The presence of black-pigmented Gram-negative anaerobes in the oral cavity of edentolous subjects

Abstract The aim of this study was to investigate whether black-pigmented Gram-negative anaerobes are part of the indigenous oral flora of edentulous subjects with or without dentures. Group I consisted of 11 subjects with dentures (mean age 63.6 years, range 52–75) and Group II consisted of 39 subjects with complete dentures in both jaws (mean age 59.3 years, range 37–80). Two microbial samples for microbiological examination were taken from each subject. One of them was from the dorsum of the tongue and the other was from saliva. Black-pigmented Gram-negative anaerobes > 10⁷ cfu/ml were found in both samples. In 50 edentulous subjects, they were found more commonly from tongue (40%) than from saliva (26%). None of the subjects had Porphyromonas gingivalis . There was no statistically significant difference ( P > 0.05) between the presence of black-pigmented Gram-negative anaerobes on tongue and in saliva in the two groups. Our results suggested that high levels of black-pigmented Gram-negative anaerobes may belong to the indigenous oral flora in edentulous mouths with or without dentures.     

下颌起排法全口排牙临床效果研究

目的:研究通过比较不同的排牙方式制作的全口义齿对咀嚼次数、咀嚼效率以及患者的主观感受的影响。方法:78例无牙颌患者按照牙槽嵴高度分为正常组和低平组,正常组有患者32例,低平组有患者46例,每组分别戴用上颌起排法和下颌起排法制作的全口义齿,比较咀嚼次数、咀嚼效率和满意度的差别。结果:在戴用上颌起排法制作的全口义齿时,正常组的咀嚼次数高于低平组,差异具有统计学意义(t=3.60,P0.05);戴用下颌起排法制作的全口义齿后,低平组的咀嚼次数高于采用上颌起排法的全口义齿,差异具有统计学意义(t=4.41,P0.05);在戴用上颌起排法制作的全口义齿中,正常组的咀嚼效率高于低平组,差异具有统计学意义(t=5.72,P0.05);而在戴用下颌起排法制作的全口义齿后,低平组的咀嚼效率高于采用上颌起排法的全口义齿,差异具有统计学意义(t=7.16,P0.05)。正常组认为使用下颌起排法制作全口义齿咀嚼能力、稳固感好于上颌起排法,差异均具有统计学意义(P0.05);低平组认为使用下颌起排法制作全口义齿咀嚼能力、稳固感和舒适感好于上颌起排法,差异均具有统计学意义(P0.05)。结论:对于牙槽嵴低平无牙颌患者使用下颌起排法制作的全口义齿,能够有效地增强咀嚼效率,提高义齿的稳定性。