Karnataka, bangalore. Annexure- II proforma for registration of subjects for dissertation



Download 37.23 Kb.
Date conversion28.01.2017
Size37.23 Kb.
RAJIV GANDHI UNIVERSITY OF HEALTH SCIENCES

KARNATAKA, BANGALORE.
ANNEXURE- II
PROFORMA FOR REGISTRATION OF SUBJECTS FOR DISSERTATION


1.

NAME OF THE CANDIDATE AND ADDRESS( in block letters )



DR. SRILAKSHMI.J

P. G. STUDENT,

DEPARTMENT OF PROSTHODONTICS,

THE OXFORD DENTAL COLLEGE,

BOMMANAHALLI,

HOSUR ROAD,

BANGALORE- 560068.

2.

NAME OF THE INSTITUTION



THE OXFORD DENTAL COLLEGE,

HOSPITAL AND RESEARCH CENTER,

BANGALORE- 560068.

3.

COURSE OF THE STUDY AND SUBJECT



MASTER OF DENTAL SURGERY,

PROSTHODONTICS INCLUDING CROWN AND BRIDGE AND IMPLANTOLOGY.

4.

DATE OF ADMISSION TO COURSE



30TH MAY 2008


5.




TITLE OF THE TOPIC:
A COMPARITIVE EVALUATION OF ZIRCONIUM OXIDE CERAMIC
CROWNS CEMENTED WITH THREE TYPES OF CEMENTS : AN
INVITRO STUDY.





6.




BRIEF RESUME OF INTENDED WORK

6.1 NEED FOR THE STUDY:

The increase of patient’s desire for aesthetics has resulted in the use of all ceramic restorations in the posterior as well as anterior region. The acceptance of all ceramic restorations has increased because of their inherent aesthetics,

excellent biocompatibility , improved physical properties and mechanical properties. The shear stress formed in the sintered zirconium causes martensitic transformation, inhibiting opening of the crack and increasing the energy necessary for further crack growth. Variety of cements are available today but the information about the retentive strength of these cements is limited. Hence this study is under taken to determine the ability of these cements to retain zirconium oxide ceramic crowns .


6.2 REVIEW OF LITERATURE :

A study was conducted on the retention of zirconium oxide ceramic crowns

with three types of cements.The study concluded that within the limitations of this study , the 3 luting agents with mean removal stresses ranging 5.0 to 6.1 MPa were not significantly different .The use of a composite resin cement with a bonding agent did not yield higher coping retention compared to other 2 cements.1

An invitro study was conducted on retentive strength of zirconium oxide ceramic crowns using different luting agents. The study concluded that the compomer cement ,the resin modified glass-ionomer cement and the self adhesive resin luting agent had the same level of retentive quality as the resin luting agents, superbond C& B,and panavia. Rocatec pre-treatment of the ceramic surface did not improve the retentive strengths of compolute and superbond C& B.2

A study was conducted on bond strength of luting cements to zirconium oxide ceramics. The study concluded that the bond strengths for twinlook and panavia 21 were quite low ,and only superbond showed a clinically acceptable bond strength .3

A study was conducted on reliability and properties of ground yttria –stabilized tetragonal zirconia polycrystals ( Y-TZP) – zirconia ceramics. The study concluded that inner surface grinding significantly reduces the strength and reliability of Y-TZP zirconia compared with the lapped controls.4


An invitro study was conducted to evaluate shear bond strengths of resin to densely- sintered high purity zirconium oxide ceramic after long term storage and thermal cycling. The study concluded that artificial aging significantly reduced bond strength. A bonding/ silane coupling agent containing an adhesive phosphate monomer can achieve superior long term shear bond strength to airborne –particle abraded procera all zircon restoration with either one of the 2 resin luting agents tested.5


6.3 OBJECTIVES OF THE STUDY :

To evaluate and compare shear strength of three different cements

used for luting zirconium oxide ceramic crowns.




.
7



MATERIALS AND METHODS :

7.1 SOURCE OF DATA :

Recently extracted mandibular first molars are collected and stored in jar containing a liquid sterilant(0.5% sodium hypochlorite solution) for a week. Later the specimens were stored in normal saline/ tap water .


7.2 METHOD OF COLLECTION OF DATA :
The extracted molars were prepared with a flat occlusal surface having 5-degree taper and 4-mm axial length. The surface areas of the prepared teeth were determined using a mathematical formula & screw gauge . The specimens were distributed equally into 3 cementation groups(n=8). Zirconium oxide ceramic copings with an occlusal bar to facilitate removal were fabricated using computer aided design/ computer assisted manufacturing (CAD/CAM) technology. The copings were seated with seating force of 10 kg per tooth using a self adhesive composite resin ( Rely X U 100 ), resin composite luting cement( Variolink ii ) and self etching composite resin cement (smart cem ). Later the cemented copings were removed along the path of insertion using a universal testing machine at a cross head speed of 0.5mm/min. The removal force and the deformation was recorded. A 1-way analysis of variance (ANOVA) was used to analyze the data.


7.3 INSTRUMENTS :

CERCON CAD/CAM UNIT , INSTRON UNIVERSAL TESTING MACHINE ,


SCREW GUAGE.



7.4 Does the study require any investigation or intervention to be conducted on

patients or other humans or animals?

NOT APPLICABLE



7.5 Has ethical clearance been obtained from your institution?

NOT APPLICABLE





8



LIST OF REFERENCES :

1. Rosario P.palacious,Glen H. Johnson,Keith M.Phillips and Aerial J.Raigrodski : Retention of zirconium oxide ceramic crowns with three types of cement. Journal of Prosthetic Dentistry 2006;96:104-14.


2. Claus –Peter Ernst , Priv.Doz , Udo Cohnen , Elmar Stender and Brita Willershausen : In vitro retentive strength of zirconium oxide ceramic crowns using different luting agents. Journal of Prosthetic Dentistry 2005;93:551-8.
3. Per Derand , Tore Derand , Odont Dr : Bond strength of luting cements to zirconium oxide ceramics. International Journal of Prosthodontics 2000;13:131-135.
4.R.G.Luthard , M.Holzhuter , O.Sandkuhl , V.Herold , J.D.Schnapp , E.Kuhlisch and M.Walter : Reliability and properties of ground Y-TZP- Zirconia Ceramics. Journal of Dental Research 2002; 81(7):487-491.
5.Markus B.Blatz , Dr Med Dent ,Avishai Sadan , Javier Martin , Brien Lang;In vitro evaluation of shear bond strengths of resin to densely-sintered high purity zirconium –oxide ceramic after long-term storage and thermal cycling. Journal of Prosthetic dentistry 2004;91:356-62.



The database is protected by copyright ©dentisty.org 2016
send message

    Main page