IADR Abstract Archives
Quality-control of Composite Resin Restorations using Optical Coherence Tomography
Objectives: The aim of this study was to assess the ability of Optical Coherence Tomography (OCT) to detect the morphology, internal and marginal adaptation of different resin-based composite (RBC) restorations to tooth structure placed by different techniques and operators
Methods: 45 extracted sound human molar and premolar teeth were obtained following ethical approval and informed consent at the UCL Eastman Dental Hospital. Two Class I occlusal cavities were prepared in each tooth (N=90): 2mm widthx3mm lengthx2mm depth. Samples were divided into 3 groups (N=10) and then divided into 3 restorative subgroups following the material and technique used (Essentia™ (GC) RBC using an oblique layering technique; One Bulk Fill™ (3M) and Essentia™ (GC) RBCs using a horizontal 2mm fill technique). The same 3 step adhesive system was followed for all groups following the manufacturer’s instructions (3M ESPE Scotchbond MultiPurpose). OCT scans and radiographs were taken at baseline, after cavity preparation, adhesive placement, part fill (for the layering group), and post-operatively. Finally, 8 representative specimens from the study were sectioned for SEM validation.
Results: Our study demonstrated that the number of voids between operators in relation to techniques and materials was significantly reduced by 31% from the layered to the horizontal technique. Operators or materials were not significantly different in terms of void location, adaptation, or flash presence. RBC adaptation was improved with the horizontal compared to the layered technique (90% and 40% of the cases respectively) (p < 0.05). Poor adaptation was mostly recorded as a result of interfacial void location rather than open margin which was only observed in 5 samples (layered group only). The presence of adhesive layer observed with OCT was confirmed by SEM analysis.
Conclusions: OCT can non-destructively provide information about the performance, morphology, internal and marginal adaptation of RBC restorations placed by different techniques.
Methods: 45 extracted sound human molar and premolar teeth were obtained following ethical approval and informed consent at the UCL Eastman Dental Hospital. Two Class I occlusal cavities were prepared in each tooth (N=90): 2mm widthx3mm lengthx2mm depth. Samples were divided into 3 groups (N=10) and then divided into 3 restorative subgroups following the material and technique used (Essentia™ (GC) RBC using an oblique layering technique; One Bulk Fill™ (3M) and Essentia™ (GC) RBCs using a horizontal 2mm fill technique). The same 3 step adhesive system was followed for all groups following the manufacturer’s instructions (3M ESPE Scotchbond MultiPurpose). OCT scans and radiographs were taken at baseline, after cavity preparation, adhesive placement, part fill (for the layering group), and post-operatively. Finally, 8 representative specimens from the study were sectioned for SEM validation.
Results: Our study demonstrated that the number of voids between operators in relation to techniques and materials was significantly reduced by 31% from the layered to the horizontal technique. Operators or materials were not significantly different in terms of void location, adaptation, or flash presence. RBC adaptation was improved with the horizontal compared to the layered technique (90% and 40% of the cases respectively) (p < 0.05). Poor adaptation was mostly recorded as a result of interfacial void location rather than open margin which was only observed in 5 samples (layered group only). The presence of adhesive layer observed with OCT was confirmed by SEM analysis.
Conclusions: OCT can non-destructively provide information about the performance, morphology, internal and marginal adaptation of RBC restorations placed by different techniques.
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