Use of second-generation platelet concentrate (platelet-rich fibrin) and hydroxyapatite in the management of large periapical inflammatory lesion: A computed tomography scan analysis.

Periapical surgery is required when periradicular pathosis associated with endodontically treated teeth cannot be resolved by nonsurgical root canal therapy (retreatment), or when retreatment was unsuccessful, not feasible or contraindicated. Endodontic failures can occur when irritants remain within the confines of the root canal, or when an extraradicular infection cannot be eradicated by orthograde root canal treatment. Foreign‑body responses toward filling materials, toward cholesterol crystals or radicular cysts, might prevent complete periapical healing. We present here a case report wherein, combination of platelet‑rich fibrin (PRF) and the hydroxyapatite graft was used to achieve faster healing of the large periapical lesion. Healing was observed within 8 months, which were confirmed by computed tomography, following improved bone density. PRF has many advantages over platelet‑rich plasma. It provides a physiologic architecture that is very favorable to the healing process, which is obtained due to the slow polymerization process.

Microbiological evaluation of various parameters in ophthalmic operating rooms. The need to establish guidelines.

PURPOSE: Postoperative infections can be caused by a contaminated environment, unsterile equipment, contaminated surfaces, and infected personnel as well as contaminated disinfectants. In order to establish guidelines for microbiological monitoring, a detailed microbiological surveillance was carried out in an ophthalmic hospital. METHOD: Over a period of 21 months, we assessed environmental Bacteria Carrying Particle(BCP) load and surface samples weekly (n = 276); the autoclaving system once a month and repeated whenever the process failed (n = 24); the air conditioning filters for fungal growth once in four months (n = 15), and the disinfectant solution for contamination once in two months (n = 10). Additionally, the personnel involved directly in surgery were screened for potential pathogens such as Staphylococcus aureus and beta haemolytic streptococci. RESULT: On 14 (5.07%) occasions the environment in the operating rooms had a significant risk of airborne infections. Sterilisation of instruments in the autoclaves was unsatisfactory on 4 (16.66%) occasions. Samples from the filters of the air-conditioning units yielded potentially pathogenic fungi on 3 (20%) occasions. Personnel sampling revealed that 5 (8.77%) individuals harboured beta haemolytic Streptococci in the throat and 4 (7.01%) harboured S. aureus in the nasal cavity. The samples of disinfectant in use were not contaminated. CONCLUSION: There is a need to standardise microbiological evaluation protocols for operating rooms.