Skeletal and Dentoalveolar changes concurrent to use of Twin Block appliance in Class II division I cases with a deficient mandible: A cephalometric study

BACKGROUND Facial prognathism may be because of prognathic maxilla, prognathic mandible or aggregate of both. Numerous studies performed to diagnose a single morphological feature commonly producing protrusive relationship, revealed that ‘a single morphological feature does not ordinarily produce a protrusive relationship. Existence of structural imbalance in one area also affects the nature of balance in other areas. A number of separate but inter-related cause and effect factors tend to augment each other in a cumulative and composite manner. Effect of marked discrepancy of an individual’s facial part could be cancelled or nullified by deviation of another part in opposite direction, ultimately resulting in good facial harmony. In this study by means of cephalometric roentgenography, the relation between Angle SNA and Angle NSAr was assessed in Vidharbhites, having normal occlusion, Class II division I and class III malocclusion. METHODS 40 individuals of normal occlusion, Class II division I and Class III Malocclusion, each between 16 and 25 years were analysed. These subjects were selected from patients reporting the outpatient department of Government Dental College, Nagpur. Statistically correlation between angles SNA and NSAr at level of significance 5 % was assessed. RESULTS After data collection a thorough observation & analysis was done and co-relation coefficient between SNA angle & NSAr (F--1.054 M--0.7981), also standard deviation of angular cephalometric measurement between males & females was found out in the population, leading to discussion on topic ‘Facial prognathism is due to maxillary prognathism, mandibular prognathism or combination of both’. In Females SNA was found to be 81 - 800 1.91310 and in males SNA was 82.1660 4. 380 respectively. CONCLUSIONS The results inferred that “Marked part of variation in Angle SNA can be explained by variation in Angle NSAr. KEY WORDS Angle SNA, Angle NSAr, Correlation

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Myofunctional Trainer versus Twin Block in Developing Class II Division I Malocclusion: A Randomized Comparative Clinical Trial

Dentistry Journal ◽

10.3390/dj8020044 ◽

2020 ◽

Vol 8 (2) ◽

pp. 44

Author(s):

Yasmine Elhamouly ◽

Azza A. El-Housseiny ◽

Hanan A. Ismail ◽

Laila M. El Habashy

Keyword(s):

Clinical Trial ◽

Class Ii ◽

Division I ◽

Healthy Children ◽

Mean Values ◽

Comparative Clinical Trial ◽

Twin Block ◽

The Mean ◽

Mandibular Retrusion

This study aimed to evaluate and compare the dentoalveolar effects of the myofunctional trainer T4KTM versus twin block in children with class II division I malocclusion. Two parallel arm randomized comparative clinical trial was conducted, including twenty healthy children, 9–12 years old, showing Angle’s class II division I malocclusion due to mandibular retrusion. Children were randomly assigned into two groups according to the appliance used; Group 1: T4k, and Group II: twin block. Follow-up was done every 4 weeks for 9 months. Postoperative cephalometric X ray, study casts and photographs were taken for measurements and comparison. T4K showed a statistically significant reduction in the overjet (−2.50 ± 1.00 mm) (p < 0.0001), and a significant increase in the lower arch perimeter (LAP) (1.19 ± 0.96 mm) (p = 0.01). The twin block showed a statistically significant reduction in the overjet (−3.75 ± 1.10 mm) (p < 0.0001), a significant reduction in the overbite (−16.22 ± 17.02 %) (p = 0.03), and a significant increase in the LAP (1.69 ± 0.70 mm) (p < 0.0001). The overjet showed a higher significant decrease in the twin block group than in T4K (p = 0.03). The mean values of the overbite were significantly decreased in twin block than in T4k (p < 0.0001). Both groups showed significant dentoalveolar improvements toward class I occlusion; however, the twin block showed significantly better results than T4K appliance.

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Unknown impact of an orthodontic functional appliance (Twin-block) on growth in Class II Division I malocclusions suggests caution

Journal of Evidence Based Dental Practice ◽

10.1067/med.2002.122926 ◽

2002 ◽

Vol 2 (1) ◽

pp. 30-31

Keyword(s):

Class Ii ◽

Division I ◽

Functional Appliance ◽

Twin Block

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Skeletal And DentoalveolarChanges Seen In Class II Div 1 MalOcclusion Cases Treated With Twin Block Appliance- A Cephalometric Study

IOSR Journal of Dental and Medical Sciences ◽

10.9790/0853-13180509 ◽

2014 ◽

Vol 13 (1) ◽

pp. 05-09 ◽

Cited By ~ 1

Author(s):

Dr. SuchitaTarvade (Daokar) ◽

◽

Dr. Sheetal Yamyar ◽

Dr. Charushila Choudhari ◽

Dr. Suhas Biday

Keyword(s):

Class Ii ◽

Twin Block ◽

Cephalometric Study

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A Cephalometric Investigation of Overjet Changes in Fifty Severe Class II Division I Malocclusions

British Journal of Orthodontics ◽

10.1179/bjo.16.1.31 ◽

1989 ◽

Vol 16 (1) ◽

pp. 31-37 ◽

Cited By ~ 12

Author(s):

R. R. Nashed ◽

I. R. Reynolds

Keyword(s):

Class Ii ◽

Division I ◽

Resultant Data ◽

End Of Treatment ◽

Craniofacial Features ◽

Cephalometric Study

A retrospective cephalometric study of 50 consecutively completed Class II Division I malocclusion cases was carried out in order to analyse the resultant data for craniofacial features which might act as predictors for successful overjet reduction. All the patients had clinically measured overjets of between 10 mm and 15 mm at the start of treatment. The sample was subsequently divided into two groups depending on whether or not the overjet had been reduced to 4 mm or less at the end of treatment. No firm predictors were found, but the most favourable results were achieved with the Begg appliance.

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