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Effects of Operating Temperature of System B on Root Surface Temperature and Obturation Quality

Author: HeFengPeng
Tutor: FangChangYun
School: Central South University
Course: Stomatology
Keywords: Warm gutta-percha System B Thermal injury Microleakage Temperature on root surface
CLC: R781.05
Type: Master's thesis
Year: 2013
Downloads: 13
Quote: 0
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Objectives:To search an ideal operating temperature for System B technique during vertical condensation,which can both maximum avoid the periodontal tissue injury,and achieve good obturation quality, in vitro study.Methods:Sixty-four double-rooted premolar teeth, extracted because of orthodontic reasons, were selected for this study. They were all prepared by using a combination of Ni-Ti files and crown-down technique. The teeth were randomly divided into six test groups of10each(20canals each) and two control groups (2positive and2negative). Group Al:obturated at the200℃, without sealer; Group A2:obturated at the200℃, with sealer; Group B1:obturated at the180℃,without sealer; Group B2:obturated at the180℃,with sealer; Group C1:obturated at the160℃,without sealer; Group C2:obturated at the160℃,with sealer. Using the System B technique to fill root apex area.Each test group root surface coated with two layers of nail polish from the apical foramen to2mm above. The two control groups are not obturated. The surface of each negative control group was coated with two layers of nail polish, while the surface of positive control group was not. Measure the length of penetration under stereo microscope to Inspect Apical microleakage by dye penetration method. This experiment compared the length of penetration by the independent two-sample t-test. Results:Root surface temperature value of the statistically significant difference at three different operating temperature settings(P<0.05). Root surface temperature rise in16℃11℃and8℃, the use of sealer on the root surface temperature change was not statistically significant (P>0.05). The apical microleakage of200℃and180℃was no significant difference (P>0.05),the apical microleakage of160℃compared to the other two groups were statistically significant differences(P<0.05). When operating temperature was set at200℃,the use of sealers on microleakage was not statistically significant (P>0.05), and the operating temperature was set at180℃and160℃, the use of sealers could reduce the generation of microleakage(P<0.05).Conclusion:1.Temperature change on the root surface is proportional to the operating temperature of System B. When the operating temperature exceeds180℃, may cause thermal injury to the periodontal tissue.The use of the sealer had no significant effect on the temperature rise.2. At200℃and180℃had no significant difference, the sealing ability of160℃decreased significantly. At180℃and160℃,the use of sealer could reduce the generation of microleakage.3. Recommendations for the use of System B technology in clinical root canal obturation, the operating temperature was set at180℃with sealers.

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CLC: > Medicine, health > Oral Sciences > Oral medicine > Therapy
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