Salwa Khier - Academia.edu (original) (raw)

Papers by Salwa Khier

Research paper thumbnail of Split-increment Placement Technique: Effect on Cuspal Deflection in Class II Composite Restorations

Research paper thumbnail of Semi-Split Bulk Filling Technique In Large Occlusal Bulk-Fill Resin Composite Restorations

Journal Of Oral Medicine And Dental Research

When composite resin hardens by light curing, it shrinks and undergoes deformation which occurs i... more When composite resin hardens by light curing, it shrinks and undergoes deformation which occurs in one region more than other regions within the composite bulk. This behavior is mainly related to variations in bonding to enamel and dentin of surrounding cavity walls. Bonding to surrounding cavity walls creates restrained shrinkage which develops tensile stresses within the composite bulk. The developed tensile stresses act against the tensile strength of the composite resin, and may cause cracks in enamel or composite, as well as residual strain at the adhesive interface, forming marginal and internal gaps. Using the bulk filling technique, a bulk of 4 mm increment of bulk-fill resin composite is placed in a deep Class I cavity. Within the composite bulk, shrinkage displacement occurs axially in the top region more than in the bottom region, resulting in debonding and gap formation at the pulpal floor. This gap is associated with the

Research paper thumbnail of Awake Bruxism Intensified During COVID-19 Pandemic by Cumulative Stress – An Overview

Journal of Clinical Research in Dentistry, 2020

COVID-19 pandemic may produce prolonged and unaccustomed emotional stress which appears to accumu... more COVID-19 pandemic may produce prolonged and unaccustomed emotional stress which appears to accumulate during such difficult times. The cumulative stress may have a profound impact on a wide range of health outcomes, including oral health. Persons under such intensified stress are more likely to clench their jaws or grind their teeth during wakefulness, that is, awake bruxism. Identification of such bruxism can present a challenge for dental professionals and it often goes unnoticed until harmful orofacial effects occur. Lack of knowledge of such bruxism among dental professionals may result in oral complications such as damage to teeth, facial or jaw muscle pain, and teeth sensitivity. The aim of this overview is to highlight the awake bruxism which could be developed/intensified during COVID-19 pandemic by excessive stress and to present the several aspects related to this dental condition.

Research paper thumbnail of Revisiting the Concept of Diagonal Pre-cure Splitting of Horizontal Increments in Direct Composite Restorations

Journal of Dental Health and Oral Research, 2020

The unavoidable, inherent property of polymerization shrinkage in composite resins generates stre... more The unavoidable, inherent property of polymerization shrinkage in composite resins generates stresses in direct composite restorations which are detrimental to composite material, prepared tooth structure and interfacial bond. Several restorative techniques have been advocated to minimize these stresses and increase the restoration success rate. One such technique is the split-increment technique which is based on the concept of diagonal pre-cure splitting of horizontal increments for the relief of shrinkage stresses by creating contraction joints in each composite increment prior to light curing. This mini review aims to revisit this concept for enhancing its understanding and providing more concise guidelines for its application in moderate-to-large cavities in the cervical, occlusal, and proximal areas.

Research paper thumbnail of In-Vitro Corrosion Measurements of Ni-Ti Wrought Alloys

Nickel-titanium (Ni-Ti) orthodontic wire alloys are the current focus of intensive research activ... more Nickel-titanium (Ni-Ti) orthodontic wire alloys are the current focus of intensive research activity. Several new brands have been introduced. These wires are capable of being activated or deactivated at a nearly constant force level. The purpose of this investigation was to characterize the potentiodynamic polarization behavior for various Ni-Ti wire alloys and to compare their in-vitro corrosion. Six different types of Ni-Ti wires were selected, Nitinol SE, Sentinol, NiTi, Titanal, Orthonol and Nitinol alloys, with cross-section dimensions of: 0.016 and 0.018 inch for round specimens or 0.018x0.025 and 0.021x0.025 inch for rectangular specimens. Specimens were maintained in an artificial saliva which was adjusted to a pH = 6. A 500 ml air-exposed saliva solution was used in a Princeton corrosion cell. The anodic and cathodic polarization experiments were conducted using an Aardvark potentiostat. The potentiodynamic behavior of all six Ni-Ti wires was generally similar. Sentinol, T...

