The effect of various thread designs on the initial stability of taper implants

STATEMENT OF PROBLEM. Primary stability at the time of implant placement is related to the level of primary bone contact. The level of bone contact with implant is affected by thread design, surgical procedure and bone quality, etc. PURPOSE. The aim of this study was to compare the initial stability of the various taper implants according to the thread designs, half of which were engaged to inferior cortical wall of type IV bone(Group 1) and the rest of which were not engaged to inferior cortical wall(Group 2) by measuring the implant stability quotient(ISQ) and the removal torque value(RTV). MATERIAL AND METHODS. In this study, 6 different implant fixtures with 10 mm length were installed. In order to simulate the sinus inferior wall of type IV bone, one side cortical bone of swine rib was removed. 6 different implants were installed in the same bone block following manufacturer s recommended procedures. Total 10 bone blocks were made for each group. The height of Group 1 bone block was 10 mm for engagement and that of group 2 was 13 mm. The initial stability was measured with ISQ value using Osstell and with removal torque using MGT50 torque gauge. RESULTS. In this study, we found the following results. 1. In Group 1 with fixtures engaged to the inferior cortical wall, there was no significant difference in RTV and ISQ value among the 6 types of implants. 2. In Group 2 with fixtures not engaged to the inferior cortical wall, there was significant difference in RTV and ISQ value among the 6 types of implants(P < .05). 3. There was significant difference in RTV and ISQ value according to whether fixtures were engaged to the inferior cortical wall or not(P < .05). 4. Under-drilling made RTV and ISQ value increase significantly in the NT implants which had lower RTV and ISQ value in Group 2(P < .05). CONCLUSIONS. Without being engaged to the inferior cortical wall fixtures had initial stability affected by implant types. Also in poor quality bone, under-drilling improved initial stability

Examination Of Elementary Teacher Candidates' Perception Of The Concept Of Philosophy Through Metaphor Analysis

The purpose of this study is to determine the perceptions of elementary teacher candidates with regards to philosophy. For this purpose, metaphors have been utilized as qualitative data collection tools. Metaphors developed by 67 teacher candidates have been subjected to content analysis and separated into 11 categories. Teacher candidates consider philosophy to be important in our lives. Together with this, metaphors developed by teachers demonstrate that there are problems in the perception of the concep of "philosophy". Emphasis should be put on philosophy education in primary education and teacher education. (C) 2012 Published by Elsevier Ltd. Selection and/or peer review under responsibility of Prof. Dr. Huseyin UzunboyluWo

Views Of Primary School Teachers On Philosophy Books Prepared For Children

The purpose of this study is to determine the views of primary school teachers on which properties philosophy books prepared for children aged between 6 and 12 should have. A total of 6 primary school teachers have analyzed 7 philosophy books within the framework of 5 questions determined by utilizing the properties of philosophy for children. According to the teachers, philosophy studies with children should start at an early age and teachers should be trained in this field. Philosophy activities conducted with children, research, and teacher, parent, and child opinion should be guiding in the preparation of these books. (C) 2013 The Authors. Published by Elsevier Ltd.Wo

An Adenomatoid Odontogenic Tumor with Unusual Clinical Features

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