+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Localization of mandibular changes in patients with class II division 1 malocclusions treated with twin-block appliances: finite element scaling analysis



Localization of mandibular changes in patients with class II division 1 malocclusions treated with twin-block appliances: finite element scaling analysis



American Journal of Orthodontics and Dentofacial Orthopedics 119(4): 419-425



Thirty mandibular landmarks were digitized from cephalographs of 46 children (prepubertal, approximately 10 years old) and 53 adolescents (pubertal, approximately 13 years old) to determine mandibular morphological changes in patients with Class II Division 1 malocclusions treated with Twin-block appliances. Procrustes superimposition computed average geometries and an analysis of variance were performed on the cephalographs. Prepubertal pretreatment and approximately 13-month-posttreatment profiles and pubertal pretreatment and approximately 22-month-posttreatment profiles were statistically different (P <.002). In male prepubertal configurations, a color-coded finite element scaling analysis revealed a conspicuous area of positive allometry ( approximately 12%) in the condylar neck and negative allometry ( approximately 17%) at the apex of the coronoid process. For the female prepubertal configuration, local increases in size were discernible in the condylar neck ( approximately 3%) and in the apex of the coronoid process ( approximately 4%). Comparing male pubertal configurations, finite element scaling analysis revealed marked positive allometry ( approximately 27%) in the condylar neck and negative allometry ( approximately 16%) at the apex of the coronoid process. For the female pubertal configurations, local increases in size were noticeable at the condylar neck ( approximately 15%), with negative allometry ( approximately 9%) in the coronoid process. For shape change, all configurations were highly isotropic over the entire mandibular nodal mesh. Therefore, in growing patients treated for Class II Division 1 malocclusions with Twin-block appliances, condylar growth, coronoid process remodeling, and osteogenesis in corpus and dentoalveolar regions may reflect the correction of the underlying skeletal dysmorphology.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 046563176

Download citation: RISBibTeXText

PMID: 11298315

DOI: 10.1067/mod.2001.113265


Related references

Soft tissue changes in patients with Class II Division 1 malocclusions treated using Twin Block appliances: finite-element scaling analysis. European Journal of Orthodontics 25(3): 225-230, 2003

Dentoskeletal effects of Twin Block and Herbst appliances in patients with Class II division 1 mandibular retrognathy. European Journal of Orthodontics 36(2): 164-172, 2014

Morphospatial analysis of soft-tissue profile in patients with Class II Division 1 malocclusion treated using twin block appliances: geometric morphometrics. Orthodontics and Craniofacial Research 5(1): 38-50, 2002

Soft tissue effects of Twin Block and Herbst appliances in patients with Class II division 1 mandibular retrognathy. European Journal of Orthodontics 35(1): 71-81, 2013

Bimaxillary morphometry of patients with class II division 1 malocclusion treated with twin block appliances. Angle Orthodontist 72(5): 402-409, 2002

Comparison between Classic Twin-block and a Modified Clear Twin-block in Class II, Division 1 Malocclusions: A Randomized Clinical Trial. Journal of Contemporary Dental Practice 19(12): 1455-1462, 2018

Midfacial morphology of Koreans with class III malocclusions investigated with finite-element scaling analysis. Journal of Craniofacial Genetics and Developmental Biology 20(1): 10-18, 2000

The modified twin block appliance in the treatment of Class II division 2 malocclusions. Journal of Orthodontics 28(4): 271-280, 2001

Mandibular morphology in subjects with Class III malocclusions: Finite-element morphometry. Angle Orthodontist 68(5): 409-418, 1998

Dentofacial Effects of Fixed Functional Appliances with or without Mini Screw Anchorage in the Treatment of Class II Division I Malocclusion: A Finite Element Analysis. Turkish Journal of Orthodontics 31(1): 7, 2018

Skeletal and dental changes in Class II division 1 malocclusions treated with splint-type Herbst appliances. A systematic review. Angle Orthodontist 77(2): 376-381, 2007

Treatment of adolescent patients with class II division 1 malocclusion using Eruption guidance appliance: A comparative study with Twin-block and Activator-Headgear appliances. Swedish Dental Journal 40(1): 79-89, 2016

Comparison of mandibular morphology in Korean and European-American children with Class III malocclusions using finite-element morphometry. Journal of Orthodontics 27(2): 135-142, 2000

Comparison of temporomandibular joint changes in adolescent Class II devision 1 malocclusion patients with mandibular retrusion treated with Twin-block and Class II elastics. Zhonghua Kou Qiang Yi Xue Za Zhi 49(7): 394-398, 2014

A comparison of Twin Block, Andresen and removable appliances in the treatment of Class II Division 1 malocclusion. Functional Orthodontist 9(4): 26-31, 1992