Long-term stability of curve of Spee levelled with continuous archwires in subjects with different vertical patterns: a retrospective study

Rozzi, Matteo; Mucedero, Manuela; Pezzuto, Chiara; Lione, Roberta; Cozza, Paola

doi:10.1093/ejo/cjy065

Cited by 20 publications

(15 citation statements)

References 28 publications

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“…[ 3 ] Studies recently suggested utilizing pharmacologic therapy, biomaterial, and the chewing force in an attempt to provide another mechanism to enhance the stability of teeth after orthodontic treatment. [ 4 5 6 7 ]…”

Section: Introductionmentioning

confidence: 99%

Effects of Injectable platelet rich fibrin (i-PRF) on reduction of relapse after orthodontic tooth movement

Al-Fakhry¹,

Al–Sayagh²

2022

Journal of Orthodontic Science

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OBJECTIVES: The objective of this study is to determine whether submucosal local injection of i-PRF may affect orthodontic relapse by increasing bone density, which further leads to reducing orthodontic relapse. MATERIALS AND METHODS: Forty-five adult male albino rabbits were randomly divided into three groups: group I (control) with 15 rabbits injected with 200 μl of phosphate-buffered saline (PBS), group II with 15 rabbits injected with 200 μl of i-PRF, and group III of 15 rabbits inject with 400 μl of i-PRF. The lower incisors of rabbits moved distally by a modified orthodontic appliance for 2 weeks; then, the appliance was maintained in position to retain the gaining space for 2 weeks. During the retention period, each group was injected with the specific drug every 7 days. After the retention period, teeth were allowed to relapse by removal of the orthodontic appliance. The results were evaluated by measuring the amount of orthodontic relapse and bone density. The statistical analysis performed by ANOVA and Duncan ( P < 0.05 was considered significant). RESULTS: I-PRF groups showed a significant reduction in the amount of relapse at 10, 13, 17, and 20 days compared to the control group, indicated by the highest percentage of relapse for the control group at the end of the study (20 days); it was (90.4%) in compared to lowest percentage of relapse for i-PRF groups—they were 61.2% and 59.9%, respectively. CONCLUSION: Results indicated that i-PRF has the potential to enhance the stability of teeth after orthodontic tooth movement and could have the ability to reduce relapse, probably by increasing the alveolar bone density.

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Section: Introductionmentioning

confidence: 99%

Effects of Injectable platelet rich fibrin (i-PRF) on reduction of relapse after orthodontic tooth movement

Al-Fakhry¹,

Al–Sayagh²

2022

Journal of Orthodontic Science

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“…One of the dependable methods used for flatting of the COS—that recommended by Andrews 1972[ 15 ] is the extrusion of the infra erupted premolars to be in a flat plane with the incisors by the straight wire appliance,[ 38 ] this method was used to acquire a more stable orthodontic outcome. [ 1 39 40 ]…”

Section: Discussionmentioning

confidence: 99%

Does the flatting of the curve of spee affect the chewing force distribution in the mandible? (3D finite element study)

Hasan

Qassar

Alrawi

et al. 2021

Journal of Orthodontic Science

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OBJECTIVE: To search the effects of Curve of Spee (COS) flatting on the stresses and displacement on the different mandible landmarks and lower teeth during posterior teeth loading using three-dimensional (3D) finite element analysis. MATERIALS AND METHODS: Three-dimensional hemi mandibular model was created from real selected mandible. The lower teeth was aligned originally in a curved form with 2.4 mm depth at the cusp tip of the second premolar. Another replica with flat aligned teeth was formed to confirm the analysis by up righting premolars and molars. A load was applied at mesio-buccal cusp of the lower first molar on both models, and the resultant stresses and displacements on the mandibular landmarks and the lower teeth were tested. RESULTS: Von mises over the mandible was higher in flat than in curve model. The highest stress levels were detected at the Mesio-buccal cusp tip of first molar for flat and curved simulation (5053, 3304) Mpa respectively. Mesio-distally, the teeth displacement was higher in curve model than in flat one. The maximum distal displacement, in flat model, was seen in central and lateral incisors. While, in curve model, the maximum distal displacement was grasped within first and second premolars. CONCLUSIONS: Flatting the COS magnify the stresses over whole mandible and reduce lower teeth displacement mesio-distally. We speculated that the readjustment of the COS after orthodontic treatment could reduce the stress and displacements on the lower anterior teeth and decrease the lower anterior teeth crowding relapse.

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“…As an extremely strong muscleocclusion-joint triangular balance is too robust to be broken and reconstructed, it is hard for short-faced people to reestablish a new physiological homeostasis of the masticatory complex, indicating that occlusal treatment for these patients is awfully tough [29,30]. For example, it is generally rather difficult to increase the vertical height or open bite in occlusal therapy due to the powerful muscle-occlusion balance, and the curative effect is unstable with a high recurrence rate [31,32]. Moreover, these patients usually have a stout jaw and high bone density [21], which poses a challenge for successful tooth movement in orthodontic treatment, especially in cases of tooth extraction.…”

Section: Introductionmentioning

confidence: 99%

Can Botulinum Toxin-A Contribute to Reconstructing the Physiological Homeostasis of the Masticatory Complex in Short-Faced Patients during Occlusal Therapy? A Prospective Pilot Study

et al. 2022

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The physiological homeostasis of the masticatory complex in short-faced patients is too robust to be disintegrated and reconstructed due to the powerful masseter muscle. This study innovatively introduced the botulinum toxin-A (BTX-A) into the field of dental occlusal treatment, providing a novel and minimally invasive therapy perspective for the two major clinical problems in these patients (low treatment efficiency and high rates of complications). In total, 10 adult patients with skeletal low angle seeking occlusal treatment (age: 27.0 ± 6.1 years; 4 males and 6 females) were administered 30–50 U of BTX-A in each masseter muscle and evaluated before and 3 months after injection based on cone-beam computed tomography (CBCT). We found a significant reduction in the thickness of the masseter muscle (MMT) (p < 0.0001). With regards to occlusion, we found a significant increase in the height of the maxillary second molar (U7-PP) (p < 0.05) with significantly flattened occlusal curves (the curve of Spee [COS] (p < 0.01), and the curve of Wilson [COW] (p < 0.05)). Furthermore, the variations in the temporomandibular joint exhibited a significant reduction in the anterior joint space (AJS) (p < 0.05) and superior joint space (SJS) (p < 0.05). In addition, the correlation analysis of the masticatory complex provided the basis for the following multiple regression equation: MMT = 10.08–0.11 COW + 2.73 AJS. The findings from our pilot study indicate that BTX-A, as a new adjuvant treatment attempt of occlusal therapy for short-faced patients, can provide a more favorable muscular environment for subsequent occlusal therapy through the adjustment of the biting force and may contribute to the reconstruction of healthier homeostasis of the masticatory complex. However, further research is required to establish the reliability and validity of these findings.

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Long-term stability of curve of Spee levelled with continuous archwires in subjects with different vertical patterns: a retrospective study

Cited by 20 publications

References 28 publications

Effects of Injectable platelet rich fibrin (i-PRF) on reduction of relapse after orthodontic tooth movement

Effects of Injectable platelet rich fibrin (i-PRF) on reduction of relapse after orthodontic tooth movement

Does the flatting of the curve of spee affect the chewing force distribution in the mandible? (3D finite element study)

Can Botulinum Toxin-A Contribute to Reconstructing the Physiological Homeostasis of the Masticatory Complex in Short-Faced Patients during Occlusal Therapy? A Prospective Pilot Study

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