Vowel

Before prosthesis Average% (SD%)

After prosthesis Average% (SD%)

After modification of prosthesis Average% (SD%)

|a|

62.74% (1.55%)

56.64% (2.35%)

25.32% (2.97%)

|e|

61.40% (1.03%)

54.80% (0.92%)

17.34% (2.97%)

|u|

52.93% (1.31%)

44.4% (2.78%)

26.33% (2.60%)