Apex locator is comparable to conventional radiograph in determining the working length without radiation in the primary teeth. Intraoral digital radiography is the safest method in determining the working length with significant reduction in radiation exposure.Hence, both the techniques can be safely used as alternatives to conventional radiographic methods in determining working length in primary teeth.

Aim : The purpose of this study is to evaluate and compare the clinical and radiographic effectiveness of Ciprofloxacin, Minocycline, Metronidazole combination with Ciprofloxacin, Minocycline and Tinidazole combination when used for Lesion Sterilization and Tissue Repair in primary teeth. Method: 25 healthy children, visiting Dept. of Pediatric & Preventive Dentistry, D.A.P.M.R.V.Dental College, Bangalore, India, aged between 6 - 9 years who were having 30 infected primary teeth are selected and divided into 2 groups. In Group A, a mixture of 3mix-MP Ciprofloxacin, Metronidazole and Minocycline was placed on the floor of the pulp chamber covering the root canal orifices. In Group B a mixture of Ciprofloxacin, Tinidazole and Minocycline was placed as a layer on the floor of the pulp chamber. The procedure was completed in a single visit. Post operative clinical evaluation was done after 1,6,12 and 24 months. Postoperative radiographic evaluation was done at 6,12 and 24 months. Results: No statistically significant difference is observed between both the groups and a combination of Ciprofloxacin, Minocycline and Tinidazole antibacterial drugs can be used on teeth pulpally involved with physiologic root resorption. Conclusion: After a 24 Month follow up, we can conclude that primary teeth with the periradicular lesions, can be conserved by using combination of Ciprofloxacin, Minocycline and Tinidazole antibacterial drugs.

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