Meena A, Jain V, Singh N, Arora N, Jha R
Department of Prosthodontics, All India Institute of Medical Sciences, New Delhi, India.
J Oral Rehabil. 2014 Feb;41(2):87-92. doi: 10.1111/joor.12122. Epub 2013 Dec 21.
The aim of the study was to assess changes in bite force and masticatory efficiency in shortened dental arch (SDA) subjects rehabilitated with implant-supported restoration for 1st molar. Ten SDA subjects with bilaterally missing mandibular molars (experimental group) were recruited. In each subject, one tapered threaded implant was placed bilaterally in 1st mandibular molar region and restored. Masticatory efficiency was evaluated objectively by measuring the released dye from chewed raw carrots, with a 'spectrophotometer' at 530 nm preoperatively and at 3 months after restoration. Bite force was evaluated using 'bite force measuring appliance' preoperatively, at 6 weeks and at 3 months after restoration. Ten completely dentate-matched subjects (in terms of age, sex, height and weight) acted as control. The results revealed that as compared with the control group, the experimental group showed significantly less (P < 0.05) mean maximum bite force at pre-restoration and at 6 weeks after restoration. Although at 3 months the mean maximum bite force value was less than the control group but the mean difference was statistically insignificant. The mean difference of masticatory efficiency between control and experimental group was statistically significant (P < 0.05) before restoration, but was statistically insignificant at 3 months after restoration. Thus it was concluded that after the restoration of mandibular arch with implant-supported prosthesis, both bite force and masticatory efficiency of all SDA subjects increased and were comparable to that of matched completely dentate subjects after 3 months.
本研究的目的是评估接受下颌第一磨牙种植支持修复的短牙弓（SDA）患者的咬合力和咀嚼效率的变化。招募了10名双侧下颌磨牙缺失的SDA患者（实验组）。在每位患者双侧下颌第一磨牙区域植入一枚锥形螺纹种植体并进行修复。术前及修复后3个月，使用分光光度计在530nm波长下通过测量咀嚼生胡萝卜释放的染料来客观评估咀嚼效率。术前、修复后6周及3个月使用咬力测量装置评估咬合力。10名年龄、性别、身高和体重匹配的全口牙齿完整的受试者作为对照组。结果显示，与对照组相比，实验组在修复前及修复后6周的平均最大咬合力显著降低（P<0.05）。虽然在3个月时平均最大咬力值低于对照组，但平均差异无统计学意义。修复前对照组与实验组咀嚼效率的平均差异有统计学意义（P<0.05），但在修复后3个月无统计学意义。因此得出结论，在下颌牙弓采用种植支持修复后，所有SDA患者的咬合力和咀嚼效率均有所提高，且在3个月后与匹配的全口牙齿完整的受试者相当。
