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Influence of cusp coverage on the fracture resistance of premolars with endodontic access cavities
Author(s) -
ElAyouti A.,
Serry M. I.,
GeisGerstorfer J.,
Löst C.
Publication year - 2011
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2011.01859.x
Subject(s) - cusp (singularity) , dentistry , fracture (geology) , orthodontics , materials science , resistance (ecology) , medicine , mathematics , composite material , geometry , biology , ecology
ElAyouti A, Serry MI, Geis‐Gerstorfer J, Löst C. Influence of cusp coverage on the fracture resistance of premolars with endodontic access cavities. International Endodontic Journal , 44 , 543–549, 2011. Abstract Aim To assess the influence of cusp reduction and coverage with composite resin on the fracture resistance of premolars with prepared access cavities. Methodology Endodontic access cavities were prepared in 60 premolar teeth that were divided into four test groups: R1, R2, R3 and NR ( n = 15). In all test groups, MOD cavities were prepared and extended towards one of the cusps. The remaining cusp‐wall thickness was: 1–1.5 mm in R1, 1.5–2 mm in R2 and 2–3 mm in both R3 and NR groups. In addition, in group R1, R2 and R3 the same cusp was reduced in height to 3.5 mm. Cuspal coverage and MOD restorations were performed using composite resin. Ten intact premolars served as positive controls and another ten MOD‐prepared unrestored premolars as negative controls. Teeth were submitted to cyclic fatigue of 1.2 million cycles. A compressive load was applied 30° to the long axis of the teeth until fracture. Fracture loads were recorded and the means and the Confidence Intervals were compared. Results The mean fracture resistance of each of the cusp‐reduced groups R1, R2 and R3 (603, 712 and 697 N, respectively) was significantly higher than the non‐reduced cusp group (305 N) and was comparable to the intact‐premolar group (653 N). Conclusions Cusp reduction and coverage with composite resin significantly increased the fracture resistance of premolar teeth with MOD and endodontic access cavities.