After performing SRP, what is a common cause for a 1-2mm reduction in probing depth?

A 1-2 mm reduction in probing depth after scaling and root planing (SRP) is primarily indicative of healing within the periodontal tissues, particularly the junctional epithelium. After periodontal therapy, such as SRP, the junctional epithelium undergoes a healing process where it re-establishes itself along the root surface. This healing reduces the depth of the periodontal pocket, which is measured during probing.

The reformation of the junctional epithelium is essential as it helps stabilize the attachment of the gums to the tooth, thereby decreasing probing depths. During this healing phase, the inflammatory response diminishes, and there is a reduction in pocket depths due to the resolution of inflammation and the regeneration of healthy tissue. This process effectively contributes to improved periodontal health and is a desirable outcome following SRP.

In contrast, other options do not directly relate to the specific reduction in probing depth post-SRP. The presence of calculus typically indicates a need for SRP rather than a result of it, plaque accumulation suggests ongoing disease rather than healing, and while the repair of gingival tissue is a component of overall healing, it is more so the reformation of the junctional epithelium that specifically accounts for probing