Spreader load required for vertical root fracture during lateral compaction ex vivo: evaluation of periodontal simulation and fracture load information.
OBJECTIVE
To evaluate the biomechanical influence of the periodontium on spreader load measuring required for vertical root fracture (VRF).


METHODS
Fully developed permanent incisors (n = 32) from 4 fresh goat mandibles were used. All teeth were subjected to standardized root canal instrumentation and divided into 2 groups: Teeth of group A were tested within natural sockets, and teeth of group B were mounted in artificial sockets and then tested. Spreader was driven to standard depth repeatedly, and insertion load was recorded constantly until intentional VRF.


RESULTS
Fracture load in group A varied from 5.9 kg to 25.1 kg, and in group B from 4.3 kg to 26.9 kg. No statistical difference was found between the 2 groups in terms of fracture load or plane of fracture (P > .05).


CONCLUSIONS
Periodontal simulation by acrylic resin and elastomeric impression material was deemed to be reliable. The inability of fracture load to reveal information about crucial events of the phenomenon was evident.
Soros
Constantinos
C
Department of Endodontology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece. csoros@dent.auth.gr
Zinelis
Spiros
S
Lambrianidis
Theodoros
T
Palaghias
George
G
D000180:Acrylic Resins / Q000737:chemistry; D000818:Animals; D001696:Biomechanical Phenomena; D003764:Dental Materials / Q000737:chemistry; D020724:Elastomers / Q000737:chemistry; D006041:Goats; D007180:Incisor; D008953:Models, Anatomic; D010519:Periodontium / Q000503:physiopathology*; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012388:Root Canal Irrigants / Q000627:therapeutic use; D012389:Root Canal Obturation / Q000295:instrumentation* / Q000379:methods; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000209:etiology*; D014092:Tooth Root / Q000293:injuries / Q000503:physiopathology*; D020390:Tooth Socket / Q000503:physiopathology
D000180:Acrylic Resins; D003764:Dental Materials; D020724:Elastomers; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants