the effect of surface treatment on fiber reinforced
DESCRIPTION
surface treatment of fiber postTRANSCRIPT
THE EFFECT OF SURFACE TREATMENT
ON FIBER REINFORCED POSTS
Presented by – Dr. Amit
PG 1st year
The prognosis of endodontically treated teeth depends not only on the success of the endodontic treatment but also on the type of
reconstruction
INTRODUCTION
Endodontically treated teeth may be damaged by decay, excessive wear, previous restorations, lack of
coronal tooth structure.
LEADS TO
Therefore , Require the placement of a post to ensure adequate retention core
CAST METAL POSTS VS FIBER REINFORCED POST
METAL POSTS FIBER POSTS
Why do we need various surface treatments??Fogel via fluid filtration microleakage test evaluated found that none of the post systems tested were capable of consistently achieving a fluid-tight seal.
Similar results were reported by Tjan et al, who used second generation dental adhesives and found that all teeth showed leakage.
In vitro and in vivo studies indicate that failure of glass fiber reinforced post-and-core restorations often occurs because of debonding at the post-resin interface and/or resin- dentin interface as a result of bond deficiencies.
What can we do about the failures??
Authors have investigated
different procedures for improving the
interfacial bond strength between posts and resin-based materials .
These procedures may be divided
into 3 categories:
Pretreatment procedures
Silanization and/or adhesive applicatio
n
Acid etching, airborne-particle
abrasion, and silica coating;
Treatments that
combine both
micromechanical and a chemical component
PRETREATMENT PROCEDURES
Silanization and/or adhesive application
Solvent evaporation
plays an important role
since an incomplete
removal may compromise
coupling
To optimize the chemical
interaction between silane and inorganic surfaces, the
reaction may be catalyzed by acid
treatment or heating.
The chemical bond may be achieved only between the composite resin and the exposed glass fibers of the post.
Bond strength between the epoxy resin-based fiber posts and the methacrylate based resin are not fully enhanced by
silanization
ACID ETCHING , SANDBLASTING AND SILICA COATING
CERAMIC ETCHING WITH HF
CREATES ROUGH SURFACE
MICROMECHANICAL INTERLOCKING WITH RESINOUS CEMENT
DAMAGES GLASS FIBERS, MICROCRACKS, CORROSIVE EFFECTS
Nontreated fiber posts have a relatively smooth
surface which limits mechanical interlocking with resin cements and purely adhesive failure modes are commonly
recorded at the post/composite interfaces
RELIES ON USE OF ALUMINIUM OXIDE PARTICLES MODIFIED BY SILICA.
SILICATE LAYER WELDED ON TO THE TREATED SURFACE BY HIGH SPOT HEAT PRODUCED BY BLASTING PRESSURE IN A PROCESS CALLED TRIBOCHEMICAL COATING.
FOLLOWED BY SILANIZATION OF PRETREATED LAYER; COMBINING CHEMICAL AND MICROMECHANICAL RETENTION.
BLASTING – REMOVES SUPERFICIAL LAYER OF RESINOUS MATRIX
CREATING MICRORETENTIVE SPACES ON POST SURFACE
CO-
JET
SYSTE
M
AIR ABRASION
USING SILICA COATED ALUMINIUM OXIDE PARTICLES; CREATES A SILICA LAYER ON THE POST SURFACE.
PENETRATES 15 MICRONS EFFICIENT WHEN COMPARED TO ACID ETCHING, BUT MAY
MODIFY THEIR SHAPE AND FIT INTO ROOT CANALS
EPOXY BASED FIBRE POSTSABRADED WITH 50 MICRONS ALUMINA PARTICLES,2.5 BAR PRESSURE,5 SEC, AT 30MM DISTANCE
BALBOSH AND ASUMUSSEN ET AL – REGIMEN
THIS REGIMEN DID NOT PRODUCE VISIBLE CHANGES OF THE SHAPE OF THE POST AND RESULTED IN INCREASED SURFACE AREA AND MECHANICAL INTERLOCKING WITH THE RESIN CEMENT.
