# LSTR Technique With CTZ Antibiotic Paste in Primary Molar: 5-Year Follow-Up Case Report

## TL;DR

A 5-year follow-up case shows that the LSTR technique with CTZ antibiotic paste can successfully preserve a primary molar instead of conventional pulpectomy.

## Contribution

This case expands the potential use of LSTR in primary molars with furcation involvement, typically treated with pulpectomy.

## Key findings

- The LSTR technique preserved a primary molar with furcation involvement for 5 years.
- The treated tooth remained functional and symptom-free with radiographic healing.
- LSTR proved to be a less invasive and effective alternative to pulpectomy in this case.

## Abstract

Reports describing long-term outcomes of the lesion sterilization and tissue repair (LSTR) technique in primary molars are limited. This paper presents a distinctive case in which a primary molar with complete root development and furcation involvement—usually an indication for conventional pulpectomy—was instead treated with LSTR, a technique generally recommended in advanced root resorption. The case adds evidence on the potential indications and clinical versatility of this approach in pediatric dentistry. A pediatric patient with uncooperative behavior presented with discomfort in a primary molar. Clinical and radiographic examination revealed pulp necrosis, complete root formation, and a furcation lesion. Although pulpectomy was the conventional indication for such findings, LSTR was chosen as a conservative alternative. Treatment consisted of the placement of an antibiotic mixture in the pulp chamber to disinfect and sterilize the root canal system without mechanical instrumentation, with the objective of controlling infection and promoting tissue repair. At the 5-year follow-up, the tooth remained functional and symptom-free, with radiographic evidence of healing and tissue regeneration, demonstrating favorable long-term outcomes. This case shows that LSTR can provide favorable long-term outcomes even in situations where pulpectomy would traditionally be indicated. It supports LSTR as a less invasive and effective option for preserving primary molars until their natural exfoliation.