Biomechanical finite-element investigation of the position of the centre of resistance of the upper incisors

Reimann, Susanne; Keilig, Ludger; Jäger, Andreas; Bourauel, Christoph

doi:10.1093/ejo/cjl086

Cited by 84 publications

(63 citation statements)

References 25 publications

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“…Thickness of the PDL was determined to be a uniform 0.2 mm. [15][16][17] An appliance with 0.018-in bracket slots and an 0.018 ϫ 0.025-in stainless steel archwire was generated. All brackets were sited on the facial-axis points.…”

Section: Three-dimensional Finite Element Modelmentioning

confidence: 99%

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Optimal Loading Conditions for Controlled Movement of Anterior Teeth in Sliding Mechanics

Tominaga

Tanaka

Koga

et al. 2009

The Angle Orthodontist

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Objective: To determine optimal loading conditions such as height of retraction force on the power arm and its position on the archwire in sliding mechanics. Materials and Methods: A 3D finite element method (FEM) was used to simulate en masse anterior teeth retraction in sliding mechanics. The degree of labiolingual tipping of the maxillary central incisor was calculated when the retraction force was applied to different heights of a power arm set mesial or distal to the canine. Results: When the power arm was placed mesial to the canine, at the level of 0 mm (bracket slot level), uncontrolled lingual crown tipping of the incisor was observed and the anterior segment of the archwire was deformed downward. At a power arm height of 5.5 mm, bodily movement was produced and the archwire was less deformed. When the power arm height exceeded 5.5 mm, the anterior segment of the archwire was raised upward and lingual root tipping occurred. When the power arm was placed distal to the canine, lingual crown tipping was observed up to a level of 11.2 mm. Conclusions: Placement of the power arm of an archwire between the lateral incisor and canine enables orthodontists to maintain better control of the anterior teeth in sliding mechanics. Both the biomechanical principles associated with the tooth's center of resistance and the deformation of the archwire should be taken into consideration for predicting and planning orthodontic tooth movement.

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Section: Three-dimensional Finite Element Modelmentioning

confidence: 99%

“…16,17 In order to simplify the model and to reduce the time for analysis, the same properties were given to the archwire, power arm, and bracket. The structures of tooth, alveolar bone, and PDL were modeled as being homogenous and isotropic for the same reason.…”

Section: Materials Parametersmentioning

confidence: 99%

Optimal Loading Conditions for Controlled Movement of Anterior Teeth in Sliding Mechanics

Tominaga

Tanaka

Koga

et al. 2009

The Angle Orthodontist

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“…[2][3][4][5] When using mini-implants to retract the anterior teeth, it is most important to consider the location of the center of resistance (CR) relative to the location of the mini-implants. [6][7][8][9][10][11][12][13] Successful bodily translation of the anterior teeth might require additional complicated archwires or a supplementary mini-implant in the anterior segment. 13 If bilateral mini-implants are not in the same horizontal plane, as sometimes required by the anatomy of the maxilla, the clinician could see unwanted canting of the occlusal plane because of the different vectors of forces during retraction.…”

mentioning

confidence: 99%

Factors controlling anterior torque during C-implant-dependent en-masse retraction without posterior appliances

Kim

Sung

et al. 2011

American Journal of Orthodontics and Dentofacial Orthopedics

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“…6 The C R of the incisors was reported lie between lateral incisors and canines, which is the choice of force application point if minimum flaring is aimed. 18,19 However, our study groups had upright incisors and the labial movements of the incisal edges were needed. Thus the force was applied more anteriorly and no cinch back was incorporated to the CIA, distal to the molar tubes.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the Treatment Effects of Two Intrusive Mechanics: Connecticut Intrusion Arch and Mini-Implant

Gürlen¹,

Aras²

2016

Turkiye Klinikleri J Dental Sci

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A AB BS S T TR RA AC CT T O Ob bj je ec ct ti iv ve e: : The aim of this study was to compare the treatment efficiencies and root resorption amounts of two different incisor intrusion mechanics. M Ma at te er ri ia al l a an nd d M Me et th ho od ds s: : Thirty-two patients with deep bite and elongated maxillary incisors were randomly allocated two treatment groups: Connecticut intrusion arch group (CG) or Mini-implant group (MG). In both groups approximately 60 g of force applied between central and lateral incisors. Dentoalveolar effects were studied via cephalograms taken before and after 5 months of intrusion while root resorption was assessed using periapical roentgens. Paired t-test was used to evaluate differences within groups. The changes observed in both groups were compared by using independent t-test. R Re es su ul lt ts s: : While the overbite reduced significantly in both groups (p<0.001), this amount was greater in MG (p<0.01). The center of resistance (CR) of incisors showed significant apical movement (p<0.001) in both groups with greater values observed in MG (P<0.05). The labial tipping and sagittal advancement of the incisor edge was significant in the treatment groups (p<0.001); these changes were greater in MG. Apex of the central incisor displayed significant backwards movement (p<0.05) with no intergroup difference (p>0.05). Incisors in both groups showed significant root resorption (P<0.000) which was significantly greater in MG compared to CG (P<0.05). C Co on nc cl lu us si io on n: : Mini-implants were more efficient in bite-opening. However they also led to more root resorption and labial tipping compared with the Connecticut intrusion arch.K Ke ey y W Wo or rd ds s: : Tooth movement; Connecticut; orthodontic anchorage procedures Ö ÖZ ZE ET T A Am ma aç ç: : Bu çalışmanın amacı farklı iki keser intruzyon mekaniğinin tedavi etkinliği ve kök rezorpsiyonu miktarı yönünden karşılaştırılmasıdır. G Ge er re eç ç v ve e Y Yö ön nt te em ml le er r: : Derin kapanış ve uzamış maksiller kesicilere sahip 32 hasta rastgele iki tedavi grubuna ayrıldı: Connecticut intrüzyon arkı grubu (CG) veya mini-implant grubu (MG). Her iki grupta santral ve lateral kesiciler arasından yaklaşık 60 g kuvvet uygulandı. Dentoalveolar etkiler keser intruzyonundan önce ve 5 ay sonra alınan sefalometriler ile değerlendirilirken kök rezorpsiyonu periapikal filmlerle değerlendirildi. Eşle-ştirilmiş t-testi ile grup içindeki farklar analiz edildi. Her iki gruptaki değişimler bağımsız ttesti ile karşılaştırıldı. B Bu ul lg gu ul la ar r: : Her iki grupta overbite anlamlı miktarda düşerken (p<0.001), bu miktar mini-implant grubunda daha fazla idi (p<0.01). Keserlerin direnç merkezi (CR) miniimplant grubunda daha fazla değerde olmakla birlikte her iki grupta da önemli düzeyde apikale yer değiştirdi (p<0.001). Labial devrilme ve kesici kenarının sagittal ilerlemesi tedavi gruplarında önemli bulunurken (p<0.001), bu değişiklikler miniimplant grubunda daha fazla idi. Santral kesicilerin apeksleri gruplar arası fark olmaksızın...

show abstract

Biomechanical finite-element investigation of the position of the centre of resistance of the upper incisors

Cited by 84 publications

References 25 publications

Optimal Loading Conditions for Controlled Movement of Anterior Teeth in Sliding Mechanics

Optimal Loading Conditions for Controlled Movement of Anterior Teeth in Sliding Mechanics

Factors controlling anterior torque during C-implant-dependent en-masse retraction without posterior appliances

Comparison of the Treatment Effects of Two Intrusive Mechanics: Connecticut Intrusion Arch and Mini-Implant

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