TEMPERATURE CHANGES ON THE EXTERNAL ROOT SURFACE DURING POST SPACE PREPARATION (in vitro study) (original) (raw)
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Nigerian Journal of Clinical Practice, 2015
Aims: The aim of this study is to evaluate increases in temperature on the external root surface during endodontic treatment with different rotary systems. Materials and Methods: Fifty human mandibular incisors with a single root canal were selected. All root canals were instrumented using a size 20 Hedstrom file, and the canals were irrigated with 5% sodium hypochlorite solution. The samples were randomly divided into the following three groups of 15 teeth: Group 1: The OneShape Endodontic File no.: 25; Group 2: The Reciproc Endodontic File no.: 25; Group 3: The WaveOne Endodontic File no.: 25. During the preparation, the temperature changes were measured in the middle third of the roots using a noncontact infrared thermometer. The temperature data were transferred from the thermometer to the computer and were observed graphically. Statistical analysis was performed using the Kruskal-Wallis analysis of variance at a significance level of 0.05. Results: The increases in temperature caused by the OneShape file system were lower than those of the other files (P < 0.05). The WaveOne file showed the highest temperature increases. However, there were no significant differences between the Reciproc and WaveOne files. Conclusions: The single file rotary systems used in this study may be recommended for clinical use.
This study investigated the effects of endodontic treatment procedures and different post systems rehabilitation steps on the strain and temperature rise on apical and cervical root dentin regions. Twenty-one extracted human canine teeth had two strain gages attached to the distal root surface and two thermocouples attached to the mesial root surface (cervical and apical). The strain and temperature rise were recorded during the following procedures: root canal preparation, final rinse and drying, root canal filling and canal relief. Then the teeth were divided into three groups (n=7), according to the type of post system: CPC, cast post and core; FGP, fiberglass post; and PSP, prefabricated steel post. Data continued to be recorded during the post space preparation, post modeling (only for CPC), post trying and post cementation. Data were subjected to a two-way ANOVA followed by Tukey’s test (=0.05). The post-space preparation caused the highest temperature rise (4.0-14.9 °C) and the highest strain in the apical region during irrespective of post type. The resin cement light-activation resulted in significant temperature increases in the cervical region for all of the groups. The canal relief and the post-space preparation produced highest temperature rises. The CPC post modeling resulted in higher root strain level similarly the level of post preparation. The PSP resulted in highest strain during post trying and post cementation.
Journal of IMAB - Annual Proceeding (Scientific Papers), 2010
Various manipulations during endodontic treatment and restoration of endodontic treated teeth can be associated with increase of the temperature in dental structure and periodontal tissue. These manipulations include: mechanical root canal preparation, obturation with warm condensation techniques, root-canal preparation for radicular post. The critical level of temperature, that doesn't cause irreversible consequences is 43°C. The aim of this study is to investigate the temperature changes on external root surface during endodontic treatment depending of dentin thickness. Thirty six single-rooted, human teeth extracted for prosthetic or periodontal reasons were selected for this study. Teeth were divided into four groups-nine teeth in each one. The temperature changes during mechanical root canal preparation, vertical warm condensation, continious wave of condensation and root canal preparation for radicular post are explored and the results are presented.
Journal of Endodontics, 2016
Introduction: The purpose of this study was to measure the temperature rise on the external root surface of filled root canals using Touch'n Heat (Analytic Endodontics, Orange, CA), the TC System (TC; Tanaka de Castro & Minatel Ltda, Cascavel, PR, Brazil), and the Tagger technique. Methods: Forty-five single-canal mandibular premolar human teeth were used in the 3 experimental groups. The root canals were enlarged to accommodate up to an R40 Reciproc file (VDW, Munich, Germany). Next, the specimens were filled according to the technique evaluated. The measurement of the temperature was performed by K chromium-aluminum thermocouples attached to the coronal, middle, and apical root levels. Results: There was a significant difference among the 3 techniques (P < .001) in relation to the temperature variation between the highest temperature and the initial temperature. The highest temperature change was found with the Tagger technique at the middle third root level (11.8ºC), and the lowest variation was in TC at the cervical third (2.05ºC). Conclusions: There was a rise of temperature on the external root surface for all of the techniques evaluated. TC showed the lowest temperature rise.
Journal of Pharmaceutical Research International, 2022
Aims: To evaluate the effect of intracanal cryotherapy on surface temperature change in the root apex with different thickness. Study Design: Comparative Study. Place and Duration of Study: Operative Dentistry Department: Altamash Institute of Dental Medicine, Karachi, Pakistan: July 2020 till June 2021. Materials & Methods: Sixty extracted single-rooted teeth were randomly divided into two groups: 30 each with one group consisting of teeth with ≤3 mm root thickness and another group consisting of teeth with thickness >3mm. Both groups were equally subdivided into Group A and Group B. After endodontic preparation of teeth, Group A underwent room temperature saline irrigation and Group B cold temperature saline (2.5°C) irrigation. A digital thermometer was used to measure the external root surface temperature by placing the thermocouple at 2 mm from the apex of the root’s buccal surface. Results: Initial and final temperatures were compared using paired t-test. Independent t-test ...
European Journal of Dentistry, 2019
Objective This study measured the in vivo temperature of prepared root canal walls during various stages of treatment prior to endodontic postcementation. Materials and Methods One tooth each from five patients requiring endodontic treatment received conventional gutta-percha obturation. The coronal 4 mm of gutta-percha was removed by drilling and the canal wall temperature was measured. A sterile, saline rinse was applied, and another temperature value was recorded. Paper points were placed, and the wall temperature was recorded. A standardized period of 1.5 minute passed, simulating time needed to mix and place the resin cement and post (no resin was placed), after which the final wall temperature was obtained. The tooth was temporized and scheduled for prosthetic reconstruction. A one-way repeated measure analysis of variance (with Tukey's post hoc test) was performed among mean temperature values for each treatment stage (preset α 0.05). Results Significant temperature diffe...
