scholarly journals Morphofunctional Features in Angle Second Class Malocclusion on Dental Gypsum Models

2018 ◽  
Vol 55 (4) ◽  
pp. 686-690
Author(s):  
Cristian Romanec ◽  
Sorana Rosu ◽  
Georgiana Macovei ◽  
Monica Mihaela Scutariu ◽  
Bogdan Dragomir ◽  
...  
Keyword(s):  
Treatment Response ◽  
Class Ii ◽  
Post Treatment ◽  
Dental Arch ◽  
Significant Differentiation ◽  
Therapeutic Goals ◽  
Clinical Forms ◽  
Dental Arcade ◽  
Maxillary Arch

The large diversity of clinical forms in Angle second class malocclusion explains the interest of researchers and clinicians in identifying changes in the dental arch in subdivisions II/1 and II/2. The purpose of the study is to identify the characteristics of the dental alveolar arch in order to determine the differences between class II/l and II/2 malocclusions. The study was conducted on dental gypsum models of 62 orthodontic untreated patients diagnosed with class II/1 Angle malocclusion, respectively class II/2. The results obtained by us reveals a statistically significant differentiation in the dental arcade, a narrowed maxillary arch at the molar level and elongated at premolar and molar level, in subdivision II/l. Our data are consistent with the results of literature. The knowledge of dental arch features serves to develop a correct and complete diagnosis and also to reach the therapeutic goals and to evaluate post-treatment response in short, medium and long term.

Class II treatment in early mixed dentition with the eruption guidance appliance: effects and long-term stability

2019 ◽  
Vol 42 (2) ◽  
pp. 151-156 ◽  
Author(s):  
Katri Keski-Nisula ◽  
Leo Keski-Nisula ◽  
Juha Varrela
Keyword(s):  
Treatment Group ◽  
Class Ii ◽  
Post Treatment ◽  
Mixed Dentition ◽  
Term Stability ◽  
Long Term Stability ◽  
Class Ii Treatment ◽  
Significant Correction ◽  
The Mean

Summary Objectives Our aim was to analyse dentoskeletal effects and long-term stability of Class II treatment carried out with an eruption guidance appliance (EGA) in early mixed dentition. Materials and methods Sixty-five Class II patients (38 females and 27 males), treated with an EGA in early mixed dentition, were compared with 58 children (26 females and 32 males) with untreated Class II malocclusion. The mean age in the treatment group at the start (T1) and end of treatment (T2) was 5.4 years (±0.4) and 8.5 years (±0.9), respectively, and at the final examination in the early permanent dentition (T3) 16.7 years (±0.4). In the control group, the mean age at T1 and T2 were 5.1 years (±0.5) and 8.4 years (±0.5), respectively. The independent and dependent sample t-tests, Chi-square test, and Fisher’s test were used in the statistical evaluation. Results In the treatment group, the frequency of Class II decreased from 100 to 14% during the treatment (T1–T2) and a significant correction took place in all occlusal variables. At T2, the treatment and control groups showed statistically significant differences (P < 0.05) in all occlusal variables. In the treated children, mandibular length increased 5 mm more (P < 0.001) from T1 to T2 compared to the control children, and the ANB angle became significantly smaller (P = 0.006). During the post-treatment period (T2–T3), the frequency of Class II in the treatment group decreased from 14 to 2% (P < 0.05), overbite increased from 2.2 to 3.1 mm (P < 0.05), and lower crowding increased from 2to 14% (P < 0.05). Post-treatment changes in overjet and upper crowding were not statistically significant. At T3, the mean values of the SNA, SNB, and ANB angles were 83.0° (SD 3.9°), 81.3° (SD 3.8°), and 2.4° (SD 1.5°), respectively. Conclusions A clinically significant correction of the molar relationship, overjet, overbite, incisor alignment, and growth enhancement of the mandible were observed after treatment in early mixed dentition. The treatment results remained largely stable in the early permanent dentition. However, an increase was observed in overbite and lower crowding. None of the children treated in early mixed dentition needed a second treatment phase.

scholarly journals Asymmetric dental arch treatment with Forsus fatigue appliances: Long-term results

2019 ◽  
Vol 89 (5) ◽  
pp. 688-696 ◽  
Author(s):  
Mehmet Akın ◽  
Emire Aybuke Erdur ◽  
Onur Öztürk
Keyword(s):  
Repeated Measures ◽  
Class Ii ◽  
Long Term Results ◽  
Dental Arch ◽  
Retention Period ◽  
Repeated Measures Analysis ◽  
Dental Models ◽  
Digital Dental Models

