EFFICIENCY OF DIFFERENT INTERNAL BLEACHING TECHNIQUES ON DISCOLORED TEETH: IN VITRO STUDY.

Dr. Sarah Sakr*

ABSTRACT

Purpose: The aim of this study was to evaluate the efficiency of walking, light, and laser bleaching on discolored teeth by TAP as it was applied internally. Methods: seventy extracted maxillary and mandibular permenant incisors were used. All the extrinsic stains and debris were removed using an ultrasonic scaler then the surfaces were polished by pumice and water. Access cavities were prepared in the specimens and irrigated, then the TAP was applied for 21 days. The samples were divided into control group(n=10), walking bleaching(n=20), light bleaching(n=20) and laser bleaching(n=20). Results: All groups showed significant discoloration (p<0.001) where the highest mean value was in the light group and the lowest was in the laser group. After bleaching all the groups showed significant difference from the discoloration but the highest was the light group where (p=0.014) then the laser and the lowest was the walking group. Conclusion: The light bleaching technique was the most effective technique among the three techniques.

Keywords: Triple antibiotics paste, walking bleaching, light bleaching, laser bleaching, spectrophotometer.