ALTERNATIVE ETCHING TECHNIQUES : CONDITIONING OF EPOXY RESINS WITH KMNO4 – DESMEARING.
FOR METAL PLATING. FIBER POSTS – IMMERSED INTO SOLUTION(H2O2) – 10-15 MIN. REMOVING SURFACE LAYER – MORE SPACES FOR SILANIZATION.
MAIN PROBLEM WITH CONDITIONING TECHNIQUES ----LACK OF SENSITIVITYBOTH THE MATRIX AS WELL AS THE FIBERS OF THE POST AFFECTED BY TREATMENT – RESULTING IN DAMAGE OF THE POST’S INNER STRUCTURE.
SWELLINGETCHING
NEUTRALIZING
REVIEW OF LITERATURE
Main aim of the study was to evaluate the effects of sandblasting combined with silanization as a surface treatment on the bond strength between fiber posts and resin cement. Both sandblasting and silanization can improve the bonding of fiber posts to resin cement. The effect of sandblasting is predominant.This study suggested that fiber posts should be pretreated with sandblasting or combined with silanization before clinical use.COMBINATION OF SANDBLASTING AND SILANIZATION ON THE
BOND STRENGTH BETWEEN FIBER POST AND RESIN CEMENT. WANG YJ, ZHANG L, CHIEFFI N, CHEN JH, FERRARI M INTERNATIONAL DENTISTRY SA VOL. 8, NO. 6
Investigated the effects of pretreatment (silanization) on bond strengths between three different types of fibre posts and 4 resin cements.Concluded that fibre post revealed a significant influence on the bond strengths, whereas the effects of silanization appeared to be clinically negligible
EFFECTS OF SILANIZATION ON BOND STRENGTHS OF FIBRE POSTS TO VARIOUS RESIN CEMENTS. Bitter K, Noetzel J, Neumann K, Keilbassa AM , Quintessence Int 2007;38:121-128
Evaluated the effect of post-silanization heat treatment of a silane agent and rinsing with hot water of silanized CAD/CAM feldspathic ceramic surfaces on the microtensile bond strength between resin cement and the ceramic, before and after mechanical cycling. They concluded that oven drying at 77°C improved the bond strength between the resin cement and feldspathic ceramic, but hot water rinsing reduced the bond strength and should not be recommended.
Effect of Post-silanization Heat Treatments of Silanized Feldspathic Ceramic on Adhesion to Resin Cement. Corazza, Cavalcanti PH, Queiroz SCM J Adhes Dent - 2013
Evaluated the effect of post silanization on the microtensile bond strength (MTBS) of translucent fiber posts to seven flowable composite resins used as core material. The different resin composite materials and the post silanization procedures had a significant effect on MTBS. The application of a silane coupling agent increased MTBS of flowable composite resins to translucent posts.
Post silanization improves bond strength of translucent posts to flowable composite resins. Albaladejo A, Osorio R et al. Journal of Biomedical Materials Research Part B Applied Biomaterials 2007; 82(2):320-4.
This study evaluated the effect of three post surface treatments on quartz-fiber post (a) retention and (b) morphology. Different treatments were performed for the other posts: silanization; etching by hydrofluoric acid 9.5%; sandblasting with 50 μm Al2O3. Retentive post bond strengths were significantly enhanced with any tested post surface pretreatment. The increase in retentive strength was more remarkable in sandblasted and etched posts. Significant changes of post surfaces were SEM observed after different conditioning treatments.Effect of Surface Treatments on Tensile Bond Strength and on
Morphology of Quartz-fiber Posts. Arcangelo C, Amario M et al. 2007
Evaluated the tensile bond strengths and the effect of silanization of fiber posts inserted with different adhesive systems. Concluded that Silanization had no significant effect. Tensile bond strengths were significantly influenced by the type of resin cement. Silanization of fiber post surfaces seemed to have no clinical relevance.
