Mechanotherapy in Orthodontics: Types of Tooth Movement Pt. 1

CTOR
8 Sept 202007:48
EducationalLearning
32 Likes 10 Comments

TLDRIn this informative session, Dean Mani Alikhani of CTOR academy discusses the three primary types of tooth movement in orthodontics: displacement, rotation, and tipping. He explains the concept of the center of resistance and center of rotation, which are pivotal in understanding how teeth move in different dimensions. Alikhani also shares a method to determine the center of rotation, emphasizing the importance of these concepts for orthodontic treatment planning.

Takeaways
  • 🦷 There are three main types of tooth movement in orthodontics: displacement, rotation, and tipping.
  • πŸ”„ In displacement, the center of resistance and all points on the tooth move in the same direction and distance.
  • πŸ”„ During rotation, the center of resistance remains stationary while the tooth rotates around it, with points closer rotating less and those farther rotating more.
  • πŸ”„ Tipping is a combination of displacement and rotation, categorized into controlled tipping, uncontrolled tipping, and root movement.
  • πŸ“ The center of rotation is a critical concept in defining tooth movement types, with its location varying depending on the movement type.
  • πŸ“ In pure rotation, the center of resistance and center of rotation coincide, and there is no displacement.
  • πŸ“ For control tipping, the center of rotation is at the apex, as it appears to rotate around this stationary point.
  • πŸ“ Uncontrolled tipping involves a center of rotation between the apex and the center of resistance, where both move in opposite directions.
  • πŸ“ Root movement is characterized by the crown staying stationary while the root moves, with the center of rotation being at the incisal edge.
  • 🀹 To find the center of rotation, use two points on the tooth before and after movement, draw and bisect lines to find the intersection.
  • πŸ“ˆ Different dimensions of tooth movement (e.g., sagittal, occlusal) may involve different types of movements and thus different centers of rotation.
Q & A

  • What are the three categories of tooth movement discussed in the transcript?

    -The three categories of tooth movement discussed are displacement, rotation, and tipping.

  • What happens during displacement of a tooth?

    -During displacement, the center of resistance moves in space, and all points on the tooth move in the same direction with the same distance relative to the center of resistance.

  • How is rotation of a tooth different from its center of resistance movement?

    -In pure rotation, the center of resistance remains stationary, while all points on the tooth rotate around it. Teeth closer to the center of resistance rotate less, while those further away rotate more.

  • What is control tipping in orthodontics?

    -Control tipping is a type of tooth movement where the apex of the tooth stays stationary, giving the impression that the whole tooth rotates around the apex.

  • What characterizes uncontrolled tipping?

    -Uncontrolled tipping is characterized by movement where the apex of the tooth moves in one direction while the crown moves in the opposite direction, rotating around a point between the apex and the center of resistance.

  • How is root movement different from other types of tooth movement?

    -Root movement is distinct as it appears that the incisal edge of the tooth remains stationary while the root moves in a specific direction.

  • What is the significance of the center of rotation in orthodontic tooth movement?

    -The center of rotation is crucial in defining and understanding different types of tooth movements. It helps in visualizing how teeth move in relation to a fixed point, which can be the center of resistance or another stationary point depending on the movement type.

  • How can the center of rotation be determined for a tooth movement?

    -The center of rotation can be found by drawing a line between two points on the tooth before and after movement, then bisecting these lines with perpendicular lines. The point where the perpendicular lines cross is the center of rotation.

  • Is the center of rotation the same for all types of tooth movement?

    -No, the center of rotation varies based on the type of movement and the dimension being considered. It can be the same as the center of resistance in pure rotation or a different point in control tipping and uncontrolled tipping.

  • How do different dimensions of tooth movement affect the center of rotation?

    -Different dimensions of tooth movement, such as bodily movement or displacement in one direction and rotation in another, can have different centers of rotation. The center of rotation is not fixed and changes based on the specific movement and the dimension being analyzed.

  • What is the role of the occlusal view in understanding tooth movement?

    -The occlusal view helps in analyzing how tooth movement occurs in the buccal and palatal costs. It provides insights into how teeth move in relation to the occlusal table and how different types of movements, such as displacement, rotation, or tipping, affect the tooth's position in the occlusal plane.

Outlines
00:00
🦷 Introduction to Types of Tooth Movement

This paragraph introduces Mani Alikhani, dean and professor of orthodontics at CTOR academy, and sets the stage for the discussion on different types of tooth movement. Alikhani categorizes tooth movement into three groups: displacement, rotation, and tipping. Displacement involves the center of resistance moving in space, causing all points on the tooth to move uniformly. Rotation, on the other hand, involves the tooth rotating around its center of resistance without any translation of the center of resistance. Tipping is a combination of the two, with three subtypes: controlled tipping where the apex remains stationary, uncontrolled tipping where the apex and crown move in opposite directions, and root movement where the crown appears stationary while the root moves. Alikhani emphasizes the importance of understanding the center of rotation in describing these movements and introduces a method to find the center of rotation for the tooth movement discussed.

05:01
πŸ“ˆ Tooth Movement in Different Dimensions

In this paragraph, Alikhani explores how tooth movement can vary when viewed from different dimensions, specifically focusing on the sagittal and occlusal views. He explains how displacement and rotation appear in the occlusal view, with the center of resistance and rotation often coinciding for simplicity. When discussing controlled tipping in the occlusal view, one buccal or palatal aspect remains stationary while the rest of the tooth rotates around it. Uncontrolled tipping involves rotation around a point between the center of resistance and one of the tooth aspects. Alikhani clarifies that the center of rotation can differ based on the dimension of movement, unlike the center of resistance, which remains consistent regardless of the view. The paragraph concludes with a call to action for viewers to support the CTOR channel by subscribing and liking their content.

