Sodium Perborate

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William A. Walker - One of the best experts on this subject based on the ideXlab platform.

  • Microleakage of TERM used with Sodium Perborate/water and Sodium Perborate/superoxol in the “walking bleach” technique
    Journal of Endodontics, 1998
    Co-Authors: Rodney M. Waite, David L. Carnes, William A. Walker
    Abstract:

    This study compared the sealing ability of TERM as an interim restoration for the “walking bleach” technique when using either Sodium Perborate/water or Sodium Perborate/superoxol. Thirty-three extracted maxillary premolars were restored with TERM after placing either a cotton pellet (control), a paste of Sodium Perborate and water, or a paste of Sodium Perborate and superoxol in the chamber. Microleakage was assessed at 24 h, 8 days, and 15 days using a fluid filtration method. Statistical analysis revealed both “walking bleach” groups had significantly higher numbers of teeth demonstrating microleakage than the control group. There was no statistically significant difference in microleakage between the two “walking bleach” groups. The results of this study indicated that the temporary restorative material, TERM, provided an unsatisfactory seal when used with either walking bleach technique. When used over a cotton pellet, TERM provided an excellent seal.

  • microleakage of term used with Sodium Perborate water and Sodium Perborate superoxol in the walking bleach technique
    Journal of Endodontics, 1998
    Co-Authors: Rodney M. Waite, David L. Carnes, William A. Walker
    Abstract:

    This study compared the sealing ability of TERM as an interim restoration for the “walking bleach” technique when using either Sodium Perborate/water or Sodium Perborate/superoxol. Thirty-three extracted maxillary premolars were restored with TERM after placing either a cotton pellet (control), a paste of Sodium Perborate and water, or a paste of Sodium Perborate and superoxol in the chamber. Microleakage was assessed at 24 h, 8 days, and 15 days using a fluid filtration method. Statistical analysis revealed both “walking bleach” groups had significantly higher numbers of teeth demonstrating microleakage than the control group. There was no statistically significant difference in microleakage between the two “walking bleach” groups. The results of this study indicated that the temporary restorative material, TERM, provided an unsatisfactory seal when used with either walking bleach technique. When used over a cotton pellet, TERM provided an excellent seal.

Srinivasan Chandrasekaran - One of the best experts on this subject based on the ideXlab platform.

Rodney M. Waite - One of the best experts on this subject based on the ideXlab platform.

  • Microleakage of TERM used with Sodium Perborate/water and Sodium Perborate/superoxol in the “walking bleach” technique
    Journal of Endodontics, 1998
    Co-Authors: Rodney M. Waite, David L. Carnes, William A. Walker
    Abstract:

    This study compared the sealing ability of TERM as an interim restoration for the “walking bleach” technique when using either Sodium Perborate/water or Sodium Perborate/superoxol. Thirty-three extracted maxillary premolars were restored with TERM after placing either a cotton pellet (control), a paste of Sodium Perborate and water, or a paste of Sodium Perborate and superoxol in the chamber. Microleakage was assessed at 24 h, 8 days, and 15 days using a fluid filtration method. Statistical analysis revealed both “walking bleach” groups had significantly higher numbers of teeth demonstrating microleakage than the control group. There was no statistically significant difference in microleakage between the two “walking bleach” groups. The results of this study indicated that the temporary restorative material, TERM, provided an unsatisfactory seal when used with either walking bleach technique. When used over a cotton pellet, TERM provided an excellent seal.

  • microleakage of term used with Sodium Perborate water and Sodium Perborate superoxol in the walking bleach technique
    Journal of Endodontics, 1998
    Co-Authors: Rodney M. Waite, David L. Carnes, William A. Walker
    Abstract:

    This study compared the sealing ability of TERM as an interim restoration for the “walking bleach” technique when using either Sodium Perborate/water or Sodium Perborate/superoxol. Thirty-three extracted maxillary premolars were restored with TERM after placing either a cotton pellet (control), a paste of Sodium Perborate and water, or a paste of Sodium Perborate and superoxol in the chamber. Microleakage was assessed at 24 h, 8 days, and 15 days using a fluid filtration method. Statistical analysis revealed both “walking bleach” groups had significantly higher numbers of teeth demonstrating microleakage than the control group. There was no statistically significant difference in microleakage between the two “walking bleach” groups. The results of this study indicated that the temporary restorative material, TERM, provided an unsatisfactory seal when used with either walking bleach technique. When used over a cotton pellet, TERM provided an excellent seal.

Claus Löst - One of the best experts on this subject based on the ideXlab platform.

  • Radicular penetration of hydrogen peroxide during intra‐coronal bleaching with various forms of Sodium Perborate
    International Endodontic Journal, 1994
    Co-Authors: R. Weiger, A. Kuhn, Claus Löst
    Abstract:

