Comparison of the intrusion effects on the maxillary incisors between implant anchorage and J-hook headgear

Deguchi, Toru; Murakami, Takashi; Kuroda, Shingo; Yabuuchi, Toshinori; Kamioka, Hiroshi; Takano‐Yamamoto, Teruko

doi:10.1016/j.ajodo.2006.04.047

Cited by 78 publications

(71 citation statements)

References 16 publications

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“…[1][2][3][4] Typical orthodontic treatment includes extraction of the bimaxillary premolars and anterior tooth retraction, with maximum anchorage achieved through the placement of miniscrews, which enable the practitioners to achieve maximum anterior tooth retraction without undesirable movements of the posterior teeth. Despite the fact that the relationship between maximum anchorage and tooth displacement is well recognized, 5,6 retrospective upper airway analysis after retraction of the large incisors remains to be established. The upper airway plays an important role in respiration, swallowing, and pronunciation.…”

Section: Introductionmentioning

confidence: 99%

Effect of large incisor retraction on upper airway morphology in adult bimaxillary protrusion patients

Chen

Liu

Wang

et al. 2012

The Angle Orthodontist

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Objective: To evaluate, using multislice computed tomography (MSCT), the morphologic changes in the upper airway after large incisor retraction in adult bimaxillary protrusion patients. Materials and Methods: Thirty adult patients with bimaxillary protrusion had four first premolars extracted, and then miniscrews were placed to provide anchorage. A CT scan was performed before incisor retraction and again posttreatment. Three-dimensional (3D) reconstruction of the pre-(T1) and post-(T2) CT data was used to assess for morphological changes of the upper airway. A paired t-test was used to compare changes from T1 to T2. The relationship among the three variables (upper incisor retraction amount, upper airway size, and hyoid position) was analyzed by Pearson correlation coefficient. Results: The amounts of upper incisor retraction at the incisal edge and apex were 7.64 6 1.68 mm and 3.91 6 2.10 mm, respectively. The hyoid was retracted 2.96 6 0.54 mm and 9.87 6 2.92 mm, respectively, in the horizontal and vertical directions. No significant difference was observed in the mean cross-sectional area of the nasopharynx (P . .05) between T1 and T2, while significant differences between T1 and T2 were found in the mean cross-sectional areas of the palatopharynx, glossopharynx, and hypopharynx (P , .05); these mean cross-sectional areas were decreased by 21.02% 6 7.89%, 25.18% 6 13.51%, and 38.19% 6 5.51%, respectively. The largest change in the cross-sectional area is always noted in the hypopharynx. There was a significant correlation among the retraction distance of the upper incisor at its edge, the retraction distance of the hyoid in the horizontal direction, and the decrease of the hypopharynx. Conclusion: Large incisor retraction leads to narrowing of the upper airway in adult bimaxillary protrusion patients. (Angle Orthod. 2012;82:964-970.)

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Section: Introductionmentioning

confidence: 99%

Effect of large incisor retraction on upper airway morphology in adult bimaxillary protrusion patients

Chen

Liu

Wang

et al. 2012

The Angle Orthodontist

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“…Some studies have reported that external apical root resorption is associated with the type of loading force used. [16][17][18] An orthodontic force of approximately 350 g per side was applied with the MPA, with part of this force transmitted as intermittent force to the maxillary anterior teeth through oral appliances such as a lingual arch. Intermittent orthodontic force has been shown in some studies to have caused less root resorption than continuous force of the same magnitude.…”

Section: Discussionmentioning

confidence: 99%

“…16,17 On the other hand, in another study, force exerted by J-hook headgear (force applied continuously at night and then completely released during the day) caused greater root resorption than the force applied by tightening a ligature tied from a miniscrew to cause intrusion. 18 The authors of that study suggested that intermittent orthodontic forces such as those exerted by J-hook headgear might cause ''jiggling,'' which is a known risk factor for external apical root resorption. Recently, a study in rats suggested that jiggling might be a risk factor for root resorption and that it might induce root resorption through production of inflammatory cytokines during orthodontic tooth movement.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of maxillary central incisors on the noncleft and cleft sides in patients with unilateral cleft lip and palate—Part 1: Relationship between root length and orthodontic tooth movement

Maeda‐Iino

Marutani

Furukawa

et al. 2017

The Angle Orthodontist

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Objectives: To measure the root lengths of maxillary central incisors (U1) and evaluate the relationship among U1 root length, tooth movement, and type of treatment appliance in patients with unilateral cleft lip and palate over a long-term follow-up period. Materials and Methods: Occlusal radiographs of 30 patients with unilateral cleft lip and palate, acquired less than 6 months before secondary alveolar bone grafting (SBG, T1) and after edgewise treatment (T2), were measured for U1 root length (R1 and R2, root lengths at T1 and T2, respectively). Frontal and lateral cephalometric radiographs acquired at eruption of U1 (T0), T1, and T2 were evaluated to determine the inclination and position of U1. Results:The average values of R1 and R2 on the cleft side were significantly lower than those on the noncleft side. Frontal cephalometric analysis revealed that the horizontal distance of the root apex from the median vertical line at T0 on the cleft side was significantly smaller than that on the noncleft side and was correlated with short U1 root length on the cleft side. On the other hand, R1 in patients treated with maxillary protraction appliances between T0 and T1 was significantly shorter than that in patients without maxillary protraction appliances. However, none of the changes in cephalometric measurements were correlated with root length. Conclusions: In patients with unilateral cleft lip and palate, the short root length of cleft-adjacent central incisors might be associated with the horizontal position of the root apex. In addition, orthodontic treatment with a maxillary protraction appliance before secondary alveolar bone grafting might be associated with short U1 root length. (Angle Orthod. 2017;87:855-862.)

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“…Five angular and 9 linear measurements were made using Dolphin Imagining 11.0 Software (Dolphin Imaging and Management Solutions, Chatsworth, Calif) and ImageJ open-source image-analysis software (Version 1.46r, National Institutes of Health, Bethesda, Md) ( Figures 3 and 4). According to the power analysis at the 0.05 level and 80% power (based on a 0.56-mm standard deviation and a 0.6-mm detectable group difference regarding intrusion rates 9 ), the minimum sample size needed for each group was 14. Sixteen subjects were recruited for each group accounting for the possible dropouts.…”

Section: Methodsmentioning

confidence: 99%

“…[7][8][9] However in those studies either the root resorption was not evaluated, or the intrusion was not assessed from center of resistance or the observation time was not standardized in groups with the final records taken when the overbite is eliminated. [7][8][9] Thus this study was undertaken to evaluate the intrusion achieved via mini-implants and Connecticut intrusion arches in predesignated time duration with a standardized method of evaluating resorption using paralleling extension cone method.…”

mentioning

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...

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Comparison of the intrusion effects on the maxillary incisors between implant anchorage and J-hook headgear

Cited by 78 publications

References 16 publications

Effect of large incisor retraction on upper airway morphology in adult bimaxillary protrusion patients

Effect of large incisor retraction on upper airway morphology in adult bimaxillary protrusion patients

Evaluation of maxillary central incisors on the noncleft and cleft sides in patients with unilateral cleft lip and palate—Part 1: Relationship between root length and orthodontic tooth movement

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

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