Root resorption in Class II malocclusion treatment with Class II elastics

Janson, Guilherme; Niederberger, Ana; Garib, Daniela Gamba; Caldas, Waleska

doi:10.1016/j.ajodo.2016.02.031

Cited by 13 publications

(8 citation statements)

References 34 publications

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“…Some scholars believed that the size of the cranial base angle affected the location of the maxilla and mandible, and then induced sagittal malocclusion (Lestrel et al, 2013;AL-Nimri et al, 2016;Zervas et al, 2016). Other scholars considered that one of the mechanisms of Angle's class II malocclusion was the increase of N-S-Ba angle, which caused the retrusion of the mandible and the relative protrusion of the maxillary complex (Brenda et al, 2001;Janson et al, 2016). However, some scholars confirmed that the N-S-Ba angle in Angle's class II malocclusion patients did not enlarge, and did not strongly associated with the position of the mandible.…”

Section: Discussionmentioning

confidence: 99%

Morphological Characteristics of the Cranial Base of Early Angle's Class II Division 1 Malocclusion in Permanent Teeth

Xuan

Liu

et al. 2017

Int. J. Morphol.

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Section: Discussionmentioning

confidence: 99%

Morphological Characteristics of the Cranial Base of Early Angle's Class II Division 1 Malocclusion in Permanent Teeth

Xuan

Liu

et al. 2017

Int. J. Morphol.

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“…Forces of 3 N were applied on the second molar brackets at −30°, −15°, 0°, 15° and 30° to the occlusal plane (Figure ). This amount of force was the same as that used in some previous studies, and these angles are commonly used when mesializing mandibular molars with interarch and intra‐arch elastomers. In the case of a force angulation of −30°, a lingually pre‐bent archwire was placed to prevent buccal tipping of the second molar.…”

Section: Methodsmentioning

confidence: 99%

“…Orthodontists depend on treatment mechanics that are designed to correct Class II malocclusions by correcting Class II dental relations through tooth movement within the alveolus by mesial movement of mandibular teeth. There are a number of orthodontic appliances and accessories for treating Class II malocclusions, and Class II elastics are among them …”

Section: Introductionmentioning

confidence: 99%

Biomechanical analysis for total mesialization of the mandibular dentition: A finite element study

Kawamura

Park

Kojima³

et al. 2019

Orthod Craniofacial Res

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Objectives To clarify the mechanics of tooth movement in mesialization of the whole mandibular dentition when changing the force angulation. Setting A finite element method was used to simulate long‐term movements of the whole mandibular dentition. Material and methods Tooth movement was simulated by accumulating the initial displacement, which was produced by elastic deformation of the periodontal ligament. Mesial forces of 3 N were applied to the second molar bracket at −30°, −15°, 0°, 15° and 30° to the occlusal plane. Results The whole dentition and occlusal plane were rotated depending on the direction of the force with respect to the centre of resistance (CR). At a force angulation of −30°, the line of action of the force passed near the CR, and the whole dentition translated without rotation of the occlusal plane. The second molar tipped buccally due to a clearance gap between the archwire and bracket slot. When increasing a force angulation from −30°, the line of action of the force passed above the CR, and thereby, the occlusal plane rotated clockwise. This rotation of the whole dentition induced tipping of the individual teeth. Buccal tipping of the molar due to an elastic deformation of the archwire was prevented by using a lingually pre‐bent archwire. Conclusions Careful selection of force angulation and biomechanics is essential to obtain proper tooth movement in total mesialization of the mandibular dentition.

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“…On the other hand, the length of these teeth increased in patients whose root development was not completed at the beginning of the fixed functional treatment. Janson et al [33] evaluated mandibular and maxillary incisor root resorption and they reported that non-extraction treatment of Class II malocclusion with Class II elastics associated with fixed appliances causes similar root resorption as treatment with extraoral headgear and fixed appliances. Apical root resorption was predominantly mild and similar in the two groups.…”

Section: Discussionmentioning

confidence: 99%

Volumetric measurements of mandibular incisor root resorption following Forsus FRD EZ2 and Bionator appliance treatment using cone-beam computed tomography: A preliminary study

Meriç

Zortuk

Karadede

2020

APOS

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Objectives: Root resorption is one of the frequently encountered problems in orthodontic treatments. The effects of functional appliances on root resorption have not been clearly demonstrated. The aim of this study was to compare volumetric root resorption of mandibular incisors after Bionator and Forsus appliance treatment using cone-beam computed tomography (CBCT). Materials and Methods: The study sample (n = 30) was selected from Class II div. 1 mandibular retrognathia patients treated with the Bionator and Forsus appliances. The first CBCT scans were taken before Bionator use and after 6 months. In the Forsus group, the first CBCT scans were taken before Forsus appliance use and after an overcorrected Class I relationship was obtained. The mean treatment time with the Forsus appliance was 5 ± 1.2 months. Mimics software was used for segmentation and volumetric measurements of mandibular incisor teeth root resorption. Results: In the Bionator group, statistically significant root volume loss was not found. In the Forsus group, the differences between before and after the treatment were not statistically significant for teeth 41, 31, and 32 (P > 0.05), whereas the difference was statistically significant for the lower right second incisor (P < 0.002). The percentage of volume loss (%) and root volume loss (mm3) was not statistically significant between groups. Conclusions: Following functional treatment with the Bionator and Forsus, statistically significant difference was not found between groups for mandibular incisor root resorption.

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Root resorption in Class II malocclusion treatment with Class II elastics

Cited by 13 publications

References 34 publications

Morphological Characteristics of the Cranial Base of Early Angle's Class II Division 1 Malocclusion in Permanent Teeth

Morphological Characteristics of the Cranial Base of Early Angle's Class II Division 1 Malocclusion in Permanent Teeth

Biomechanical analysis for total mesialization of the mandibular dentition: A finite element study

Volumetric measurements of mandibular incisor root resorption following Forsus FRD EZ2 and Bionator appliance treatment using cone-beam computed tomography: A preliminary study

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