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M. J. C. Rocha - One of the best experts on this subject based on the ideXlab platform.

  • ex vivo evaluation of the capacity of the tri auto zx to locate the Apical Foramen during root canal retreatment
    International Endodontic Journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P < 0.05) between the means of the differences between DL/EL1 (−0.36 mm) and DL/EL2 (−0.04 mm). Conclusion  The Tri Auto ZX was accurate to ±0.5 mm in more than 80% of teeth following removal of root fillings.

  • Ex vivo evaluation of the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment.
    International endodontic journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P 

Mara Cristina Santos Felippe - One of the best experts on this subject based on the ideXlab platform.

  • Ex vivo evaluation of the ability of the ROOT ZX II to locate the Apical Foramen and to control the Apical extent of rotary canal instrumentation.
    International endodontic journal, 2008
    Co-Authors: Wilson Tadeu Felippe, Mara Cristina Santos Felippe, J. Reyes Carmona, F. C. I. Crozoé, B. B. Alvisi
    Abstract:

    Aim  To evaluate the capacity of the ROOT ZX II to locate the Apical Foramen and to control the Apical extent of rotary instrumentation. Methodology  Sixty-five extracted human single rooted teeth were selected and measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the major Foramen (direct length, DL). The teeth were then measured electronically (EL1) with the ROOT ZX II when used passively, that is without rotation. To test the auto reverse function, the root canals were instrumented with nickel titanium rotary instruments. Instrumentation was carried out Apically until rotation was reversed by the automatic Apical reverse (AAR) function at different levels (2, 1 and 0.5). The instrumented length at each level was measured and registered as AAR2, AAR1 and AAR0.5, respectively. After instrumentation, a second passive electronic measurement was conducted and noted as electronic length 2 (EL2). All measurements were expressed in millimetres with accuracy set to 0.5 mm. Percentages of acceptable measurements for each electronic reading were calculated and compared using the proportions test. The Wilcoxon’s signed rank test was used to compare the differences between DL/EL1 and DL/EL2, and to compare EL2 with the different AAR measurements. The critical value of statistical significance was 5%. Results  EL1 and EL2 measurements were coincident to DL in 56 (86%) and 54 (83%) of the cases, respectively. The proportions test showed no statistically significant difference between these percentages (P > 0.05). The Wilcoxon’s signed rank test did not show any differences (P > 0.05) when comparing the mean difference between DL with EL1 (0.03) and DL with EL2 (0.10). Statistically significant differences were observed when comparing EL2 with AAR2 and with AAR1. Conclusions  The ROOT ZX II reliably located the major Apical Foramen, but was not an accurate method for controlling the Apical extent of rotary instrumentation. Rotary instrumentation with the automatic Apical reverse feature was always closer to the Foramen than expected.

  • ex vivo evaluation of the capacity of the tri auto zx to locate the Apical Foramen during root canal retreatment
    International Endodontic Journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P < 0.05) between the means of the differences between DL/EL1 (−0.36 mm) and DL/EL2 (−0.04 mm). Conclusion  The Tri Auto ZX was accurate to ±0.5 mm in more than 80% of teeth following removal of root fillings.

  • Ex vivo evaluation of the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment.
    International endodontic journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P 

  • In vitro evaluation of an audiometric device in locating the Apical Foramen of teeth.
    Endodontics & dental traumatology, 1994
    Co-Authors: Mara Cristina Santos Felippe, I. J. Soares
    Abstract:

    A new audiometric device to determine the location of the Apical Foramen of teeth undergoing endodontic treatment according to "the relative value method" was tested in in vitro experiments. In 96.5% of the 350 human teeth used in the experiment, the location of the Apical Foramen was determined within acceptable limits (0-0.5 mm). In 60 teeth, where the measurements were based on an intermittent audio signal, a point about 1 mm short of the Apical Foramen was located. The results were considered promising and a clinical evaluation of the device will be carried out.

Wilson Tadeu Felippe - One of the best experts on this subject based on the ideXlab platform.

  • Ex vivo evaluation of the ability of the ROOT ZX II to locate the Apical Foramen and to control the Apical extent of rotary canal instrumentation.
    International endodontic journal, 2008
    Co-Authors: Wilson Tadeu Felippe, Mara Cristina Santos Felippe, J. Reyes Carmona, F. C. I. Crozoé, B. B. Alvisi
    Abstract:

    Aim  To evaluate the capacity of the ROOT ZX II to locate the Apical Foramen and to control the Apical extent of rotary instrumentation. Methodology  Sixty-five extracted human single rooted teeth were selected and measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the major Foramen (direct length, DL). The teeth were then measured electronically (EL1) with the ROOT ZX II when used passively, that is without rotation. To test the auto reverse function, the root canals were instrumented with nickel titanium rotary instruments. Instrumentation was carried out Apically until rotation was reversed by the automatic Apical reverse (AAR) function at different levels (2, 1 and 0.5). The instrumented length at each level was measured and registered as AAR2, AAR1 and AAR0.5, respectively. After instrumentation, a second passive electronic measurement was conducted and noted as electronic length 2 (EL2). All measurements were expressed in millimetres with accuracy set to 0.5 mm. Percentages of acceptable measurements for each electronic reading were calculated and compared using the proportions test. The Wilcoxon’s signed rank test was used to compare the differences between DL/EL1 and DL/EL2, and to compare EL2 with the different AAR measurements. The critical value of statistical significance was 5%. Results  EL1 and EL2 measurements were coincident to DL in 56 (86%) and 54 (83%) of the cases, respectively. The proportions test showed no statistically significant difference between these percentages (P > 0.05). The Wilcoxon’s signed rank test did not show any differences (P > 0.05) when comparing the mean difference between DL with EL1 (0.03) and DL with EL2 (0.10). Statistically significant differences were observed when comparing EL2 with AAR2 and with AAR1. Conclusions  The ROOT ZX II reliably located the major Apical Foramen, but was not an accurate method for controlling the Apical extent of rotary instrumentation. Rotary instrumentation with the automatic Apical reverse feature was always closer to the Foramen than expected.

