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PubMed2002

A comparative study of lateral condensation, heat-softened gutta-percha, and a modified master cone heat-softened backfilling technique.

AIM: The aim of the study was to compare the quality of root fillings completed by lateral condensation (L), Thermafil (TF), and a new technique using Thermafil for backfilling (BF), with special emphasis on control of overfilling. METHODOLOGY: Sixty curved canals in plastic blocks were prepared with the ProFile system to size 40/04 taper in the apical half and to 06 taper in the coronal half. The canals were divided into three groups of 20. Apical patency was verified with a size 15 K-file. The canals were then filled using three different techniques: LC (20 canals), TF (20 canals), and BF, where a size 40 master point with sealer was seated prior to the introduction of a size 30 Thermafil point (20 canals). The same resin-based sealer was used on each occasion. The root fillings were assessed using stereo-microscopy for material extrusion, digital radiography for occurrence of voids, and microscopy of sections for voids and thickness of sealer layer. RESULTS: Extrusion of both gutta-percha and sealer occurred in all 20 canals filled with the TF technique, but only three and five cases of sealer extrusion were detected with LC and BF techniques, respectively. No voids were detected in the TF group, whereas small voids were present in most fillings in the LC and BF groups. The average total length of the voids was less than 1 mm per canal. The thickness of the sealer layer in the middle and apical parts was greater in the LC and BF groups than in the TF group. CONCLUSIONS: LC and BF techniques resulted in fewer overfills than TF. Voids were absent in TF fillings, whilst small voids were found in the LC and BF groups.

Dental Pulp Cavity↗
PubMedDate not supplied

Relationships between heat production, heat loss, and body temperature for rats with burn injuries between 26% and 63% of the body surface area.

Burn injury in man is characterized by increased body temperature proportional to burn wound size and may represent fever and/or hyperthermia. A nonseptic animal model used to study this phenomena has not been described. To test the hypothesis that large burn injuries in rats would produce increased body temperature, the rectal, skin, and body temperatures were sequentially measured and were calculated for rats in the control group and rats with burn injuries covering 26% to 63% of the body surface area [< or = 35%, 36% to 45%, and > or = 46% body surface area]. The group with burns covering > or = 46% of the body surface area had significantly higher rectal temperatures than did at least one other group on postburn days 7, 9, 11, 13, 18, and 20. On postburn days 7 and 11 this increase was significantly higher than that of all burn and control groups. Animals did not demonstrate any overt evidence of wound infection. These data do not establish a cause for increased body temperature after burn injury but suggest that a reproducible animal model may be possible for the study of the cause of increased body temperature after burn injury.

Animals↗