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Dentoskeletal and soft-tissue changes in growing class II malocclusion patients during nonextraction orthodontic treatment.
SADJ. 2006 Sep; 61(8):344-50.SADJ

Abstract

An investigation was conducted to determine the outcome of nonextraction edgewise orthodontic treatment of thirty-five caucasian patients with Class II molar relationships (13 division 1 and 22 division 2 cases). Twenty-three females and 12 males aged between 10 and 16 years old were treated using Class II intermaxillary elastics worn with 0.016" x 0.022" stainless steel archwires and without extra-oral traction. Thirty cephalometric landmarks were identified and digitized, and used to calculate 41 parameters. Space analyses were conducted on pretreatment study models. Most of the cases had between 0-4 mm space shortage in both maxillary and mandibular dentitions. Results of this study indicated that the mean SNA angle decreased by 1.580 degrees, and that this change was largely due to posterior movement of point A. The mean pre-treatment ANB value was 4.490 degrees which decreased to a mean posttreatment value of 2.810 degrees (p<0.05). No significant changes in the growth direction of the jaws were found, showing that the use of Class II intermaxillary elastics in this sample had no detrimental effect on this parameter (p<0.05). The SNB angle increased by a mean of 0.110 degrees, which can be attributed to anterior mandibular growth. The dentoalveolar changes included a mean overjet reduction of 3.816mm (mean posttreatment overjet was 2.2mm) and proclination of the lower incisors relative to the APo line and the mandibular plane, probably caused by the use of Class II intermaxillary elastics. The lower lip advanced relatively more than the upper lip, and this contributed to an improvement of the lip relationship. The amount of nose growth observed during the study was normal for this age group, and compared favourably with other data in the literature.

Authors+Show Affiliations

Division of Orthodontics, School of Oral Health Sciences, University of Stellenbosch.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

17165248

Citation

Combrink, F J., et al. "Dentoskeletal and Soft-tissue Changes in Growing Class II Malocclusion Patients During Nonextraction Orthodontic Treatment." SADJ : Journal of the South African Dental Association = Tydskrif Van Die Suid-Afrikaanse Tandheelkundige Vereniging, vol. 61, no. 8, 2006, pp. 344-50.
Combrink FJ, Harris AM, Steyn CL, et al. Dentoskeletal and soft-tissue changes in growing class II malocclusion patients during nonextraction orthodontic treatment. SADJ. 2006;61(8):344-50.
Combrink, F. J., Harris, A. M., Steyn, C. L., & Hudson, A. P. (2006). Dentoskeletal and soft-tissue changes in growing class II malocclusion patients during nonextraction orthodontic treatment. SADJ : Journal of the South African Dental Association = Tydskrif Van Die Suid-Afrikaanse Tandheelkundige Vereniging, 61(8), 344-50.
Combrink FJ, et al. Dentoskeletal and Soft-tissue Changes in Growing Class II Malocclusion Patients During Nonextraction Orthodontic Treatment. SADJ. 2006;61(8):344-50. PubMed PMID: 17165248.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dentoskeletal and soft-tissue changes in growing class II malocclusion patients during nonextraction orthodontic treatment. AU - Combrink,F J, AU - Harris,A M P, AU - Steyn,C L, AU - Hudson,A P G, PY - 2006/12/15/pubmed PY - 2007/4/24/medline PY - 2006/12/15/entrez SP - 344 EP - 50 JF - SADJ : journal of the South African Dental Association = tydskrif van die Suid-Afrikaanse Tandheelkundige Vereniging JO - SADJ VL - 61 IS - 8 N2 - An investigation was conducted to determine the outcome of nonextraction edgewise orthodontic treatment of thirty-five caucasian patients with Class II molar relationships (13 division 1 and 22 division 2 cases). Twenty-three females and 12 males aged between 10 and 16 years old were treated using Class II intermaxillary elastics worn with 0.016" x 0.022" stainless steel archwires and without extra-oral traction. Thirty cephalometric landmarks were identified and digitized, and used to calculate 41 parameters. Space analyses were conducted on pretreatment study models. Most of the cases had between 0-4 mm space shortage in both maxillary and mandibular dentitions. Results of this study indicated that the mean SNA angle decreased by 1.580 degrees, and that this change was largely due to posterior movement of point A. The mean pre-treatment ANB value was 4.490 degrees which decreased to a mean posttreatment value of 2.810 degrees (p<0.05). No significant changes in the growth direction of the jaws were found, showing that the use of Class II intermaxillary elastics in this sample had no detrimental effect on this parameter (p<0.05). The SNB angle increased by a mean of 0.110 degrees, which can be attributed to anterior mandibular growth. The dentoalveolar changes included a mean overjet reduction of 3.816mm (mean posttreatment overjet was 2.2mm) and proclination of the lower incisors relative to the APo line and the mandibular plane, probably caused by the use of Class II intermaxillary elastics. The lower lip advanced relatively more than the upper lip, and this contributed to an improvement of the lip relationship. The amount of nose growth observed during the study was normal for this age group, and compared favourably with other data in the literature. SN - 1029-4864 UR - https://www.unboundmedicine.com/medline/citation/17165248/Dentoskeletal_and_soft_tissue_changes_in_growing_class_II_malocclusion_patients_during_nonextraction_orthodontic_treatment_ L2 - https://antibodies.cancer.gov/detail/CPTC-SNAI1-1 DB - PRIME DP - Unbound Medicine ER -