Dissertation > Excellent graduate degree dissertation topics show

Basic Studies on High-temperature Injectable Obturation of Thermoplasticized Gutta-percha

Author: LiDongMei
Tutor: BaoGuangJie
School: Lanzhou University
Course: Oral medicine
Keywords: root canal preparation SEM high-temperature thermoplasticized injectable gutta-percha root canal obturation microleakage temperature on root surface
CLC: R781.05
Type: Master's thesis
Year: 2007
Downloads: 64
Quote: 0
Read: Download Dissertation

Abstract


Root canal therapy(RCT) is a preferred treating method for various endodontic and periapical diseases. It includes three-dimensional root canal clearning, shaping and filling. Incomplete sealing is the most important factor leading to endodontic treatment failure. It is highly recommended that thermoplasticized obturation techniques could improve the canal sealing quality , and high-temperature injectable thermoplasticized gutta-percha system(Obtura II) is one of them. The basic study aimed at exploring the most suitable working conditions for Obtura II system.Objectives: To find out a well-matched instrument method for injectable thermoplasticized gutta-percha obturation; to evaluate whether the temperature rise on the root surface would result in thermal damage to periodontal tissues caused by Obtura II system with temperature settings of 160℃, 180℃and 200℃; to investigate whether there were differences of their canal sealing capacities and the effects of sealer usage.Methods: Scanning Electron Microscope(SEM) was used to observe surface cleanliness of root canal walls after being instrumented with three different methods(protaper、K file、profile); after instrumented with the preferred method, root canals were filled with Obtura II system at different temperature settings using canal sealer as control groups. Temperatures on root surfaces were measured using infrared thermal imaging camera during root canal obturation; the extrusion of gutta-percha and the microleakage of root canals were examined and analysed after obturation.Results: There were differences in surface cleanliness of root canal walls among three different instrument methods: hand protaper Ni-Ti instrument was better than stainless steel K file and profile rotory instrument, the difference of debris scale was statistically significant ( P < 0. 05), and the difference of smear layer and open tubules was not statistically significant ( P > 0. 05). The mean temperature rise on the root surfaces was below the critical level of 10℃. The differences in seal abilities between Obtura II system and cold lateral compaction were statistically significant ( P < 0. 05) , while there was no significant difference among three temperature sets(P > 0. 05).Conclusions: Cleanliness of root canal of hand protaper Ni-Ti instrument was better than that of stainless steel K file and profile rotory instrument. Temperature rise generated by Obtura II system did not cause damage to periodontal tissues when temperature settings were at 160℃, 180℃and 200℃. The sealing effect of Obtura II was better than cold lateral compaction, but there was no statistically significant difference in seal ability among three temperature sets. The use of sealer seemed to have no effect on lowering the temperature rise and reducing microleakage.

Related Dissertations

  1. Studies on Sex Pheromone Communication System in Orthaga Achatina Butler,S763.3
  2. The Empirical Research on Higher Educational Scientific Technological Innovation Ability and Regional Economical Development,G644
  3. Experiment Study on the Effect of Hybrid Coat in Closing of Dentinal Tubules,R781.2
  4. To Observe the Effect of Different Dental Filling Technologies on the Microleakage under Confocal Laser Scanning Microscope,R783
  5. Experimental Investigation of Microleakage for Four Binders Applied to Dental Cavities of Class V,R783
  6. The film screenings customer experience impact on customer loyalty empirical research,J943
  7. Based on Image Processing meltblown microfiber diameter Testing Methods,TP274
  8. Evaluation of the Quality of Mtwo NiTi Instruments System in Root Canal Retreatment and the Effects of Root Canal Retreatment on Apical Microleakage,R781.05
  9. The Effect of Beyond Tooth Bleaching on the Resin-enamel Micro-tensil Strength and the Microleakage of Resin Restoration,R783.1
  10. The Effect of Different Root Canal Internal Surface Treatment on Bond Strength of Quartz Fiber Post,R783
  11. Effects of Hybrid Coat Dentin Protective Film on Adhesive Properties of Five Cements in Vitro,R783
  12. Evaluation of Influences on the Sealing Ability in Filled Canals Shaped by Protaper Nickel-titanium Instruments,R781.05
  13. A Comperative Study of Root Canal Sealing Ability of Different Sealing Materials,R781.05
  14. Experimental Study on the Application Three Kinds Glutinous Material to Preventive Restoration,R783
  15. A Study on the Relationships Among Finan Cing Choice, Innovation Strategy and Tech Nological Capability in High-tech Firm,F273.1;F224
  16. The Research of Combined Emulsifiers on Enhancing Frost Resistance of Yeast and Improving Frozen Dough’s Quality,TS213.2
  17. Synthesis of Large Area High Quality Graphene Film by Chemical Vapor Deposition,TB383.1
  18. Pore Structure Characteristics and Durability Analysis of Fiber Reinforced Concrete,TU528.572
  19. Study on New Al-Coated Steel Enamel with Low Firing Temperature and Its Enamel Adherence Mechanism,TQ173.65
  20. Test Research on Characteristic of Solidified Structural Strength Increase for Dredger Fill,TU472.2
  21. A Vitro Study of Air ╟ Abrasio in Primary,R788

CLC: > Medicine, health > Oral Sciences > Oral medicine > Therapy
© 2012 www.DissertationTopic.Net  Mobile