Leakage of amalgam root fillings

Ford, T. R. Pitt

doi:10.1111/j.1365-2591.1980.tb00873.x

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…It is assumed that the use of low molecular weight tracers has advantages over the use of larger molecules because if the material and technique used to obturate the canal are able to prevent the penetration of small molecules, they should be able to prevent that of larger ones. In comparison with other studies (Pitt Ford 1980, Beltes et al 1988, Bradshaw et al 1989 the leakage values obtained are rather high. In the majority of previous studies of dye penetration, the external root surfaces were entirely covered with varnish so that the only portal of entry for the dye was along the interface between the root filling material and the dentine wall ofthe root canal.…”

Section: Discussioncontrasting

confidence: 69%

“…Sealing ability has been assessed in vttro by a number of means. These include the use of dyes (Pitt Ford 1980, Bramwell & Hicks 1986, radioactive isotopes (Tronstad et al 1983, Szeremeta-Browar et al 1985, bacteria (Luomanen & Tuompo 1985) and scanning electron microscopy (Tanzilli et al 1980 Amalgam has been used as a retrograde filling for some time and still remains the material most commonly employed. Different types of amalgam have been tested (Tronstad et al 1983, Mattison et al 1985 and opinions differ over whether conventional or high copper, zinc-containing or zinc-free amalgams provide the best seal.…”

Section: Introductionmentioning

confidence: 99%

“…The recommended depth of the cavity preparation for retrograde amalgams varies but there has been only one study which investigated the effect of the length of the amalgam filling (Mattison et al 1985); fillings 3 mm in length exhibited less leakage than those 1 mm in length. It has been suggested that in the conventional situation, amalgam fillings 5 mm long would prevent the passage of fluid between any residual canal space and the periapical tissues (Pitt Ford 1980). The purpose of this study was to assess: (i) the microleakage of conventional root canal fillings placed using the laterally condensed gutta-percha technique, (ii) the effect of root resection alone on microleakage of these root fillings, (iii) the effect ofthe presence or absence of conventional root fillings on microler.kage around retrograde amalgam fillings, and (iv) the effect of varying lengths of retrograde amalgam on the extent of microleakage.…”

Section: Introductionmentioning

confidence: 99%

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The sealing ability of amalgam used as a retrograde root filling in endodontic surgery

Edmunds

Thirawat

1989

Int Endodontic J

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A dye penetration technique was used to investigate the sealing ability of amalgam retrograde root fillings in vitro. A factorial design was employed to determine the effect of amalgam fillings of 1, 2 and 4 mm in length with and without prior filling of the canals with gutta-percha. The results were compared with a group of teeth filled with laterally condensed gutta-percha alone and another with laterally condensed gutta-percha plus root resection but with no retrograde filling. It was concluded that increasing the length of the amalgam filling did not improve the seal, that prior filling of the canal did not improve the seal, that retrograde root fillings were no worse than laterally condensed gutta-percha alone and that root resection of teeth filled with laterally condensed gutta-percha without retrograde filling was no worse than those filled with laterally condensed gutta-percha without root resection or retrograde root filling.

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Section: Discussioncontrasting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The sealing ability of amalgam used as a retrograde root filling in endodontic surgery

Edmunds

Thirawat

1989

Int Endodontic J

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“…Mahler & Nelson (1984) have shown that spherical alloys leak to a greater extent than a conventional lathe-cut alloy. Pitt Ford (1980), in a study of the leakage associated with amalgam root fillings, concluded that the increased ease of insertion and better adaptation of spherical alloys to the cavity walls, compared with conventional alloys, reduced leakage. Corrosion products are also slower to develop in the high copper aJloys, as they contain no y,-phase.…”

Section: Discussionmentioning

confidence: 99%

Assessment of leakage in the restored pulp chamber of endodontically treated multirooted teeth

Saunders¹,

Saunders

1990

Int Endodontic J

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The leakage associated with restorative materials placed within the pulp chamber of maxillary and mandibular molars was studied in vitro. The root canals and pulp chambers of 69 extracted teeth were prepared chemomechanically and sealed with gutta-percha and Tubliseal using cold lateral condensation. The teeth were divided into five groups. Gutta-percha was removed from the pulp chambers of three of the groups of 15 teeth and filled with one of three materials, a glass ionomer cement, a cermet cement or an amalgam. The gutta-percha was removed from the pulp chamber in the fourth group of nine teeth, which were left unfilled. The gutta-percha in the pulp chambers of the fifth group of teeth was left intact. The teeth were suspended in Indian ink, thermocycled for 24 hours and stored for a further 48 hours at 37 degrees C. They were then demineralized and cleared and the degree of coronal leakage was assessed. Those teeth with no filling in the pulp chamber showed extensive leakage. The gutta-percha-filled group demonstrated greater leakage than did the groups in which other restorative materials had been employed (P less than 0.01). No significant differences in leakage occurred between the other groups (P less than 0.05). It is recommended that the pulp chamber of molars should be restored with a filling material following root canal treatment.

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“…One view is that radiographically detectable voids may be places into which tissue fluid and bacteria could leak, stagnate and cause periapical inflammation, thus compromising the results of treatment. This concept further leads to the assumption that materials which effectively seal the canal space lessen the chances of subsequent infection and improve the prognosis (Schroeder 1954, Marshall & Massler 1961. Several tests in vitro have been designed, of which dye penetration has been most commonly used, to test the sealing ability of different endodontic materials and techniques (Grieve 1972, Pitt Ford 1980.…”

Section: Introductionmentioning

confidence: 99%