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Temporomandibular joint growth changes in hyperdivergent and hypodivergent Herbst subjects. A long-term roentgenographic cephalometric study.
Am J Orthod Dentofacial Orthop 2004; 126(2):153-61; quiz 254-5AJ

Abstract

The aim of this long-term study was to assess the amount and direction of glenoid fossa displacement, condylar growth, and "effective" temporomandibular joint (TMJ) changes (= the sum of glenoid fossa displacement, condylar growth, and condylar position changes in the fossa) in 3 vertical facial-type groups of Class II Division 1 malocclusions treated with the Herbst appliance. A comparison was made between 38 normodivergent (ML/NSL= 26.5 degrees -36.5 degrees), 17 hypodivergent (ML/NSL <or= 26 degrees), and 13 hyperdivergent (ML/NSL >or= 37 degrees) subjects. Lateral headfilms from before, after, and 5 years after treatment were scrutinized. Glenoid fossa displacement, condylar growth, and "effective" TMJ changes were analyzed. Treatment changes: in all facial-type groups, the glenoid fossa was displaced anteriorly and inferiorly. No differences existed between the 3 groups. Condylar growth and "effective" TMJ changes were directed posteriorly and superiorly. The changes in posterior direction were more apparent in the hyperdivergent group than in the normodivergent and hypodivergent groups. Posttreatment changes: in all facial-type groups, the fossa was displaced posteriorly. No differences existed between the 3 groups. Condylar growth and "effective" TMJ changes were directed more vertically compared with the treatment changes. The changes in posterior direction were more pronounced in the hyperdivergent group than in the other 2 groups. It was found that the amount and direction of TMJ growth changes (fossa displacement, condylar growth, and "effective" TMJ changes) were only temporarily affected favorably in the sagittal direction by Herbst treatment. Condylar growth and "effective" TMJ changes were directed more posteriorly in hyperdivergent than in hypodivergent Herbst subjects. This was true for both treatment and posttreatment period changes.

Authors+Show Affiliations

Department of Orthodontics, University of Giessen, Giessen, Germany. hans.pancherz@dentist.med.uni-giessen.deNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15316469

Citation

Pancherz, Hans, and Chrysoula Michailidou. "Temporomandibular Joint Growth Changes in Hyperdivergent and Hypodivergent Herbst Subjects. a Long-term Roentgenographic Cephalometric Study." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 126, no. 2, 2004, pp. 153-61; quiz 254-5.
Pancherz H, Michailidou C. Temporomandibular joint growth changes in hyperdivergent and hypodivergent Herbst subjects. A long-term roentgenographic cephalometric study. Am J Orthod Dentofacial Orthop. 2004;126(2):153-61; quiz 254-5.
Pancherz, H., & Michailidou, C. (2004). Temporomandibular joint growth changes in hyperdivergent and hypodivergent Herbst subjects. A long-term roentgenographic cephalometric study. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 126(2), pp. 153-61; quiz 254-5.
Pancherz H, Michailidou C. Temporomandibular Joint Growth Changes in Hyperdivergent and Hypodivergent Herbst Subjects. a Long-term Roentgenographic Cephalometric Study. Am J Orthod Dentofacial Orthop. 2004;126(2):153-61; quiz 254-5. PubMed PMID: 15316469.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Temporomandibular joint growth changes in hyperdivergent and hypodivergent Herbst subjects. A long-term roentgenographic cephalometric study. AU - Pancherz,Hans, AU - Michailidou,Chrysoula, PY - 2004/8/19/pubmed PY - 2004/8/31/medline PY - 2004/8/19/entrez SP - 153-61; quiz 254-5 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 126 IS - 2 N2 - The aim of this long-term study was to assess the amount and direction of glenoid fossa displacement, condylar growth, and "effective" temporomandibular joint (TMJ) changes (= the sum of glenoid fossa displacement, condylar growth, and condylar position changes in the fossa) in 3 vertical facial-type groups of Class II Division 1 malocclusions treated with the Herbst appliance. A comparison was made between 38 normodivergent (ML/NSL= 26.5 degrees -36.5 degrees), 17 hypodivergent (ML/NSL <or= 26 degrees), and 13 hyperdivergent (ML/NSL >or= 37 degrees) subjects. Lateral headfilms from before, after, and 5 years after treatment were scrutinized. Glenoid fossa displacement, condylar growth, and "effective" TMJ changes were analyzed. Treatment changes: in all facial-type groups, the glenoid fossa was displaced anteriorly and inferiorly. No differences existed between the 3 groups. Condylar growth and "effective" TMJ changes were directed posteriorly and superiorly. The changes in posterior direction were more apparent in the hyperdivergent group than in the normodivergent and hypodivergent groups. Posttreatment changes: in all facial-type groups, the fossa was displaced posteriorly. No differences existed between the 3 groups. Condylar growth and "effective" TMJ changes were directed more vertically compared with the treatment changes. The changes in posterior direction were more pronounced in the hyperdivergent group than in the other 2 groups. It was found that the amount and direction of TMJ growth changes (fossa displacement, condylar growth, and "effective" TMJ changes) were only temporarily affected favorably in the sagittal direction by Herbst treatment. Condylar growth and "effective" TMJ changes were directed more posteriorly in hyperdivergent than in hypodivergent Herbst subjects. This was true for both treatment and posttreatment period changes. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/15316469/Temporomandibular_joint_growth_changes_in_hyperdivergent_and_hypodivergent_Herbst_subjects__A_long_term_roentgenographic_cephalometric_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540604003300 DB - PRIME DP - Unbound Medicine ER -