Abstract
The results of instrumentation studies in small curved canals using various instruments and techniques are not consistent. The amount of instrument precurving and a gradual or abrupt curve of the canal may have influenced the results of these studies. One hundred sixty resin blocks with simulated canals were used. Eighty blocks had gradual (GC) 30 degree curves, the remainder had abrupt (AC) 30 degree curves. Ten blocks for each curvature and for each degree of precurving amount (0, 15, 20, 25, 30, 35, 40, or 45 degrees) were instrumented with a machine that imparted only an in and out motion. The simulated canals were size 30 at the apex, and size 30 stainless steel K-f iles were used to instrument the canals. A transportation ("t") index was determined at two levels: T1 (1 mm from the apex) and TB (a line bisecting the curve of the canal). For GC at T1 and TB, 40and 20-degree curved instruments respectively produced significantly less transportation than all other curvatures (p <0.0001). For AC at T1 and TB, 35 and 25 degree instruments respectively produced significantly less transportation than all other curvatures (p <0.0001). Comparing GC and AC, the transportation for AC was significantly less (p <0.0015).
| Original language | English (US) |
|---|---|
| Pages (from-to) | 122-124 |
| Number of pages | 3 |
| Journal | Journal of Endodontics |
| Volume | 24 |
| Issue number | 2 |
| State | Published - 1998 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Dentistry(all)
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The effect of instrument precurving on transportation in simulated curved canals. / Svec, Timothy.
In: Journal of Endodontics, Vol. 24, No. 2, 1998, p. 122-124.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The effect of instrument precurving on transportation in simulated curved canals
AU - Svec, Timothy
PY - 1998
Y1 - 1998
N2 - The results of instrumentation studies in small curved canals using various instruments and techniques are not consistent. The amount of instrument precurving and a gradual or abrupt curve of the canal may have influenced the results of these studies. One hundred sixty resin blocks with simulated canals were used. Eighty blocks had gradual (GC) 30 degree curves, the remainder had abrupt (AC) 30 degree curves. Ten blocks for each curvature and for each degree of precurving amount (0, 15, 20, 25, 30, 35, 40, or 45 degrees) were instrumented with a machine that imparted only an in and out motion. The simulated canals were size 30 at the apex, and size 30 stainless steel K-f iles were used to instrument the canals. A transportation ("t") index was determined at two levels: T1 (1 mm from the apex) and TB (a line bisecting the curve of the canal). For GC at T1 and TB, 40and 20-degree curved instruments respectively produced significantly less transportation than all other curvatures (p <0.0001). For AC at T1 and TB, 35 and 25 degree instruments respectively produced significantly less transportation than all other curvatures (p <0.0001). Comparing GC and AC, the transportation for AC was significantly less (p <0.0015).
AB - The results of instrumentation studies in small curved canals using various instruments and techniques are not consistent. The amount of instrument precurving and a gradual or abrupt curve of the canal may have influenced the results of these studies. One hundred sixty resin blocks with simulated canals were used. Eighty blocks had gradual (GC) 30 degree curves, the remainder had abrupt (AC) 30 degree curves. Ten blocks for each curvature and for each degree of precurving amount (0, 15, 20, 25, 30, 35, 40, or 45 degrees) were instrumented with a machine that imparted only an in and out motion. The simulated canals were size 30 at the apex, and size 30 stainless steel K-f iles were used to instrument the canals. A transportation ("t") index was determined at two levels: T1 (1 mm from the apex) and TB (a line bisecting the curve of the canal). For GC at T1 and TB, 40and 20-degree curved instruments respectively produced significantly less transportation than all other curvatures (p <0.0001). For AC at T1 and TB, 35 and 25 degree instruments respectively produced significantly less transportation than all other curvatures (p <0.0001). Comparing GC and AC, the transportation for AC was significantly less (p <0.0015).
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M3 - Article
VL - 24
SP - 122
EP - 124
JO - Journal of Endodontics
JF - Journal of Endodontics
SN - 0099-2399
IS - 2
ER -