Guided access cavity preparation using cone-beam computed tomography and optical surface scans - an ex vivo study
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Guided access cavity preparation using cone-beam computed tomography and optical surface scans - an ex vivo study. / Buchgreitz, J; Buchgreitz, M; Mortensen, D; Bjørndal, L.
I: International Endodontic Journal, Bind 49, Nr. 8, 2016, s. 790-795.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Guided access cavity preparation using cone-beam computed tomography and optical surface scans - an ex vivo study
AU - Buchgreitz, J
AU - Buchgreitz, M
AU - Mortensen, D
AU - Bjørndal, L
N1 - © 2015 International Endodontic Journal. Published by John Wiley & Sons Ltd.
PY - 2016
Y1 - 2016
N2 - AIM: To evaluate ex vivo, the accuracy of a preparation procedure planned for teeth with pulp canal obliteration (PCO) using a guide rail concept based on a cone-beam computed tomography (CBCT) scan merged with an optical surface scan.METHODOLOGY: A total of 48 teeth were mounted in acrylic blocks. An apical canal preparation was created to simulate remnants of an apical root canal that acted as the target for a drill path. The test blocks were surface scanned, and merged with a CBCT scan, and a guide rail was made. A pathway for the bur was created through a metal sleeve within the guide rail into dentine. The distance was measured between the centres of the performed drill path and the apical target by two examiners. A maximum distance of 0.7 mm was defined based on the radius of the bur (0.6 mm) and the radius of a root canal just visible on a radiograph (0.1 mm). The t-test was used for evaluation, and intra- and inter-examiner reproducibility was expressed by intraclass correlation coefficients.RESULTS: The mean distance between the drill path and the target was significantly lower than 0.7 mm, and null hypothesis H0 : μ = 0.7 was rejected (CI 95%: 0.31;0.49, P < 0.001). Intra- and inter-examiner agreements reached excellent levels.CONCLUSIONS: The combined use of CBCT and optical scans for the precise construction of a guide rail led to a drill path with a precision below a risk threshold. The present technique may be a valuable tool for the negotiation of partial or complete pulp canal obliteration.
AB - AIM: To evaluate ex vivo, the accuracy of a preparation procedure planned for teeth with pulp canal obliteration (PCO) using a guide rail concept based on a cone-beam computed tomography (CBCT) scan merged with an optical surface scan.METHODOLOGY: A total of 48 teeth were mounted in acrylic blocks. An apical canal preparation was created to simulate remnants of an apical root canal that acted as the target for a drill path. The test blocks were surface scanned, and merged with a CBCT scan, and a guide rail was made. A pathway for the bur was created through a metal sleeve within the guide rail into dentine. The distance was measured between the centres of the performed drill path and the apical target by two examiners. A maximum distance of 0.7 mm was defined based on the radius of the bur (0.6 mm) and the radius of a root canal just visible on a radiograph (0.1 mm). The t-test was used for evaluation, and intra- and inter-examiner reproducibility was expressed by intraclass correlation coefficients.RESULTS: The mean distance between the drill path and the target was significantly lower than 0.7 mm, and null hypothesis H0 : μ = 0.7 was rejected (CI 95%: 0.31;0.49, P < 0.001). Intra- and inter-examiner agreements reached excellent levels.CONCLUSIONS: The combined use of CBCT and optical scans for the precise construction of a guide rail led to a drill path with a precision below a risk threshold. The present technique may be a valuable tool for the negotiation of partial or complete pulp canal obliteration.
U2 - 10.1111/iej.12516
DO - 10.1111/iej.12516
M3 - Journal article
C2 - 26201367
VL - 49
SP - 790
EP - 795
JO - International Endodontic Journal
JF - International Endodontic Journal
SN - 0143-2885
IS - 8
ER -
ID: 156560571