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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Screw: Problem Solving01:21

Screw: Problem Solving

In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the shaft's...

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Related Experiment Video

Updated: Jun 2, 2026

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
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Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

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Screw spreading: technical considerations and case report.

Renato Sussumu Nishioka1, Alberto Noriyuki Kojima

  • 1Department of Dental Materials and Prosthodonctics, Dental School of São Jose dos Campos, São Paulo State University (UNESP), São Paulo, Brazil. anorikojima@hotmail.com

The International Journal of Periodontics & Restorative Dentistry
|April 15, 2011
PubMed
Summary

This study explores a new method for preparing the maxillary bone for dental implants called the spreading system. Instead of using the traditional Summers osteotome, the spreading system uses a special screw instrument to gently expand the bone. This technique compresses the inner bone against the outer wall, increasing bone density and providing better support for implants. The study found that this method is less invasive and more predictable than older techniques. A case report showed successful implant placement using this system. The results suggest that the spreading system could be a reliable alternative for dental implant site preparation.

Keywords:
dental implant site preparationmaxillary bone augmentationspreading systemcontrolled bone dilation

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Area of Science:

  • Dental implantology
  • Maxillofacial surgery
  • Bone augmentation techniques

Background:

Dental implant placement in the maxilla often requires augmentation to ensure sufficient bone density. Traditional methods like the Summers osteotome have been widely used but may involve more invasive steps. A gap remains in understanding less invasive alternatives that maintain structural integrity while enhancing implant stability. Prior research has shown that bone density is crucial for long-term success of implants. However, the specific role of horizontal bone dilation in improving implant site conditions is less explored. No prior work had resolved how controlled dilation might affect initial implant stability. This uncertainty drove the investigation into alternative spreading techniques. The need for a predictable and less invasive augmentation method motivated the development of new tools and procedures.

Purpose Of The Study:

This study aimed to evaluate the effectiveness of a spreading system as an alternative to the Summers osteotome in dental implant site preparation. The specific problem addressed is the need for a less invasive yet reliable method to expand the alveolar crest. The motivation stems from the desire to improve initial implant stability through enhanced bone density. The spreading system was tested for its ability to provide controlled dilation. The study focused on whether this technique could achieve predictable outcomes. The researchers sought to determine if the spreading system could replace traditional methods. They also examined the system's role in improving implant site conditions. The goal was to establish the spreading system as a viable alternative.

Main Methods:

The spreading system was evaluated using a specific screw instrument called the 'spreader.' The procedure involved compressing the medullary bone against the cortical wall to expand the facial wall. The study followed a clinical approach to assess the system's performance. Bone density was measured to evaluate initial implant stability. The spreading system was compared to traditional osteotome techniques. The focus was on controlled and standardized dilation of the bone. The researchers analyzed the predictability of the spreading system. The study also included a case report to demonstrate practical application.

Main Results:

The spreading system achieved controlled and standardized bone dilation. The procedure improved the density of the maxillary bone. This enhancement allowed for greater initial stability of dental implants. The spreading system was found to be a highly predictable method. The facial wall expansion occurred without significant complications. The medullary bone was compressed against the cortical wall effectively. The case report demonstrated successful implant placement using this technique. The results suggest that the spreading system is a reliable alternative.

Conclusions:

The spreading system offers a less invasive alternative to the Summers osteotome. The procedure improves bone density and initial implant stability. The use of the spreader allows for controlled and standardized dilation. The study suggests that this technique is highly predictable. The case report supports the clinical application of the spreading system. The findings propose that the spreading system can replace traditional methods. The results align with the goal of improving implant site conditions. The authors suggest that this technique is suitable for maxillary augmentation.

The spreading system is an alternative to the Summers osteotome that uses a specific screw instrument to expand the alveolar crest.

The system compresses the medullary bone against the cortical wall, increasing bone density and initial implant stability.

Controlled dilation ensures predictable and standardized bone expansion, which is essential for successful implant placement.

The spreader achieves horizontal dilation of the bone, allowing for controlled expansion of the facial wall.

The case report demonstrated successful implant placement with improved bone density and initial stability.

The spreading system is less invasive and offers a more predictable outcome for maxillary bone augmentation.