Most accurate method of determination of working length in a tooth with open apex:
Correct Answer: Moisture on paperpoint
Description: Advantages of apex locators
Provide objective information with high degree of accuracy.
Accurate in reading (90-98% accuracy).
Some apex locators are also available in combination with pulp tester, so can be used to test pulp vitality.
Disadvantages of apex locators
Can provide inaccurate readings in following cases:
Presence of pulp tissue in canal
Too wet or too dry canal
Use of narrow file
Blockage of canal
Incomplete circuit
Low battery
Chances of overestimation.
May pose problem in teeth with immature apex.
Incorrect readings in teeth with periapical radiolucencies, and necrotic pulp associated with root resorption, etc., because of lack of viable periodontal ligament.
Category:
Dental
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