The fracture rate of the Kedo-S Square rotary file is quite low in root canal preparation of primary molars, suggests a recent study published in the European Journal of Dentistry.
There is no doubt that pulpectomy is a highly challenging practice in the field of pediatric dentistry and several factors including diagnostic acuity, instruments utilized, and technologies are some crucial factors that contribute to its success. The endorsement of nickel-titanium (Ni-Ti) rotary instrumentation by the pediatric dentist has expanded two-fold over the most recent years.[1] Although a majority of pediatric dentists utilize rotary instrumentation, there is a critical divergence in the variety, frequency, and method of different instrumentation systems employed.

The primary focus of this clinical study was to analyze the probability of occurrence of instrument fracture after root canal preparation of primary molars with the help of Kedo-S Square pediatric rotary file.
Three experienced specialists treated 100 primary maxillary and mandibular molars (335 root canals) using a standardized protocol over 2 months. Biomechanical preparations were carried out using Kedo-S Square file, as per the suggestions given by the manufacturer. Every instrument in Group A helped handle three clinical cases, while for groups B, C and D, they helped in handling 5, 9, and 12 cases, respectively. Making use of an operational microscope, the rotary files, after being pulled out from the canal, were observed. The values were tabulated, and descriptive statistics were performed.
Results:
There were two fractures (2%), of which 1 occurred in group C in the apical 1/3rd of distobuccal canal of maxillary molar, and the other occurred in group D in the apical 1/3rd of mesiobuccal canal of maxillary molar.
The fracture rate of Kedo-S Square rotary file is quite low. It is primarily in the buccal canals of the maxillary molars and the apical third of the root canal that the instrument has a greater probability of separation.
Reference:
Lakshimi Lakshmanan, Ganesh Jeevanandan , Prabhadevi C Maganur , Satish Vishwanathaiah.