Leveling the curve of Spee: Comparison between continuous archwire treatment and Invisalign system: A retrospective study

Rozzi, Matteo; Tiberti, Giulia; Mucedero, Manuela; Cozza, Paola

doi:10.1016/j.ajodo.2021.06.020

Cited by 8 publications

(4 citation statements)

References 35 publications

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“…Limited data are available regarding the efficacy of clear aligners in levelling the COS. However, it should be noted that clear aligners are generally less effective at achieving molar extrusion [ 12 ]. Clear aligners are frequently utilized to address moderate crowding without incorporating explicit intrusion or extrusion planning information in the modification of the COS.…”

Section: Discussionmentioning

confidence: 99%

“…Requests for aesthetic treatment in adults have led to orthodontists using clear aligner treatment (CAT) [ 11 ]. The predictability of mandibular COS levelling using aligner appliances has been explored by only a few authors, and the conclusions drawn from these studies remain controversial [ 12 , 13 ]. Some authors have reported the effectiveness of levelling through incisor intrusion with proclination control [ 12 ], while others have observed significant overestimation in mandibular COS levelling when checking the virtual set-up [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Curve of Spee modification in different vertical skeletal patterns after clear aligner therapy: a 3D set-up retrospective study

Ciavarella,

Fanelli,

Suriano

et al. 2024

Prog Orthod.

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Objective The purpose of the present study was to evaluate: (1) changes in the curve of Spee (COS) after clear aligner therapy and (2) whether such changes correlated with the patient’s skeletal patterns. Materials and methods Three-dimensional mandibular models of 106 patients (47 males and 59 females; mean age 22.3 SD ± 3.4 years) treated with clear aligners were retrospectively analysed. The perpendicular distance between the occlusal reference plane and the buccal cusp tip of each lateral tooth was measured. Five angular cephalometric measurements (PP-MP, PP-OP, OP-MP, AFH, and PFH) were performed and correlated with the T1–T0 difference in linear distances. The patients were divided into three groups according to facial divergence. Variance analysis with Tukey post hoc correction was performed to evaluate the differences among groups. Results The one-way ANOVA test showed a statistically significant difference for all analysed variables, except for the change in the distance of the second molar from the occlusal reference plane. Tukey’s HSD test showed the following differences: In normodivergents, the T1–T0 difference in the distance of the first molar from the occlusal plane was 1 mm greater than that observed in the hyperdivergent group (p < 0.05); in the normodivergent group, the T1–T0 difference in the distance of the second premolar from the occlusal plane was 1.23 mm greater than that observed in the hyperdivergent group (p < 0.05), while in the hypodivergent group, it was 1.08 mm greater than in the hyperdivergent group (p < 0.05); finally, in normodivergents, the T1–T0 difference in the distance of the first premolar from the occlusal plane was 0.97 mm greater than that observed in the hyperdivergent group (p < 0.05). Conclusion Treatment with aligners did not lead to a clinically significant change in COS depth. However, when dividing the sample into groups based on craniofacial divergence, COS depth change differed significantly between the three groups.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Curve of Spee modification in different vertical skeletal patterns after clear aligner therapy: a 3D set-up retrospective study

Ciavarella,

Fanelli,

Suriano

et al. 2024

Prog Orthod.

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“…Nonsurgical deep bite correction techniques include molar extrusion, incisor intrusion, or a combination of both [23]. Extrusion of posterior teeth might be viewed as a good option in low-angle growing patients.…”

