1. JOSEPH GINTING - Postgraduate Program in Prosthodontics, Faculty of Dentistry, Universitas Sumatera Utara, Medan,
20155, Indonesia.
2. CHAIRUNNISA R - Lecturer, Department of Prosthodontics, Faculty of Dentistry, Universitas Sumatera Utara, Medan,
20155, Indonesia.
3. ISMET DANIAL NASUTION - Lecturer, Department of Prosthodontics, Faculty of Dentistry, Universitas Sumatera Utara, Medan,
20155, Indonesia.
4. H AGUSNAR - Lecturer, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas
Sumatera Utara, Medan, 20155, Indonesia.
Shade matching in tooth restoration can be done with two methods, visual method using shade guide and instrumental method using colorimeter or spectrophotometer, both of this methods possess disadvantages that can cause bias in the shade matching result, therefore a new method using digital photography was proposed. The camera that is generally used in digital photography is DSLR camera, but this camera has drawbacks, such as the size of the camera which is large and heavy making it difficult to operate. Other types of digital cameras that are growing rapidly nowadays are mirrorless and smart phone. These two cameras are smaller, lighter, and easier to operate. Due to various parameters that must be standardized in digital photography method, achieving a consistent and adequate photograph is difficult, therefore a corlor calibration method is needed before shade matching are carried out. The color calibration method that can be used in digital photography method is by using cross-polarization filter with and without grey card. The purpose of this study was to determine the effect of mirrorless and smart phone camera with color calibration method using crosspolarization filter with and without grey card on the accuracy of shade matching using digital photography. The research sample was 9 tabs from N-D shade guid. The sample was photographed using a DSLR camera with cross-polarization filter and grey card as the color calibration method, the shade tabs L*a*b* was measured using computer software. The sample group was divided into two groups based on the type of the camera, namely mirrorless and smart phone, then each sample group was further divided into two groups based on the color calibration method, using cross-polarization filter with and without grey card. The value of shade matching accuracy (∆E) was obtained by comparing the L*a*b* value from the control group with the sample group. The effect of camera type and color calibration method was tested using paired T-test. The result showed that the most accurate color method was in the smart phone camera type group with color calibration method using crosspolarization filter with grey card (1,750,30) and the least accurate was in the smart phone camera type group with color calibration method using cross-polarization filter without grey card (27,031,19). Paired T-test result showed that there is an effect of the mirrorless and smart phone camera type with color calibration method using cross-polarization filter and grey card on the shade matching accuracy using digital photography with p value p=0,008 (P<0,05), there is an effect of the mirrorless and smart phone camera type with color calibration method using cross-polarization filter without grey card on the shade matching accuracy using digital photography with p value p=0,0001 (P<0,05). There is an effect of the color calibration method using cross-polarization filter with and without grey card using a mirrorless camera on the shade matching accuracy using digital photography with p value p=0,0001 (P<0,05). There is an effect of the color calibration method using cross-polarization filter with and without grey card using a smart phone camera on the shade matching accuracy using digital photography with p value p=0,0001 (P<0,05). The best shade matching methods was the smart phone camera with color calibration method using cross-polarization filter and grey card, the shade matching accuracy of the mirrorless camera when accompanied with color calibration method using a cross-polarization filter and a grey card is clinically acceptable, therefore it is also recommended for clinical shade matching procedure.
Shade Matching, Digital Photography, Color Calibration Method.