透明アライナー処理における回転前頭部での固定位置の有効性:有限要素研究
1Department of Orthodontics, Faculty of Dentistry, Yeditepe University, Bagdat Cad. No:238, Kadiköy, Istanbul, 34728, Turkey.
BMC oral health
|August 26, 2025
まとめ
アタッチメントは,回転したプレモラーを矯正するためのクリアアライナー有効性を大幅に改善します. 歯の動きとアライナー変形を最大限に抑えながら 歯周関節へのストレスを最小限にします
科学分野:
- 矯正歯科
- バイオ材料工学
- 有限要素分析
背景:
- クリア アライナー は 矯正 治療 に より 多く 用い られ て い ます.
- 固定装置の設計と配置を最適化することは 予測可能な歯の動きに不可欠です
- ローテッド・プレモラーでは クリアアライナーによる治療が困難です
研究 の 目的:
- 透明なアライナーを使用して,垂直直角形およびベーベルの垂直直角形の固定装置の回転前立矯正への影響を評価する.
- 有限要素解析を用いて異なる固定位置 (口腔,言語,両方) を比較する.
主な方法:
- 下歯,歯周関節,および付属体をシミュレートした3D有限要素モデルが作成されました.
- 7つのシナリオでは,様々な位置にある2種類の固定装置と固定装置を比較した.
- アライナーアクティベーション (1.2°) を適用し,歯の移動,ストレスの分布,アライナー変形を分析した.
主要な成果:
- アタッチメントは,アタッチメントなしと比較して,回転矯正の有効性を高めました.
- 歯と舌の両面の垂直長方形の固定装置は,最も高い歯の移位 (35 μm) を生み出しました.
- この構成は,最も明確なアライナー変形 (88.97 μm) と歯周関節張力 (0.05279 MPa) をもたらしました.
結論:
- 固定装置は,固定装置のないシナリオよりも,回転の修正に有効です.
- 特に口口や舌口で 置かれた場合 歯の動きやアライナー変形を増加させます
- アタッチメントの設計と配置は,治療結果と生体力学的反応に大きな影響を与えます.
関連する概念動画
Rotational Motion about a Fixed Axis
1.9K
A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
1.9K
Angle of Twist - Elastic Range
923
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
923
Angle of Twist: Problem Solving
870
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
870
Residual Stresses in Circular Shafts
680
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...
680
Transformation of Plane Stress
912
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
912
Conservation of Mass in Fixed, Nondeforming Control Volume
1.4K
The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
In the case of a sewer pipe, which can be modeled...
1.4K