ABSTRACT Objectives: To investigate the treatment efficacy and follow-up stability of the asymmetric Forsus appliance by evaluating longitudinal changes in dental arch asymmetry on digital dental models from 21 patients. Materials and Methods: Maxillary and mandibular reference lines were used for measurements of intra-arch asymmetry at pretreatment (T1), posttreatment (T2), and 4.2 years after treatment (T3). Maxillary and mandibular measurements were performed relative to the dental midline and anterior reference line on digital dental models. To determine the amount of asymmetry between the Class I and Class II sides of a given arch, all maxillary and mandibular parameters were measured on each side of the model separately. Repeated-measures analysis of variance/paired sample t-tests were performed to evaluate dental arch asymmetries at the P < .05 level. Results: The alveolar transverse dimensions of the posterior segment of both arches were increased during treatment (P < .05) and remained stable during the retention period. Class II subdivision malocclusion was caused by distal positioning of the mandibular canine, premolars, and first molar on the Class II side (P < .05). Asymmetry was resolved by treatment with asymmetric Forsus appliances. The resolved asymmetry remained stable over the long term. There were no significant differences between T2 and T3 (P > .05). Conclusions: The asymmetric Forsus appliance can be used to treat dental arch asymmetry in patients with Class II subdivision malocclusions.

Occlusal Changes from Primary to Permanent Dentitions

1986 ◽  
Vol 13 (4) ◽  
pp. 187-193 ◽  
Author(s):  
T. D. Foster ◽  
M. C. Grundy
Keyword(s):  
Longitudinal Study ◽  
Class Ii ◽  
Permanent Dentition ◽  
Primary Dentition ◽  
Dental Arch ◽  
Mandibular Arch ◽  
The Individual ◽  
Simple Count ◽  
Maxillary Arch

A longitudinal study was undertaken to assess the persistance of occlusal features of the primary dentition at five years into the permanent dentition at 12 years. It was found that although there was a broad measure of predictability there was variation in detail which made forecasting unreliable in the individual patient. Generally speaking, incisal overjet and overbite changed very little between the two dentitions, but those changes which occurred were in both directions, and the direction of change could not be predicted. The sagittal relationships of the dental arch were also relatively stable, but where change occurred it tended to be in a Class II direction, with the mandibular arch becoming more retroposed in relation to the maxillary arch. The prediction of crowding of the permanent dentition from a simple count of spaces in the primary dentition, while generally reliable, was not accurate in every individual patient.

scholarly journals Long-term (≥15 years) post-treatment changes and outcome quality after Class II:1 treatment in comparison to untreated Class I controls

2017 ◽  
Vol 40 (2) ◽  
pp. 206-213 ◽  
Author(s):  
Niko C Bock ◽  
Mitra Saffar ◽  
Helge Hudel ◽  
Marjut Evälahti ◽  
Kaisa Heikinheimo ◽  
...  
Keyword(s):  
Class Ii ◽  
Post Treatment ◽  
Class I ◽  
Outcome Quality ◽  
Treatment Changes

Long-term Effects of the Herbst Appliance on the Dental Arches and Arch Relationships: A Biometric Study

1995 ◽  
Vol 22 (2) ◽  
pp. 123-134 ◽  
Author(s):  
Ken Hansen ◽  
Pannamas Iemamnueisuk ◽  
Hans Pancherz
Keyword(s):  
Growth Period ◽  
Post Treatment ◽  
Dental Arch ◽  
Long Term Effects ◽  
Herbst Appliance ◽  
Mandibular Arch ◽  
Division 1 ◽  
The Mean ◽  
Upper Molar

