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Comparison of two vertical condensation obturation techniques: Touch ’n Heat modified and System B

1999; Wiley; Volume: 32; Issue: 4 Linguagem: Inglês

10.1046/j.1365-2591.1999.00215.x

1365-2591

G SILVER, Robert Love, David G. Purton,

Dental Anxiety and Anesthesia Techniques

Aim The aims of this study were firstly to compare the area of canal occupied by gutta‐percha, sealer or voids using the System B heating device with that obtained by a modified vertical condensation technique using the Touch ’n Heat; and secondly to compare the temperature changes at the root canal wall and external root surface during obturation with the above techniques. Methodology Forty‐five resin blocks, each with a standardized, simulated, prepared main root canal and five lateral canals, were assigned to three equal experimental groups. The canals were obturated using either the System B technique at two different temperature settings, or vertical condensation with a Touch ’n Heat instrument as the heat source. A heat transfer model was used to simultaneously record internal and external root surface temperature elevations duringobturation by the three techniques. Data were analysed using unpaired Student's t ‐test and Mann–Whitney U ‐test. Results Both obturation techniques produced root fillings consisting of over 90% gutta‐percha at most levels, although the percentages of sealer and voids 2–3 mm from the working length following System B obturation were higher than those found following modified vertical condensation. Modified vertical condensation resulted in more gutta‐percha in lateral canals. Obturation was accomplished more quickly using the System B, and temperature elevations produced during obturation with the System B were significantly less ( P 0.001) than with vertical condensation. An elevation of external root surface temperature by more than 108C occurred during vertical condensation. Conclusions The results suggest that the System B may produce an acceptable obturation and that the use of a Touch ’n Heat source during vertical condensation may result in damage to the periodontium.