Mechanized files developed for deciduous teeth compared to conventional in instrumentation, preparation time and quality of different obturation techniques in resin prototypes

• Grant number: 22/08413-1
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: June 01, 2023
• End date: April 30, 2025
• Field of knowledge: Health Sciences - Dentistry - Pediatric Dentistry
• Principal Investigator: Natalino Lourenço Neto
• Grantee: Bianca Katsumata de Souza
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

Endodontics has had great evolution in recent years, with advances in mechanized techniques and development of new materials for biomechanical root canal preparation, as well as obturation techniques. Despite relevant modernization, little is known about rotary instruments developed specifically for primary teeth. Thus, the aim of this work will be to evaluate the time and biomechanical preparation performed with a file developed for deciduous teeth (Sequence Baby File - SBF) and compare it with different instrumentation techniques, as well as the quality of different obturation techniques in prototypes of deciduous molars instrumented with SBF. For this, 150 canals of a prototyped deciduous second molar will be scanned by the MicroCT system and randomly divided into 6 groups, according to instrumentation: K file, rotary SBF, reciprocating SBF, ProDesign Logic 2 rotary, ProDesign Logic 2 reciprocating files and manuals M. The effective time of Instrumentation will be timed. After preparation, a new scan will be realized and the images will be reconstructed and aligned to the initials. Using the CTan® program, measurements of root canal transportation, amount of resin remaining, touched and untouched walls, ledge formation and root perforations will be performed. In a second step, 40 canals instrumented with SBF will be divided into 4 groups: disposable endodontic tips, K file, lentulo and ultrasound for obturation with endodontic paste of calcium hydroxide and iodoform. After filling, a final scan will be realized and the volumetric percentage of internal voids will be analyzed by specific software. All data obtained will be tabulated and subjected to statistical analysis, considering a 5% level of significance.