Treatment effects of mini-implants for en-masse retraction of anterior teeth in bialveolar dental protrusion patients: A randomized controlled trial

Upadhyay, Madhur; Yadav, Sumit; Nagaraj, K.; Patil, Sameer

doi:10.1016/j.ajodo.2007.03.025

Cited by 165 publications

(222 citation statements)

References 26 publications

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“…Studies have shown that implants remain stable and thus serve as an absolute anchorage unit [1,23]. Therefore fixed nodes were used for force application.…”

Section: Discussionmentioning

confidence: 99%

“…High, Medium, Low pull Implants and from a conventional Molar hook and also to quantify the retraction and intrusion components of force during retraction with implants. Here a force of 150gm/side was applied [1,6,14,19,20].…”

Section: Construction Of Geometric Model [Table/fig-12]mentioning

confidence: 99%

“…It is characterized by dentoalveolar flaring of maxillary or both the maxillary and the mandibular anterior teeth with resultant protrusion of the lips and the convexity of the face. The present trend to treat protrusion is by extracting all the first premolars, followed by anterior tooth retraction to obtain the desired dental and soft-tissue profile changes [1].…”

Section: Introductionmentioning

confidence: 99%

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En-masse Retraction of the Maxillary Anterior Teeth by Applying Force from Four Different Levels – A Finite Element Study

Keluskar

Revankar³

2014

JCDR

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Objective: To find out if it is possible to control maxillary anterior teeth in sagittal and vertical plane during retraction by altering the vertical levels of force application in the posterior region, i.e. identifying the type of movement of the maxillary anterior teeth which occurs when force would be applied from four different levels i.e. High, Medium, and Low pull Implants and from a conventional Molar hook and also to quantify the retraction and intrusion components of force thus setting a guideline for the implant height placement. Materials and Methods:A Finite Element Model of maxillary dentition along with alveolar bone, brackets and wire was developed with defined material properties. The model was analysed to calculate the displacement when force was applied from different levels.Results: From all points of force application, anterior teeth tipped lingually in the sagittal plane, whereas in the vertical plane extrusion was seen when retracted from molar hook and intrusion was seen when retracted from implants. For every mm of apical displacement of implant, the retraction component of force reduces approximately by around 1% and intrusion component of force increases approximately by around 0.3%. Conclusion:Based on the results of this study we can reckon that by changing the position of implant in vertical plane one will have very little effect on the type of tooth movement. As the point of force application moves apically, type of tooth movement in the sagittal plane remained almost constant and in vertical plane intrusion is slightly increased.

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“…Studies have shown that implants remain stable and thus serve as an absolute anchorage unit [1,23]. Therefore fixed nodes were used for force application.…”

Section: Discussionmentioning

confidence: 99%

Section: Construction Of Geometric Model [Table/fig-12]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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En-masse Retraction of the Maxillary Anterior Teeth by Applying Force from Four Different Levels – A Finite Element Study

Keluskar

Revankar³

2014

JCDR

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“…3,4 In contrast, other studies have suggested distalization of the posterior anchorage unit, which may or may not be favorable. 5,6 Lastly, intrusion of the anterior segment often occurs during retraction with skeletal-based anchorage. 7 The inability to control anchorage during orthodontic space closure can compromise treatment results.…”

Section: Introductionmentioning

confidence: 99%

Initial forces experienced by the anterior and posterior teeth during dental-anchored or skeletal-anchored en masse retraction in vitro

Lee

Heo

El‐Bialy

et al. 2016

The Angle Orthodontist

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Objective: To investigate initial forces acting on teeth around the arch during en masse retraction using an in vitro Orthodontic SIMulator (OSIM). Materials and Methods: The OSIM was used to represent the full maxillary arch in a case wherein both first premolars had been extracted. Dental and skeletal anchorage to a posted archwire and skeletal anchorage to a 10-mm power arm were all simulated. A 0.019 3 0.025-inch stainless steel archwire was used in all cases, and 15-mm light nickel-titanium springs were activated to approximately 150 g on both sides of the arch. A sample size of n¼40 springs were tested for each of the three groups. Multivariate analysis of variance (a ¼ 0.05) was used to determine differences between treatment groups. Results: In the anterior segment, it was found that skeletal anchorage with power arms generated the largest retraction force (P , .001). The largest vertical forces on the unit were generated using skeletal anchorage, followed by skeletal anchorage with power arms, and finally dental anchorage. Power arms were found to generate larger intrusive forces on the lateral incisors and extrusive forces on the canines than on other groups. For the posterior anchorage unit, dental anchorage generated the largest protraction and palatal forces. Negligible forces were measured for both skeletal anchorage groups. Vertical forces on the posterior unit were minimal in all cases (,0.1 N). Conclusions: All retraction methods produced sufficient forces to retract the anterior teeth during en masse retraction. Skeletal anchorage reduced forces on the posterior teeth but introduced greater vertical forces on the anterior teeth. (Angle Orthod. 2017;87:549-555)

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“…Tipping can be prevented by applying lingual root torque to the archwire [15] or to increase archwire hook length to the level of centre of resistance [17]. The position of the mini implant should also be at the same level so that theforce passes through the centre of resistance and bodily movement occurs [18].…”

mentioning

confidence: 99%

Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study

Parashar¹,

Aileni

Rachala

et al. 2014

JCDR

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Treatment effects of mini-implants for en-masse retraction of anterior teeth in bialveolar dental protrusion patients: A randomized controlled trial

Cited by 165 publications

References 26 publications

En-masse Retraction of the Maxillary Anterior Teeth by Applying Force from Four Different Levels – A Finite Element Study

En-masse Retraction of the Maxillary Anterior Teeth by Applying Force from Four Different Levels – A Finite Element Study

Initial forces experienced by the anterior and posterior teeth during dental-anchored or skeletal-anchored en masse retraction in vitro

Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study

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