Users Online: 3706
Export selected to
Citation statistics : Table of Contents
2007| October-December | Volume 10 | Issue 4
September 17, 2008
Most popular articles
Most cited articles
Show all abstracts
Show selected abstracts
Export selected to
Stress distribution in rotary nickel titanium instruments - a finite element analysis
Vinoo Subramaniam, R Indira, MR Srinivasan, P Shankar
October-December 2007, 10(4):112-118
Nickel Titanium endodontic instruments facilitates instrumentation of curved canals. Continuous unidirectional rotation causes development of complex stresses in nickel titanium rotary instruments. The distribution of torsional anti bending stresses depends primarily on the cross sectional design and mass of the instrument to be cut. The finite element analysis is aimed to study and compare stress distribution and behavior of two rotary instruments, protaper and profile. The stress induced phase transformation of nickel titanium alloy is also studied by Finite Element Model, this model when simulated properly shows better understanding of stress analysis than other methods. The analyses are made by applying a concentrated torsional and bending moment to the protaper and profile instrument models. Under equal loads, protaper model showed uniform stress distribution and less elasticity compared to profile model. Profile model is more elastic but, showed stress peaks between flutes.
Treatment of an isolated furcation involved endodontically treated tooth - a case report
Sunitha Raja, Guber Nath, Pamela Emmadi, Ramakrishnan , Ahathya
October-December 2007, 10(4):129-133
Thu successful long-term management of multi-rooted teeth with attachment loss extending into the furcation has been one of the greatest challenges to dentist. Furcation-involvement is not a separate
entity but just an extension of inflammation into the: bi or trifurcation region. However treatment of lesions extending into this region becomes complicated due to the difficulty in instrumentation. Several treatment modalities have been proposed based on the grade of furcation involvement. This paper presents a case report of an endodontically, treated tooth with a furcation involvement. The interdependence of perio-endo lesions and the consequences of inadequate periodontal therapy following endodontic therapy is stressed in this Paper.
Management of class V lesions based on the etiology
Suma Ballal, Savitha Seshadri, S Nandini, Deivanayagam Kandaswamy
October-December 2007, 10(4):141-147
A plethora of materials arc available to the restorative dentist when faced with a class V situation in a dental practice. A lot of misconceptions persist regarding the material to be used in these situations. It is an often overlooked fact that the etiology of a class V plays a very important role in deciding the course of treatment. This descriptive study attempts at describing the definitive guidelines in case selection and treatment plan of a class V lesion. A survey was done to study the choice of material for a class V lesion and to ascertain that percentage of dentists who actually considered the etiology prior to treatment.
Association between microtensile bond strength and microleakage at the resin based composite/dentin interface - an in vitro study
Shilpa K Elizabeth, MK Manjunath
October-December 2007, 10(4):134-140
Background and objective :
True adhesion has been the 'holy grail' of restorative dentistry. Iftrue adhesion of restorative materials to tooth structure is to be achieved, optimal retention must be obtained and microleakage must be prevented. This study was conducted to evaluate the correlation between microtensile bond strength and microleakage using two different adhesives systems, which differed in their mode of adhesion.
Box type Class I occlusal cavities were prepared on twenty molar teeth. The teeth were assigned to two groups Group I (Gluma Comfort Bond and Charisma), Group 11 (i-Bond and Charisma), each comprising of ten teeth. Restored teeth were subjected to thermocycling, followed by dye immersion and sectioning. Microleakage evaluation for the extreme end slices was done using dye immersion technique and then viewed under stereomicroscope. Microtensile bond strength testing of the middle two slices was done using an Universal Testing Machine (Instron).
Statistically, Group I showed higher microtensile bond strength and lower microleakage value when compared to Group 11. A highly significant negative correlation was found between microtensile bond strength and microleakage.
Interpretation and conclusion
· Smear layer removing adhesive system exhibited higher bond strength and less leakage than smear layer dissolving adhesive system. An inverse relationship exits between microtensile bond strength and microleakage.
Evaluation of the pulp chamber morphological measurements in maxillary first premolar in Indian population - an in-vitro study
Nagendrababu Venkateshbabu, Natanasabapathy Velmurugan, Anna Roy, Deivanayagam Kandaswamy
October-December 2007, 10(4):119-121
The aim of this in vitro study was to determine the pulp chamber morphological measurements and also to establish the relationship of cemento enamel junction (CEJ) to the roof of the pulp chamber of maxillary first premolars in Indian population. One hundred extracted human maxillary first premolars were used. Each premolar tooth was radiographed by RVG. Measurements were made by using the grid option in RVG. Results were as follows (Mean ± SD in mm): distance from floor of the pulp chamber to furcation 1.79 ± 0.8mm, distance from roof of the pulp chamber to furcation = 4.66 ± I.06mm, distance from the buccal cusp tip to the furcation = 11.59 ± 1.17mm, distance from the buccal cusp tip to the roof of the pulp chamber =6.93 ± 0.64mm, height of the pulp chamber 2.87 ± 0.99mm. The results of these measurements revealed that morphological measurements of maxillary first premolars in Indian population were similar to previous studies and roof of the pulp chamber coincided with CEJ in 96% of the specimens.
Fracture resistance of premolar teeth with class II preparations restored with light cured composite with beta quartz inserts, light cured' composite and silver amalgam in comparison with intact unrestored teeth - An in vitro study
Priscilla Solomon, Gopi Krishna, A Parameswaran, Gali Pradeep, Deivanayagam Kandaswamy
October-December 2007, 10(4):122-128
An vitro study was designed to evaluate the fracture resistance of maxillary premolars with class II disto occlusal preparations restored with light cured composite with beta quartz' inserts, light cured composites layered incrementally, and silver amalgam in comparison with intact and unrestored teeth. Sixty freshly extracted maxillary premolars were randomly divided into 6 groups of 10 teeth each. All the 60 specimens were then subjected to a compressive load in an Universal Testing Machine (Hounsfield). The loads required to fracture the teeth were recorded and the data, obtained were subjected to statistical analysis and the following results were arrived, Teeth restored' with light cured composite with beta quartz insert showed higher values than light cured composite placed in horizontal increments. The use of the megafiller increased the filler-resin ratio and reinforced the tooth. Composite with, beta quartz, inserts was more resistant to tooth fracture than silver amalgam. Teeth restored with light cured composite incrementally placed in oblique layers. Produced a higher fracture resistance than any other group and showed the closest value to the intact teeth. This was followed in descending order by light , cured composite with beta quartz inserts, silver amalgam and light cured composite placed in horizontal increments. As a class II" restorative material silver amalgam exhibited greater fracture resistance than bulk composite resin placed in horizontal increments.
© 2008 Journal of Conservative Dentistry | Published by Wolters Kluwer -
Online since 10