Korean J Orthod.  2017 May;47(3):151-157. 10.4041/kjod.2017.47.3.151.

Comparison of masticatory efficiency according to Angle's classification of malocclusion

• Bae J
• Son WS
• Kim SS
• Park SB
• Kim YI

• KMID: 2379648
• DOI: http://doi.org/10.4041/kjod.2017.47.3.151

Abstract

OBJECTIVE
The objective of this study was to investigate the differences in masticatory efficiency among patients with different Angle's classes of malocclusion and to assess the correlation between masticatory efficiency and the occlusal contact area.
METHODS
The mixing ability index (MAI) was calculated for measuring masticatory efficiency of 61 adult patients according to Angle's classifications of malocclusion. The study included 25, 15, and 21 patients with Angle's Class I, II, and III malocclusions, respectively. Silicone interocclusal recording material was used to measure the occlusal contact area.
RESULTS
Both the MAI and occlusal contact area showed the highest average values in the Class I malocclusion group, followed by the Class II and Class III malocclusion groups. No significant difference was observed in the MAI values between the Class I and Class II malocclusion groups (p > 0.05), whereas a significant difference was observed between the Class I and Class III malocclusion groups (p < 0.01) and between the Class II and Class III malocclusion groups (p < 0.05). A weak positive correlation was also observed between the MAI and occlusal contact area (p < 0.01, r² = 0.13).
CONCLUSIONS
The results of this study indicated that masticatory efficiency was the highest in patients with Angle's Class I malocclusion, followed by those with Angle's Class II and Angle's Class III malocclusions. Moreover, a weak positive correlation was observed between masticatory efficiency and the occlusal contact area.

Keyword

Mastication; Efficiency; Angle's classification; Contact area

MeSH Terms

Adult
Classification
Humans
Malocclusion*
Mastication
Silicon
Silicones
Silicon
Silicones

Figure

• 

  Figure 1 Measurements to determine the mixing ability index of patients with Angle's Class I, II, or III malocclusion. A, Imaging apparatus with a view box installed below for monochrome imaging. B, Photograph acquired using view-box lighting. C, Monochrome image converted using PhotoScape 3.7 (MOOII Tech, Seoul, Korea).

• 

  Figure 2 Image analysis of the wax specimen.AH, Total projection area; A, projection area more than 50 µm in thickness; ML, maximum length; MB, maximum breadth; GA, green area; RA, red area.

• 

  Figure 3 Measurements to determine the occlusal contact area of patients with Angle's Class I, II, or III malocclusion. A, Photograph acquired using view-box lighting. B, Monochrome image converted using PhotoScape 3.7 (MOOII Tech, Seoul, Korea).

• 

  Figure 4 Obtained wax bite. A, Class I; B, Class II; C, Class III.

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