| 1589 Thermographic assessment of rotary Nickel-Titanium preparation and thermoplasic obturation techniques | ||
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D. MAHMOUD, D. HUSSEY, P. BIAGIONI, and P. LAMEY, Queen's University, Belfast, United Kingdom Objectives: There has been much recent interest in the use of rotary Nickel-Titanium (Ni-Ti) files in endodontics. The files are produced in larger tapers than stainless steel files due to their flexibility. The increased taper allows for greater surface contact and faster preparation of the canal. The files are mechanically rotated at a regulated speeds usually between 150 and 300rpm.The aim of this study was to investigate the thermal effects of rotary Ni-Ti preparation and subsequent thermoplastic obturation on the root surface. Methods: 40 recently extracted, non-restored, single canal premolars were selected. The pulp space was accessed and the pulp contents extirpated. A standardised method was used to prepare the canals using either Profile (Dentsply, Weybridge, UK) or K3 (Kerr Sybron, Peterborough, UK) Ni-Ti files (20 in each group). All canals were prepared with orifice shapers followed by 06 taper files using a crown down technique in the presence of an EDTA lubricant. Apices were prepared to a size 25 file. The teeth were then obturated with Thermaprep Plus gutta percha cones (Dentsply, Weybridge, UK). During both procedures, temperatures on the root surfaces were measured using an infrared thermal imaging camera (ThermaCam S60, Flir Systems, Danderyd, Sweden). Results: The mean temperatures during preparation were 21.62oC s.d.1.09 (Profile), 21.36oC s.d.1.4 (K3), mean maximum temperatures 22.92oC s.d. 0.76 (Profile), 22.90 oC s.d.0.80 (K3). During obturation the mean temperatures were 22.37oC s.d.1.88 (Profile) and 22.38oC s.d.1.06 (K3), mean maximum temperatures 24.98oC s.d. 1.36 (Profile) and 23.90 oC s.d.0.76 (K3). Statistical analysis (t-test) did not reveal any significant differences between the groups investigated (p> 0.5 for all). Conclusions: It is concluded that the use of rotary Ni-Ti files with an EDTA lubricant and subsequent thermoplastic oburation with Thermaprep Plus did not result in significant temperatures on the root surface of premolars. | ||
| Seq #194 - Clinical Pulp Biology II 2:00 PM-4:00 PM, Friday, 11 March 2005 Baltimore Convention Center Exhibit Hall E-F | ||
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