Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil.
National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil.
Eur Arch Paediatr Dent. 2024 Oct;25(5):669-676. doi: 10.1007/s40368-024-00925-3. Epub 2024 Jul 5.
To analyze the functions of the stomatognathic system in children with or without molar-incisor hypomineralization (MIH).
For this cross-sectional study, 72 children aged 6-12 years were recruited and divided in two groups: with MIH (G1) and without MIH (G2). T-SCAN was used to verify the distribution of occlusal contacts, gnathodynamometer to measure maximum molar bite force, and Iowa Oral Pressure Instrument (IOPI) to assess the strength of facial expression muscles. The t test and paired t test (p ≤ 0.05) were used for statistical comparisons.
The molars affected by MIH exhibited lower distribution of occlusal forces (p < 0.001) and lower maximum molar bite force (p < 0.05) compared to the molars in the control group. However, there was no difference between the MIH-affected sides compared to the unaffected side, nor between the molars affected by MIH and their antagonists (p > 0.05). There were no differences in the forces of the facial expression muscles between the groups.
These findings suggest that MIH significantly impacts occlusal force distribution and bite force, but not facial expression musculature.
分析伴或不伴磨牙牙釉质发育不全（MIH）儿童的咀嚼系统功能。
本横断面研究纳入了 72 名 6-12 岁儿童，分为伴 MIH 组（G1）和不伴 MIH 组（G2）。使用 T-SCAN 验证咬合接触分布，使用测力器测量最大磨牙咬合力，使用爱荷华口腔压力仪（IOPI）评估面部表情肌力量。采用 t 检验和配对 t 检验（p≤0.05）进行统计学比较。
与对照组相比，MIH 受累磨牙的咬合力分布较低（p<0.001），最大磨牙咬合力较低（p<0.05）。然而，MIH 受累侧与未受累侧之间、MIH 受累磨牙与其对颌磨牙之间均无差异（p>0.05）。两组间面部表情肌的力量无差异。
这些发现表明，MIH 显著影响咬合力分布和咬合力，但对面部表情肌无影响。
