Australian Dental Council (ADC) Practice Test

Internal resorption is the correct answer because this type of resorption occurs from within the tooth, specifically affecting the pulp chamber or canal, and is typically not associated with external factors such as trauma or avulsion. Internal resorption is usually initiated by pulp inflammation or injury and occurs independently of the tooth's position in the alveolus or whether the tooth has been replanted after avulsion.

Understanding the other types of resorption helps highlight why they are not the answer. External resorption generally occurs due to external factors, such as pressure from adjacent teeth or orthodontic treatment, often following events like avulsion and subsequent replantation. Inflammatory resorption is linked to pulp damage or inflammation, leading to the breakdown of tooth structure due to the body's response to infection or trauma, which can also be influenced by the replantation process. Replacement resorption, also known as ankylosis, involves the replacement of dental tissue with bone due to the loss of the periodontal ligament after tooth avulsion and replantation.

In summary, internal resorption is distinct from these other forms, as it arises from internal stimuli rather than the consequences of trauma and can develop independently of any outside influences, making it the correct choice in this context.