World Journal of Dentistry, 2021
Aim and objective: The study aimed to compare temperature increase on the external root surface in coronal third, middle third, and apical third of teeth during mechanical instrumentation and thermoplasticized gutta-percha obturation using resistance temperature detector (RTD) probes. Materials and methods: A total of 72 extracted mandibular premolar teeth were selected based on predetermined inclusion and exclusion criteria and randomly divided into two groups for measuring the temperature change by placing probes at coronal third, middle third, and apical third of external root surface during instrumentation with PTG and WOG, respectively. Both the groups were further subdivided into two subgroups consisting of 18 teeth each and temperature was recorded at three-thirds during thermoplasticized obturation with RTD during the Thermafil obturator system and E&Q injection system. The recorded temperature was statistically analyzed to evaluate the highest temperature rise during different procedures. Results: The temperature rise during biomechanical preparation was higher with ProTaper Gold, at the middle third of root surface, followed by an apical and coronal third than WaveOne Gold. Among both thermoplasticized obturation, temperature rise with E&Q injectable system was highest, at apical third, followed by the middle and coronal third, than Thermafil system. Conclusion: For biomechanical preparation of root canal, reciprocating WaveOne Gold system with Thermafil carrier-based obturation system should be preferred for biomechanical preparation and obturation, respectively, during root canal treatment, with respect to safety regarding temperature rise on the root surface. Clinical significance: Biomechanical preparation and thermoplasticized obturation could lead to temperature alteration irrespective of the type of techniques. Although clinically it has been seen that the temperature alteration is within the safer range; however, it is advised that the clinician should wisely choose the appropriate instrumentation and obturation techniques to minimize the temperature application in specific clinical cases.
Journal of Endodontics, 2014
Introduction: During warm vertical compaction of gutta-percha, root canal sealers with different chemical compositions absorb the heat generated inside the root canal. The aim of this research was to assess physicochemical modifications of sealers subjected to the System B heat source (Analytic Technology, Redmond, WA) and to evaluate the effect that the use of different sealers has on the heat transfer to the external root surface. Methods: Three proprietary brand sealers (AH Plus [Dentsply International, Addlestone, UK], Pulp Canal Sealer [Kerr Corporation, Orange, CA], MTA Fillapex [Angelus Dental Solutions, Londrina, PR, Brazil]) and a prototype sealer based on Portland cement were assessed. The heat generated on the surfaces of System pluggers and the heat dissipation at different levels (apical, midroot, and cervical) over root surface while using different sealers was assessed using thermocouples. Data were collected in 3 different environmental conditions with the tooth suspended in air, immersed in Hank's balanced salt solution, or gelatinized Hank's balanced salt solution. Chemical changes in the sealers induced by the heat were monitored by Fourier transform infrared spectroscopy. The effect of heat changes on the setting time and compressive strength of the sealers was also assessed. Results: The continuous wave plugger sustained a rise in temperature at a maximum of 80 C at the instrument shank. The highest change in temperature on the external root surface was recorded after 1.5 minutes from the start of heating, and it was restored to body temperature by 6 minutes. Environmental conditions affected heat dissipation for all the sealers in the midroot and cervical regions and the highest increase in temperature ($60 C) recorded in air. In the midroot and cervical regions, the type of sealer used did not affect the rise in temperature. In the apical region, AH Plus obturations resulted in a greater rise in temperature, and the chemical composition of this sealer was affected by high temperature; it also induced a reduction in sealer setting time and strength. Conclusions: It could be concluded that surrounding conditions, such as temperature and humidity, exerted influence on heating dissipation during the continuous wave of the condensation obturation technique and that root canal sealers presented different conductive/isolating properties. Furthermore, the physical and chemical properties of AH Plus were negatively affected by the changes in temperature.
Thermal sensitivity of endodontically treated teeth
International Endodontic Journal, 1999
Case reports The problem of thermal sensitivity following non-surgical root-canal treatment is explored and case reports are presented. Possible causes for posttreatment discomfort from endodontic and restorative aetiologies are discussed, as are the mechanisms to explain the patients' painful experiences. Treatment of this problem may vary from the simple replacement of a defective restoration to a more extensive non-surgical retreatment of the case, despite radiographic evidence of an acceptable root filling and normal periradicular tissues.
Ain Shams Dental Journal
Introduction: During root-end cavity preparation, thermal changes may occur on the external surface of the rootwhich may cause injury to the periodontium. Objective: The aim of this study is to evaluate thermal changes during ultrasonic retrograde cavity preparationusing smooth stainless steel or diamond coated ultrasonic tips. Methods: Root-end section level was set at 3 mm from the apex, and all the roots were resected with 90degreeangle to their longitudinal axis. Samples were randomly divided into two groups of 10 teeth each for two differentultrasonic tips to be used, i.e. smooth stainless steel ultrasonic tip and diamond coated ultrasonic tip. Tefloninsulated type K temperature probe were used to measure temperature changes during the root-end cavitypreparations. Results: The temperature rise value of the overall maximum temperature (mean ± standard deviation) wassignificantly higher in coated group (41.11 ± 3.02) than that of the smooth group (32.22 ± 2.44). A statisticallysignificant difference was observed between both groups (P < 0.0001). Conclusion: Temperature rise is significantly higher while using diamond coated retrotips.