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Influence of various polishing methods on pulp temperature

An in vitro study

Einfluss verschiedener Poliermethoden auf die Pulpatemperatur

Eine In-vitro-Studie

  • Original article
  • Published:
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Aims and scope Submit manuscript

Abstract

Objective

After orthodontic debonding, adhesive removal can lead to rises in pulp temperature, causing histological changes or pulp necrosis. The objective of this study was to measure increases in pulp temperature during adhesive removal using different instruments and various cooling procedures.

Materials and methods

A thermoelement was introduced into the pulp chamber of 10 human incisors. The teeth were immersed in a 36°C water bath up to the cementoenamel junction. Two carbide burs, one polishing disk and two rubber points were used for polishing. All measurements were taken over a 10 s period by a single investigator, under slight pressure and with constant motion. Three cooling procedures were examined: no cooling, air cooling and water cooling. Pulp temperatures were measured before polishing and after 10 s of polishing.

Results

Without cooling, the two rubber points revealed clinically relevant temperature increases of 6.1°C and 12.4°C. Cooling with air and with water reduced pulp temperature in conjunction with all polishing methods. Air cooling was most efficient, except in combination with the polishing disk.

Conclusion

Under these study conditions, carbide burs and polishing disks can be used safely and without risk to the pulp, even without cooling. On the other hand, rubber points cause a marked increase in pulp temperature when used without cooling.

Zusammenfassung

Ziel

Pulpatemperaturanstiege während der Adhäsiventfernung nach dem kieferorthopädischen Debonding könnten zu histologischen Veränderungen oder zum Absterben der Pulpa führen. Ziel der vorliegenden Untersuchung war die Bestimmung der Pulpatemperaturanstiege während der Adhäsiventfernung mit verschiedenen Instrumenten und unterschiedlicher Kühlung.

Material und Methodik

Ein Thermoelement wurde in die Pulpakammer von 10 humanen Unterkieferincisivi eingeführt. Die Zähne wurden bis zur Schmelzzementgrenze in ein Wasserbad mit einer Temperatur von 36°C eingetaucht. Zur Polierung wurden 2 Karbidbohrer, 1 Polierscheibe und 2 Gummispitzen verwendet. Alle Messungen wurden durch einen Behandler unter leichtem Druck und konstanter Bewegung während 10 s durchgeführt. Untersucht wurden 3 Kühlmethoden: keine Kühlung, Kühlung mit Luft und Kühlung mit Wasser. Die Pulpatemperaturen wurden vor Beginn und nach 10 s Polierung aufgezeichnet.

Ergebnisse

Die beiden Gummispitzen zeigten ohne Kühlung klinisch relevante Temperaturanstiege von 6,1°C und 12,4°C. Kühlung mit Luft oder mit Wasser resultierte in einer Reduktion der Pulpatemperatur für alle Poliermethoden. Außer in der Kombination mit der Polierscheibe war Luft die effizienteste Kühlmethode.

Schlussfolgerung

Unter den Anwendungsbedingungen der vorliegenden Studie können die Karbidbohrer und die Polierscheibe selbst ohne Kühlung sicher und ohne Pulparisiko verwendet werden. Gummispitzen hingegen führten ohne Kühlung zu einem starken intrapulpalen Temperaturanstieg.

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The corresponding author states that there are no conflicts of interest.

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Authors and Affiliations

  1. Clinic for Orthodontics and Pediatric Dentistry, University of Basel, Hebelstr. 3, 4056, Basel, Switzerland

    S. Mank, M. Steineck &  L. Brauchli

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  1. S. Mank
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  2. M. Steineck
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  3. L. Brauchli
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Correspondence to L. Brauchli.

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Mank, S., Steineck, M. & Brauchli, L. Influence of various polishing methods on pulp temperature. J Orofac Orthop 72, 348–357 (2011). https://doi.org/10.1007/s00056-011-0039-y

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