IMPLANT FAILURES

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Questions and Answers

What is the main complication that arises due to the difference in mobility between a tooth and an implant?

Class 1 lever formation (correct)

Implant fracture

Restorative failure

Bone loss

What is the result of a poorly fitting implant framework?

Bone gain

Mechanical complications (correct)

Improved occlusal scheme

Reduced microbial population

What is the consequence of an improper fit of abutment?

Decreased microbial population

Bone loss and rapid screw-joint failure (correct)

Rapid screw-joint success

Improved implant mobility

What is the guideline for infraocclusion in implant-supported restorations?

Up to 30 microns Signup and view all the answers

Why is it important to avoid balancing contacts on cantilevers?

To prevent mechanical complications Signup and view all the answers

What is the relationship between occlusal table width and implant diameter?

Occlusal table width is directly proportional to implant diameter Signup and view all the answers

What is the consequence of an improper occlusal scheme?

Increased mechanical complications Signup and view all the answers

What is a sign of a failing implant?

Tenderness to percussion or torque forces Signup and view all the answers

What is the first step in treating a failed implant?

Verify fixture mobility by removing any abutments and superstructures Signup and view all the answers

What is a possible cause of a failing implant?

Overheating of bone at the time of surgery Signup and view all the answers

What is the purpose of radiographic evaluation in implant diagnosis?

To diagnose loose abutment screw Signup and view all the answers

What is the significance of a 'dull' percussion sound in implant diagnosis?

It indicates a failed implant Signup and view all the answers

What is the primary concern when dealing with an improper occlusal scheme in implant restoration?

Functional overload Signup and view all the answers

What is the primary concern when dealing with an improper fit of abutment in implant restoration?

Inadequate screw joint closure Signup and view all the answers

What is the recommended method to remove a fractured abutment screw?

Applying counterclockwise circular motion with slight apical pressure Signup and view all the answers

What is a common indication for removing a healing abutment?

Radiographic evaluation of a loose healing abutment Signup and view all the answers

What is the likely cause of a loose bar?

Improper fit of the abutment Signup and view all the answers

What is the recommended step after removing a fractured abutment screw?

Replace the abutment and screw, and verify seating with a radiograph Signup and view all the answers

What is the goal of retorquing the abutment screw?

To ensure proper seating of the abutment Signup and view all the answers

What is the recommended tool for tightening the abutment screw?

Abutment driver Signup and view all the answers

What is the likely diagnosis for a loose bar with poor seating of the abutment?

Loose or fractured abutment screw Signup and view all the answers

What is the recommended solution for a slightly sensitive but perfectly immobile implant?

Cover the implant for 2-3 months and test again Signup and view all the answers

Why might an implant be painful and mobile?

Lack of integration Signup and view all the answers

What could be the cause of difficulty inserting a transfer screw, gold screw, or healing cap?

Damaged inner thread of abutment screw Signup and view all the answers

What might be the consequence of traumatic placement of an implant?

Granulation tissue around the implant head Signup and view all the answers

What is a possible solution for inability to perfectly connect the abutment to the implant?

Place a local anesthesia, use a bone mill with guide, remove the bone, clean with saline solution, and replace the abutment Signup and view all the answers

What is the solution for an implant that is slightly sensitive but perfectly immobile?

Cover the implant for 2-3 months and test again Signup and view all the answers

What is a possible cause of an implant being painful and mobile?

Lack of integration Signup and view all the answers

What is a possible consequence of traumatic placement of an implant?

Granulation tissue around the implant head Signup and view all the answers

What is the recommended solution for an inability to perfectly connect the abutment to the implant?

Place a local anesthesia, use a bone mill with guide, remove the bone, clean with saline solution, and replace the abutment Signup and view all the answers

Study Notes

Complications in Implant Dentistry

Pier abutments can lead to complications due to differences in mobility between teeth and implants, resulting in two situations: implant as pier (acting as a class 1 lever) or tooth as pier (acting as a living pontic or pontic with a root).

Etiology: Restorative Factors

Lack of passive fit between the framework and underlying fixtures can cause mechanical complications, such as loose screws or fractured components.
Improper fit of abutment-fixture interface can lead to increased microbial population, bone loss, and rapid screw-joint failure.
Improper occlusal scheme can cause complications; guidelines to follow include:
- Infraocclusion up to 30 microns of implant-supported restoration
- No balancing contacts on cantilevers
- No guidance on single implants
- Freedom in centric
- Occlusal table directly proportional to implant diameter
- Narrow occlusal width

Fractured Abutment Screw

Treatment involves:
- Unscrewing the fragment with an explorer
- Replacing with a new abutment and screw
- Verifying seating with a radiograph prior to final torque
- Replacing the prosthesis and securing with new retention screws

Loose Healing Abutment

Radiographic evaluation is necessary
Treatment involves replacing the healing abutment

Loose Bar

Radiographic evaluation confirms poor seating of the abutment
Clinical evaluation after removal of the bar indicates a loose abutment screw
Treatment involves:
- Retorqueing the abutment screw
- Replacing the bar and torquing prosthetic screws

Loose Restoration

Radiographic evaluation reveals a small opening at the abutment-implant interface
Treatment involves:
- Loosening the screw and removing the restoration
- Inspecting the implant hex for damage
- Inspecting the restoration for damage
- Replacing the restoration and securing with the same screw or a new screw

Fixture Loss

Failing implant: clinical signs include progressive bone loss, soft tissue pockets, bleeding on probing, tenderness to percussion or torque forces
Causes of failing implant: overheating of bone during surgery, lack of initial stability, inadequate screw joint closure, functional overload, periodontal infection
Treatment: remove prosthesis and abutments, irrigate with Peridex, ultrasonically clean and disinfect components, reinsert with proper screw torque, recheck passive fit of framework and occlusion
Failed implant: clinical signs include mobility, dull percussion sound
Treatment: remove the implant

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Description

Learn about the complications of pier abutments in dentistry, specifically the differences in mobility between teeth and implants, and how they relate to class 1 levers.