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RAJIV GANDHI UNIVERSITY OF HEALTH SCIENECES

KARNATAKA, BANGALORE

ANNEXURE II

PROFORMA FOR REGISTRATION OF SUBJECTS FOR DISSERTATION

1. Name o !"e #a$%&%a!e a$%

a%%'e(( )&$ B*o#+ Le!!e'(

  DR. ASHOK.K.B

DEPT. OF CONSERVATIVE DENTISTRY AND

ENDODONTICS,

VYDEHI INSTITUTE OF DENTAL SCIENCES AND

RESEARCH CENTRE,

-/, EPIP AREA, NALLURAHALLI, 0HITEFIELD,BANGALORE 234 433.

/. Name o !"e I$(!&!5!&o$ VYDEHI INSTITUTE OF DENTAL SCIENCES AND

RESEARCH CENTRE, BANGALORE 6 234433.

7. Name o (!5%8 a$% (59:e#! MASTER OF DENTAL SURGERY )MDS IN

DEPARTMENT OF CONSERVATIVE DENTISTRY

AND ENDODONTICS.

;. Da!e o A%m&((&o$ ;!" JUNE /41/.

2. T&!*e o !"e To

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3. BRIEF RESUME OF THE INTENDED 0ORK 

3.1 Nee% o' !"e (!5%8=

In the recent past esthetics has become a priority for most patients, due to which tooth whitening

continues to be a rapidly growing area in esthetic dentistry.

Whitening tooth pastes are used commonly and available over the counter. The whitening effectof these tooth pastes are achieved by the incorporation of abrasive and bleaching components

used commonly and in varying concentrations. These pastes are applied with conventional or

motorized tooth brush without any technical assistance and have gained attraction due to ease of

use.

In this perspective patients are to be considered who opt for tooth whitening procedures having

existing composite restorations. Nanofilled composites were introduced with the aim of reducing

 polymerization shrinage and higher resistance to traction, compression and fracture as well as

an improvement in optical properties.

!ne of the factors determining the clinical longevity of a restoration is its surface characteristics.

"urface roughness, color stability and micro hardness are important factors to be considered

when esthetics and functions of anterior restorations are evaluated.

Thus, the aim of this study is to evaluate the effect of two herbal and one normal whitening

toothpaste on the color stability and surface roughness of a nanofilled resin composite.

3./ Re>&e? o L&!e'a!5'e= 

• # study was conducted to determine the effect of 1$% carbamide peroxide bleaching

agent on color change and surface topography of different composite veneering

materials &'ilte ()$* &)+ "-, sthet / &0entsply India, and #dmira

&oco,2ermany.The results showed bleaching reagents induced significant color 

change and minimal surface roughness on the test materials. 1

• # study was done to compare the microhardness of human enamel and microhybrid

composite resin after brushing with two whitening toothpastes.The results showed that

the use of whitening toothpaste decreases the micro hardness of microhybrid composite

resin.3

• # study was done to investigate the alteration of surface roughness of the nanofilled

composite 'ilte ()$* )+4"-5, caused by simulated brushing associated with the

use of mouth rinses with or without alcohol. The results showed that there was

significant alterations in surface roughness of composite influenced by alcohol and no

significance for distilled water and mouth rinses were observed. )

• # study was done to evaluate the effect of chlorhexidine solution on the micro6hardness

and surface roughness of three different restoratives &nanoionomer, Nano 7eramic

composite and giomer.The results showed that long exposure to *.3% chlorhexidine di6

3

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gluconate had resulted in increase of surface roughness and decrease of microhardness

of tested materials.8

• # study was done to compare the effect of in6office and home bleaching gels and of 

whitening tooth pastes, on the color stability and microhardness of two resin composites

and one resinmodified glass6ionomer cement.  The results showed that the nonofilled

composite showed significant color change after treatment with a bleaching gel

$.

 

3.7 O9:e#!&>e( o !"e (!5%8=

To 7ompare the ffects of three whitening toothpastes &9imalaya, 9i!ra6"hine toothpaste,

0abur,salt:lemon tooth paste and 7olgate Total #dvanced Whitening tooth paste on "urface

roughness and color stability of an universal nanohybrid 7omposite ;esin material&I-"

mpress 0irect

@.1 So5'#e o %a!a=

Type of study6 ;andomized 7omparative "tudy.

"tudy area < ydehi Institute of 0ental "ciences and ;esearch 7enter, =angalore

"tudy population< >* specimens of 7omposite resin& I-" mpress 0irect,ivoclar vivadent

@./ Me!"o%( o #o**e#!&o$ o %a!a )&$#*5%&$ (am* specimens as sampling units will be considered in this study : randomly

divided in to ) groups of )* specimens each for each tooth paste.

)

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7ylindrical6shaped steel molds  with dis shaped  specimen wells &3 mm depth D 1$  mm

diameter will be used to mae composite resin specimens. The material used in this study is a

universal nanohybrid composite resin &I-" mpress 0irect,Ivoclar ivadent .

Initially,  the molds will be slightly overfilled with the material, covered with a plastic matrix

strip and pressed flat with a glass slab to   extrude excess material. The composite resin

specimens will be light polymerized according to the manufacturerEs instructions to ensure

adeCuate polymerization. ?ight intensity of the curing unit will be standardized to 8**mW4cmF

using a light intensity meter &radiometer.

 ?ight will be positioned at a distance of 1 mm from each specimen. #ll the specimens will be

 polished by the same medium, fine and superfine discs slow hand piece rotating in one direction

according to the manufacturerEs instructions.

=efore the cycling4brushing, the original color and roughness of each specimen will be analyzed

with a spectrophotometer and a profilometer respectively.

 #ll specimens will be placed in )A G7 distilled water and then brushed for 3 minutes twice

daily with a motorized tooth brush for )* days.

#t the end, the samples will be washed under running water to remove the toothpaste and stored

in distilled water at )A G7 until the readout is taen on the spectrophotometer and profilometer 

for color stability and surface roughness respectively.

The statistical analysis will be performed using #N!# test and t Test

0ata collection methodology <>* specimens of 7omposite resin& I-" mpress 0irect,Ivoclar ivadent

 

@.7 Doe( !"e (!5%8 'e5&'e a$8 &$>e(!&a!&o$( o' &$!e'>e$!&o$( !o 9e #o$%5#!e% o$

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. LIST OF REFERENCES=

1. 2unHan -ruthi et al. ffect of bleaching on color change and surface topography of

composite restorations. Int 0ent 3*1*J3*1*$A8B

3. (. Khamverdi , "h. Kasraie, ?. ;ezaei6"oufi, ". ebeli. 7omparison of the effects of twowhitening toothpastes on microhardness of the enamel and a microhybrid composite

resin.  0ent &Tehran 3*1*JA&)618$

). #na 7arolina de 7arvalho ;ocha, 7ecLlia "antiago #raMHo de ?ima,+aria do 7armo

+oreira da "ilva "antos, +arcos #ntonio apiassM ;esende +ontes. valuation of

surface roughness of a nanofill resin composite after simulated brushing and immersion

in mouthrinses,alcohol and water. +at ;es +arch 3*1*J1)&1

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