OCT- An Emerging Diagnostic Tool in Sensing Marginal Integrity of Nano Composites
Vijetha Badami
Department of Conservative Dentistry and Endodontics, Mamata Dental College, Giriprasad Nagar, Khammam, Telangana, India
Veeramachaneni Chandrasekhar
Department of Conservative Dentistry and Endodontics, Mamata Dental College, Giriprasad Nagar, Khammam, Telangana, India.
Sree Harsha Rayi *
Department of Conservative Dentistry and Endodontics, Mamata Dental College, Giriprasad Nagar, Khammam, Telangana, India
*Author to whom correspondence should be addressed.
Abstract
Objectives: The purpose of the present research was to demonstrate images of failure into the structure of nano composites using optical coherence tomography.
Methods: Ten human third mandibular molars were taken in the study. A class V cavity was prepared and restored with nano composite universal. 20 OCT images of each tooth were obtained and a total of 200 images were evaluated after restoration. Spectral domain (SD-OCT), at 840 nm and a measured spatial resolution of 10 µm was used for the study, which is based on the Michelson interferometer set-up and is controlled by the software OCT 800 – Complex Square/LabView, that collects data and generates the image. The restored surfaces were scanned in a bucco-lingual direction and tomographic images were obtained. Later, the crown of each tooth was sectioned in a occlusogingival direction (buccolingually) and images of each section were obtained by a Stereo microscope. Images of OCT and stereo microscope were compared and evaluated.
Results: Images obtained by OCT helped in identifying failures at surface and in the internal structure of composites.
Significance: Images obtained from OCT helps in detecting the failures, gaps, bubbles which adversely effect the longevity of restoration.
Keywords: OCT, stereo microscope, nano composites, marginal integrity.