The Experts below are selected from a list of 70686 Experts worldwide ranked by ideXlab platform
Lorenzo Franchi - One of the best experts on this subject based on the ideXlab platform.
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development of a prediction model for short term success of functional treatment of class ii malocclusion
International Journal of Environmental Research and Public Health, 2020Co-Authors: Elisabetta Cretella Lombardo, Lorenzo Franchi, Giorgio Gastaldi, Veronica Giuntini, Roberta Lione, Paola Cozza, Chiara PavoniAbstract:(1) Background: The nature of the changes that contribute to Class II correction with functional appliances is still controversial. A broad variation in treatment responses has been reported. The purpose of this study was to find cephalometric predictors for individual patient responsiveness to twin-block treatment in patients with Class II Division 1 malocclusion; (2) Methods: The study was performed on a sample of 39 pubertal patients (21 females, 18 males) treated with the twin block appliance. Lateral cephalograms were available at the start of the treatment (T1) and at the end of functional therapy (T2). The outcome Variable was the T2-T1 change in the sagittal position of the soft tissue pogonion with respect to the vertical line perpendicular to the Frankfort plane and passing through point subnasale. The Predictive Variables were age, gender at T1, and all the cephalometric parameters measured T1. Forward stepwise linear regression with p value to enter 0.05 and p value to leave 0.10 was applied; (3) Results: The only significant Predictive Variable that was selected was the Co-Go-Me angle (p = 0.000); (4) Conclusions: A greater advancement of the soft tissue chin on the profile is expected with smaller pretreatment values of Co-Go-Me angle.
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prediction of class ii improvement after rapid maxillary expansion in early mixed dentition
Progress in Orthodontics, 2017Co-Authors: Alberto Caprioglio, Lorenzo Franchi, Chiara Bergamini, Nicolo Vercellini, Piero Antonio Zecca, Riccardo Nucera, Rosamaria FastucaAbstract:The aim of this study is to identify cephalometric pretreatment parameters for prediction of Class II improvement induced by rapid maxillary expansion. Lateral cephalograms of 30 patients (mean age 8.3 ± 1.6 years old) showing Class II molar relationship and undergone to rapid maxillary expansion on the upper deciduous molars were traced before treatment, and molar relation changes were evaluated on dental casts before and after treatment. Overall treatment time lasted 10.2 ± 2 months. Good responders (18 subjects, 10 females and 8 males) showed improvement of at least 2.50 mm, and bad responders (12 subjects, 7 females and 5 males) showed no improvement, improvement less than 2.50 mm, or worsening of molar relationship after treatment. Student’s t test was used to assess significance of differences between groups, and discriminant analysis allowed identification of Predictive pretreatment Variables. Articular angle, superior gonial angle, and mandibular dimensions (Co-Gn, S-Ar, Ar-Go, Go-Me) showed significant differences in the comparison between groups. Mandibular length Co-Gn and superior gonial angle were selected as significant Predictive Variable for discrimination. Patients with smaller mandibular length and more acute superior gonial angle are expected to have more chances to improve molar Class II after rapid maxillary expansion.
Gregory S. Antonarakis - One of the best experts on this subject based on the ideXlab platform.
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Predictive value of masseter muscle thickness and bite force on class ii functional appliance treatment a prospective controlled study
European Journal of Ophthalmology, 2015Co-Authors: Gregory S. Antonarakis, Stavros KiliaridisAbstract:Aim: To prospectively evaluate the functional capacity of the masticatory musculature as a Predictive Variable in determining functional appliance treatment outcomes in Class II/1 malocclusion children. Methods: Twenty Class II/1 malocclusion children (11.4±1.7 years) were treated with functional appliances during 1 year. Masseter muscle thickness and maximal molar bite force measurements, lateral cephalograms, and study casts were taken before and after treatment. Twenty age- and gender-matched untreated children were included as a control group. Regression analyses were used to identify correlations between pre-treatment muscle characteristics and treatment outcomes. Results: All treated patients showed dentoalveolar sagittal improvement. Maximal molar bite force and masseter muscle thickness decreased during the treatment period in the experimental group but increased in the control group. Children with lower pre-treatment maximal molar bite force showed more mesial movement of mandibular first molars, distal movement of maxillary first molars, and larger change in molar class during treatment. Children with thinner pre-treatment masseter muscles demonstrated more mandibular first molar mesialisation, mandibular incisor proclination, and opening of the gonial angle during treatment. Conclusions: The initial condition of the masticatory muscles may partly determine treatment outcomes. Children with thinner pre‐treatment masseter muscles or weaker bite force show greater dentoalveolar changes.