    Summary The development of external cervical root resorption following internal bleaching of discoloured pulpless teeth is associated with the use of hydrogen peroxide. The aim of the study was to determine radicular penetration of hydrogen peroxide following intracoronal bleaching with various forms of Sodium Perborate, 63 extracted human incisors were root filled and stained artificially. Standardized cementum defects were created on the mesial and distal aspects of the root directly below the cemento-enamel junction (CEJ). Using the walking bleach technique all teeth were bleached for a 6-day period, with replacement of the bleaching paste after days 1 and 3. Sodium Perborate monohydrate (MH), trihydrate (TRH) or tetrahydrate (TH) was mixed with H2O2 or H2O and subsequently placed intracoronatly 1 mm below the labial CEJ. The teeth were divided into six groups: I. MH + H2O2(30%)(n=12); II. TRH + H2O2(30%)(n=12); III. TH + H2O2(30%)(n=12); IV. TH + H2O(n=12); V. TH + H2O gel(n=12); VI. no bleaching paste (n= 3). At baseline and at days 1, 3 and 6 the amount of H2O2 taken up from the surrounding medium of each root was indirectly recorded and calculated as p.p.m. Almost all teeth of the experimental groups showed leakage of hydrogen peroxide compared to those of the control group. The radicular penetration of hydrogen peroxide was significantly higher in teeth of groups I and III than in those of groups IV and V (P≤ 0.001). In conclusion, the amount of hydrogen peroxide leakage depends, among other factors, on the form of Sodium Perborate used. The risk of post-bleaching cervical root resorption may be diminished by using Sodium Perborate tetrahydrate in conjunction with H2O.

  • radicular penetration of hydrogen peroxide during intra coronal bleaching with various forms of Sodium Perborate
    International Endodontic Journal, 1994
    Co-Authors: R. Weiger, A. Kuhn, Claus Löst
    Abstract:

    Summary The development of external cervical root resorption following internal bleaching of discoloured pulpless teeth is associated with the use of hydrogen peroxide. The aim of the study was to determine radicular penetration of hydrogen peroxide following intracoronal bleaching with various forms of Sodium Perborate, 63 extracted human incisors were root filled and stained artificially. Standardized cementum defects were created on the mesial and distal aspects of the root directly below the cemento-enamel junction (CEJ). Using the walking bleach technique all teeth were bleached for a 6-day period, with replacement of the bleaching paste after days 1 and 3. Sodium Perborate monohydrate (MH), trihydrate (TRH) or tetrahydrate (TH) was mixed with H2O2 or H2O and subsequently placed intracoronatly 1 mm below the labial CEJ. The teeth were divided into six groups: I. MH + H2O2(30%)(n=12); II. TRH + H2O2(30%)(n=12); III. TH + H2O2(30%)(n=12); IV. TH + H2O(n=12); V. TH + H2O gel(n=12); VI. no bleaching paste (n= 3). At baseline and at days 1, 3 and 6 the amount of H2O2 taken up from the surrounding medium of each root was indirectly recorded and calculated as p.p.m. Almost all teeth of the experimental groups showed leakage of hydrogen peroxide compared to those of the control group. The radicular penetration of hydrogen peroxide was significantly higher in teeth of groups I and III than in those of groups IV and V (P≤ 0.001). In conclusion, the amount of hydrogen peroxide leakage depends, among other factors, on the form of Sodium Perborate used. The risk of post-bleaching cervical root resorption may be diminished by using Sodium Perborate tetrahydrate in conjunction with H2O.

  • In vitro comparison of various types of Sodium Perborate used for intracoronal bleaching of discolored teeth
    Journal of Endodontics, 1994
    Co-Authors: R. Weiger, Achim Kuhn, Claus Löst
    Abstract:

    Fifty-eight extracted incisors were artificially stained to compare the efficacy of Sodium Perborate preparations used for intracoronal bleaching. All teeth were bleached for a 6-day period and the bleaching pastes replaced at days 1 and 3 (walking bleach technique). Sodium Perborate-monohydrate, trihydrate, or tetrahydrate in conjunction with 30% H2O2 as well as tetrahydrate, either mixed with H2O or prepared as an experimental gel, were placed intracoronally at a level of 1-mm below the vestibular cementoenamel junction. Standardized slides were used to evaluate the color changes during bleaching. Success rates between 46 and 77% could be achieved, but no significant differences in final bleaching results between any of the Sodium Perborate types were observed. The use of the experimental gel resulted in comparable esthetic results (54%), although the portion of tetrahydrate in the gel was lower than that of the other preparations. In contrast to general recommendations that bleaching agents be left for 3 to 7 days in the access cavity before replacement, shorter bleaching intervals did not seem to affect the success.

  • Effect of various types of Sodium Perborate on the pH of bleaching agents
    Journal of Endodontics, 1993
    Co-Authors: R. Weiger, Achim Kuhn, Claus Löst
    Abstract:

    Time-dependent changes in the pH value of various types of Sodium Perborate solutions used as bleaching agents were evaluated. Sodium Perborate-monohydrate (MH), Sodium Perborate-trihydrate (TRH), and Sodium Perborate-tetrahydrate are available. Each Perborate was mixed with 10%, 15%, or 30% fresh hydrogen peroxide or with bidistilled water in a powder to liquid ratio of 2 g:1 ml, respectively. The pH values were recorded at baseline and after 1 h, 1 day, 3 days, and 7 days, respectively. At baseline the pH values of MH, TRH, and tetrahydrate in conjunction with 30% H 2 O 2 were 8.7, 7.0, and 7.5, respectively. The pH increased significantly with decreasing concentrations of H 2 O 2 . For TRH, MH, and tetrahydrate mixed with bidistilled water more alkaline values were measured at baseline and after 1 h. Due to solidification of the samples, the pH could not be determined for MH starting day 1 and for TRH starting day 3. In conclusion, the pH of bleaching pastes depends on the content of water of crystallization in Sodium Perborate, H 2 O 2 concentration, and time of measurement. The bulk of the mixtures recorded reached alkaline pH values of 10 to 11. It is recommended that the pH of the mixture being used be checked to avoid potential postbleaching root resorption.

Shridhar Bhat - One of the best experts on this subject based on the ideXlab platform.

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