A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage

Kang, Ju-Man; Park, Jae Hyun; Bayome, Mohamed; Oh, Moonbee; Park, Chong Ook; Kook, Yoon‐Ah; Mo, Sung‐Seo

doi:10.4041/kjod.2016.46.5.290

Cited by 33 publications

(41 citation statements)

References 43 publications

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“…These findings were confirmed by Kang et al and Park et al who reported the displacement distribution level at the compact bone with the headgear lower than the bone-anchored pendulum. 22,34 This was in concurrence with the distal tipping movement that happened with Gerber application, and the bodily movement with the other appliance, and also Lee et al who reported that the high-stress concentration and displacement were obvious around anchorage points. 29 Higher displacement was reported at the PDL of the first molar when compared to other dentition.…”

Section: Discussionsupporting

confidence: 69%

“…Material properties of the components of the dental follicle encompassing the unerupted molar were similar to those of the PDL that had a lower density (►Table 1). 22,23 The contacts between the teeth were postulated to be frictionless. The thickness of the PDL and cortical bone was considered to be 0.2 and 3.4 mm, respectively.…”

Section: Model Components 3d Drawingmentioning

confidence: 99%

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A Comparative Three-Dimensional Finite Element Study of Two Space Regainers in the Mixed Dentition Stage

et al. 2020

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ObjectivesThis study aims to compare the stress distribution and displacement that resulted from the use of a Gerber space regainer and sagittal distalizer using three-dimensional finite element analysis. Materials and Methods Three-dimensional simulated models of the appliances were developed using a software. The forces applied by the two appliances were 3N (tipping) and 15N (bodily), respectively. Displacement and von Mises stress on the compact and cancellous bone, periodontal ligament (PDL), crowns of the mandibular first, second permanent molars, and deciduous canines were calculated. Stress distribution and displacement values were measured via linear static analysis. Results Gerber space regainer showed greater displacement than that produced by the sagittal distalizer at the first permanent molar. However, such displacement was less at the other tested points when compared with that delivered by sagittal distalizer. The stresses created by Gerber appliance were higher in the crown and PDL of the deciduous canine than the crown of the first permanent molar crown. Conclusions Gerber appliance generates more distal force and less stress concentration on the crown of the mandibular first permanent molar than that created by the sagittal distalizer. On the other hand, stress concentrations produced by Gerber space regainer are found to be more on the crown and PDL of the deciduous canine. Therefore, it can be concluded that the use of Gerber appliance needs more anchorage. AbstractKeywords ► mixed dentition ► finite element analysis ► stress distribution

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Section: Discussionsupporting

confidence: 69%

Section: Model Components 3d Drawingmentioning

confidence: 99%

A Comparative Three-Dimensional Finite Element Study of Two Space Regainers in the Mixed Dentition Stage

et al. 2020

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“…This is probably a consequence of the poor reliability of methods measuring rotation (1,27). The mesiobuccal rotation of the maxillary first molar has been stated previously, but only one study mentioned rotation of the first mandibular molar, and the rotation was opposite to the present finding during active treatment (18,28). Nonetheless, long-term follow-up revealed stability on molar rotations in their study (18).…”

Section: Mesiopalatal Rotation Of Upper First Molars Has Been Reportementioning

confidence: 61%

Dental arch effects after early and later timed cervical headgear treatment—a randomized controlled trial

Hannula

Pirilä-Parkkinen

Tolvanen

et al. 2019

European Journal of Orthodontics

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Summary Background Cervical headgear (CH) is a commonly used orthodontic appliance and its dentoalveolar changes are known. However, the effects related to gender and timing have gained less attention. Objectives To examine dimensions of dental arches among children with Class II occlusion without posterior mandibular rotation according to timing of Kloehn-type CH treatment. Trial design Prospective, randomized, parallel-group controlled trial. Methods Sixty-seven seven-year-old children with a Class II occlusion were included in the study. The children were randomized into two equal-size groups in 1:1 ratio by sealed-envelope randomization. The early group (EG, n = 33) was treated between T0 and T1 (26 months), right after eruption of the first maxillary molars. The late group (LG, n = 34) was treated between T1 and T2 (24 months). The children were treated with CH until normal Class I occlusion on first molars was achieved. Impressions for dental casts were taken from all participants at T0, T1, and T2. Blinding was applicable for outcome assessors. Changes in dental cast measurements were compared between the groups and genders using t-test, Mann-Whitney U-test, and repeated measures analysis of variance. Results Of the children, 56 completed the study. The maxillary arch length and the transversal changes between the upper canines and upper first molars were significantly increased in EG at T0−T1 (P < 0.001). At T2, the transversal dimension between the upper first molars was larger (P < 0.05), and in the lower arch the mandibular arch length (P < 0.05) and the transversal dimension between the lower first molars (P < 0.01) were increased in EG males compared to LG males. No harms were encountered. Conclusions The male gender benefits most from early timing of the CH treatment, showing larger dimensions at the end of the follow-up. The results clearly indicated a wider and longer upper dental arch and spontaneous expansion of the lower dental arch after treatment. Clinical Registration NCT02010346.

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“…Recently, Kang et al 27 reported distal tipping and extrusion of the first molar with headgear use in their finite element analysis. On the other hand, the palatal plate resulted in intrusion of the first molar accompanied by more distalization at the root level than at the crown level.…”

Section: Discussionmentioning

confidence: 99%

Comparison of treatment effects between the modified C-palatal plate and cervical pull headgear for total arch distalization in adults

Park

Sa'aed²,

Bayome³

et al. 2017

Korean J Orthod

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ObjectiveThe purpose of this study was to evaluate the dental and skeletal effects of the modified C-palatal plate (MCPP) for total arch distalization in adult patients with Class II malocclusion and compare the findings with those of cervical pull headgear.MethodsThe study sample consisted of the lateral cephalograms of 44 adult patients with Class II Division 1 malocclusion, including 22 who received treatment with MCPP (age, 24.7 ± 7.7 years) and 22 who received treatment with cervical pull headgear (age, 23.0 ± 7.7 years). Pre- (T1) and post-treatment (T2) cephalograms were analyzed for 24 linear and angular measurements. Multivariate analysis of variance was performed to evaluate the changes after treatment in each group and differences in treatment effects between the two groups.ResultsThe mean amount of distalization at the crown and root levels of the maxillary first molar and the amount of distal tipping was 4.2 mm, 3.5 mm, and 3.9° in the MCPP group, and 2.3 mm, 0.6 mm, and 8.6° in the headgear group, respectively. In addition, intrusion by 2.5 mm was observed in the MCPP group. In both groups, the distal movement of the upper lip and the increase in the nasolabial angle were statistically significant (p < 0.001). However, none of the skeletal and soft tissue variables exhibited significant differences between the two groups.ConclusionsThe results of this study suggest that MCPP is an effective treatment modality for total arch distalization in adults.

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A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage

Cited by 33 publications

References 43 publications

A Comparative Three-Dimensional Finite Element Study of Two Space Regainers in the Mixed Dentition Stage

A Comparative Three-Dimensional Finite Element Study of Two Space Regainers in the Mixed Dentition Stage

Dental arch effects after early and later timed cervical headgear treatment—a randomized controlled trial

Comparison of treatment effects between the modified C-palatal plate and cervical pull headgear for total arch distalization in adults

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