Correlation between inclination of occlusal plane and masticatory path in skeletal malocclusion
10.3760/cma.j.issn.1002-0098.2011.s1.017
- VernacularTitle:骨性错(牙合)者(牙合)平面倾斜度与咀嚼轨迹的相关性初探
- Author:
Xia-Yi WU
1
;
Wei-Sheng CHEN
;
Ya HU
;
En-Bao HE
;
Xue-Feng LIN
Author Information
1. 中山大学光华口腔医学院附属口腔医院
- Keywords:
Mastication;
Cephalometrics;
Malocclusion
- From:
Chinese Journal of Stomatology
2011;46(z1):69-74
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the characteristics of and correlation between the inclination of occlusal plane (IOP) and masticatory path in young adults with skeletal malocclusion.Methods Thirtythree individuals were eligible for this study based on the inclusion criteria.Individuals were grouped by ANB angles.There were ten,six and seventeen cases categorized as group Ⅰ ( normal occlusion with skeletal Class Ⅰ ),Group Ⅱ ( skeletal Class Ⅱ ) and Group Ⅲ ( skeletal Class Ⅲ ),respectively.The following parameters of sagittal anatomical landmarks were studied by lateral cephalometric analysis:ANB,MP-FH,OP-CP (IOP),and OP-FH.Mandibular movement of the incisal point during unilateral-sided gum-chewing was recorded by the BioEGN mandibular kinesiography analyzer and both maximal distances and direction (OP-opening/closing angles ) in sagittal plane were analyzed.Correlation between IOP and maximal distances,direction of masticatory path were analyzed,respectively.Statistical analysis was performed with PASW 17.0 software.Results IOP varied among three groups:group Ⅰ ( - 1.78 ± 5.16) °,group Ⅱ( 0.13 ± 2.31 ) °,group Ⅲ ( - 5.28 ± 4.31 ) ° ( P ＜ 0.05 ).Maximal distances of masticatory path in Group Ⅰ,Ⅱ and Ⅲ were as follow:Vertical length:(20.30 ± 8.92),( 17.60 ± 3.29),and ( 18.25 ± 4.09),Anterior-Posterior width:(2.99 ±7.90),(9.60 ±5.80) and (4.67 ±4.64) mm,Lateral width:(8.79 ±2.22),(7.11 ± 2.03 ) and ( 8.47 ± 1.70 ) mm,respectively.The variation among groups was not ofstatistical significance (P ＞ 0.05 ).OP-opening/closing angles of masticatory path in each level were found increasing from group Ⅱ,group Ⅲ to group Ⅰ.There was significant difference between Group Ⅱ and Group Ⅰ in each level of OP-opening angle.OP-opening/closing angles were not correlated with IOP in group Ⅰ and group Ⅱ ( P ＞ 0.05 ).IOP and OP-opening/closing angles were shown to be positively correlated in group Ⅲ with statistical significance (P ＜ 0.05 ).Conclusions The discrepancy of craniofacial structure has an impact on IOP.Skeletal malocclusion and IOP have no significant influence on the maximal distances of masticatory paths.The direction of masticatory path is influenced by IOP in skeletal malocclusion.