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bite force and its association with stability following class ii 1 functional appliance treatment
European Journal of Ophthalmology, 2013Co-Authors: Gregory S. Antonarakis, Heidrun Kjellberg, Stavros KiliaridisAbstract:The aims of this study were to investigate the value of pre-treatment maximal molar bite force as a Predictive Variable in determining post-treatment changes and stability following functional appliance treatment in Class II malocclusion children. Twenty-eight Class II malocclusion children having undergone functional appliance treatment were followed for at least 1 year post-treatment. Maximal molar bite force measurements, lateral cephalograms, and study casts were taken before treatment, after treatment, and after post-treatment follow-up. Relationships between pre-treatment maximal molar bite force and dental or cephalometric changes post-treatment were examined. Patients were divided into stable and unstable groups, based on dental sagittal changes (overjet and molar relationship), and differences between the two groups of patients determined. Post-treatment changes varied widely. Thirteen children showed dentoalveolar sagittal relapse, namely a shift in molars towards a Class II relationship and an increase in overjet, while 15 did not. The unstable group demonstrated a lower pre-treatment maximal molar bite force, as well as a more obtuse gonial angle, than the stable group. The gonial angle was found to be negatively correlated to maximal molar bite force and may thus be a cephalometric indicator partly reflecting the functional condition of the masticatory muscles. Children with a lower pre-treatment maximal molar bite force were more prone to dentoalveolar sagittal relapse following functional appliance treatment.
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masseter muscle thickness as a Predictive Variable in treatment outcome of the twin block appliance and masseteric thickness changes during treatment
Orthodontics & Craniofacial Research, 2010Co-Authors: Stavros Kiliaridis, C M Mills, Gregory S. AntonarakisAbstract:To cite this article: Kiliaridis S, Mills CM, Antonarakis GS: Masseter muscle thickness as a Predictive Variable in treatment outcome of the twin-block appliance and masseteric thickness changes during treatment Orthod Craniofac Res 2010;13:203–213 Structured Abstract Authors – Kiliaridis S, Mills CM, Antonarakis GS Objectives – To estimate the association of initial masseter muscle thickness with treatment outcomes using functional appliances and the effect of treatment on masseter muscle thickness. Material and Methods – Twenty-two children, aged 8–12, with skeletal and dental class II relationships and increased overjet were treated with twin-block appliances for 9–17 months, until a class I molar relationship and decreased overjet was achieved. Dental casts, lateral cephalograms, and ultrasonographic measurements of the masseter muscle were performed before and after treatment. Twenty-two children, aged 8–12, without immediate need for orthodontic treatment, served as controls. They were observed for 11–17 months, and ultrasonographic masseter muscle measurements were taken before and after the observation period. Results – Masseter muscles in treated children were thinner at the end of treatment, while untreated controls showed an increase in thickness. Treated children with thinner pre-treatment muscles showed greater mandibular incisor proclination, distalisation of maxillary molars, and posterior displacement of the cephalometric A point during treatment. Conclusion – Treatment of a dental class II relationship with functional appliances leads to mild atrophy of the masticatory muscles, possibly because of their decreased functional activity. The initial condition of the muscles may be associated with mandibular incisor proclination, and the position of maxillary first molars and A point.
Stavros Kiliaridis - One of the best experts on this subject based on the ideXlab platform.
