Removal of fiber posts during endodontic retreatments using ultrasonic tips: A comparison between two different endodontic fiber posts (original) (raw)
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An investigation of the heat induced during ultrasonic post removal
Journal of Endodontics, 2007
The purpose of this study was to investigate the potential for temperature increase along the external root surface during ultrasonic post removal in a simulated clinical environment. Thirty-seven extracted teeth were decoronated, instrumented, and then obturated with gutta-percha and sealer. Post spaces were prepared, followed by cementation of stainless steel posts. A simulated clinical environment was created by using a polymethylmethacrylate sheet with holes custom fitted for the extracted teeth and then suspended over a heated water bath. Two thermocouples were attached at 6 and 12 mm from the top of the post along the external root surface. Teeth were divided into 3 test groups, no coolant, air-cooled, and water-cooled. Temperature changes were recorded by using a Vishay 5000 Strain Smart system. Results demonstrated that a significant difference existed in the average heat rates between the upper and lower thermocouples for no coolant and water-cooled groups at the medium setting and the aircooled group at the high setting. The average heat rates were significantly different between the 2 thermocouples for all 3 groups when comparing the 2 ultrasonic power settings. Results indicated that the average heat rate was less for the water-cooled group when using a medium power setting.
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.
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...
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.
BMC Oral Health, 2024
Navigated endodontics is a cutting-edge technology becoming increasingly more accessible for dental practitioners. Therefore, it is necessary to clarify the ideal technical parameters of this procedure to prevent collateral damage of the surrounding tissues. There is a limited number of studies available in published scientific literature referencing the possible collateral thermal damage due to high-speed rotary instruments used in guided endodontic drilling. The aim of our study was to investigate the different drilling parameters and their effect upon the temperature elevations measured on the outer surface of teeth during guided endodontic drilling.
Evaluation of Root-End Preparation with Two Different Endodontic Microsurgery Ultrasonic Tips
Biomedicines
The aim of this study is to compare root-end preparation performed with two different ultrasonic tips—CVDentus and NSK—and respective time requirements. After root-end resection, 32 teeth were randomly divided in two groups, according to the ultrasonic tip used for root-end preparation. Preparation time was recorded. Photomicrographs were taken to assess the following parameters: root surface microcracking, marginal integrity and presence of debris. One ultrasonic tip from each group was analyzed through scanning electron microscopy before and after root-end preparation. The significance level was set at α = 0.05. Incidence of microcracks in both groups was 12.5%. Solely intracanal microcracking was found, consistently positioned within the widest side of the remaining dentine. No statistically significant differences were verified between both experimental groups regarding marginal integrity (p = 0.102) and preparation time (p = 0.780), whereas statistical differences (p = 0.003) w...
Ultrasonic vibration: temperature rise on external root surface during broken instrument removal
Journal of endodontics, 2007
The effect of 2 ultrasonic tips and power settings on temperature rise of external root surface was investigated during ultrasonic vibration of intracanal broken instruments. Thirty maxillary human central incisors had lingual coronal access. The apical 5 mm of size 40 K-files was separated at apical region. Two thermocouples connected to digital thermometer were attached to external root surface to measure temperature rise. Central incisors were divided into 3 equal groups: group 1 in which Satelec ET 40 ultrasonic tip at power 1 was used, group 2 in which ET 40 at power 5 was used, and group 3 in which CPR 5 ultrasonic tip at power 1 was used. Ultrasonic vibration without coolant was activated for 2 minutes, and temperature rise was recorded at 1 and 2 minutes. At 1 minute, CPR 5 and ET 40 at power 1 showed statistically significant less temperature rise. CPR 5 demonstrated lower temperature rise compared with ET 40 when used for 2 minutes. ET 40 showed less temperature at power 1...
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.
Temperature rise on the external root surface during removal of endodontic fractured instruments
Clinical Oral Investigations, 2013
Objectives To investigate the temperature rise (TR) on the external root surface while preparing a staging platform, for removing intra-canal fractured instruments, using Gates Glidden (GG) drills. Materials and methods Thirty extracted mandibular incisors were decoronated and 3-3.5 mm of F3 ProTaper files were fractured 3 mm from the most coronal end of the root. Roots were divided into three groups. GG drills were used in a size-2 to size-5 sequence to prepare the staging platform coronal to the fractured segment. They were rotated at three speeds according to the study groups: group A for 2,000 revolutions per minute (rpm); group B for 4,000 rpm; and group C for 8,000 rpm. Temperature changes were recorded at the proximal and buccal or lingual external root surfaces while preparing the staging platform. Data were analyzed using the paired sample T, one-and two-ways ANOVA tests at p≤0.05. Results Overall, TR at the proximal root surface (5.44°C) was significantly higher than that at the buccal or lingual surface (3.25°C) (p<0.001). Generally, TR increased significantly as the size of GG drills or the revolution speed increased (p<0.05). GG5 drills rotated at 8,000 rpm produced the highest TR (10.85°C). There was no interaction effect of the GG drill size and the revolution speed on TR (p=0.272). Conclusion The highest TR on the external root surface, associated with preparation of a staging platform and produced by using GG drills size-5 rotating at up to 8,000 rpm, was lower than the damaging threshold. Clinical relevance A staging platform can be performed by modified GG drills (no 2 to 5) rotating at 8,000 rpm without generating a hazardous TR.
Revista de Odontologia da UNESP, 2016
Introduction The aim of endodontic retreatment is to remove the previous root filling materials completely to allow for the subsequent steps of cleaning, canal shaping and filling replacement. Objective To evaluate the efficacy of passive ultrasonic irrigation (PUI) in the removal of residual root filling material after removing the bulk of the root filling with nickel-titanium rotary instruments. Material and method Eighteen mesial isthmus-containing roots of human mandibular molars were prepared and filled. The root canal filling was removed with the ProTaper Retreatment system and K-files. The specimens were randomized into 2 groups (n = 9), both irrigated with 2.5% NaOCl and 17% EDTA. In the conventional group, an irrigation syringe was used. In the PUI group, the PUI technique was used. The roots were sectioned longitudinally and evaluated under stereomicroscopy. Student’s t test was used to compare groups and the general linear model was used to compare the apical, cervical, a...