Mindmap
Keywords
πŸ’‘Orthodontics
Orthodontics is a dental specialty that focuses on the diagnosis, prevention, and treatment of dental and facial irregularities. It primarily deals with the straightening of teeth and the correction of bite problems. In the video, the speaker is a professor of orthodontics and discusses various types of tooth movement, which is central to the field's practice.
πŸ’‘Tooth Movement
Tooth movement refers to the process of physically moving or adjusting the position of teeth within the jawbone. It is a fundamental concept in orthodontics and is achieved through various orthodontic appliances. The video categorizes tooth movement into three types: displacement, rotation, and tipping, each with its own significance in treatment planning.
πŸ’‘Displacement
Displacement in the context of orthodontics refers to the linear movement of a tooth, where the center of resistance of the tooth moves in space, and all points on the tooth move in the same direction and distance. It is one of the primary types of tooth movement discussed in the video.
πŸ’‘Rotation
Rotation is a type of tooth movement where a tooth turns around a fixed center of resistance without any linear movement. In orthodontics, pure rotation is characterized by the center of resistance remaining stationary while the tooth rotates around it, with different points on the tooth rotating varying degrees based on their distance from the center.
πŸ’‘Tipping
Tipping refers to the movement of a tooth where the apex, or the tip of the tooth, appears to remain stationary while the crown of the tooth moves. It is a complex type of tooth movement that involves a combination of displacement and rotation. The video outlines three types of tipping: controlled tipping, uncontrolled tipping, and root movement.
πŸ’‘Center of Resistance
The center of resistance is a point on a tooth where the forces acting on the tooth are considered to be concentrated. It is a crucial concept in orthodontics as it helps determine how a tooth will move in response to applied forces. The video discusses how the center of resistance behaves differently during various types of tooth movements.
πŸ’‘Center of Rotation
The center of rotation is a point around which a tooth or any object rotates. In orthodontics, identifying the center of rotation is essential for understanding and predicting tooth movement. The video explains that the center of rotation can vary depending on the type of tooth movement and the dimension being considered.
πŸ’‘Controlled Tipping
Controlled tipping is a specific type of tooth movement in orthodontics where the apex of the tooth appears to stay in a fixed position while the crown of the tooth moves. This controlled movement is desirable in orthodontic treatment as it allows for precise alignment of teeth without unwanted side effects.
πŸ’‘Uncontrolled Tipping
Uncontrolled tipping occurs when both the apex and the crown of a tooth move in opposite directions, resulting in a less predictable and often undesirable tooth movement. This type of movement is common in orthodontics and can lead to complications if not properly managed.
πŸ’‘Root Movement
Root movement is a type of tooth movement where the incisal edge of the tooth appears to stay in place while the root of the tooth moves in a particular direction. This is a specialized orthodontic technique that can be used to achieve specific tooth positioning without affecting the tooth's crown.
πŸ’‘Occlusal View
An occlusal view refers to the perspective of observing the biting surfaces or occlusal surfaces of the teeth. It is an important aspect of dental examination and orthodontic diagnosis, as it provides insights into the relationship between the upper and lower teeth when they areε’¬εˆ together.
Highlights

Mani Alikhani, dean and professor of orthodontics at CTOR academy, introduces the discussion on different types of tooth movement. (0s)

Three categories of tooth movement are identified: displacement, rotation, and tipping. (3s)

In displacement, the center of resistance moves in space, with all points on the tooth moving uniformly. (5s)

Rotation involves the center of resistance remaining stationary, with the tooth's points rotating around it. (8s)

Tipping is a combination of displacement and rotation, categorized into three types: controlled, uncontrolled, and root movement. (11s)

Controlled tipping is characterized by the tooth rotating around its apex, which remains stationary. (14s)

Uncontrolled tipping involves both the apex and the crown moving in opposite directions, rotating around a point between them. (17s)

Root movement in tipping appears as though the crown is stationary while the root moves. (20s)

The concept of the center of rotation is crucial for defining different types of tooth movement. (23s)

In pure rotation, the center of resistance and center of rotations are the same, with no displacement. (26s)

For control tipping, the center of rotation is at the apex, as it appears stationary during the movement. (29s)

In uncontrolled tipping, the center of rotation is between the apex and the center of resistance. (32s)

For root movement, the center of rotation is assumed to be at the incisal edge, as it appears unchanged. (35s)

Displacement or translation can be considered a rotation with the center of rotation at an infinite distance. (38s)

The method to find the center of rotation involves drawing and bisecting lines between two points before and after movement. (41s)

Different types of tooth movement in different dimensions will have different centers of rotation. (44s)

The center of resistance remains consistent regardless of the viewing dimension, unlike the center of rotation. (47s)

Teeth can exhibit different types of movements in different dimensions, such as bodily movement and uncontrolled tipping. (50s)

The center of rotation varies with dimension, emphasizing its dependency on the spatial context of the tooth movement. (53s)

The session concludes with a call to support the CTOR channel by subscribing and liking their content. (56s)

Transcripts

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OrthodonticsTooth MovementDisplacementRotationTippingCenter of ResistanceCenter of RotationDental EducationCTOR AcademyOrthodontic Treatment