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2006| October-December | Volume 9 | Issue 4
August 6, 2008
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Invitro evaluation of flexural strength and flexural modulus of elasticity of different composite restoratives
G Satish, Mohan Thomas Nainan
October-December 2006, 9(4):140-147
Background & Objectives :
The aim of the study was to evaluate the flexural strength and flexural modulus o f five commercially available composites namely Fetric Ceram (Hybrid), Filtek P-60 (Packable), Dyract (Compomer), Filtek Flow (Flowable) and Admira (Ormocer). after aging in water. Methodology: 20 specimens were made using each of the 5 composite materials . and randomly divided into two subgroups containing 10 specimens each. Specimens were stored in distilled water (Subgroup A: 7 days & Subgroup 13: 30 days). Thermocycling of all the specimens was done for 5000 cycles, to simulate the oral conditions. Flexural strength and modulus of the specimens were assessed in a Universal Testing Machine. Data was analyzed using one way ANOVA /Students t-test at a significance level of 0.05.
Results have shown that highest flexural strength and modulus was seen for Group I1 (Filtek P-60) and Group I (Tetric Ceram), followed by Group V (Admira). Group Ill (Dyract) showed lowest flexural strength and Group IV (Filtek flow) showed lowest flexural modulus. After aging in water all the groups showed decreased flexural strength, except for Group IV (Filtek Flow), for which the strength increased. Flexural modulus of all the composites tested increased slightly after aging in water, but was not significant.
Interpretation & Conclusion:
The effect of aging in water on flexural strength and modulus was material dependent. A significant decrease in flexural strength was observed for all the composites, except for Group IV (Filtek flow), after aging in water. Aging had no significant effect on the flexural modulus of any of the composites tested.
Amalgam associated oral lichenoid reaction
M Sunith, M Ramesh Kumar, K Shoba, S Jayasree
October-December 2006, 9(4):148-151
Amalgam is one of the most widely used restorative material in dentistry. However due to continuous low level release of mercury (Hg) from amalgam Fillings, its safety and wide scale use has been questioned. The main concerns relate to the potential toxic effects of Hg and the possibility that Hg may induce adverse immunological effects. With regard to the latter. there have been a number of reports suggesting that amalgam fillings may induce oral lichen planus (OLP) like or oral Lichenoid lesions(OLL)Here we present a case report of Amalgam Associated Oral Lichenoid Reaction (AAOLR) or Amalgam Contact Hypersensitivity Lesions( ACHL)s with emphasis on current review literature.
Wear analysis of nano ceramic composites against a ceramic antagonist
AC Krithika, D Kandaswamy, Emmanuel Solomon Sathish
October-December 2006, 9(4):152-158
Wear is a natural process and is defined as loss of material from the surface caused by mechanical action alone or through a combination of mechanical and chemical action. The purpose of this article is to measure the three body occlusal contact area wear of different restorative materials against a ceramic antagonist since ceramic restorations are common against composite restorations.
Intra-radicular rehabilitation and management of fractured teeth
SenthilKumar Hemamalathi, NagendraBabu Venkatesh Babu, Deivanayagam Kandaswamy
October-December 2006, 9(4):119-122
A variety of post systems, from metal to ceramics are available for the post-endodontic management of severely fractured teeth. The reinforcement of the composite resins by fibers improves their fracture toughness and resistance. The Fiber reinforced composite resin can be a good alternative to conventional post systems. The purpose of this article was to present a clinical case of fractured anterior teeth where fiber reinforced composite was used for the intraradicular rehabilitation of an endodontically treated tooth as well as extraradicular rehabilitation of a fractured tooth. This technique offers a conservative, esthetic and non-invasive treatment. Moreover this technique is economically more acceptable. The polyethylene FRC post and core can serve as a long-lasting provisional treatment in pediatric cases where the growth is not completed yet, or as a permanent treatment option in older patients.
Comparative evaluation of micro-shear bond strength of adhesive resins to coronal dentin versus dentin at floor of pulp chamber - An Invitro Study
Dhanyakumar , Shekhar
October-December 2006, 9(4):123-130
Background and Objectives:
To compare the micro shear bond strengths of coronal dentin and pulp chamber dentin using two bonding systems namely Clearfil SE bond and Single bond.
Thirty molar teeth were collected for the study out of which sixty samples were prepared. Thirty, 2 mm thick slabs of coronal dentin were prepared from each tooth by removing occlusal enamel perpendicular to the long axis of tooth with low speed diamond disc to expose a flat mid coronal dentin and then thirty pulpal floor dentin samples were prepared by sectioning at mid point between floor of pulp chamber and root furcation. These sixty samples were divided into two major groups depending upon dentin location. GROUP I: 30 samples of coronal dentin. GROUP II: 30 samples of dentin at floor of the pulp chamber. Each group was subdivided into two subgroups depending upon the bonding agent used. Subgroup Ia. IIa: Clearfil SE bond. Sub group Ib, IIb: Single bond).
Micro shear bond strength showed higher values to coronal dentin compared to dentin at floor of the pulp chamber and Clearfil SE bond showed higher values compared to Single bond in coronal and dentin at floor of the pulp chamber, but statistically insignificant.
Interpretation and conclusion:
Clearfil SE bond showed higher values compared to Single bond in both coronal dentin and dentin at floor of pulp chamber.
Evaluation of antimicrobial and demineralization inhibitory effects of fluoritop-SR
- An invitro study
Balwant Rai, Rajnish Jain, Simmi kharb, SC Anand
October-December 2006, 9(4):131-133
This study was conducted to compare the caries preventive efficacy of Fluoritop-SR
, the first fluoride varnish manufactured in India, with Bifluorid-12
. The demineralization inhibitory and antimicrobial effects were studied. In the present study, the demineralization inhibitory effect of the bifluorid-12
(available throughout the world) was higher and comparable to the Fluoritop-SR
Histological evaluation of the effectiveness of four instrumentation techniques for cleaning the apical third of root canals - An invitro study
Lalit Chandra Boruah, AC Bhuyan, R Kataki
October-December 2006, 9(4):134-139
The main objective of root canal preparation is to remove vital pulp tissue, residual necrotic materials , debris and infected dentin and thus eliminate most of the micro-organism from the root canal system. The present in vitro study was designed to compare the cleaning efficacy of K-Files (stainless steel), NiTi K- Files, ProTaper(Manual) & ProFile Rotary Systems in cleaning apical third of root canals.
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