Linked Life Data

11407768

Source:http://linkedlifedata.com/resource/pubmed/id/11407768

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2001-6-15
pubmed:abstractText
We measured the skeletal effects of Herbst appliance treatment in a retrospective sample of 25 boys (aged 10.7-14.5 years) and 25 girls (aged 10.7-14.3 years). Selection criteria were (1) a pretreatment full Class II molar relationship (ANB angle: average, 6.7 degrees; range, 2.5-10.5 degrees) and (2) a posttreatment full Class I or overcorrected Class I molar relationship within 6-8 months. A first t-test was used to evaluate variations between pre- and posttreatment cephalometric measures. Then, compared with the appropriate age- and sex-matched European norm, every pre- and posttreatment value was transformed into a z-score on the distribution of the norm value and a second t-test was performed. The second t-test was to study variations between pre- and posttreatment z-scores in order to neutralize the effect of natural growth. Posttreatment, the mandible showed a remarkable forward repositioning without opening of the gonial angle, particularly in males. Only ANB and Xi-CF-PTV angles were significantly different when the effect of normal growth was excluded. In males, ramus height and mandibular basal length were significantly increased when total variation was considered (ie, not excluding the effect of normal growth). In females, only the mandibular ramus height was significantly increased. In conclusion, even short-term Herbst therapy can be efficacious, with the most frequent effect being mandibular forward repositioning followed by mandibular ramus elongation. The statistical procedure used counteracts the effect of growth and sex on the results. Moreover, z-scores are adimensional measures with which any kind of parameter may be compared and scaled to each other in the perspective of a more reliable mutivariated interpretation of cephalometric variables.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
D
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0003-3219
pubmed:author
pubmed:issnType
Print
pubmed:volume
71
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
170-6
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Skeletal changes of Herbst appliance therapy investigated with more conventional cephalometrics and European norms.
pubmed:affiliation
Dental Department, University of Naples Federico II, Italy. manfredi@unina.it
pubmed:publicationType
Journal Article