Craniofacial tissue characteristics in adult Angle class II malocclusions: cephalometric X-ray measurement

doi:10.3969/j.issn.2095-4344.2015.20.011

Abstract

Abstract:

BACKGROUND: Studies have shown that there are large differences in the thickness of the soft tissue overlying hard tissue, and the soft tissue does not uniformly overly the hard tissue, indicating simple hard tissue measurement will not harvest ideal facial profile in clinical treatment of malocclusions.
OBJECTIVE: To study the craniofacial soft and hard tissue characteristics in the adult Angle class II malocclusion, and then to analyze the relationship between Angle class II1 and class II2 malocclusions.
METHODS: Sixty patients with adult Angle II malocclusion who were accepted by the Department of Orthodontics of Stomatological Hospital Affiliated to Jiamusi University from 2011 to 2014, on gender parity, aged 18-38 years
(mean age of 26.3 years), including 30 cases of Angle class II1 and 30 cases of Angle class II2. Differences between the adult Angle class II1 and class II2 malocclusion patients were compared by cephalometric analysis based on X-ray measurement. Statistical correlation analysis was performed.
RESULTS AND CONCLUSION: (1) Comparisons of hard tissue measurement of adult Angle class II1 and Angle class II2 malocclusions showed that: SNB, SND, ANB, FH-NP, U1-SN (P < 0.001), LI-NB (P < 0.01), L1-MP (P < 0.01), U1-L1 (P < 0.001) exhibited statistically significant differences between two groups (P < 0.05). (2) Comparisons of soft tissue measurement of adult Angle class II1 and Angle class II2 malocclusions showed that: there were significant differences in the ULA'-FH, LLNs-FH, ULNs-FH, CmSnUL, E-LL (P < 0.05). (3) There was a correlation between the soft and hard tissue of adult Angle class II1 and Angle class II2 malocclusions in all measurement indexes, but the correlativity exists differently. These findings indicate that for Angle class II1 malocclusion, the maxillary and anterior teeth protrusions have a certain influence on the position of the lower lip; for Angle class II2 malocclusion, only maxillary protrusion can impact the position of the soft tissue of the lower lip. Chin soft tissue has no major changes in Angle class II2 malocclusion, but it varies greatly in Angle class II1 malocclusion. Clinical treatment of adult Angle class II malocclusions is developed based on the craniofacial soft and hard tissue characteristics in orthodontic and orthognathic surgeries.

Key words: Malocclusion, Face, Jaw Abnormalities

CLC Number:

R318

Li Xiao-guang, Man Da-peng, Qi Wei-feng, Kong Yu. Craniofacial tissue characteristics in adult Angle class II malocclusions: cephalometric X-ray measurement [J]. Chinese Journal of Tissue Engineering Research, 2015, 19(20): 3173-3177.

Figures/Tables 5

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