Composite resins are developed as restorative materials to improve esthetics and mechanical properties. To improve the physical properties of resin material, resin filler have to be added. However, no imaging method is adopted for resin filler distribution. Optical coherence tomography (OCT) is a optical imaging technique to delineate microscopic structures within biological tissue. The OCT application to dental composites resin and its filler is not described yet. So, this new and advanced optical method is needed for clinical application for evaluation of dental composite resin. To analyze the spatial distribution of dental composite resin and to evaluate the resin restoration in cavity, frequency domain optical coherence tomography (FD-OCT) was used for their analysis. Resin restored tooth was prepared. For morphological observation, serially sectioned teeth, conventional X-ray taking and micro computed-tomography (CT) images were compared with OCT images. The experiment has done to evaluate the success of the resin restoration using 3 dimensional structure OCT image. In this research, OCT is evaluated as a new technique to image resin restoration. The evaluation of resin restored tooth was performed by OCT. Inappropriate restoration such as marginal adaptation, large porosities, internal integrity and poor contour could be detected. Resin filler also could be checked by OCT. The distribution, number, regularity and size of resin filler can be differentiated from several commercial products. Considering the characteristics of the OCT, it can be used to evaluate the defects of resin restoration, resin filler distribution, and internal integrity between resin material and tooth structure. The OCT can be considered to be a new and advanced method for the evaluation of resin restorations.

Ⅰ. INTRODUCTION
 Ⅱ. MATERIALS & METHODS
  1. Instrumentation
  2. Specimen preparation
  3. Viewing conditions
 Ⅲ. RESULTS
 Ⅳ. DISCUSSION
 Ⅴ. CONCLUSION
 Ⅵ. REFERENCE

• Sang Mi Jeon(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 전상미
• Young Hee Lee(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 이영희
• Hyeong Joon Ji(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 지형준
• Hye Joung Cho(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 조혜중
• Seo Jin Kim(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 김서진
• Hye Eun Kim(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 김혜은
• SUN QIAOCHU(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University)
• Kyu Hyeon Ahn(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 안규현
• Hong Ran Choi(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 최홍란
• Ok Joon Kim(Dental Research Institute, Department of Oral Pathology, School of Dentistry, Chonnam National University) | 김옥준 Corresponding Author