Fracture resistance of weakened teeth restored with condensable resin with and without cusp coverage

Abstract

Objectives:This in vitro study evaluated the fracture resistance of weakened human premolars (MOD cavity preparation and pulp chamber roof removal) restored with condensable resin composite with and without cusp coverage.Material and Methods:Thirty human maxillary premolars were divided into three groups: Group A (control), sound teeth; Group B, wide MOD cavities prepared and the pulp chamber roof removed and restored with resin composite without cusp coverage; Group C, same as Group B with 2.0 mm of buccal and palatal cusps reduced and restored with the same resin. The teeth were included in metal rings with self-curing acrylic resin, stored in water for 24 h and thereafter subjected to a compressive axial load in a universal testing machine at 0.5 mm/min.Results:The mean fracture resistance values ± standart deviation (kgf) were: group A: 151.40 ± 55.32, group B: 60.54 ± 12.61, group C: 141.90 ± 30.82. Statistically significant differences were found only between Group B and the other groups (p<0.05). The condensable resin restoration of weakened human premolars with cusp coverage significantly increased the fracture resistance of the teeth as compared to teeth restored without cusp coverage.Conclusion:The results showed that cusp coverage with condensable resin might be a safe option for restoring weakened endodontically treated teeth.

Three-year Clinical Evaluation of Cuspal Coverage with Combined Composite–Amalgam in Endodontically-treated Maxillary Premolars

“…This problem may be exacerbated in teeth with a weakened or missing marginal ridge. [3][4] There is a greater frequency of fracture in tworooted maxillary premolars than in single-rooted premolars. Lateral excursive forces can shear the remaining cusps or cause vertical root fracture, leading to periodontal surgery or extraction.…”

“…1,[4][5]7 Full metal-ceramic crowns have been recommended as a way to provide good esthetic results in premolars. Tooth preparation for this crown requires a substantial reduction in tooth structure, so that a post is needed to provide core retention.…”

“…8 In addition, treatment may lead to the emergence of restorative difficulties, such as a cement line that leads to cement dissolving in oral fluid, a lack of consistent optimal adaptation and the need for gingival retraction at subgingival margins. 4,7,10 These disadvantages may also be involved in other indirect esthetic restorations.…”

Aşiri Kron Harabi̇yeti̇ Olan Kanal Tedavi̇li̇ Di̇şlerde Cad/Cam İle Endokron Uygulamalari: Olgu Seri̇si̇

“…Restorasyonun daha retantif olması ve dişin kırılma dayanımının attırılması amacıyla, tüm okluzal yüzeyin endokron restorasyonu ile rehabilite edilmesine karar verilmiştir. 25 …”

Effect of restorative techniques on fracture resistance of endodontically treated premolars

“…Dental amalgam has been characterized as technically easy to use and a clinically predictable material, with favorable mechanical properties [10]. The use and success rate of dental amalgams have been well documented and they are the most cost effective materials in posterior teeth restorations, but they are declining in use in dentistry mainly due to the unaesthetic appearance and concerns about the hazard of mercury [11][12][13].…”