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Predictive value of masseter muscle thickness and bite force on class ii functional appliance treatment a prospective controlled study
European Journal of Ophthalmology, 2015Co-Authors: Gregory S. Antonarakis, Stavros KiliaridisAbstract:Aim: To prospectively evaluate the functional capacity of the masticatory musculature as a Predictive Variable in determining functional appliance treatment outcomes in Class II/1 malocclusion children. Methods: Twenty Class II/1 malocclusion children (11.4±1.7 years) were treated with functional appliances during 1 year. Masseter muscle thickness and maximal molar bite force measurements, lateral cephalograms, and study casts were taken before and after treatment. Twenty age- and gender-matched untreated children were included as a control group. Regression analyses were used to identify correlations between pre-treatment muscle characteristics and treatment outcomes. Results: All treated patients showed dentoalveolar sagittal improvement. Maximal molar bite force and masseter muscle thickness decreased during the treatment period in the experimental group but increased in the control group. Children with lower pre-treatment maximal molar bite force showed more mesial movement of mandibular first molars, distal movement of maxillary first molars, and larger change in molar class during treatment. Children with thinner pre-treatment masseter muscles demonstrated more mandibular first molar mesialisation, mandibular incisor proclination, and opening of the gonial angle during treatment. Conclusions: The initial condition of the masticatory muscles may partly determine treatment outcomes. Children with thinner pre‐treatment masseter muscles or weaker bite force show greater dentoalveolar changes.
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bite force and its association with stability following class ii 1 functional appliance treatment
European Journal of Ophthalmology, 2013Co-Authors: Gregory S. Antonarakis, Heidrun Kjellberg, Stavros KiliaridisAbstract:The aims of this study were to investigate the value of pre-treatment maximal molar bite force as a Predictive Variable in determining post-treatment changes and stability following functional appliance treatment in Class II malocclusion children. Twenty-eight Class II malocclusion children having undergone functional appliance treatment were followed for at least 1 year post-treatment. Maximal molar bite force measurements, lateral cephalograms, and study casts were taken before treatment, after treatment, and after post-treatment follow-up. Relationships between pre-treatment maximal molar bite force and dental or cephalometric changes post-treatment were examined. Patients were divided into stable and unstable groups, based on dental sagittal changes (overjet and molar relationship), and differences between the two groups of patients determined. Post-treatment changes varied widely. Thirteen children showed dentoalveolar sagittal relapse, namely a shift in molars towards a Class II relationship and an increase in overjet, while 15 did not. The unstable group demonstrated a lower pre-treatment maximal molar bite force, as well as a more obtuse gonial angle, than the stable group. The gonial angle was found to be negatively correlated to maximal molar bite force and may thus be a cephalometric indicator partly reflecting the functional condition of the masticatory muscles. Children with a lower pre-treatment maximal molar bite force were more prone to dentoalveolar sagittal relapse following functional appliance treatment.
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masseter muscle thickness as a Predictive Variable in treatment outcome of the twin block appliance and masseteric thickness changes during treatment
Orthodontics & Craniofacial Research, 2010Co-Authors: Stavros Kiliaridis, C M Mills, Gregory S. AntonarakisAbstract:To cite this article: Kiliaridis S, Mills CM, Antonarakis GS: Masseter muscle thickness as a Predictive Variable in treatment outcome of the twin-block appliance and masseteric thickness changes during treatment Orthod Craniofac Res 2010;13:203–213 Structured Abstract Authors – Kiliaridis S, Mills CM, Antonarakis GS Objectives – To estimate the association of initial masseter muscle thickness with treatment outcomes using functional appliances and the effect of treatment on masseter muscle thickness. Material and Methods – Twenty-two children, aged 8–12, with skeletal and dental class II relationships and increased overjet were treated with twin-block appliances for 9–17 months, until a class I molar relationship and decreased overjet was achieved. Dental casts, lateral cephalograms, and ultrasonographic measurements of the masseter muscle were performed before and after treatment. Twenty-two children, aged 8–12, without immediate need for orthodontic treatment, served as controls. They were observed for 11–17 months, and ultrasonographic masseter muscle measurements were taken before and after the observation period. Results – Masseter muscles in treated children were thinner at the end of treatment, while untreated controls showed an increase in thickness. Treated children with thinner pre-treatment muscles showed greater mandibular incisor proclination, distalisation of maxillary molars, and posterior displacement of the cephalometric A point during treatment. Conclusion – Treatment of a dental class II relationship with functional appliances leads to mild atrophy of the masticatory muscles, possibly because of their decreased functional activity. The initial condition of the muscles may be associated with mandibular incisor proclination, and the position of maxillary first molars and A point.