The purpose of this study was to evaluate biometrically the treatment and post-treatment effects of the Herbst appliance on the dental arches and arch relationships. The sample consisted of 53 Class II, division 1 malocclusion patients (33 boys and 20 girls) treated with the Herbst appliance. The mean age of the patients before treatment was 12·5 years (SD = 1·2 years). Dental casts were analysed before treatment, after treatment, 6 months post-treatment and at the end of the growth period (5–10 years post-treatment). The following variables were assessed: sagittal molar and canine relationships, overjet, overbite, maxillary and mandibular arch perimeters, and inter-molar and inter-canine dental arch widths. During treatment, the overjet, overbite, and sagittal molar relationship were overcorrected in most of the cases, while the sagittal canine relationship was normalized. The maxillary and mandibular arch perimeters increased during treatment, as did dental arch widths (moral and canine). In the long-term (mean = 6·7 years after treatment), Herbst appliance treatment resulted in a normal or over-corrected sagittal molar relationship in 79 per cent and a normal canine relationship in 68 per cent of the cases. Eighty-three per cent of the subjects has an overjet of 4·5 mm or less. In the long-term, the arch perimeters seemed to follow a normal dental development pattern. The increase of the upper molar and canine dental arch widths during treatment remained virtually stable whilst the lower intermolar arch widths seemed unaffected by treatment.

Long-term Evaluation of Treated Class II Division 1 Malocclusions Utilizing the PAR Index

1995 ◽  
Vol 22 (2) ◽  
pp. 171-178 ◽  
Author(s):  
O. D. Otuyemi ◽  
S. P. Jones
Keyword(s):  
Class Ii ◽  
Post Treatment ◽  
Anterior Crowding ◽  
Treatment Standard ◽  
Par Index ◽  
Division 1 ◽  
Term Evaluation ◽  
High Treatment ◽  
Class Ii Division 1

The PAR Index was used to evaluate treatment and long-term post-retention results obtained from 50 Class II division 1 malocclusions. Dental casts were used to record the occlusions pre- and post-treatment as well as 1 and 10 years post-retention. The results suggested a high treatment standard, as indicated by mean percentage PAR score reduction. However, maintenance of post-treatment results 1 and 10 years post-retention was only achieved in 60 and 38 per cent of cases, respectively. The major factor involved in this deterioration appeared to be late lower anterior crowding.

scholarly journals Three-dimensional dental arch changes of patients submitted to orthodontic-surgical treatment for correction of Class II malocclusion

2014 ◽  
Vol 19 (4) ◽  
pp. 71-79 ◽  
Author(s):  
Adriano Porto Peixoto ◽  
Ary dos Santos Pinto ◽  
Daniela Gamba Garib ◽  
João Roberto Gonçalves
Keyword(s):  
Surgical Treatment ◽  
Three Dimensional ◽  
Class Ii ◽  
Dental Arch ◽  
Class Ii Malocclusion ◽  
Dimensional Changes ◽  
Vertical Changes ◽  
Lower Arch ◽  
Maxillary Arch

INTRODUCTION: This study assessed the three-dimensional changes in the dental arch of patients submitted to orthodontic-surgical treatment for correction of Class II malocclusions at three different periods. METHODS: Landmarks previously identified on upper and lower dental casts were digitized on a three-dimensional digitizer MicroScribe-3DX and stored in Excel worksheets in order to assess the width, length and depth of patient's dental arches. RESULTS: During orthodontic preparation, the maxillary and mandibular transverse dimensions measured at the premolar regions were increased and maintained throughout the follow-up period. Intercanine width was increased only in the upper arch during orthodontic preparation. Maxillary arch length was reduced during orthodontic finalization, only. Upper and lower arch depths were stable in the study periods. Differences between centroid and gingival changes suggested that upper and lower arch premolars buccaly proclined during the pre-surgical period. CONCLUSIONS: Maxillary and mandibular dental arches presented transverse expansion at premolar regions during preoperative orthodontic preparation, with a tendency towards buccal tipping. The transverse dimensions were not altered after surgery. No sagittal or vertical changes were observed during the follow-up periods.

A study on Arch Widths of Bangladeshi Adult Subjects with Class II -2 malocclusion compared to Normal Occlusion

2019 ◽  
pp. 27-30
Author(s):  
Md Masud Rana ◽  
Fazlay Rabbani ◽  
Deloar Hosen
Keyword(s):  
Comparative Study ◽  
Effective Treatment ◽  
Treatment Strategy ◽  
Class Ii ◽  
Dental Arch ◽  
Cross Sectional ◽  
Normal Occlusion ◽  
Dentofacial Orthopedics ◽  
Maxillary Arch

