An Investigation of the sealing properties of some root filling materials

Thermo‐mechanical compaction of Gutta‐percha root filling

“…This shows that the apical dentine plug, without a completed root filling, does not prevent penetration of dye into the empty canal. Contrary to the findings of previous studies (Kapsimalis & Evans 1966, Messing 1970, Adams et al 1979, Pitt Ford 1980, penetration of dye into the root canal occurred relatively frequently (22-33 per cent) in the present investigation, regardless of the type of sealer used and the accuracy-fit of G-P cores. However, Pitt Ford (1980) has demonstrated that there is no correlation between leakage of root fillings and their tissue reaction, so the clinical relevance of the results of in vitro studies should be interpreted witlf caution:…”

“…It has been found in clinical practice that gutta-percha (obturating) cones and a sealer meet the necessary requirements of biocompatibility and sealing (Strindberg 1956, Ingle & Beveridge 1976, Horsted & Nygaard-Ostby 1978, Kerekes & Tronstad 1979. This has been confirmed by experimental research (Nygaard-Ostby 1939, 1961, Dow & Ingle 1955, Messing 1970, Pitt Ford 1980. Therefore, gutta-percha and a sealer has become the most popular root-filling material throughout the world.…”

Leakage of amalgam root fillings

“…The earliest investigation into leakage of root fillings was undertaken by Dow & Ingle (1955) and the first study which used dyes instead of radio-isotopes was by Antoniazzi et al (1968). The leakage of amalgam conventional root fillings has been examined by Messing (1970); however, his study involved first only two canals filled with amalgam and secondly the use of a high molecular weight dye molecule which showed no leakage. Barry et al (1976) examined the leakage of retrograde amalgam root fillings; they filled 100 teeth with amalgam using a conventional alloy and immersed the teeth in 2 per cent methylene blue dye for 7 days; the mean leakage was 1.3 mm with a standard deviation ±1.5 mm.…”

In vitro comparative evaluation of apical leakage using a bioceramic sealer with three different obturating techniques: A glucose leakage model

“…However, laboratory tests remain the only effective preclinical screening procedure that can foretell or indicate clinical outcomes. Researchers have implemented different experimental methods for evaluating microleakage following obturation, such as radioisotopes,[ 9 ] dyes,[ 10 ] bacteria,[ 11 ] proteins,[ 12 ] endotoxins,[ 11 ] glucose penetration,[ 8 ] and computerized fluid filtration. [ 13 ]…”