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Correlation between the Rotation of the First Molars and the Severity of Class II Division 1 Malocclusion.

Lima BP, Pinzan-Vercelino CR, Dias LS, Bramante FS, Tavarez RR - ScientificWorldJournal (2015)

Bottom Line: The rotation was measured using parameters described by Henry, Friel, and Ricketts, referred to as indicators 1, 2, and 3, respectively.The rotational indicators were compared using one-way analysis of variance.In conclusion, there is a positive correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation in the maxillary first molars.

View Article: PubMed Central - PubMed

Affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.

ABSTRACT
This study aimed to evaluate the potential correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation of the maxillary first molars. Scanned images of 104 cast models were grouped according to the severity of Class II malocclusion as follows: Group 1, 1/4 Class II malocclusion; Group 2, 1/2 Class II malocclusion; Group 3, 3/4 Class II malocclusion; and Group 4, complete Class II malocclusion. The rotation was measured using parameters described by Henry, Friel, and Ricketts, referred to as indicators 1, 2, and 3, respectively. The correlation was evaluated using the Spearman's correlation coefficient. The rotational indicators were compared using one-way analysis of variance. For all statistical analyses used p < 0.05, a positive correlation was observed between the severity of Class II malocclusion and the mesiopalatal rotation of the maxillary first molar. This correlation was statistically significant for indicator 1 between Groups 1 and 3 and for indicator 2 between Groups 1 and 4, which include cases of extreme malocclusion. In conclusion, there is a positive correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation in the maxillary first molars.

No MeSH data available.


Related in: MedlinePlus

Determination of rotation of the first maxillary molar. (a) The defined points were initially marked on the scanned model. The three indicators were then calculated as follows: (b) indicator 1 (angle of Henry); (c) indicator 2 (angle of Friel); and (d) indicator 3 (line of Ricketts).
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fig1: Determination of rotation of the first maxillary molar. (a) The defined points were initially marked on the scanned model. The three indicators were then calculated as follows: (b) indicator 1 (angle of Henry); (c) indicator 2 (angle of Friel); and (d) indicator 3 (line of Ricketts).

Mentions: Six strategic points were marked initially on each model using an extra fine black brush (Figure 1(a)) to serve as a reference for the formation of the angles and lines, which were then used to evaluate the molar rotation. The various points, lines, and angles are described in Table 1.


Correlation between the Rotation of the First Molars and the Severity of Class II Division 1 Malocclusion.

Lima BP, Pinzan-Vercelino CR, Dias LS, Bramante FS, Tavarez RR - ScientificWorldJournal (2015)

Determination of rotation of the first maxillary molar. (a) The defined points were initially marked on the scanned model. The three indicators were then calculated as follows: (b) indicator 1 (angle of Henry); (c) indicator 2 (angle of Friel); and (d) indicator 3 (line of Ricketts).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4488541&req=5

fig1: Determination of rotation of the first maxillary molar. (a) The defined points were initially marked on the scanned model. The three indicators were then calculated as follows: (b) indicator 1 (angle of Henry); (c) indicator 2 (angle of Friel); and (d) indicator 3 (line of Ricketts).
Mentions: Six strategic points were marked initially on each model using an extra fine black brush (Figure 1(a)) to serve as a reference for the formation of the angles and lines, which were then used to evaluate the molar rotation. The various points, lines, and angles are described in Table 1.

Bottom Line: The rotation was measured using parameters described by Henry, Friel, and Ricketts, referred to as indicators 1, 2, and 3, respectively.The rotational indicators were compared using one-way analysis of variance.In conclusion, there is a positive correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation in the maxillary first molars.

View Article: PubMed Central - PubMed

Affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.

ABSTRACT
This study aimed to evaluate the potential correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation of the maxillary first molars. Scanned images of 104 cast models were grouped according to the severity of Class II malocclusion as follows: Group 1, 1/4 Class II malocclusion; Group 2, 1/2 Class II malocclusion; Group 3, 3/4 Class II malocclusion; and Group 4, complete Class II malocclusion. The rotation was measured using parameters described by Henry, Friel, and Ricketts, referred to as indicators 1, 2, and 3, respectively. The correlation was evaluated using the Spearman's correlation coefficient. The rotational indicators were compared using one-way analysis of variance. For all statistical analyses used p < 0.05, a positive correlation was observed between the severity of Class II malocclusion and the mesiopalatal rotation of the maxillary first molar. This correlation was statistically significant for indicator 1 between Groups 1 and 3 and for indicator 2 between Groups 1 and 4, which include cases of extreme malocclusion. In conclusion, there is a positive correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation in the maxillary first molars.

No MeSH data available.


Related in: MedlinePlus