Comparative evaluation of dentin microcrack formation after root canal preparation with different nickel-titanium instrument systems based on micro-CT: a systematic review and meta-analysis

Background

Dentin microcracks following root canal treatment may progress to vertical root fractures, a severe clinical complication. Engine-driven nickel-titanium (NiTi) instruments are associated with dentin microcrack initiation, but current evidence remains inconsistent. This review systematically synthesizes micro-CT-derived evidence on the effects of different NiTi instrument systems on dentin microcrack formation.