Sealing ability of dental amalgams as retrograde fillings in endodontic therapy

“…In the present study a combined in vitro-in vivo method as described by Tronstad et al was used (9). With this method straight roots from human teeth eould be used, and the root eanals were instrumented wide (size 80) and through the apical foramen so that standardized apical conditions could be created.…”

Section: Discussionmentioning

confidence: 99%

“…The 160 roots were then implanted subcutaneously in 5 rabbits in order to expose the materials to vital tissue aud tissue fluids (9). The rabbits were anesthetized with equal parts of Rompum (Xylazine.…”

Section: Methodsmentioning

confidence: 99%

In vivo sealing ability of calcium hydroxide‐containing root canal sealers

Barnett

Trope

Rooney

et al. 1989

Dental Traumatology

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It was the purpose of this study to determine the sealing ability of 2 commercially available calcium hydroxide-containing root canal sealers, CRCS and Sealapex. One hundred sixty single-rooted human teeth were used. The clinical crowns were removed and the roots were cleaned mechanically and by immersion for 24 h in 5% sodium hypochlorite. The root canals were then instrumented to size 80 at the apical foramen and the roots were sterilized by gamma-radiation. Under aseptic conditions the root canals were filled with a gutta-percha master cone size 70 and Sealapex (48 roots), CRCS (48 roots), and a zinc oxide-eugenol type sealer, Roth 801 (50 roots). The coronal aspects of the root canals were then sealed with zinc oxide-eugenol cement. In order to bring the roots and root filling materials in contact with tissue and tissue fluids, the roots were implanted subcutaneously in rabbits for 90 days and 1 year. Leakage as demonstrated by penetration of India ink was evaluated using a stereomicroscope. The best results were obtained with CRCS. Significantly less leakage occurred with both calcium hydroxide-containing sealers than with the traditional zinc oxide-eugenol sealer.

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“…A periapical surgery becomes the indicated therapeutic alternative 1 when all the resources of a retreatment are exhausted, in cases with presence of clinical signs and symptoms and the difficulty of achieving the ideal limit measure for the obturation because of anatomical processes or for previous iatrogenical procedures, or for calcified teeth, perforations and curved roots, intra-root pins which are very hard to be removed, 2 or even for contaminated root canals persistent to the conventional endodontic therapy with the maintenance of the harmful apical process. 3 Generally, failures of the apical surgeries have been related to the remaining microorganisms, their products and the organic fluids percolation of the root canal systems to the periapical region, being possible to penetrate the obturation interface due to the reduced sealing capacity of the retrofilling material, 4,5 or through the exposed dentinal tubules on the resection surface. 1,6 Such microorganisms are capable of being present in extraroot canal infections, 3,7 and to invade the periapical tissues.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Dentine Permeability after Apicectomy and Surface Treatment with 9.6 µm TEA CO₂and Er:YAG Laser Irradiation

Gouw-Soares¹,

Stabholz

Lage‐Marques

et al. 2004

Journal of Clinical Laser Medicine & Surgery

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Failure of apicectomies is generally attributed to dentine surface permeability as well as to the lack of an adequate marginal sealing of the retrofilling material, which allows the percolation of microorganisms and their products from the root canal system to the periodontal region, thus compromising periapical healing. The purpose of this study was to evaluate dentine and the marginal permeability after apicectomy and surface treatment with 9.6 micro m TEA CO(2) or Er:YAG 2.94 micro m laser irradiation. Sixty-five single rooted human endodontically treated teeth were divided into five experimental groups: group I (control), apicectomy with high speed bur; group II, similar procedure to that of group I, followed by dentinal surface treatment with 9.6 micro m CO(2) laser; group III, similar procedure to group I followed by dentinal surface treatment with Er:YAG laser 2.94 micro m; group IV, apicectomy and surface treatment with CO(2) 9.6 micro m laser; and group V, apicectomy and surface treatment with Er:YAG laser 2.94 micro m. The analysis of methylene blue dye infiltration through the dentinal surface and the retrofilling material demonstrated that the samples from the groups that were irradiated with the lasers showed significantly lower infiltration indexes than the ones from the control group. These results were compatible with the structural morphological changes evidenced through SEM analysis. Samples from groups II and IV (9.6 micro m CO(2)) showed clean smooth surfaces, fusion, and recrystallized dentine distributed homogeneously throughout the irradiated area sealing the dentinal tubules. Samples from groups III and V (Er:YAG 2.94 micro m) also presented clean surfaces, without smear layer, but roughly compatible to the ablationed dentine and without evidence of dentinal tubules. Through the conditions of this study, the Er:YAG 2.94 micro m and the 9.6 micro m CO(2) laser used for root canal resection and dentine surface treatment showed a reduction of permeability to methylene blue dye.

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Sealing ability of dental amalgams as retrograde fillings in endodontic therapy

Cited by 82 publications

References 13 publications

Marginal adaptation of mineral trioxide aggregate (MTA) compared with amalgam as a root‐end filling material: a low‐vacuum (LV) versus high‐vacuum (HV) SEM study

Marginal adaptation of mineral trioxide aggregate (MTA) compared with amalgam as a root‐end filling material: a low‐vacuum (LV) versus high‐vacuum (HV) SEM study

In vivo sealing ability of calcium hydroxide‐containing root canal sealers

Comparative Study of Dentine Permeability after Apicectomy and Surface Treatment with 9.6 µm TEA CO₂and Er:YAG Laser Irradiation

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Sealing ability of dental amalgams as retrograde fillings in endodontic therapy

Cited by 82 publications

References 13 publications

Marginal adaptation of mineral trioxide aggregate (MTA) compared with amalgam as a root‐end filling material: a low‐vacuum (LV) versus high‐vacuum (HV) SEM study

Marginal adaptation of mineral trioxide aggregate (MTA) compared with amalgam as a root‐end filling material: a low‐vacuum (LV) versus high‐vacuum (HV) SEM study

In vivo sealing ability of calcium hydroxide‐containing root canal sealers

Comparative Study of Dentine Permeability after Apicectomy and Surface Treatment with 9.6 µm TEA CO2and Er:YAG Laser Irradiation

Contact Info

Product

Resources

About

Comparative Study of Dentine Permeability after Apicectomy and Surface Treatment with 9.6 µm TEA CO₂and Er:YAG Laser Irradiation