TY - JOUR
T1 - Non-invasive quantification of resin-dentin interfacial gaps using optical coherence tomography
T2 - Validation against confocal microscopy
AU - Bakhsh, Turki A.
AU - Sadr, Alireza
AU - Shimada, Yasushi
AU - Tagami, Junji
AU - Sumi, Yasunori
N1 - Funding Information:
This research was supported partly by the Grant-in-Aid for Scientific Research (Nos. 21592415 and 22791924 ) from the Japan Society for the Promotion of Science , partly by the Research Grant for longevity sciences (21A-8) from Ministry of Health, Labor and Welfare , and partly from the Global Center of Excellence Program, International Research Center for Molecular Science in Tooth and Bone Diseases at Tokyo Medical and Dental University .
PY - 2011/9
Y1 - 2011/9
N2 - Objectives: Regardless of the cause, gap formation at the tooth-restoration interface may result in treatment failure; non-destructive assessment and monitoring of these defects are important. The aim of this in vitro study is to assess the tooth-restoration interface using a non-invasive technique; swept source optical coherence tomography (SS-OCT) and to confirm the findings with confocal laser scanning microscope (CLSM). Methods: Cylindrical class-I cavities (3 mm in diameter and 1.5 mm in depth) were prepared in the occlusal surface of human premolars. Each cavity was restored using an all-in-one adhesive system (Clearfil Tri-S Bond) and one of the three types of composites placed in bulk; Majesty Posterior, AP-X and Majesty LV (all by Kuraray Medical, Japan). Ten serial cross-sectional images of the whole restored cavity were obtained by SS-OCT at 1319 nm center wave length, to which locations the specimens were later trimmed, polished and observed under CLSM. An image analysis software was used to detect significant peaks in the signal intensity at the resin-dentin interface of the cavity floor. The presence and dimensions of gaps at the interface were also confirmed by CLSM. Results: Increased SS-OCT signal intensity along the interface corresponded well to the interfacial gaps detected by CLSM. The actual gap size detected ranged from 26 μm to 1.9 mm in length, and the universal composite APX showed lowest interfacial gaps. Conclusion: SS-OCT imaging technology can be used to non-invasively detect and quantify micrometer gaps at the bottom of composite restorations, and potentially become a monitoring tool for composite restorations both in the laboratory research, and in the clinics.
AB - Objectives: Regardless of the cause, gap formation at the tooth-restoration interface may result in treatment failure; non-destructive assessment and monitoring of these defects are important. The aim of this in vitro study is to assess the tooth-restoration interface using a non-invasive technique; swept source optical coherence tomography (SS-OCT) and to confirm the findings with confocal laser scanning microscope (CLSM). Methods: Cylindrical class-I cavities (3 mm in diameter and 1.5 mm in depth) were prepared in the occlusal surface of human premolars. Each cavity was restored using an all-in-one adhesive system (Clearfil Tri-S Bond) and one of the three types of composites placed in bulk; Majesty Posterior, AP-X and Majesty LV (all by Kuraray Medical, Japan). Ten serial cross-sectional images of the whole restored cavity were obtained by SS-OCT at 1319 nm center wave length, to which locations the specimens were later trimmed, polished and observed under CLSM. An image analysis software was used to detect significant peaks in the signal intensity at the resin-dentin interface of the cavity floor. The presence and dimensions of gaps at the interface were also confirmed by CLSM. Results: Increased SS-OCT signal intensity along the interface corresponded well to the interfacial gaps detected by CLSM. The actual gap size detected ranged from 26 μm to 1.9 mm in length, and the universal composite APX showed lowest interfacial gaps. Conclusion: SS-OCT imaging technology can be used to non-invasively detect and quantify micrometer gaps at the bottom of composite restorations, and potentially become a monitoring tool for composite restorations both in the laboratory research, and in the clinics.
KW - Confocal laser scanning microscopy
KW - Gap
KW - Non-destructive testing
KW - Optical coherence tomography
KW - Resin composite
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U2 - 10.1016/j.dental.2011.05.003
DO - 10.1016/j.dental.2011.05.003
M3 - Article
C2 - 21665263
AN - SCOPUS:80051471240
VL - 27
SP - 915
EP - 925
JO - Dental Materials
JF - Dental Materials
SN - 0109-5641
IS - 9
ER -