Cephalometrically assessing the validity of superior, middle and inferior tragus points on ala-tragus line while establishing the occlusal plane in edentulous patient
Identifieur interne : 002619 ( Main/Exploration ); précédent : 002618; suivant : 002620Cephalometrically assessing the validity of superior, middle and inferior tragus points on ala-tragus line while establishing the occlusal plane in edentulous patient
Auteurs : Saurabh Chaturvedi [Inde] ; Ram Thombare [Inde]Source :
- The Journal of Advanced Prosthodontics [ 2005-7806 ] ; 2013.
Abstract
The purpose of this study was to decide the most appropriate point on tragus to be used as a reference point at time of marking ala tragus line while establishing occlusal plane.
The data was collected in two groups of subjects: 1) Dentulous 2) Edentulous group having sample size of 30 for each group with equal gender distribution (15 males, 15 females each). Downs analysis was used for base value. Lateral cephalographs were taken for all selected subjects. Three points were marked on tragus as Superior (S), Middle (M), and Inferior (I) and were joined with ala (A) of the nose to form ala-tragus lines. The angle formed by each line (SA plane, MA plane, IA plane) with Frankfort Horizontal (FH) plane was measured by using custom made device and modified protractor in all dentulous and edentulous subjects. Also, in dentulous subjects angle between Frankfort Horizontal plane and natural occlusal plane was measured. The measurements obtained were subjected to the following statistical tests; descriptive analysis, Student's unpaired t-test and Pearson's correlation coefficient.
The results demonstrated, the mean angle COO (cant of occlusal plane) as 9.76°, inferior point on tragus had given the mean angular value of IFH [Angle between IA plane (plane formed by joining inferior point-I on tragus and ala of nose- A) and FH plane) as 10.40° and 10.56° in dentulous and edentulous subjects respectively which was the closest value to the angle COO and was comparable with the values of angle COO value in Downs analysis. Angulations of ala-tragus line marked from inferior point with occlusal plane in dentulous subject had given the smallest value 2.46° which showed that this ala-tragus line was nearly parallel to occlusal plane.
The inferior point marked on tragus is the most appropriate point for marking ala-tragus line.
Url:
DOI: 10.4047/jap.2013.5.1.58
PubMed: 23508068
PubMed Central: 3597927
Affiliations:
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Downs analysis was used for base value. Lateral cephalographs were taken for all selected subjects. Three points were marked on tragus as Superior (S), Middle (M), and Inferior (I) and were joined with ala (A) of the nose to form ala-tragus lines. The angle formed by each line (SA plane, MA plane, IA plane) with Frankfort Horizontal (FH) plane was measured by using custom made device and modified protractor in all dentulous and edentulous subjects. Also, in dentulous subjects angle between Frankfort Horizontal plane and natural occlusal plane was measured. The measurements obtained were subjected to the following statistical tests; descriptive analysis, Student's unpaired t-test and Pearson's correlation coefficient.</p></sec><sec><title>RESULTS</title><p>The results demonstrated, the mean angle COO (cant of occlusal plane) as 9.76°, inferior point on tragus had given the mean angular value of IFH [Angle between IA plane (plane formed by joining inferior point-I on tragus and ala of nose- A) and FH plane) as 10.40° and 10.56° in dentulous and edentulous subjects respectively which was the closest value to the angle COO and was comparable with the values of angle COO value in Downs analysis. Angulations of ala-tragus line marked from inferior point with occlusal plane in dentulous subject had given the smallest value 2.46° which showed that this ala-tragus line was nearly parallel to occlusal plane.</p></sec><sec><title>CONCLUSION</title><p>The inferior point marked on tragus is the most appropriate point for marking ala-tragus line.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Monteith, Bd" uniqKey="Monteith B">BD Monteith</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Celebi, A" uniqKey="Celebi A">A Celebić</name></author><author><name sortKey="Valenti Peruzovi, M" uniqKey="Valenti Peruzovi M">M Valentić-Peruzović</name></author><author><name sortKey="Kraljevi, K" uniqKey="Kraljevi K">K Kraljević</name></author><author><name sortKey="Brki, H" uniqKey="Brki H">H Brkić</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Karkazis, Hc" 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