Endo Irrigants, Amalgam safty and Apex locators
Effect of root canal irrigants on cervical dentine permeability to hydrogen peroxide
P. Surapipongpuntr, W. Duangcharee, S. Kwangsamai & A. Ekka
Copyright © 2008 International Endodontic Journal -IEJ Aug 2008
Aim To examine the effects of various root canal irrigants on cervical dentine permeability by monitoring the diffusion of hydrogen peroxide (H2O2).
Methodology Sixty cervical dentine discs were prepared from human third molar teeth. After removal of enamel and cementum, the outer dentine surface was etched with 17% ethylenediamine tetraacetic acid (EDTA) for 1 min. The dentine discs were randomly assigned to five groups according to the irrigant used: A, saline solution; B, 2.5% sodium hypochlorite solution (NaOCl); C, 5% NaOCl; D, 17% EDTA and 2.5% NaOCl; E, 17% EDTA and 5% NaOCl. After irrigation on the inner dentine surface with the various solutions, the diffusion of 30% H2O2 was evaluated through each disc using a plastic-split chamber. H2O2 was applied to the inner-side chamber, while the outer-side chamber was filled with de-ionised water. After 30 min of application of H2O2, the solution in the outer-side chamber was collected to determine the concentration of H2O2 using a spectrophotometer.
Results The penetration of H2O2 through dentine in group E was significantly highest, followed by groups D, C, B and A respectively (one-way anova, P < style="font-weight: bold;">Conclusions Among the irrigants used, 17% EDTA and 5% NaOCl had the greatest effect in increasing dentinal permeability to H2O2.
It is technically illegal to do endo without using Electronic Apex Locator (EAL) for more CLICK HERE.
Accuracies of seven different apex locators under various conditions, Triple O, Aug 2008
Objectives. The purpose of this study was to evaluate the accuracies of 7 different frequency-dependent electronic
apex locators (EALs) on using different irrigants in the root canal.
Study design. Root canal lengths were measured with 7 different EALs in 40 extracted human teeth embedded in an alginate model after canal preparation and compared with the actual canal length measurements taken before embedding the teeth in alginate. The EALs used were Apex Finder 7005, Apit, Bingo-1020, e-Magic Finder, ProPex, Root ZX, and SmarPex. Measurements were taken with the canal dry, and saturated sequentially with 5.25% NaOCl, saline, 0.1% chlorhexidine, and 15% EDTA. Data were analyzed with 1-way ANOVA and Tukey’s studentized range test.
Results. There were some differences in accuracies among EALs; however, some of the differences were not statistically significant. All EALs were less accurate when the apical foramen size was larger.
Conclusion. Within the limitations of the present study, most of the EALs tested can be considered reliable in the presence of various root canal irrigants and varying sizes of the apical foramen.
Note:Root ZX is considered the Gold standard.
Is it Ethical to Replace Amalam Fillings
Millions of people have them in their mouths, yet their widespread use in treating cavities is one of the more contentious issues in dentistry. So-called silver amalgam fillings contain about 50 percent mercury, with the remaining material made from a powder of silver, tin, zinc, and copper. Some experts are concerned that the release of microscopic amounts of mercury vapor—a consequence of chewing food, grinding teeth, and exposing the fillings to hot substances—might cause neurological problems or kidney damage, particularly in sensitive populations, such as children and pregnant women. Others, including the American Dental Association, say the safety data are reassuring. The Food and Drug Administration is taking a closer look.
Numerous dentists and health clinics advertising on the Internet offer patients a chance to remove their fillings and replace them with alternative materials. Some even contend that serious health problems, including neurological disorders, can be cured by the removal of amalgam fillings. Others sell vitamin supplements that supposedly ameliorate any harm from mercury exposure. No studies have confirmed these claims, however. In fact, most experts do not recommend removing amalgam fillings and replacing them with composite resin or other material, since doing so can cause serious harm to teeth if not done properly.
Full story here
P. Surapipongpuntr, W. Duangcharee, S. Kwangsamai & A. Ekka
Copyright © 2008 International Endodontic Journal -IEJ Aug 2008
Aim To examine the effects of various root canal irrigants on cervical dentine permeability by monitoring the diffusion of hydrogen peroxide (H2O2).
Methodology Sixty cervical dentine discs were prepared from human third molar teeth. After removal of enamel and cementum, the outer dentine surface was etched with 17% ethylenediamine tetraacetic acid (EDTA) for 1 min. The dentine discs were randomly assigned to five groups according to the irrigant used: A, saline solution; B, 2.5% sodium hypochlorite solution (NaOCl); C, 5% NaOCl; D, 17% EDTA and 2.5% NaOCl; E, 17% EDTA and 5% NaOCl. After irrigation on the inner dentine surface with the various solutions, the diffusion of 30% H2O2 was evaluated through each disc using a plastic-split chamber. H2O2 was applied to the inner-side chamber, while the outer-side chamber was filled with de-ionised water. After 30 min of application of H2O2, the solution in the outer-side chamber was collected to determine the concentration of H2O2 using a spectrophotometer.
Results The penetration of H2O2 through dentine in group E was significantly highest, followed by groups D, C, B and A respectively (one-way anova, P < style="font-weight: bold;">Conclusions Among the irrigants used, 17% EDTA and 5% NaOCl had the greatest effect in increasing dentinal permeability to H2O2.
It is technically illegal to do endo without using Electronic Apex Locator (EAL) for more CLICK HERE.
Accuracies of seven different apex locators under various conditions, Triple O, Aug 2008
Objectives. The purpose of this study was to evaluate the accuracies of 7 different frequency-dependent electronic
apex locators (EALs) on using different irrigants in the root canal.
Study design. Root canal lengths were measured with 7 different EALs in 40 extracted human teeth embedded in an alginate model after canal preparation and compared with the actual canal length measurements taken before embedding the teeth in alginate. The EALs used were Apex Finder 7005, Apit, Bingo-1020, e-Magic Finder, ProPex, Root ZX, and SmarPex. Measurements were taken with the canal dry, and saturated sequentially with 5.25% NaOCl, saline, 0.1% chlorhexidine, and 15% EDTA. Data were analyzed with 1-way ANOVA and Tukey’s studentized range test.
Results. There were some differences in accuracies among EALs; however, some of the differences were not statistically significant. All EALs were less accurate when the apical foramen size was larger.
Conclusion. Within the limitations of the present study, most of the EALs tested can be considered reliable in the presence of various root canal irrigants and varying sizes of the apical foramen.
Note:Root ZX is considered the Gold standard.
Is it Ethical to Replace Amalam Fillings
Millions of people have them in their mouths, yet their widespread use in treating cavities is one of the more contentious issues in dentistry. So-called silver amalgam fillings contain about 50 percent mercury, with the remaining material made from a powder of silver, tin, zinc, and copper. Some experts are concerned that the release of microscopic amounts of mercury vapor—a consequence of chewing food, grinding teeth, and exposing the fillings to hot substances—might cause neurological problems or kidney damage, particularly in sensitive populations, such as children and pregnant women. Others, including the American Dental Association, say the safety data are reassuring. The Food and Drug Administration is taking a closer look.
Numerous dentists and health clinics advertising on the Internet offer patients a chance to remove their fillings and replace them with alternative materials. Some even contend that serious health problems, including neurological disorders, can be cured by the removal of amalgam fillings. Others sell vitamin supplements that supposedly ameliorate any harm from mercury exposure. No studies have confirmed these claims, however. In fact, most experts do not recommend removing amalgam fillings and replacing them with composite resin or other material, since doing so can cause serious harm to teeth if not done properly.
Full story here
posted by Healthmantra at
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