Section: Discussionmentioning

confidence: 99%

Effects of different patterns of movement for correcting a deep curve of Spee with invisible orthodontic appliances on the anterior teeth: A finite element analysis

zhu,

Liu,

Wang

et al. 2023

Preprint

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Objective To evaluate the effects of five different patterns of mandibular molar movement and to define the most effective configuration to be implemented with clear aligners through finite element analysis. Methods A three-dimensional evaluation mandibular model with a deep overbite in the mandible was constructed based on cone beam computerized tomography (CBCT) data. The modelled components included mandibular dentition, mandibular periodontal ligaments, attachments, and aligners. Results Configuration A showed the highest distal displacement value, and configuration E showed the lowest value. For the central and lateral incisors, configuration E showed the highest PDL pressure. For canines, the difference between configurations C and D was not significant and the stress distribution differed among the five groups. Conclusion First, simultaneously, extruding the premolars during molar distalization could enhance the effectiveness of invisible aligners. Second, when expansion and extrusion are simultaneously performed during the distalization of teeth, attention must be given to the alveolar bone on the labial side of anterior teeth to prevent the occurrence of gingival recession, dehiscence, and fenestration.

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“…Following the distalization of the mandibular molars, there is slight labial tipping, intrusion, and protrusion of the mandibular incisors [ 9 , 17 ]. Traditional orthodontic treatments often require aligning and levelling the dental arch to level the curve of Spee before placing reverse-curve arch wires [ 18 ]. Many studies have reported that movement of mandibular anterior intrusion and molar extrusion has low efficiency [ 6 , 19 , 20 ], especially the hypodivergent face.…”

Section: Introductionmentioning

confidence: 99%

Effects of different patterns of movement for correcting a deep curve of Spee with clear aligners on the anterior teeth: a finite element analysis

Zhu,

Liu,

Wang

et al. 2024

BMC Oral Health

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Objective To analyse the anterior teeth effects of clear aligners on five different patterns of mandibular molar movement and to define the most effective configuration to be implemented with clear aligners through finite element analysis. Methods A three-dimensional mandibular model with a deep overbite in the mandible was constructed using cone beam computerized tomography (CBCT) data. The model included the mandibular dentition, mandibular periodontal ligaments, attachments, and aligners. Five models were created: (1) configuration A: second molar distalization (0.25 mm); (2) configuration B: second molar distalization (0.25 mm), first molar extrusion (0.15 mm); (3) configuration C: second molar distalization (0.25 mmm), first and second premolar extrusion(0.15 mm); (4) configuration D: second molar distalization (0.25 mm), first molar and first/second premolar extrusion(0.15 mm); and (5) configuration E: second molar distalization (0.25 mm), first molar and first/second premolar extrusion (0.15 mm), first molar and first/second premolar expansion (0.15 mm). Results In all configurations, the anterior teeth exhibited labial tipping and the mandibular central incisor of configuration E showed the highest labial tipping. Configuration E demonstrated a relatively minor impact on mandibular molars distalization compared with configuration A. Configuration A showed the highest distal displacement value, and configuration E produced the lowest displacement value. Configuration E caused the highest periodontal ligament (PDL) pressure of the central and lateral incisors. The differences in the canines between configurations C and D,were not significant, and the stress distribution differed among the five groups. Conclusions All patterns utilizing clear aligners facilitated mandibular molar distalization. Extruding the premolars and second molar distalization at the same time had little impact on second molar distalization; When expansion and extrusion were simultaneously performed during the distalization of mandibular molars, our prime consideration was the alveolar bone on the labial side of the anterior teeth to prevent the occurrence of gingival recession, dehiscence, and fenestration. Due to the lack of consideration for periodontal tissues in this study, clinical protocols should be designed based on the periodontal status of the mandibular anterior teeth.

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Leveling the curve of Spee: Comparison between continuous archwire treatment and Invisalign system: A retrospective study

Cited by 8 publications

References 35 publications

Curve of Spee modification in different vertical skeletal patterns after clear aligner therapy: a 3D set-up retrospective study

Curve of Spee modification in different vertical skeletal patterns after clear aligner therapy: a 3D set-up retrospective study

Effects of different patterns of movement for correcting a deep curve of Spee with invisible orthodontic appliances on the anterior teeth: A finite element analysis

Effects of different patterns of movement for correcting a deep curve of Spee with clear aligners on the anterior teeth: a finite element analysis

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