Yi-Lin Ping; Cheng-Liang Yao; Wen-Ze Han; Er-Ling Yuan; Hee-Moon Kyung; Xiu-Ping Wu & Li Bing

To investigate the effect of adenoid hypertrophy on the morphological development of the mandible in adolescents with different vertical facial types of Class II malocclusion, 104 patients who met the inclusion criteria were selected. Cone Beam Computed Tomography (CBCT) was used to measure the angle and linear parameters before and after treatment, and a total of 23 related parameters were measured in all three-dimensional models using Invivo5.0 software. Independent-samples t-test was conducted to observe whether there was a statistically significant difference between the groups' data, P-values < 0.05 were considered statistically significant. Experimental results confirmed that adenoid hypertrophy had a significant effect on mandibular morphogenesis in Class II malocclusion high angle adolescents (P<0.05) and a lesser effect on mandibular morphogenesis in Class II malocclusion homogeneous adolescents (P>0.05). The differences in the horizontal, coronal and vertical openness of the mandible in relation to the skull were statistically significant (P<0.05) in the hypertrophic hypergoniacal cases compared to the non-hypertrophic Class II malocclusion hypergoniacal cases, while mandibular Angle width GoR-GoL, mandibular volume length Co-Pog, mandibular body length L-a and mandibular branch length L-b, chin height B-Me and chin thickness C-C ́ index difference were statistically significant (P<0.05); The differences in the development of mandibular opening relative to the cranium, mandibular length and width, and mandibular ascending length and width were not statistically significant (P>0.05) compared with non-adenoidal hypertrophy in Class II malocclusion homogeneous cases, the difference of chin thickness C-C ́ in chin morphology was statistically significant (P < 0.05). This study provides a theoretical basis for the clinical treatment of patients with various skeletal facial types affected by adenoid hypertrophy.

KEY WORDS: Adenoid hypertrophy; Class II malocclusion; Vertical facial types; Mandibular morphology; Cone Beam Computed Tomography.

YI-LIN P.; CHENG-LIANG Y.; WEN-ZE H.; ER-LING Y.; HEE-MOON, K.; XIU-PING W. & LI BING. Study on the effect of adenoid hypertrophy on the morphological development of mandible in adolescents with different vertical facial types of Class II malocclusion. Int. J. Morphol., 42(6):1713-1719, 2024.