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Title:	Durability of self-adjusting file (SAF) in simulated clinical use
Authors:	Siti Mariam Hj. Morad (P57833)
Supervisor:	Wan Noorina Wan Ahmad, Dr.
Keywords:	Self-adjusting file Clinical Dentistry -- Equiment and supplies Dissertations, Academic -- Malaysia Universiti Kebangsaan Malaysia -- Dissertations
Issue Date:	26-Dec-2013
Description:	This study aimed to evaluate durability of Self-Adjusting File (SAF) in preparing root canals of different curvatures. A total 47 SAF were divided into 5 groups and operated in mesial canals of extracted lower molars with different angle(α) and radius(r) of curvatures: Group A (α=20-400, r<6mm), Group B (α=20-400, r>6mm), Group C (α>400,r<6mm), Group D (α>400,r>6mm) and Group E (control) (α<200). The file was operated in one canal for maximum of four minutes. Every one minute the file was removed from the canal and visualized under Dental Operating Microscope to detect any mechanical failures: fracture or deformation. If there was no failure, the operation resumed with the same file in the same canal. After four minutes, if the file was still intact, it was operated in the new canal and the procedures continued. If failure detected at any time, the experiment was stopped immediately. The new SAF was used in a new canal and the experiment repeated. The time when the first mechanical changes occurred was recorded and this file was re-assessed under both Stereo Microscope (SM) and Scanning Electron Microscope (SEM) respectively. The results showed that SAF operated in Group E (straight canal) had the highest durability of 19 minutes followed by Group D (7.2 minutes), Group C (7.0 minutes), Group B (5.7 minutes) and Group A (4.9 minutes). There was significant difference between Group E and other experimental groups at P=0.0001. However, there were no significant differences among the experimental groups (P>0.05). Prevalence of file failure occurred most commonly on the middle part. SEM images of fractured surfaces revealed brittle and ductile failure. In conclusion, SAF is more durable to be used in straight canal rather than in canal with moderate and severe curvature.,Tujuan kajian ini dijalankan adalah untuk menilai ketahanan alat-kikir Self-Adjusting (SAF) di dalam penyediaan kanal akar yang berbeza bentuk kelengkungan. Sebanyak 47 batang SAF dibahagikan kepada 5 kumpulan untuk penyediaan kanal mesial gigi molar rahang bawah yang mempunyai bilang sudut (α) dan radius(r) akar yang berbeza: Kumpulan A (α=20-400, r<6mm), Kumpulan B (α=20-400, r>6mm), Kumpulan C (α>400,r<6mm), Kumpulan D (α>400,r>6mm) and Kumpulan E (kawalan) (α<200). Setiap kikir beroperasi selama 4 minit maksimum untuk setiap kanal. Pada setiap minit, kikir akan diperiksa di bawah Dental Operating Microscope untuk mengesan sebarang kerosakan sama ada, terdapat kepatahan atau pengherotan berlaku. Sekiranya tiada kerosakan, operasi diteruskan dengan kikir yang sama pada kanal yang sama. Selepas 4 minit, jika fail masih dalam keadaan baik, ia akan digunakan untuk kanal yg seterusnya sehingga kerosakan dikesan. Jika kerosakan dikesan pada bila-bila masa, operasi akan dihentikan serta-merta. Kikir yang baru akan digunakan pada kanal yang seterusnya di mana prosedur yang sama akan diulangi. Masa di mana kerosakan pada kikir dikesan dicatitkan dan kikir yg rosak tersebut akan dinilai semula di bawah Stereo Microscope (SM) and Scanning Electron Microscope (SEM). Keputusan menunjukkan kikir yg digunakan di dalam Kumpulan E mempunyai ketahanan yang paling lama diikuti dengan Kumpulan D (7.2 minutes), Kumpulan C (7.0 minutes), Kumpulan B (5.7 minutes) dan Kumpulan A (4.9 minutes). Terdapat perbezaan signifikan antara Kumpulan E dengan semua kumpulan experimental sebanyak P=0.0001. Walaubagaimanapun tiada perbezaan signifikan antara kumpulan-kumpulan experimental tersebut. Prevalens lokasi kekerapan berlaku kegagalan adalah pada bahagian tengah kikir. Analisis menggunakan SEM ke atas permukaan yg patah menunjukkan fail-fail tersebut mengalami kegagalan mulur dan rapuh. Kesimpulannya, SAF mempunyai ketahanan yang tinggi jika digunakan pada kanal yang lurus berbanding kanal yang melengkung. Pada gigi yang berbilang akar yang mempunyai kanal yang lurus, sebatang SAF adalah mencukupi manakala untuk kanal yang bengkok lebih daipada sebatang SAF diperlukan bagi menyediankan kanal.,Doctor in Clinical Dentistry (Restorative)
Pages:	76
Call Number:	WU26.S6238d 2014 9 tesis
Publisher:	UKM, Kuala Lumpur
Appears in Collections:	Faculty of Dentistry / Fakulti Pergigian

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