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Citations to this article as recorded by  

• Effect of preference drinks on tooth color reduction after tooth bleaching: A 12-momth follow-up study
  Hyo Jin Goo, Min Jeong Cho, Yun Sook Jung, Ji Hye Kim, Fan Dong, Keun Bae Song
  Journal of Korean Academy of Oral Health.2016; 40(1): 55.     CrossRef
• Development of a Piezoelectric Ultrasonic Tooth-whitening Apparatus
  Young-Jin Lee, Jong-Hoo Paik, Jeong-Bae Lee, Seung-Jae Choi
  Transactions on Electrical and Electronic Materials.2013; 14(5): 268.     CrossRef

This study aimed to assess the influence of different cross-sectional area on the cyclic fatigue fracture of Ni-Ti rotary files using a fatigue tester incorporating cyclical axial movement. Six brands of Ni-Ti rotary files (ISO 30 size with .04 taper) of 10 each were tested: Alpha system (KOMET), HeroShaper (MicroMega), K3 (SybronEndo), Mtwo (VDW), NRT (Mani), and ProFile (Dentsply). A fatigue-tester (Denbotix) was designed to allow cyclic tension and compressive stress on the tip of the instrument. Each file was mounted on a torque controlled motor (Aseptico) using a 1:20 reduction contra-angle and was rotated at 300 rpm with a continuous, 6 mm axial oscillating motion inside an artificial steel canal. The canal had a 60° angle and a 5 mm radius of curvature. Instrument fracture was visually detected and the time until fracture was recorded by a digital stop watch. The data were analyzed statistically. Fractographic analysis of all fractured surfaces was performed to determine the fracture modes using a scanning electron microscope. Cross-sectional area at 3 mm from the tip of 3 unused Ni-Ti instruments for each group was calculated using Image-Pro Plus (Imagej 1.34n, NIH). Results showed that NRT and ProFile had significantly longer time to fracture compared to the other groups (p < .05). The cross-sectional area was not significantly associated with fatigue resistance. Fractographycally, all fractured surfaces demonstrated a combination of ductile and brittle fracture. In conclusion, there was no significant relationship between fatigue resistance and the cross-sectional area of Ni-Ti instruments under experimental conditions.

This clinical study evaluated the whitening effect and safety of polymer based-pen type BlancTis Forte (NIBEC) containing 8.3% carbamide peroxide. Twenty volunteers used the BlancTis Forte whitening agent for 2 hours twice a day for 4 weeks. As a control, Whitening Effect Pen (LG) containing 3% hydrogen peroxide was used by 20 volunteers using the same protocol. The change in shade (ΔE^*, color difference) was measured using Shadepilot™ (DeguDent) before, during, and after bleaching (2 weeks, 4 weeks, and post-bleaching 4 weeks). A clinical examination for any side effects (tooth hypersensitivity or soft tissue complications) was also performed at each check-up. The following results were obtained.

1. Both the experimental and control groups displayed a noticeable change in shade (ΔE) of over 2. No significant differences were found between the two groups (p > 0.05), implying that the two agents have a similar whitening effect.

2. The whitening effect was mainly due to changes in a and b values rather than in L value (brightness). The experimental group showed a significantly higher change in b value, thus yellow shade, than the control (p < 0.05).

3. None of the participants complained of tooth hypersensitivity or soft tissue complications, confirming the safety of both whitening agents.

Citations

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• Surface Damage and Bleaching Effect according to the Application Type of Home Tooth Bleaching Applicants
  Na-Yeoun Tak, Do-Seon Lim, Hee-Jung Lim, Im-Hee Jung
  Journal of Dental Hygiene Science.2020; 20(4): 252.     CrossRef
• Efficacy of a self - applied paint - on whitening gel combined with wrap
  Soo-Yeon Kim, Jae-Hyun Ahn, Ji-Young Kim, Jin-Woo Kim, Se-Hee Park, Kyung-Mo Cho
  Journal of Dental Rehabilitation and Applied Science.2018; 34(3): 175.     CrossRef