Hearing Aids Exam 2 Questions and Answers (100% Correct Answers) Already Graded A+

•Infection risk: diabetes, immunocompromised •Bleeding risk: therapeutic blood thinning •Coughing reflex: vagus nerve stimulation (Arnold's nerve) •Surgery: mastoidectomy, fenestration, tubes •Active infection: bacterial or fungal •Congenital or other malformation [ Ans: ] What are some things we should watch out for in case history pertaining to making ear mold impressions? Explain to them what you are going to do and why you are going to do it. Materiel typically takes 6-10 minutes to set Tell them that you will take 2 impressions of each ear [ Ans: ] Explain ear mold impression process to the patient poor fit patient discomfort feedback problems [ Ans: ] What happens if you make ear mold from poor impressions? •Vinyl polysiloxane (addition-cure silicone) •Silicone (condensation-cure silicone/traditional silicone) •Acrylic (ethyl-methacrylate) [ Ans: ] Three types of impression making materials •Consists of two putty-like materials •Contains sulfur = will react to hand lotions and latex -Wash hands prior to mixing when mixed by hand -If using gloves, use non-latex -If use latex gloves, material will never set up! L -Splay technique (The singles are this material) Best in most cases [ Ans: ] Vinyl polysiloxane impression matieral Consists of one putty and one paste Good for long-term user [ Ans: ] Silicone impression material •Liquid and powder •Comes in pre-measured or in bulk Good for surgical ears [ Ans: ] Acrylic impression material viscosity stability tensile strength [ Ans: ] Three properties to consider regarding impression materials Defined as resistance to flow; how does it come out of syringe? -Low viscosity materials are easy to syringe -Least likely to expand or distort the ear canal -Not good when you need a tight fit [ Ans: ] What is viscosity Ability to maintain shape over time •Impressions can shrink between the time they are made and the time they are processed •Labs often apply a coat of wax to the impression to compensate •Some materials shrink less than others [ Ans: ] What is stability Ability to be stretched/resistance to tearing •Some force has to be used to extract the impression from the ear •Tensile strength poor, impression could stretch or tear [ Ans: ] What is tensile strength high viscosity for long time user ears stability - shrink by 0.5% tensile strength - middle likelihood to tear [ Ans: ] Silicone properties medium viscosity - good for most ears stability - shrink the least by 0.1% or less tensile strength - least likely to tear [ Ans: ] Vinyl Polysiloxane properties low viscosity, good for surgical ears stability - shrink most at 2% to 5% tensile strength - most likely to tear [ Ans: ] Acrylic properties