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Register a new userComparison of retention and stability of over denture retainer by two and four implants in the mandibular jaw A vitro study
مقارنة ثبات و استقرار الأجهزة الفوقية المدعومة بزرعتين و أربع زرعات ( دراسة مخبرية )
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هدفت دراستنا لمقارنة ثبات الأجهزة الفوقية المدعومة بزرعتين مع الأجهزة الفوقية المدعومة بأربع زرعات في الفك السفلي باستخدام الوصلات الكروية.
the aim of our study is comparing theretentive and stability forces between mandibular overdentures retained by two implants and mandibular overdentures retained by four implants by using ball attachments.
References used
Felton DA. Edentulism and comorbid factors.JProsthodont. 2009 Feb;18:88-96
Müller F, Naharro M, Carlsson GE. 2007 What are the prevalence and incidence of tooth loss in the adult and elderly population in Europe? Clin Oral Implants Res;18(suppl 3):2– 14
Fiske J, Davis DM, Frances C, Gelbier S. 1998 The emotional effects of tooth loss in edentulous people. Br Dent J;184:90– 93;discussion 79
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It is necessary when designing removable partial dentures to be fixed,
stable and well supported for improving patient comfort, and decreasing
damages on soft tissues and dental abutments, the alveolar ridge has a
strong influence in planning for
treatment and interpretations
biomechanical when treated with removable partial dentures, and have
four shapes in the sagittal plane which are horizontal shape, concave
shape, distal ascending shape and descending shape.
The treatment with implant overdenture is wildly spreading around the globe. The implant overdenture has become a main options when we make our treatment plan . It is spreading world wild with the improvement of implantation systems. In some cases The dentist can not place the implant in the ideal position and angulation.
The apical seal, which is achieved by application of a retrograde
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During the previous decade, resins were widely used in the restoration of posterior teeth, as it was found that wear occurs in the abrasive and adjacent section of resin-based restorations, while in the marginal areas, marginal leakage was observed.
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.
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