Effect of Adhesive Resin Cements and Post Surface Silanization on the Bond Strengths of Adhesively Inserted Fiber Posts. Wrbas KT, Altenburger MJ et al. Journal of Endodontics 2007;33(7):840-843.
Main aim was to investigate the effects of pretreatment (silanization) on bond strengths between 3 different types of fiber posts and 4 resin cements, respectively. Bond strengths were significantly affected by the resin cement, the pretreatment , and the type of post, but not by thermocycling. The IPN post demonstrated significantly higher bond strengths compared to the other posts. Silanization significantly increased bond strengths compared to those of the control groups.The type of fiber post revealed a significant influence on bond strengths, whereas the effects of silanization appeared to be clinically negligible.Effect of silanization on bond strengths of fiber posts to various
resin cements.Bitter K, Noetzel J et al. Quintessence Int 2007 Feb;38(2):121-8.
The bond strength of composite resin cores to the smooth surface of prefabricated zirconia-based ceramic posts is problematic because it might not be sufficient to ensure stability of the post-and-core system. It is also not clear whether any alteration of the post surface to provide additional mechanical or chemical retention would compromise flexural strength of the posts.CONCLUDED - The use of a tribochemical silica coating process and silanization on zirconia-based ceramic posts increased both the bond strength to composite resin as well as the fracture strength of posts.Effect of silica coating and silanization on flexural and composite-
resin bond strengths of zirconia posts: An in vitro study Xible AA, Tavarez RRJ et al. 2007
Several surface treatments have been proposed for improving the bonding of resin cements or core materials to FRC (fiber-reinforced composite) posts. The possibility of combining chemical and micromechanical retention on post surface provides the most promising adhesion mechanism.This literature review summarizes the research on fiber post surface treatments and provides information related to their benefit in enhancing bond strength to composites, based on the results of original scientific full papers from peer-reviewed journals listed in Pub Med. According to the in vitro results, surface conditioning improves fiber post bonding properties, and the bond strength of pre-treated fiber posts to restorative materials is satisfactory. Long-term clinical studies are needed prior to making a general recommendation for their use.
Surface Treatments for Improving Bond Strength to Prefabricated Fiber Posts: A Literature Review. Monticelli F , Osorio R et al. 2008
Several post surface treatments with or without the application of a bonding agent have been recommended to improve the bond strength of resin cements to posts. A regimen that produces the maximum bond strength of glass fiber-reinforced composite resin posts has not been verified.The purpose of this study was to evaluate the influence of post surface conditioning methods and artificial aging on the retention and microleakage of adhesively luted glass fiber-reinforced composite resin posts. Treating the surface of the posts with phosphoric acid for 15 seconds before cementation produced no significant improvement in post retention. Airborne-particle abrasion of the surface of the post significantly improved post retention
Effects of endodontic post surface treatment, dentin conditioning, and artificial aging on the retention of glass fiber-reinforced composite resin posts. Albashaireh ZS, Ghazal M, Kern M. The Journal of Prosthetic Dentistry Volume 103, Issue 1, January 2010, Pages 31–39
The purpose of this study was to evaluate the effect of 2 chemical solvents, hydrogen peroxide and methylene chloride, on the shear bond strength of quartz and glass fiber posts to a composite resin. There were significant differences between the shear bond strength for LP and CB. There was no significant difference between the S and M groups. The SEM observations demonstrated that the fiber post surfaces were modified after chemical surface treatment techniques. The surface treatment of quartz and glass fiber posts with hydrogen peroxide significantly enhanced the shear bond strength of the composite resin tested due to its ability to dissolve the epoxy resin matrix used in each post
Effects of chemical surface treatments of quartz and glass fıber posts on the retention of a composite resin Yenisey M and Kulunk S , (J Prosthet Dent 2008;99:38-45)
CONCLUSION
Advances in the surface treatments of the fibre posts representing on of the most important factor which has improved the success of the esthetic post systems over the last two decades.
Long term clinical studies supporting the benefits of one technique over the other in the future is requested.