Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userIn Vitro Study aboutthe Effect of Dual-Thread and Diameter onthe Orthodontic Miniscrews Primary Stability
دراسة مخبريّة حول تأثير الشكل ثنائي الحلزنة والقطر على الثبات الأولي للزريعات التقويمية
1336
0 18
0
(
0
)
Added by
Tishreen University ورقة بحثية
Publication date
2014
fields
Dentistry
and research's language is
العربية
Created by
Shamra Editor
Ask ChatGPT about the research
تهدف هذه الدراسة إلى تحديد تأثير قطر وتصميم الزريعة على الثبات الأولي بشكل منفرد لكل متغير وبشكل مشترك وتحديد الشكل والقطر الأمثل القابل للاستخدام بالنسبة للزريعات والذي يعطي أفضل ثبات. تتألف العينة من 24 زريعة مصنوعة من خليطة (Ti-6Al-4V) لها شكلان شكل عادي وشكل معدل إذ تكون الحلزنات في الجزء العنقي للزريعة مايكرو مترية أي متقاربة إلى نصف المسافة بين الحلزنات العادية بطول (7 ملم) وأقطار (1,6-1,8 ملم) .تم تقسيم الاختبار إلى ثلاثة أقسام: قياس عزم فتل الإدخال الأعظميMaximum Insertion Torque(MIT). إجراء اختبار Periotest. قياس عزم فتل الإخراج الأعظميMaximum Removal Torque (MRT). أظهرت النتائج أنّ قيم عزم فتل الإدخال والإخراج الأعظمي كانت أكبر وقيم الPeriotest كانت أصغر في الشكل المعدل والقطر 1.8 ملم بدلالة إحصائيّة مهمة منها في الشكل العادي والقطر 1.6ملم (P<(0.01
The aim of the study was to determine the effect of Dual-Thread and diameter on the orthodontic miniscrew primary stability, and define the best shape and diameter of miniescrew can be used to give the best stability. The study sample consisted of (24) orthodontic miniscrews made of (Ti-6Al-4V) alloy with 2 shapes (regular and Dual-Thread) , and 2 diameters (1.6 , 1.8mm). The experiment has been divided into 3 tests : measuring the maximum insertion torque , the Periotest value , the maximum removal torque. The results showed that the maximum insertion and removal torque were statistically higher while the Periotest values were statistically lower when using the Dual-Thread and the diameter of 1.8 mm than the regular shape and the diameter of 1.6 mm(P>0.01)
References used
GRABER TM, VANARSDALL RL. Orthodontics – principles and techniques.second ed. Rio de Janeiro: Guanabara Koogan; 1996
FAVERO L, BROLLO P, BRESSAN E. Orthodontic anchorage with specific fixtures: related study analysis. Am J OrthodDentofacialOrthop 2002;122:84–94
MELSEN, B. and VERNA, C. Miniscrew Implants: The Aarhus Anchorage System. SeminOrthod, Vol 11, 2005, 24-31
NANDA, R. and URIBE, F.A. Temporary Anchorage Devices. Mosby Elsevier, China, 2009
ZHAO L., XU,B Z, YANG Z, WEI X, TANG T, ZHAO Z.Orthodontic mini-implant stability in different healing times before loading: A microscopic computerized tomographic and biomechanical analysis. Oral Surg Oral Med Oral Pathol Oral RadiolEndod 2009;108:196-202
rate research
Read More
There is an increasing role for orthodontic mini implants as an anchorage device in orthodontic practice In many occasions, orthodontists may have to reuse orthodontic mini-implants (re-implanting again ) after sterilizing them by moist heat. The aim
of this research was investigating the effect of re-implantation and moist heat sterilization on the primary fixity of orthodontic mini-implants> Two lengths of mini-implants (6-7mm) (ti – 6A1 – 4A1 ) and two shapes (normal and dual thread ) were used and inserted in artificial bone (saw bone ) a first time and after sterilizing them by moist heat (Autoclave) a second time , in an insertion angle of 90 . The insertion and removal torque and periotest score (periodontium test device ) were measured to assess the primary fixity ( after implanting in the first time and the second time ) The results showed a decrease in the primary fixity after re-implanting and sterilizing by moist heat , but it still enough for using it a second time effectively to provide needed orthodontic anchorage for both two lengths and two shapes.
This study aims to assess the effectiveness of using calcium phosphate bone
cement in increasing the primary stability of orthodontic miniscrews by testing
its resistance to pullout forces.
This study aims to shorten the orthodontic treatment period
into,at least, half the length of time. It takes in order to reduce the
complaints of patients of the length of orthodontic treatment through
the induction of the secretion of prostagland
in E2 topically by
raising the inflammatory process via injection of vitally accepted
materials which are used routinely in daily dental practice,
Lidocaine 2% which leads to the increase of proportion of
osteoclasts and the occurrence of bone absorption in the injected
area ( the area of the tooth to be moved) .
The Objective is to determined whether enamel conditioning with sodium
hypochlorite (5,25%) and EDTA prior to etching was increased shear
bond strength of orthodontic brackets bonded with resin – modified glass
ionomer. our sample consisted of 42 extracted human premolars were
randomly divided into 3 groups.
The purpose of this study was to evaluate the histological effects
after the miniscrew penetration into dental root on dental pulp and
cementum during orthodontic treatment.
suggested questions
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
