Resin cement thickness in oval-shaped canals: oval vs. circular fiber posts in combination with different tips/drills for post space preparation.
OBJECTIVE
To evaluate the cement thickness around oval and circular posts luted in oval post spaces prepared with different drills/tips.


METHODS
Extracted premolars were endodontically treated and obturated, then randomly divided into three groups (n = 5) according to the tips/drills used for post-space preparation and to the type of fiber post luted: medium grit oval tip + oval posts, fine grit oval tip + oval posts, Mtwo Post File drill + circular posts. The specimens were sectioned in horizontal slices; one slice per canal third was chosen for each post-space, resulting in three slices for each specimen. The distances between the canal wall and the post perimeter were measured on SEM images of each slice.


RESULTS
The fine grit tip + oval post group obtained statistically significant lower cement thicknesses than the other groups (P < 0.05), in particular in the apical third. The MtwoPF + circular post group showed the highest cement thickness, comparable to that of the medium tip + oval post group. A good post fitting in oval-shaped canals can be obtained using a fine grit oval tip combined with oval posts.
Department of Fixed Prosthodontics and Dental Materials, School of Dental Medicine, University of Siena, Italy.
Ivanovic
I
Coniglio
Franklin
F
Garcia-Godoy
Elisa
E
Magni
Carlos Augusto
CA
Carvalho
Marco
M
Ferrari
D000134:Acid Etching, Dental; D002484:Cementation; D003188:Composite Resins / Q000737:chemistry; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D018130:Diamond / Q000737:chemistry; D004867:Equipment Design; D005460:Fluorides, Topical / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation*; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D019553:Tooth, Nonvital / Q000534:rehabilitation; D014464:Ultrasonic Therapy / Q000295:instrumentation
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005460:Fluorides, Topical; C074316:FluoroCore; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements; D018130:Diamond