Srinivasan, R (2011) Fracture Resistance of Palatal Cusp of maxillary First Premolar Restored with different Core Materials: An Ex Vivo Study. Masters thesis, Ragas Dental College and Hospital, Chennai.
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Abstract
This study was done to determine the fracture resistance of various core materials on endodontically treated maxillary first premolar. The core materials used were composite, bonded amalgam, amalgam, glass ionomer .Natural intact tooth served as a positive control. 48 intact human,non carious, human maxillary premolars were selected.Teeth were cleaned ultrasonically to remove the debris. The teeth were divided into 6 groups of 8teeth each. Teeth in the positive control group were prepared for receiving a full cast metal coronal restoration. In rest of the groups the teeth were endodontically treated, palatal wall removed 1mm from the CEJ, post space preparation done in the palatal root and prefabricated tapered threaded post luted using resin cement.Teeth were restored with different core materials. The groups include: Group II-Composite core, Group III-Bonded amalgam core, Group IV-Amalgam core, Group V-Glass ionomer core, Group VI-Intermediate restorative material (IRM) core. All the teeth were mounted in self-cure acrylic resin,2mm from the CEJ. Crown preparation was done such that 1mm of ferrule was obtained. Vinyl polysiloxane impressions were made. Cast crowns (Ni-Cr) were fabricated and zinc phosphate cement was used to lute these crowns. These samples were incubated and thermocycled. The samples were tested using Instron universal testing machine and the load was placed on the palatal cusp at 30 degree to long axis of the tooth with 2mm/min cross head speed. The load at fracture was recorded as fracture resistance of the core in kgs. The results were analysed using One way Anova and Post Hoc Tukey test. Based on the results obtained from this study, the maximum fracture resistance was recorded by the intact tooth. Among the experimental groups group II (composite core) recorded the maximum fracture resistance. There was no significant difference statistically between the values of group III (bonded amalgam) and group IV (amalgam). IRM core recorded the least value among the experimental groups followed by glass ionomer core. CONCLUSION: Within the limits of the present study the following observations were made: 1. Fracture resistance of intact teeth prepared for full cast metal coronal restoration was the maximum. 2. Among the experimental groups fracture resistance of the composite as core material was the maximum. 3. The fracture resistance obtained by amalgam and bonded amalgam as core materials were not statistically significant. 4. Among the experimental groups the fracture resistance of IRM core was the least followed by glass ionomer core (Ketac molar) From the above findings it can be concluded that when light cured high strength posterior composite was used as core material in one walled and crowned endodontically treated maxillary premolar,the resistance to fracture to obliquely directed eccentric occlusal forces increased. The values of IRM suggests that it should be used only as a temporary restorative core build up material. Further clinical studies under standard experimental conditions are needed in the science of core materials to increase the longevity of endodontically treated teeth.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Fracture Resistance ; Palatal Cusp ; maxillary First Premolar Restored ; different Core Materials ; Ex Vivo study. |
| Subjects: | DENTAL > Conservative Dentistry and Endodontics |
| Depositing User: | Kambaraman B |
| Date Deposited: | 14 May 2018 03:57 |
| Last Modified: | 14 May 2018 03:57 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/7815 |
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