Journal of endodontics · 2026
Fracture Resistance and Biomechanical Behavior of Retreated Teeth Obturated with Different Sealers: Combined Laboratory Testing and Finite Element Analysis.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод в очереди
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Çapkın Hümeyra, Peker Fatma Begüm, Güneşer Mehmet Burak
Аннотация
INTRODUCTION: This study evaluated the effect of different sealers on fracture resistance of retreated mandibular premolars and characterized their biomechanical behavior using three-dimensional finite element analysis (FEA).
METHODS: One hundred twenty-four single-rooted premolars were instrumented and initially obturated with AH Plus. Twelve teeth with intact fillings served as positive controls, and 12 retreated but unfilled teeth served as negative controls. The remaining samples were retreated and randomly assigned to 5 sealer groups (n = 20): AH Plus, GuttaFlow Bioseal, TotalFill BC, BioRoot RCS, and NeoSealer Flo. After thermocycling, fracture resistance was tested under 45° oblique loading. Corresponding micro-computed tomography-based FEA models were generated to compare von Mises stress distributions with and without a simulated periapical lesion.
RESULTS: Fracture resistance differed significantly among groups (P < .001). The negative control showed the lowest resistance, whereas the positive control exhibited the highest values (P < .05). No statistically significant differences were observed among the experimental sealer groups (P > .05). FEA demonstrated distinct stiffness-dependent patterns: NeoSealer Flo and TotalFill BC concentrated stresses within the sealer, whereas limiting dentinal stress; GuttaFlow Bioseal transmitted greater stresses to dentin; AH Plus and BioRoot RCS showed intermediate responses.
CONCLUSIONS: In retreatment conditions, sealer type influences internal stress distribution even when fracture resistance values are comparable. Bioceramic sealers with higher elastic modulus may reduce dentinal stress and enhance biomechanical compatibility. Clinicians should consider not only biological performance but also mechanical compatibility when selecting sealers to support long-term structural preservation of retreated teeth.
METHODS: One hundred twenty-four single-rooted premolars were instrumented and initially obturated with AH Plus. Twelve teeth with intact fillings served as positive controls, and 12 retreated but unfilled teeth served as negative controls. The remaining samples were retreated and randomly assigned to 5 sealer groups (n = 20): AH Plus, GuttaFlow Bioseal, TotalFill BC, BioRoot RCS, and NeoSealer Flo. After thermocycling, fracture resistance was tested under 45° oblique loading. Corresponding micro-computed tomography-based FEA models were generated to compare von Mises stress distributions with and without a simulated periapical lesion.
RESULTS: Fracture resistance differed significantly among groups (P < .001). The negative control showed the lowest resistance, whereas the positive control exhibited the highest values (P < .05). No statistically significant differences were observed among the experimental sealer groups (P > .05). FEA demonstrated distinct stiffness-dependent patterns: NeoSealer Flo and TotalFill BC concentrated stresses within the sealer, whereas limiting dentinal stress; GuttaFlow Bioseal transmitted greater stresses to dentin; AH Plus and BioRoot RCS showed intermediate responses.
CONCLUSIONS: In retreatment conditions, sealer type influences internal stress distribution even when fracture resistance values are comparable. Bioceramic sealers with higher elastic modulus may reduce dentinal stress and enhance biomechanical compatibility. Clinicians should consider not only biological performance but also mechanical compatibility when selecting sealers to support long-term structural preservation of retreated teeth.