TY - JOUR

T1 - Optical coherence tomography systems for evaluation of marginal and internal fit of ceramic reconstructions

AU - Al-Imam, Hiba

AU - Benetti, Ana R.

AU - Tomlins, Pete

AU - Gotfredsen, Klaus

PY - 2022

Y1 - 2022

N2 - Purpose: To evaluate the marginal and internal fit of lithium disilicate and zirconia crowns using two optical coherence tomography (OCT) systems in order to estimate inter-system variations.Materials and methods: Ten lithium disilicate and 10 cubic stabilized zirconia crowns were placed on prepared artificial teeth without cement. Marginal discrepancy and internal cement gap of the crowns were assessed on images obtained using a swept source OCT (SS-OCT) and a spectral domain OCT (SD-OCT). Medians and interquartile ranges were calculated for both materials and OCT systems. Thereafter, Wilcoxon signed rank test was carried out.Results: No significant difference was found between the two OCT systems for absolute marginal discrepancy of either lithium disilicate (SS-OCT: 182 mm, SD-OCT: 214 mm; p ¼ .922) or zirconia crowns (SS-OCT: 116 mm, SD-OCT: 121 mm; p ¼ .232). Regarding internal cement gap, no significant difference was found between the two OCT systems for lithium disilicate crowns (SS-OCT: 128 mm, SD-OCT: 128 mm; p ¼ .064). However, for zirconia crowns the SD-OCT showed significantly higher (p ¼ .027) internal cement gap (92 mm) than the SS-OCT (68 mm). Moreover, it was not possible to assess the internal fit of zirconia crowns in 47% and 34% of the sites using SD-OCT and SS-OCT, respectively.Conclusions: No significant difference was noted in the ability of SS-OCT and SD-OCT to assess the marginal and internal fit of lithium disilicate crowns, nor the marginal fit of zirconia crowns. On the contrary, drawbacks regarding the assessment of internal fit of zirconia crowns using both OCT systems were observed.

AB - Purpose: To evaluate the marginal and internal fit of lithium disilicate and zirconia crowns using two optical coherence tomography (OCT) systems in order to estimate inter-system variations.Materials and methods: Ten lithium disilicate and 10 cubic stabilized zirconia crowns were placed on prepared artificial teeth without cement. Marginal discrepancy and internal cement gap of the crowns were assessed on images obtained using a swept source OCT (SS-OCT) and a spectral domain OCT (SD-OCT). Medians and interquartile ranges were calculated for both materials and OCT systems. Thereafter, Wilcoxon signed rank test was carried out.Results: No significant difference was found between the two OCT systems for absolute marginal discrepancy of either lithium disilicate (SS-OCT: 182 mm, SD-OCT: 214 mm; p ¼ .922) or zirconia crowns (SS-OCT: 116 mm, SD-OCT: 121 mm; p ¼ .232). Regarding internal cement gap, no significant difference was found between the two OCT systems for lithium disilicate crowns (SS-OCT: 128 mm, SD-OCT: 128 mm; p ¼ .064). However, for zirconia crowns the SD-OCT showed significantly higher (p ¼ .027) internal cement gap (92 mm) than the SS-OCT (68 mm). Moreover, it was not possible to assess the internal fit of zirconia crowns in 47% and 34% of the sites using SD-OCT and SS-OCT, respectively.Conclusions: No significant difference was noted in the ability of SS-OCT and SD-OCT to assess the marginal and internal fit of lithium disilicate crowns, nor the marginal fit of zirconia crowns. On the contrary, drawbacks regarding the assessment of internal fit of zirconia crowns using both OCT systems were observed.

U2 - 10.1080/26415275.2022.2122468

DO - 10.1080/26415275.2022.2122468

M3 - Journal article

C2 - 36211304

VL - 9

SP - 84

EP - 91

JO - Biomaterial investigations in dentistry

JF - Biomaterial investigations in dentistry

SN - 2641-5275

IS - 1

ER -