Temperature rise due to finishing of direct restorative materials.
An in vitro study was performed to evaluate the effect of four variables on the temperature rise produced by the finishing of restorations. The four variables were: restorative material, finishing agent, finishing time, and depth of dentin under the restoration. Class V preparations were cut on extracted premolars and restored with amalgam, composite, or glass ionomer cement. Finishing was done with wet pumice and cup, wet pumice and a brush, a grit rubber polishing point, and an aluminum oxide- coated disc. Finishing time was continuous or intermittent for up to 1 minute. Dentin thickness under the restoration was 0.5 mm to 3.0 mm. Amalgam produced the highest temperature rises at the pulp, while composite and glass ionomer were no different than the untreated (virgin) tooth. Aluminum oxide discs produced the largest temperature rise, wet pumice with a brush the least. Temperature rise increased almost linearly with continuous finishing, while intermittent finishing significantly reduced temperature rise in all cases. Thickness of remaining dentin was only significant for the amalgam restoration, and then only at 1.0 and 0.5 mm.
Stewart
G P
GP
Department of Restorative Dentistry, Southern Illinois University, Alton 62002.
Bachman
T A
TA
Hatton
J F
JF
D000537:Aluminum Oxide / Q000009:adverse effects; D000704:Analysis of Variance; D001641:Bicuspid; D003188:Composite Resins; D003723:Dental Amalgam; D003737:Dental Cavity Preparation / Q000009:adverse effects*; D003775:Dental Polishing / Q000009:adverse effects*; D003804:Dentin; D005899:Glass Ionomer Cements; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D012408:Rubber / Q000009:adverse effects; D017640:Silicates; D012824:Silicic Acid / Q000009:adverse effects
D003188:Composite Resins; D005899:Glass Ionomer Cements; D017640:Silicates; D012824:Silicic Acid; D003723:Dental Amalgam; D012408:Rubber; D000537:Aluminum Oxide; C005144:pumice