Biomaterial Database

Warm vertical compaction sequences in relation to gutta-percha temperature. 1997

J Y Blum, and E Parahy, and P Machtou

Department of Endodontics, School of Dentistry, Universite Montpellier, France.

The aim of this study was to analyze warm vertical compaction sequences in relation to the temperature variations of gutta-percha. Twenty-four maxillary incisors were obturated according to two different instrumentation techniques: Compaction and heating were performed with either the monomanual classical or bimanual method. To evaluate gutta-percha temperature, thermocouples (TC) were introduced into channels bored through the dentin into the root canal system or fixed on the root surface at 8 (TC8), 4 (TC4), 2 (TC2), and 0 mm (TC0) from the apex. Maximal temperature was 118 degrees C for TC8, 52 degrees C for TC4, and 44 degrees C for TC2 and TC0. At TC0, the temperature remained above 42.9 degrees C for 10 +/- 5 s. These results show the importance of heating down to a distance of 7 mm to ensure a significant increase in apical gutta-percha temperature. They further indicate that the last compaction should last more than 15 s to avoid detrimental cooling and dimensional variations. The principal differences between the monomanual and bimanual methods were the compaction time (5.07 +/- 0.2 min vs 4.02 +/- 0.3 min) and the number of compactions (8 +/- 1 vs 12 +/- 2).

UI	MeSH Term	Description	Entries
D001831	Body Temperature	The measure of the level of heat of a human or animal.	Organ Temperature,Body Temperatures,Organ Temperatures,Temperature, Body,Temperature, Organ,Temperatures, Body,Temperatures, Organ
D003786	Dental Pulp Cavity	The space in a tooth bounded by the dentin and containing the dental pulp. The portion of the cavity within the crown of the tooth is the pulp chamber; the portion within the root is the pulp canal or root canal.	Pulp Canal,Pulp Chamber,Root Canal,Cavities, Dental Pulp,Cavity, Dental Pulp,Dental Pulp Cavities,Pulp Cavities, Dental,Pulp Cavity, Dental,Canal, Pulp,Canal, Root,Canals, Pulp,Canals, Root,Chamber, Pulp,Chambers, Pulp,Pulp Canals,Pulp Chambers,Root Canals
D004055	Differential Thermal Analysis	Technique by which phase transitions of chemical reactions can be followed by observation of the heat absorbed or liberated.	Analysis, Differential Thermal,Thermal Analysis, Differential,Analyses, Differential Thermal,Differential Thermal Analyses,Thermal Analyses, Differential
D005069	Evaluation Studies as Topic	Works about studies that determine the effectiveness or value of processes, personnel, and equipment, or the material on conducting such studies.	Critique,Evaluation Indexes,Evaluation Methodology,Evaluation Report,Evaluation Research,Methodology, Evaluation,Pre-Post Tests,Qualitative Evaluation,Quantitative Evaluation,Theoretical Effectiveness,Use-Effectiveness,Critiques,Effectiveness, Theoretical,Evaluation Methodologies,Evaluation Reports,Evaluation, Qualitative,Evaluation, Quantitative,Evaluations, Qualitative,Evaluations, Quantitative,Indexes, Evaluation,Methodologies, Evaluation,Pre Post Tests,Pre-Post Test,Qualitative Evaluations,Quantitative Evaluations,Report, Evaluation,Reports, Evaluation,Research, Evaluation,Test, Pre-Post,Tests, Pre-Post,Use Effectiveness
D006171	Gutta-Percha	Coagulated exudate isolated from several species of the tropical tree Palaquium (Sapotaceae). It is the trans-isomer of natural rubber and is used as a filling and impression material in dentistry and orthopedics and as an insulator in electronics. It has also been used as a rubber substitute.	Thermafil,Guttapercha,Ultrafil,Gutta Percha
D006358	Hot Temperature	Presence of warmth or heat or a temperature notably higher than an accustomed norm.	Heat,Hot Temperatures,Temperature, Hot,Temperatures, Hot
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000704	Analysis of Variance	A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.	ANOVA,Analysis, Variance,Variance Analysis,Analyses, Variance,Variance Analyses
D012389	Root Canal Obturation	Phase of endodontic treatment in which a root canal system that has been cleaned is filled through use of special materials and techniques in order to prevent reinfection.	Endodontic Obturation,Canal Obturation, Root,Canal Obturations, Root,Endodontic Obturations,Obturation, Endodontic,Obturation, Root Canal,Obturations, Endodontic,Obturations, Root Canal,Root Canal Obturations
D013816	Thermodynamics	A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed)	Thermodynamic