Original scientific paper
The Effect of Root Canal Preparation Depth on Retention of Endodontic Dowels
Joško Grgurević
Klara Sokler
Sebastijan Sandev
Darko Božić
Ivan Srzentić
Neven Jovanović
Abstract
When more than half of the crown of the endodontically treated tooth is missing, reinforcement with a cast post or a prefabricated dowel is needed. Four factors affect dowel retention: diameter, design, length, and employed cement. The purpose of this study was to measure the influence of root-canal preparation depth on retention force, and evaluate the commonly used principles. Thirty teeth were divided into 3 groups, root canals were prepared to 5.7 and 9 mm, and dowels were cemented. After 40 hours the tensile force needed to dislodge the dowels was recorded. At 5 mm depth it was 174.17 ± 29.45 N, at 7 mm 235.5 ± 46.93 N, and at 9 mm 255 ± 72.74 N. There was significant difference between dowel retention at 1/3 and at 1/2 of the root depth (5 and 7 mm). Difference between retention at 1/2 and at 2/3 of the root depth (7 and 9 mm) was not significant.
Keywords
dowel; preparation depth; retention
Hrčak ID:
11426
URI
Publication date:
15.12.2001.
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