Aim: To evaluate the transverse discrepancy in Class II div 2 malocclusion and normal occlusion. Also to test the hypothesis that models with class II div 2 malocclusions may have mean maxillary arch widths significantly smaller than those with normal occlusion. Thus the proposed study will generate interest among the orthodontists for further study over the transverse discrepancy of our patients and guide them to establish effective treatment strategy and their management. Materials and Methods : Cross sectional comparative study was carried out Department of Orthodontics & Dentofacial Orthopedics of Dhaka Dental College & Hospital, Dhaka with 100 sample was included in this study. Results: Maxillary intercanine, interfirst premolar and interfirst molar widths between normal occlusions and class II div 2 malocclusions were statistically significant.Maxillary measurements of class II div 2 malocclusion were smaller than normal occlusion. Mandibular intercanine, interfirst premolar and interfirst molar widths between Class II div 2 malocclusion and normal occlusions were statistically significant. Conclusion: This study helps in determining possible differences in the dental arch widths of Bangladeshi people in Class II-2 adults compared to adults with normal occlusion may be an important aid in further understanding of dentoalveolar characteristics of these conditions, as well as improving their management. Ban J Orthod & Dentofac Orthop, April 2017; Vol-7 (1-2), P.27-30

scholarly journals A Study on Arch Length Among Dentoalveolar Class I, Class II and Class III Malocclusion of Bangladeshi Population

2012 ◽  
Vol 9 (1) ◽  
pp. 1-3
Author(s):  
Ashis Kumar Biswas ◽  
Gazi Shamim Hassan ◽  
Nasreen Akhter ◽  
Ranjit Ghosh ◽  
Mohammad Rakibul Islam Babu
Keyword(s):  
Class Ii ◽  
Permanent Dentition ◽  
Dental Arch ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Significant Difference ◽  
Class 1 ◽  
Bangladeshi Population ◽  
Lower Arch ◽  
Maxillary Arch

Objectives : To study the variations in arch length among different classes of dento-alveolar malocclusion in the permanent dentition. Materials and Methods: Both male and female Bangladeshi subjects with permanent dentition who attended during 1st July 2007 to 1st January 2011 to the Department of Orthodontics, BSMMU for treatment were included in this study. Dental arch length were measured from dental casts of the permanent dentition of 96 Bangladeshi subjects of which 48 male, 48 female, 24 class 1, 24 class 2 div. I, 24 class 2 div. II, 24 class III. Arch length was measured by adapting a length of brass wire (diameter 0.5 mm) on the maxillary and mandibular arches. Comparison of arch length was done among different malocclusion classes. Results: In these study we found maxillary arch length was largest in class II div. 1 malocclusion. Mandibular arch length was highest in class III and lowest in class II div. 1 malocclusion. Least significant difference (LSD) is used to compare two of the four group. P<0.05 was set as the level of significance. Conclusions : Class III malocclusion has large lower arch and short upper arch. In Class II division 1, arch length is larger in upper than lower arch and Class II division 2 show the shortest maxillary arch length.DOI: http://dx.doi.org/10.3329/cdcj.v9i1.11827 City Dental College Journal Vol.9(1) 2012 1-3

Continuous Positive Airway Pressure (CPAP) Therapy for the Treatment of Hypernasality: A Single Case Study

2014 ◽  
Vol 24 (2) ◽  
pp. 48-58 ◽  
Author(s):  
Lakshmi Kollara ◽  
Graham Schenck ◽  
Jamie Perry
Keyword(s):  
Continuous Positive Airway Pressure ◽  
Airway Pressure ◽  
Positive Airway Pressure ◽  
Single Case ◽  
Treatment Method ◽  
Post Treatment ◽  
Subjective Perception ◽  
Cpap Therapy ◽  
Long Term Follow Up

Studies have investigated the applications of Continuous Positive Airway Pressure (CPAP) therapy in the treatment of hypernasality due to velopharyngeal dysfunction (VPD; Cahill et al., 2004; Kuehn, 1991; Kuehn, Moon, & Folkins, 1993; Kuehn et al., 2002). The purpose of this study was to examine the effectiveness of CPAP therapy to reduce hypernasality in a female subject, post-traumatic brain injury (TBI) and pharyngeal flap, who presented with signs of VPD including persistent hypernasality. Improvements in mean velopharyngeal orifice size, subjective perception of hypernasality, and overall intelligibility were observed from the baseline to 8-week post-treatment assessment intervals. Additional long-term assessments completed at 2, 3, and 4 months post-treatment indicated decreases in immediate post-treatment improvements. Results from the present study suggest that CPAP is a safe, non-invasive, and relatively conservative treatment method for reduction of hypernasality in selected patients with TBI. More stringent long-term follow up may indicate the need for repeated CPAP treatment to maintain results.

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