  • ex vivo evaluation of the capacity of the tri auto zx to locate the Apical Foramen during root canal retreatment
    International Endodontic Journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P < 0.05) between the means of the differences between DL/EL1 (−0.36 mm) and DL/EL2 (−0.04 mm). Conclusion  The Tri Auto ZX was accurate to ±0.5 mm in more than 80% of teeth following removal of root fillings.

  • Ex vivo evaluation of the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment.
    International endodontic journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P 

Wim Laureys - One of the best experts on this subject based on the ideXlab platform.

  • the critical Apical diameter to obtain regeneration of the pulp tissue after tooth transplantation replantation or regenerative endodontic treatment
    Journal of Endodontics, 2013
    Co-Authors: Wim Laureys, Claude Cuvelier, Luc Dermaut, Guy A M De Pauw
    Abstract:

    Abstract Introduction Regeneration of pulp-like tissue in the pulp chamber after tooth transplantation, replantation, or in regenerative endodontic treatment is only possible if the Apical Foramen is open. According to the literature, the success of regeneration decreases considerably if the Foramen is smaller than 1 mm when measured on radiographs. The aim of this study was to study histologically the relation between the width of the Apical Foramen and regeneration of tissue in the pulp chamber after autotransplantation. Methods Fifteen single-rooted mature teeth of 3 adult beagle dogs were used. All experimental teeth were extracted and underwent apicoectomy. The teeth were photographed from the Apical side, and the width of the Foramen was calculated. The Foramen width ranged from 0.24–1.09 mm. All teeth were replanted in infraocclusion. The observation period was 90 days after transplantation. Results The 10 teeth with the smallest Apical diameter, ranging between 0.24 and 0.53 mm, showed vital tissue in at least one third of the pulp chamber. The 6 most successful teeth showing vital tissue in the entire pulp chamber had an Apical diameter between 0.32 and 0.65 mm, and 80% of the experimental teeth with a diameter varying between 1.09 and 0.31 mm showed vital tissue in at least one third of the pulp chamber 90 days after transplantation. Conclusions The size of the Apical Foramen seems not to be the all decisive factor for successful revascularization and ingrowth of new tissue after transplantation. The minimum width of the Apical Foramen has not been determined, but a size smaller than 1 mm does not prevent revascularization and ingrowth of vital tissue. In this animal study an Apical Foramen of 0.32 mm did not prevent ingrowth of new tissue in two-thirds of the pulp chamber 90 days after transplantation.

  • the critical Apical diameter to obtain regeneration of the pulp tissue after tooth transplantation replantation or regenerative endodontic treatment
    Journal of Endodontics, 2013
    Co-Authors: Wim Laureys, Claude Cuvelier, Luc Dermaut, Guy De Pauw
    Abstract:

    Introduction Regeneration of pulp-like tissue in the pulp chamber after tooth transplantation, replantation, or in regenerative endodontic treatment is only possible if the Apical Foramen is open. According to the literature, the success of regeneration decreases considerably if the Foramen is smaller than 1 mm when measured on radiographs. The aim of this study was to study histologically the relation between the width of the Apical Foramen and regeneration of tissue in the pulp chamber after autotransplantation.

Ana Maria Hecke Alves - One of the best experts on this subject based on the ideXlab platform.

  • ex vivo evaluation of the capacity of the tri auto zx to locate the Apical Foramen during root canal retreatment
    International Endodontic Journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P < 0.05) between the means of the differences between DL/EL1 (−0.36 mm) and DL/EL2 (−0.04 mm). Conclusion  The Tri Auto ZX was accurate to ±0.5 mm in more than 80% of teeth following removal of root fillings.

  • Ex vivo evaluation of the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment.
    International endodontic journal, 2005
    Co-Authors: Ana Maria Hecke Alves, Mara Cristina Santos Felippe, Wilson Tadeu Felippe, M. J. C. Rocha
    Abstract:

    Aim  To evaluate ex vivo the capacity of the Tri Auto ZX to locate the Apical Foramen during root canal retreatment. Methodology  The root canals of 62 maxillary and mandibular canines were prepared to a length 1 mm short of the Apical Foramen, to an Apical size 35 using 1% sodium hypochlorite as an irrigant. Once prepared, the length of each tooth was measured directly using a size 15 K-Flexofile introduced in the canal until the tip was visible at the Apical Foramen. After the file was removed, its length was recorded to a precision of 0.01 mm using a calliper. These direct lengths (DL) became the ‘gold standard’ for comparison with the electronic lengths (EL) derived from the Tri Auto ZX. After direct measurement, the tooth was measured electronically (EL1) and the canals were filled using lateral condensation of gutta-percha cones and sealer. Seven days later the root filling was removed using solvent, Gates-Glidden burs, and K-files, and new electronic lengths determined (EL2). The electronic lengths (EL1 and EL2) were compared with the DL, and the differences were analysed statistically using the proportions test and Student's t-test. Results  At a tolerance limit of ±0.5 mm, EL1 coincided with the DL in 76% of cases. Lengths obtained in the presence of remnant of filling material (EL2) coincided in 81% of cases. The proportions test used to compare these percentages showed no statistically significant difference between EL1 and EL2 (P > 0.05). The Student's t-test revealed a statistically significant difference (P