Dentist laboratory communication

الملخص EN

The aim of this study was to evaluate the common errors that may occur during crown and bridge construction.

Four hund-red stone models were used in this study for fabrication of 265 bridges and 135 sin-gle crown.

The total number of units was 1141.

Four main parameters were evalua-ted for each stone model: General informa-tion about the case, the condition of the stone model, the type of impression mater-ial and the prepared abutment tooth.

The result of this study showed that 33.7 % of the models were one unit and 48.7 % of the models were 2–4 units and the remaining 17.5 % of the models were more than five units, 8.7 % of the models were without opposing arch.

Alginate imp-ression materials were used in 95% of the cases and only 5 % of the cases elastomeric impression material were used.

The finish-ing line was absent in 19.7 % of the cases.

Enough tooth reduction was done in 61.3 % of the cases and 16.3 % of the cases showed too much tooth reduction while 22.4 % of the cases the tooth reduction was not enough.

In order to avoid these errors continuous education courses and journal club are highly recommended.