Issue 2, Pages 131-137
DOI: 10.33899/rden.2007.8958

Aims: To determine the most accurate impression techniques and materials to transfer the exact
position of a single implant to stone die to construct the prosthesis for selected clinical cases. Materials
and methods: Five clinical cases were selected with special criteria to construct implant (Frialit–2)
prosthesis on a stone die with high accuracy according to the results of study. Four impression
techniques were used (direct and indirect, each with one and two steps) using condensation, addition
(heavy, medium and light consistencies) silicone impression materials. Ten impressions were taken for
each patient to produce a total number of 50 stone casts. The direct and indirect measurements were
performed by using digital vernier. Results: The significant differences between the impression
techniques at the three axes of dimensions (p ≤0.05) were applied clinically to construct the fixed
prosthesis for each patient. The results of this study showed that the high dimensional change of
laboratory cast was related to indirect one step impression technique to transform the implant position
from patient mouth to laboratory cast. Addition curing (medium consistency) silicone impression
material produced the lowest accurate stone die. Conclusions: The results of this study showed that the
direct two steps impression technique was the accurate impression technique for transformation of
implant position from patient mouth to laboratory cast. Additional curing (light and heavy consistency)
silicone impression material produced the most accurate stone die and gave a successful treatment to
the patient.

Dimensional accuracy of impression techniques for the endosteal implants (An in vitro study): Part I

Nadira A Hatim; Basim M Al–Mashaiky

Al-Rafidain Dental Journal, Volume 7, Issue 1, Pages 20-31
DOI: 10.33899/rden.2006.39805

Aims: To detect the most accurate impression materials and technique to transfer single or multiple implants position from the master model to the stone dies by two methods of measurement. Materials and methods: Two master models (Cl III Kennedy with single implant Frialit–2, and Cl II free end saddle with double implants) were fabricated. Four impression techniques were used (direct, and indirect, each with one, and two steps) using condensation, addition (heavy and light consistencies) and addition (medium consistency) silicone impression materials. Five impressions were taken for each technique to produce a total number of 100 stone casts. A mechanical apparatus was carefully designed to allow constant repeatable position of stock impression tray to the master model, and to allow vertical removal of the impression tray that helps to standardize the path of removal. The measurements were performed by using digital caliber and optical micrometer microscope. Results: Showed that the direct (open tray) two steps technique was the accurate technique for transferring implant position to the laboratory cast. The two steps impression technique was the most accurate one than one step. There were no significant differences between single, and double implants. There was significant difference between the two methods of measurements in (Z) axis for both single and double implants case. Conclusion: The direct (open tray), two steps impression technique, and addition impression material is the most accurate technique. The numbers of dental implants had no significant effect on accuracy of stone cast.