Abstract
Statement of problem
Laser sintering has several processing parameters, typically under the control of
dental laboratory technicians. Laser scan speed is an important parameter, which has
a significant effect on manufacturing time but may also affect the adaptation of restorations.
However, limited information is available regarding its impact.
Purpose
The purpose of this in vitro study was to evaluate the intaglio surface adaptation
of laser-sintered cobalt-chromium single-crown frameworks sintered at laser scanning
speeds of 1, 3, and 6 m/s.
Material and methods
A master bronze metal die was prepared and scanned by using a laboratory scanner to
fabricate the metal frameworks for 4 groups (n=10). In group C, the frameworks were
fabricated by using the lost-wax method (control). In group L1, L3, and L6, the frameworks
were fabricated by using direct metal laser melting (DMLM) at laser scanning speeds
of 1, 3, and 6 m/s. After fabrication, 3 scanning data sets were used to evaluate
the intaglio surface adaptation: the master die, the intaglio surface of each metal
framework, and each metal framework seated on the master die. The intaglio surface
adaptation of the metal frameworks was evaluated by using a metrology software program.
The data were statistically analyzed by using a 1-way ANOVA, the Tukey honestly significant
difference test, and the Tamhane T2 test (α=.05).
Results
The highest mean intaglio surface discrepancy value was obtained from group L6, and
this was significantly different from the other 3 groups (P<.001). No significant intaglio surface discrepancy differences were found among the
other groups.
Conclusion
The amount of intaglio surface discrepancy increased when the laser scanning speed
reached 6 m/s.
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Article info
Publication history
Published online: March 05, 2020
Identification
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
