Tetracyclines are used in dentistry as an adjunct to scaling and root planing in which condition?

• A. Endodontic infections
• B. Periodontitis
• C. Dental caries
• D. Temporomandibular joint disorder

Answer: (B)

Tetracyclines are used as an adjunct to scaling and root planing in periodontitis because they do more than just kill bacteria in the pocket. They reach high levels in gingival crevicular fluid, helping to curb the subgingival biofilm and, importantly, to slow tissue destruction. They inhibit matrix metalloproteinases, the enzymes that break down collagen in periodontal ligaments and bone, and they also have anti-inflammatory effects. This combination helps reduce pocket depths and improve attachment gains beyond what SRP alone achieves, which is why this antibiotic is employed as an adjunct in periodontal therapy. The other conditions listed aren’t treated with tetracyclines in this context: endodontic infections are addressed with root canal treatment and selective antibiotics if needed, caries management focuses on remineralization and restorations, and temporomandibular joint disorders involve occlusion and muscle-focused therapies rather than adjunctive antibiotics with SRP.