Journal
JOURNAL OF ORAL SCIENCE
Volume 63, Issue 1, Pages 70-74Publisher
NIHON UNIV, SCHOOL DENTISTRY
DOI: 10.2334/josnusd.20-0338
Keywords
fracture strength; multi-post; oval post; post-endodontic restoration; single post
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This study compared the influence of coronal wall number and post-endodontic restorations on the mechanical strength of maxillary premolars, showing that multi-post design improved fracture resistance mostly in teeth lacking marginal ridges.
Purpose: The aim of this study was to compare the influence of the number of coronal walls and post-endodontic restorations on the mechanical strength of 165 recently extracted endodontically treated maxillary premolars. Methods: The teeth were divided into 3 control (no post) and 3 test groups according to the number of residual walls. Each test group was divided into subgroups according to the type of post-endodontic restoration (single, oval, and multi-post techniques). Samples were prepared conforming to the assigned subgroup. A universal loading machine applied a load parallel to the longitudinal axis of the teeth, thus simulating physiological occlusion. ANOVA and the Kruskal Wallis test were used for comparisons (P <= 0.05), and Tukey's test for multiple comparisons. Results: For intact teeth, significant differences were found among all 3 subgroups, with single post showing the highest values. For 3 residual walls, oval post resulted in significantly lower values than single and multi-post systems. For 2 residual walls, the multi-post technique showed almost twice the resistance of oval post restorations. Conclusion: In oval canals the use of a single or multi-post technique increased post-and-core resistance even in intact teeth, whereas oval fiber posts showed no improvements. Multi-post design improved fracture resistance mostly in maxillary premolars lacking both marginal ridges.
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