Comparative evaluation of the depth of curve of Spee between individuals with normal dentition and individuals with occlusal wear using conventional and digital software analysis techniques: An in vivo study

Karani, Jyoti T; Idrisi, Arshad; Mistry, Saloni; Badwaik, Praveen; Pai, Ashutosh; Yadav, Sangeeta

doi:10.4103/jips.jips_168_17

Cited by 8 publications

(7 citation statements)

References 25 publications

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“…The sample considered in the present study did not require COS correction, as the deepest midpoint of the COS measured 2.2 mm before treatment. This observation is consistent with other authors who also considered a maximum of 2 mm as a normal COS measurement [ 22 , 30 , 31 ]. Moreover, in the present study, the deepest COS was found in the hypodivergent group.…”

Section: Discussionsupporting

confidence: 93%

“…The standard triangle language (STL) files were imported into dental CAD software (Meshmixer, Autodesk Inc.) to generate virtual models. An occlusal plane reference was established by drawing a line passing through the distobuccal cusp of the mandibular second molar on the right side and the cusp of canine anteriorly [ 22 – 24 ]. Using Ortho Analyzer (3Shape), the perpendicular distance between this plane and the buccal cusp tip of each lateral tooth was measured specifically on the right side of the curve (13).…”

Section: Methodsmentioning

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: Discussionsupporting

confidence: 93%

Section: Methodsmentioning

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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“…One possible explanation is that the COS may be pathologically altered in situations resulting from tipping of neighboring teeth when there is no sufficient restauration on the deciduous one. In contrast, a recent study from Karani et al [31] stated that the depth of the COS is maintained throughout life. However, orthodontists should be aware of individual occlusal adjustments with age, ending in a customized COS.…”

Section: Discussionmentioning

confidence: 85%

Curve of Spee and Second Mandibular Premolar Agenesis—Present Knowledge and Future Perspectives

et al. 2022

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Background: We investigated the relationship between the mandibular Curve of Spee (COS) and a persisting primary second mandibular molar (ppM2) due to an agenesis of the second mandibular premolar, using a digital software technique. Methods: Digital dental casts were obtained from 200 patients at the Department of Orthodontics in Innsbruck and Vienna, Austria. Patients (age-, gender-, and malocclusion-matched) were equally divided into two groups (n = 100) according to the existence of a ppM2. COS depth, overjet, overbite, and angle-classification were measured digitally using the OnyxCeph3TM (version 3.2.147) software. ANOVA and Kruskal–Wallis tests were used to analyze relationships. For statistical analyses, p < 0.05 was considered as statistically significant, p < 0.01 as highly significant. Results were visualized with box plots and bar charts. Results: The deepest COS was present in patients with a ppM2. Furthermore, a positive correlation was shown between COS depth and angle-class II, between COS depth and age, as well as between COS depth and overbite. No gender differences could be observed. Conclusions: In our study population the COS depth was dependent on whether there is a ppM2 due to an agenesis of a second mandibular premolar or not, as well as on the malocclusion in sagittal direction.

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“…Le curve di compenso creano un piano occlusale curvo che porta a occludere pochi denti alla volta, in modo da concentrare e ottimizzare la forza occlusale (Popowics, Herring 2006). La curva di Spee, essendo più legata ai movimenti di antero-posteriorità mandibolare, è più stabile della curva di Wilson (Karani et al 2018) perché rispetto ad essa la sua conformazione è maggiormente 'sganciata' dai cicli masticatòri; anche se sono state condotte pochissime ricerche per determinare la stabilità a lungo termine della curva di Spee, questa è in grado di modificarsi fisiologicamente coll'età (Kumar, Tamizharasi 2012), diminuendo mediante una riduzione della disclusione posteriore relativamente a una riduzione dell'overbite (Ahmed, Nazir, e Tabassum 2011).…”

Section: Piano Elicoidale E Inversione Delle Curve DI Compensounclassified

“…222). La gestione della curva di Spee è un fattore critico nella stabilità delle protesi totali (Farella 2002), e gioca un ruolo importante anche nel successo a medio e lungo termine delle protesi supportate da impianti (Karani et al 2018). La curva di Spee differisce tra i soggetti brachifacciali e quelli dolicofacciali; la forza del morso è in relazione diretta con la profondità della Spee: i brachifacciali con una leggera curvatura occlusale antero-posteriore manifestano forze più elevate (Sakaguchi et al 2012) (Fig.…”

Section: Piano Elicoidale E Inversione Delle Curve DI Compensounclassified

Origini, forma e (dis)funzioni dell’apparato masticatorio in Homo sapiens

Papini

2023

Studi E Saggi

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The anatomical-functional structure with which human beings are equipped today has its roots in our evolutionary history: knowing the latter helps us understand why our body looks like this and functions in this way. Every living being, including Homo sapiens, is the result of a progressive stratification of forms that have adapted to environmental pressures which have shaped their morphology from deep time until today. Our masticatory apparatus (evolutionarily very recent) began to develop with the advent of mammals around 250 million years ago, structuring itself with a unique morphology and function, closely linked to the upright posture typical of the Homo genus and to globular encephalisation, a characterizing peculiarity Homo sapiens.

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Comparative evaluation of the depth of curve of Spee between individuals with normal dentition and individuals with occlusal wear using conventional and digital software analysis techniques: An in vivo study

Cited by 8 publications

References 25 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

Curve of Spee and Second Mandibular Premolar Agenesis—Present Knowledge and Future Perspectives

Origini, forma e (dis)funzioni dell’apparato masticatorio in Homo sapiens

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