<P> 5 . Test Cavity--This technique is only used when the results produced by all other methods above are inconclusive . High speed burs are used to make the test cavity . Patient is asked whether painful sensation is felt during drilling . Pulpal vitality is indicated if there is any sensitivity or pain felt by the patient . </P> <P> However, these traditional testing methods have some disadvantages compared to the pulp vitality test in which the pulp blood circulation is evaluated instead . Major limitations of the traditional pulp sensitivity test include: </P> <Ul> <Li> Likelihood to elicit an uncomfortable and sometimes painful sensation in the patient . </Li> <Li> May yield false positive or false negative results . These tests only indicate the pulpal sensory fibres' vitality but do not always reflect the stage and extent of pulpal disease . </Li> <Li> Subjective nature of the test . The pulp sensibility test depends on the patient's response to a particular stimulus and the dentist's interpretation of that response . </Li> </Ul> <Li> Likelihood to elicit an uncomfortable and sometimes painful sensation in the patient . </Li>

Which of the following is not part of a tooth