Chiara Pavoni - One of the best experts on this subject based on the ideXlab platform.
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development of a prediction model for short term success of functional treatment of class ii malocclusion
International Journal of Environmental Research and Public Health, 2020Co-Authors: Elisabetta Cretella Lombardo, Lorenzo Franchi, Giorgio Gastaldi, Veronica Giuntini, Roberta Lione, Paola Cozza, Chiara PavoniAbstract:(1) Background: The nature of the changes that contribute to Class II correction with functional appliances is still controversial. A broad variation in treatment responses has been reported. The purpose of this study was to find cephalometric predictors for individual patient responsiveness to twin-block treatment in patients with Class II Division 1 malocclusion; (2) Methods: The study was performed on a sample of 39 pubertal patients (21 females, 18 males) treated with the twin block appliance. Lateral cephalograms were available at the start of the treatment (T1) and at the end of functional therapy (T2). The outcome Variable was the T2-T1 change in the sagittal position of the soft tissue pogonion with respect to the vertical line perpendicular to the Frankfort plane and passing through point subnasale. The Predictive Variables were age, gender at T1, and all the cephalometric parameters measured T1. Forward stepwise linear regression with p value to enter 0.05 and p value to leave 0.10 was applied; (3) Results: The only significant Predictive Variable that was selected was the Co-Go-Me angle (p = 0.000); (4) Conclusions: A greater advancement of the soft tissue chin on the profile is expected with smaller pretreatment values of Co-Go-Me angle.
Chingchiang Yeh - One of the best experts on this subject based on the ideXlab platform.
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going concern prediction using hybrid random forests and rough set approach
Information Sciences, 2014Co-Authors: Chingchiang Yeh, Derjang Chi, Yirong LinAbstract:Corporate going-concern opinions are not only useful in predicting bankruptcy but also provide some explanatory power in predicting bankruptcy resolution. The prediction of a firm's ability to remain a going concern is an important and challenging issue that has served as the impetus for many academic studies over the last few decades. Although intellectual capital (IC) is generally acknowledged as the key factor contributing to a corporation's ability to remain a going concern, it has not been considered in early prediction models. The objective of this study is to increase the accuracy of going-concern prediction by using a hybrid random forest (RF) and rough set theory (RST) approach, while adopting IC as a Predictive Variable. The results show that this proposed hybrid approach has the best classification rate and the lowest occurrence of Types I and II errors, and that IC is indeed valuable for going-concern prediction.
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a hybrid kmv model random forests and rough set theory approach for credit rating
Knowledge Based Systems, 2012Co-Authors: Chingchiang Yeh, Fengyi Lin, Chihyu HsuAbstract:In current credit ratings models, various accounting-based information are usually selected as prediction Variables, based on historical information rather than the market's assessment for future. In the study, we propose credit rating prediction model using market-based information as a Predictive Variable. In the proposed method, Moody's KMV (KMV) is employed as a tool to evaluate the market-based information of each corporation. To verify the proposed method, using the hybrid model, which combine random forests (RF) and rough set theory (RST) to extract useful information for credit rating. The results show that market-based information does provide valuable information in credit rating predictions. Moreover, the proposed approach provides better classification results and generates meaningful rules for credit ratings.