A prospective study assessing the effect of coronal tooth structure loss on the outcome of root canal retreatment

TY - JOUR

T1 - A prospective study assessing the effect of coronal tooth structure loss on the outcome of root canal retreatment

AU - Al-Nuaimi, N

AU - Patel, S

AU - Austin, Rupert

AU - Mannocci, F

N1 - This article is protected by copyright. All rights reserved.

PY - 2017/12

Y1 - 2017/12

N2 - AIM: To evaluate the outcome of secondary root canal treatment (retreatment) on posterior teeth in relation to the residual volume of coronal tooth structure, measured with an intraoral scanner, using periapical radiography and cone beam computed tomography (CBCT).METHODOLOGY: A total of 137 posterior teeth in 121 patients were assessed clinically and radiographically using periapical radiographs and CBCT scans at baseline and 1-year after root canal retreatment. The increase or decrease in the size of preoperative periapical radiolucencies and development of new radiolucencies were assessed by a consensus panel consisting of two pre-calibrated examiners. A clinical impression was obtained for each tooth after completion of root canal retreatment, before the placement of the temporary restoration and following cast restoration placement to produce two casts. All casts were scanned using an intraoral digital scanner and the three-dimensional volume of remaining tooth structure calculated. Teeth were also classified according to the number of remaining coronal walls before core build-up. Chi-square test was used to determine the association between the outcome of root canal retreatments and the volume of remaining coronal tooth structure.RESULTS: At the 1-year recall, teeth retaining less than 30% of their original tooth structure volume had a significantly higher proportion of unfavourable outcomes (χ(2) , P<0.05, odds ratio [OR], 2.580; 95% CI, 1.026-6.487).CONCLUSIONS: The loss of tooth structure volume is an objective parameter that can be used to predict the probability of success of root canal retreatments. At 1-year follow-up, the percentage of unfavourable outcomes of root canal retreated teeth was significantly higher when less than 30% of the original tooth tissue structure was present at baseline. This article is protected by copyright. All rights reserved.

AB - AIM: To evaluate the outcome of secondary root canal treatment (retreatment) on posterior teeth in relation to the residual volume of coronal tooth structure, measured with an intraoral scanner, using periapical radiography and cone beam computed tomography (CBCT).METHODOLOGY: A total of 137 posterior teeth in 121 patients were assessed clinically and radiographically using periapical radiographs and CBCT scans at baseline and 1-year after root canal retreatment. The increase or decrease in the size of preoperative periapical radiolucencies and development of new radiolucencies were assessed by a consensus panel consisting of two pre-calibrated examiners. A clinical impression was obtained for each tooth after completion of root canal retreatment, before the placement of the temporary restoration and following cast restoration placement to produce two casts. All casts were scanned using an intraoral digital scanner and the three-dimensional volume of remaining tooth structure calculated. Teeth were also classified according to the number of remaining coronal walls before core build-up. Chi-square test was used to determine the association between the outcome of root canal retreatments and the volume of remaining coronal tooth structure.RESULTS: At the 1-year recall, teeth retaining less than 30% of their original tooth structure volume had a significantly higher proportion of unfavourable outcomes (χ(2) , P<0.05, odds ratio [OR], 2.580; 95% CI, 1.026-6.487).CONCLUSIONS: The loss of tooth structure volume is an objective parameter that can be used to predict the probability of success of root canal retreatments. At 1-year follow-up, the percentage of unfavourable outcomes of root canal retreated teeth was significantly higher when less than 30% of the original tooth tissue structure was present at baseline. This article is protected by copyright. All rights reserved.

U2 - 10.1111/iej.12760

DO - 10.1111/iej.12760

M3 - Article

C2 - 28294354

SN - 0143-2885

VL - 50

SP - 1143

EP - 1157

JO - International Endodontic Journal

JF - International Endodontic Journal

IS - 12

ER -