ArticleCureus2026
Influence of Ferrule Height and Uniformity on Fracture Resistance of Post-core Crowns: An In Vitro Analysis.
Article in Cureus, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Objective To evaluate the effect of uniform versus non-uniform ferrule configurations on fracture resistance and failure mode in endodontically treated maxillary central incisors restored with cast dowel-core and metal-ceramic crowns. Methods In this in-vitro, controlled study, 50 extracted maxillary central incisors were equally allocated to five groups: intact crowned (CRN), root-canal-treated crowned (RCT/CRN), uniform 2-mm ferrule (2FRL), non-uniform ferrule (0.5/2FRL; 0.5 mm proximal/2 mm labial-lingual), and no ferrule (0FRL). Specimens were statically loaded at 45° to failure; peak load (N) was the primary outcome. Failures were classified as restorable or catastrophic, and reliability was summarized as P(load >400 N, >500 N) under a normal model fitted to each group. Results Groups differed significantly (analysis of variance (ANOVA), p<0.001; very large effect). CRN, RCT/CRN, and 2FRL were comparable, indicating preserved strength when a continuous 2-mm ferrule engages coronal dentin. The non-uniform ferrule showed reduced resistance versus these groups (Tukey p<0.001) yet exceeded 0FRL, which performed worst. Analysis of covariance (ANCOVA) confirmed these patterns and identified greater coronal height as independently favourable. Ferrule adequacy shifted failure towards restorable patterns and increased the probability of exceeding clinical thresholds: highest for CRN/RCT/CRN/2FRL, intermediate for the non-uniform ferrule, and minimal without a ferrule. Conclusion Ferrule configuration is the primary determinant of mechanical behaviour. A continuous 2-mm ferrule preserves strength and favours restorable fractures; a non-uniform ferrule offers partial but meaningful protection and is preferable to none. Clinically, preserve coronal dentin and create a 2-mm circumferential collar whenever feasible.
Indexed as
Identifiers
What Socratic holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.