Radiographic periapical healing associated with root-treated teeth accessed through existing crowns: a historical controlled cohort study

The aim of this study was to determine the periapical healing rate and complications arising from non-surgical root canal treatment (NSRCT) conducted through existing retained restoration, compared that after removal restoration (direct or indirect) with subsequent placement a new crown. Two-hundred-and-forty-five teeth met inclusion criteria were followed up for 2 years. One-hundred-and-six had NSRCT completed cast restorations, 57 82 crowns direct restorations removed (respectively) received crown NSRCT. Periapical assessed radiographically using strict (complete healing) loose incomplete criteria. Multivariable logistic regression models used investigate effect prior on following NSRCT, adjusting potential confounding (p < 0.05). There no significant > 0.05) difference in rates amongst accessed (72%, 90%) versus those where (79%, 93%) (77%, findings adjusted influencing factor: size pre-operative radiolucency Of 109 initially crowns, 9 (8%) displayed porcelain fracture de-cementation. Performing an full coverage did not compromise associated low incidence complications. Crown before is mandatory but requires judicious pre-assessment current future marginal restorative integrity.