Fracture Resistance and Fracture Patterns of Endodontically Treated Premolars Using Different Sealers

AIC 27thAnnual Congress & ConsEURO, Bologna, İtalya, 7 - 09 Mayıs 2026, ss.1-2, (Özet Bildiri)

Objectives: Restoration of endodontically treated teeth is challenging due to structural loss and increased

fracture risk. This in vitro study evaluated the effect of different root canal sealers on the fracture resistance and

fracture pattern of endodontically treated mandibular premolars.

Materials and Methods: Forty extracted mandibular premolars were divided into five groups: three

experimental groups (n=10) and two control groups (n=5). After standardized endodontic treatment and mesio-

occluso-distal (MOD) cavity preparations, obturation in the experimental groups were performed using A)

bioceramic (CeraSeal), B) bioceramic (Dia-Root), and C) resin based (AH Plus) root canal sealers. Cavities were

sealed with glass ionomer, temporarily restored and stored in distilled water. Then all specimens were embedded

in acrylic resin and permanently restored with conventional composite resin. All specimens underwent 5000

thermocycles to simulate oral conditions. Fracture resistance was tested using a universal testing machine with a

compressive load applied perpendicular to the long axis of the tooth until fracture; maximum load was recorded

in Newtons. Fracture patterns were classified as Type I (restoration only), Type II (crown fractures not extending

to the root), Type III (restorable crown–root fractures extending <1 mm below the acrylic line), or Type IV (non-

restorable crown–root fractures extending >1 mm below the acrylic line). Statistical analysis was performed

using SPSS software, with significance set at p<0.05.

Results: No statistically significant difference in fracture resistance was found among experimental groups

(p=0.686). When all groups were evaluated collectively, no significant difference in fracture resistance values

was observed (p=0.529). Fracture mode distribution differed among groups: CeraSeal showed predominantly

Type II fractures (60%), Dia-Root showed mainly Type II (50%), whereas AH Plus exhibited mostly Type IV

fractures (70%).

Conclusion: While sealer type did not significantly influence fracture resistance, bioceramic sealers were

associated with more favorable fracture patterns than the resin-based sealer.

Keywords: root canal treatment, fracture resistance, sealer