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Lecture 01082024

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40 Questions

What are the signs of overloading and forces mentioned in the text?

PDL thickening mobility

Which is NOT mentioned as a consequence of restorative failure in dental implants?

Bacterial infection

How are compressive forces described in relation to dental implants in the text?

Forces directed down the long axis of the tooth

What role does cortical bone play in handling compressive forces in dental implants?

Strengthens the implant under compression

Which type of forces are best tolerated and accommodated by dental implants, according to the text?

Vertical compressive forces down the long axis

What is the most common cause of screw loosening in dental implants?

Excessive chewing forces

Which of the following is the most likely consequence of screw loosening in a dental implant?

Increased risk of peri-implantitis

Which of the following dental implant surface treatments is most effective in reducing the risk of screw loosening?

Sandblasted and acid-etched surface

What is the most likely consequence of a dental implant becoming misaligned or maloccluded over time?

Increased risk of screw loosening and implant failure

Which of the following is the most effective strategy to prevent screw loosening in dental implants?

Ensuring proper implant placement and occlusal adjustment

What is a potential consequence of the lack of a periodontal ligament around a dental implant?

Reduced stability and increased risk of failure

What is the primary issue with movement in a dental implant?

It indicates a failed implant that needs removal

In the context of dental implants, what is the significance of an angulation error during placement?

It can cause the implant to deviate from the intended location

What is the potential issue illustrated by the example of a dental implant contacting an adjacent tooth?

Potential for malocclusion and occlusal interference

What is a common cause of screw loosening in dental implants?

Excessive occlusal forces and malocclusion

What is the main reason that the hex connection in an implant is the weakest part of the implant-crown interface?

The hex takes up too much space within the body of the implant, weakening it.

If the implant crown is not properly aligned with the anti-rotational component of the implant, what is the most likely consequence?

The crown will be more prone to side-to-side grinding forces.

What is the primary reason that dental implants do not have a periodontal ligament like natural teeth?

Implants are anchored directly into the jawbone, not suspended by a ligament.

If an implant crown becomes loose or experiences screw loosening, what is the most likely consequence for the patient's occlusion (bite)?

The patient's bite will become more uneven and cause malocclusion.

What is the primary purpose of the anti-rotational component in a dental implant system?

To prevent the implant from rotating or moving sideways within the jawbone.

What was the primary cause of the dental implant failure in the case described?

The implant was placed too closely to the adjacent tooth, invading the periodontal ligament.

What was the immediate consequence of the improper implant placement in this case?

The patient experienced severe pain and swelling after the anesthesia wore off.

Which of the following is the most likely long-term consequence of the screw loosening caused by the improper implant placement in this case?

The patient will experience malocclusion and difficulty chewing.

How could the dentist have prevented the complications described in this case?

By placing the implant further away from the adjacent tooth.

What is the most important lesson that can be learned from this case?

Proper planning and precise execution are critical for successful dental implant outcomes.

Which force is most likely to cause screw loosening or failure in a dental implant?

Shear or sliding force at an angle to the implant

What is a common cause of shear forces acting on a dental implant?

Bruxism or grinding habits that create side-to-side movements

Which of the following is least likely to contribute to screw loosening in a dental implant?

Compressive forces along the long axis of the implant

What is a potential consequence of screw loosening in a dental implant?

Implant failure or loss of osseointegration

Which statement best describes the role of implant dimensions in relation to screw loosening?

Narrower implant diameters may be more prone to screw loosening

What is the most common first sign that something is going wrong with a dental implant?

Screw loosening

What is the typical dentist's initial response when a patient reports a loose implant screw?

Tighten the screw and send the patient on their way

According to the passage, what is the most common reason for implant screw loosening?

Malocclusion and improper occlusal adjustment

What is the recommended course of action if a patient continues to experience loose implant screws after repeated tightening?

Adjust the occlusion and monitor the implant

Which of the following is NOT a potential consequence of implant screw loosening mentioned in the passage?

Increased risk of peri-implantitis

According to the passage, which implant design is more susceptible to screw loosening compared to others?

External hex implants

What is the primary purpose of properly adjusting the occlusion on a dental implant restoration?

To prevent screw loosening

If a patient reports a loose implant screw, what is the LEAST appropriate initial response for the dentist?

Immediately replace the entire implant

Which of the following is a key reason why it is important to identify and address the cause of implant screw loosening?

To prevent future complications with the same implant

What is the primary purpose of tightening a loose implant screw according to the passage?

To prevent further damage to the implant components

Study Notes

Forces and Dental Implants

  • PDL (Periodontal Ligament) thickening and mobility occur with signs of overloading and forces, leading to restorative failure in natural dentition and implants.
  • Screw loosening, fracture, and prosthesis fracture are signs of implant failure, with some being reversible and others not.
  • The goal is to minimize stresses transferring to the implant through treatment planning.

Factors Affecting Load Bearing Capacity

  • Compressive forces, directed down the long axis of the tooth, are well tolerated and accommodated best.
  • Cortical bone is strongest in compression and weakest in shear.
  • The interface of the implant and connection (abutment connection) should be considered in relation to bone.

Implant Design and Evolution

  • Early implant designs, such as the blade implant (1960s-1970s), had a 70% success rate, which was considered good at the time.
  • Modern implant designs include cylindrical, smooth-surfaced, coated, and screw types.
  • The bone is in intimate contact with a dental implant, unlike a natural tooth with a periodontal ligament.

Placing Dental Implants

  • Angulation error during implant placement can lead to a significant difference in the final position of the implant.
  • An anti-rotational component is essential to prevent sideways movement and ensure proper restoration.
  • The hex is the weakest area in the implant body connection, making it susceptible to failure.

Implant Failure and Consequences

  • Improper implant placement can lead to invasion of the periodontal ligament and touch the surface of the adjacent tooth, causing antibiotic problems and requiring a root canal.
  • Bad forces on implants include tensile (pulling) and shear (sliding) forces, which can cause damage and failure.
  • Occlusion off-axis can lead to shear forces and damage.

Shape and Dimension of Implants

  • Implant shape and dimension can affect the forces placed on the crown, with varying widths (3-7mm) and lengths.
  • Angulation and direction of forces are crucial for proper restoration and prevention of failure.

Failure Signs and Prevention

  • Screw loosening is a common first sign of implant failure, often due to malocclusion.
  • Identifying and addressing the cause of failure is essential for proper restoration and prevention of future failure.

Learn about the differences between dental implants and natural teeth, such as the lack of a periodontal ligament and the intimate contact of bone with the implant. Understand the potential consequences for long-term stability and susceptibility to bacterial issues.

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