Evaluation of Drill-Induced Heat Transmission in an Orbital Model

ABSTRACT Purpose: To evaluate the influence of saline irrigation on temperature rise in orbit bones and the optic canal during high-speed drilling. Methods: An experimental study measuring temperature rise in an orbit during high-speed drilling was conducted. The orbital rims, sphenoid bone, and opt...

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Bibliographic Details
Published in:	Orbit (Amsterdam) Vol. 32; no. 1; pp. 27 - 29
Main Authors:	Chan, Patrick, Graue, Gerardo F., Pizzarello, Daniel B., Kim, Alyn J., Kazim, Michael
Format:	Journal Article
Language:	English
Published:	England Informa Healthcare USA, Inc 01-02-2013 Taylor & Francis
Subjects:	Animals Body Temperature - physiology Goats heat-induced damage High-speed drill Models, Animal Ophthalmologic Surgical Procedures - instrumentation optic nerve temperature Orbit - surgery Osteotomy - instrumentation Sodium Chloride - administration & dosage Therapeutic Irrigation Thermography
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Summary:	ABSTRACT Purpose: To evaluate the influence of saline irrigation on temperature rise in orbit bones and the optic canal during high-speed drilling. Methods: An experimental study measuring temperature rise in an orbit during high-speed drilling was conducted. The orbital rims, sphenoid bone, and optic canals of 6 unpreserved caprine orbits were drilled with a 3.1-mm diamond drill bit at 35,000 rpm. Each orbit was divided into groups receiving no irrigation, continuous or intermittent external irrigation at 5-second intervals during the procedures. The temperature rise of each site was compared among the groups, along with the duration of drilling. Results: The mean (±SD) temperature elevation in the optic canal without irrigation was 2.38 °C (±0.30 °C). This was significantly higher than in the canals receiving intermittent irrigation (0.90 °C ± 0.40 °C; p < 0.001) and continuous irrigation (0.66 °C ± 0.40 °C; p < 0.001). Mean temperature rise in the orbital rim without irrigation was significantly higher (3.51 °C ± 1.30 °C) than with intermittent (1.05 °C ± 0.31 °C; p < 0.001) and continuous (0.98 °C ± 0.61 °C; p < 0.001) irrigation. Mean temperature rise in the sphenoid was significantly higher (3.68 °C ± 1.66 °C) without irrigation than with intermittent (1.36 °C ± 1.17 °C; p = 0.005) and continuous (0.90 °C ± 0.33 °C; p < 0.001) irrigation. There were no statistically significant differences between any of the intermittent and continuous irrigation groups. Conclusions: The presence of either continuous or intermittent irrigation during orbital drilling procedures significantly decreases the temperature rise in the region adjacent to the surgical site. This has important implications for surgical technique when operating near the optic canal. Further studies regarding potential effects on the optic nerve are warranted.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0167-6830 1744-5108
DOI:	10.3109/01676830.2012.747215