LSTR technique with CTZ paste for the treatment of pulp necrosis in deciduous molars. Case report.

Abstract

Introduction The main goal of pulp therapy is to maintain the integrity and health of teeth and their supporting structures. In pediatric dentistry, the treatment of primary molars diagnosed with irreversible pulpitis or pulp necrosis is one of the great challenges in clinical practice due to the complexity of root anatomy, working time, and difficulty for correct instrumentation. The "Lesion Sterilization Tissue Repair" (LSTR) technique aims to sterilize the lesion and repair tissues through the use of antibiotic pastes without the need to instrument the root canals. Case report A 9-year-old female patient attends the dental clinic asymptomatically. In the clinical examination, the second primary mandibular molar on the left side (tooth #75) presents an active and cavitated dental caries lesion, abscess, and grade I mobility. On the periapical radiograph, it presents a radiolucent area in the furcation region, suggesting the diagnosis of pulp necrosis. For pulp treatment, the LSTR technique with CTZ paste was chosen, composed of chloramphenicol, tetracycline, zinc oxide and eugenol. Subsequently, the molar was restored with a stainless steel crown. After 8 months, the tooth is asymptomatic, with satisfactory restoration, physiological mobility, and gingival integrity; radiographically there is no radiolucency in the furcation region and pathological bone resorption. Conclusion The endodontic treatment in the primary molar with pulp necrosis using the LSTR technique with CTZ paste presented excellent clinical and radiographic results.