الفهرس 
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Abstract
The clinical measurement that assesses primary implant stability is insertion torque (IT). High IT indicates that the implant is well fixed and mechanically stable within the bone tissue.
It is generally accepted that implants with a torque of at least 20 Ncm display a survival rate higher than ones with a lower insertion torque. The available data do not definitively indicate the optimal value of torque required to obtain good primary stability. However, it is clear that torque value has a direct relationship with the initial bone-implant contact (BIC) value.
Highest recorded peak insertion torque values generally range from 50 to approximately 70 Ncm.
The aim of this study was to evaluate the outcome of immediately loaded single posterior mandibular implants inserted with high insertion torques (> 70 Ncm).
This study was carried out as a randomized Controlled clinical trial on twelve patients with missed mandibular posterior teeth.
Zimmer SwissPlus implant system was used in this study, a total of 14 Implants were inserted using Aseptico motor implant system, insertion torque was measured digitally, then cases were classified into two groups
• Control group (25-35Ncm)
• Study group (> 70 Ncm)
Implants were immediately loaded with acrylic crowns after surgery, final crowns were placed after 3 months.
• CBCT radiographs were taken preoperatively.
Periapical x-rays were taken immediate post-operative and after 3 & 6 months.
• CBCT radiographs were taken after 3 & 6 months.
The data were collected and entered into the personal computer. Statistical analysis was done using Statistical Package for Social Sciences (SPSS/ version 18) software.
Based on the results of this study, the values of insertion torque do not affect bone healing, and there are no radiologic signs of bone necrosis for values of insertion torque above 70Ncm.
Thus it may be concluded that high peak insertion torque is considered advantageous in improving primary stability.