Research paper thumbnail of Developing Knowledge among Dentists about Somatic Symptom Disorder in Dental Patients-A Mini Review

Dental Research and Management, 2020

Dentists are not trained in dental school to identify and recognize patients with Somatic Symptom... more Dentists are not trained in dental school to identify and recognize patients with Somatic Symptom Disorder (SSD) before initiating dental treatment. Lack of such recognition could result in misdiagnosis, inefficient management of treatment time, and dental treatment failure. The aim of this mini review is to develop awareness and provide basic knowledge about SSD among dentists. Several recommendations are made to assist dental students and dentists in attaining basic knowledge and training related to this psychiatric disorder.

Research paper thumbnail of Split-increment Technique: An Alternative Approach for Large Cervical Composite Resin Restorations

The Journal of Contemporary Dental Practice, 2007

Aim This article proposes and describes the split-increment technique as an alternative for place... more Aim This article proposes and describes the split-increment technique as an alternative for placement of composite resin in large cervical carious lesions which extend onto the root surface. Technique Two flat 1.5 mm thick composite resin increments were used to restore these cervical carious lesions. Prior to light-curing, two diagonal cuts were made in each increment in order to split it into four triangular-shaped flat portions. The first increment was applied to cover the entire axial wall and portions of the four surrounding walls. The second increment was applied to fill the cavity completely covering the first one and the rest of the four surrounding walls as well as sealing all cavity margins. Clinical Significance This technique results in the reduction of the C-factor and the generated shrinkage stresses by directing the shrinking composite resin during curing towards the free, unbonded areas created by the two diagonal cuts. The proposed technique would also produce a mor...

Research paper thumbnail of Split increment horizontal layering: a simplified placement technique for direct posterior resin restorations

General Dentistry, 2005

A new simplified technique for restoring moderate-to-large Class I occlusal cavities has been pro... more A new simplified technique for restoring moderate-to-large Class I occlusal cavities has been proposed. This technique utilizes split increment horizontal placement of composite resin, combined with shade or chroma stratification. It is believed that this technique will minimize the detrimental effects of polymerization shrinkage on the adhesive interface and cavity walls.

Research paper thumbnail of Structural Characterization, Biomechanical Properties and Potentiodynamic Corrosion of Nickel-Titanium Orthodontic Wire Alloys

The metallurgical structures, biomechanical properties and potentiodynamic polarization behavior ... more The metallurgical structures, biomechanical properties and potentiodynamic polarization behavior for a wide variety of nickel-titanium orthodontic wire alloys have been investigated. These parameters were determined using x-ray diffraction techniques, differential scanning calorimetry, bending and tension tests, and in vitro corrosion equipment. The relative amount of austenite and martensite phases in the wire structure were qualitatively determined at room temperature for both as-received and heat treated wires. The phase transformation temperatures, martensite start M$\sb{\rm s}$, martensite finish M$\sb{\rm f}$, austenite start A$\sb{\rm s}$ and austenite finish A$\sb{\rm f}$ were established for the martensite reactions in all of the NiTi orthodontic wires. The existence or absence of superelastic behavior for these wires was determined along with their activation-deactivation capabilities using bending and tension tests. The potentiodynamic polarization for the different wire alloys was carried out to compare their in vitro corrosion behavior

Research paper thumbnail of Size -interaction Between Finishing Abrasive Grits and Filler Particles of Composite Resins During Finishing

Research paper thumbnail of Retention of Class II Resin-bonded Amalgam Restorations

Research paper thumbnail of The Effects of Gamma Radiation on the Tensile Strength and Microhardness properties of Composite Restorative Resins

Research paper thumbnail of Shear Bond Strength of Resin-bonded Amalgam

Research paper thumbnail of Mechanical and Thermal Characterization of Dental Casting Waxes

Egyptian dental journal

ABSTRACT

Research paper thumbnail of Behavior and Structure of Wrought Wire Clasps as Influenced by Their Attachment Methods

Research paper thumbnail of Failure Analysis of Root Canal Files

Research paper thumbnail of An In-vitro Investigation of the Cytotoxicity of Recent Gingival Retraction Materials

Research paper thumbnail of Microleakage of Cervical Composite Restorations Using Three Incremental Placement techniques

Research paper thumbnail of Amorphus Calcium Phosphate-Containing Dental Products: Rationale and Applications

Research paper thumbnail of Composite resin restorations of large class II cavities using split-increment horizontal placement technique

General dentistry

The split-increment horizontal placement of composite resin, combined with shade or chroma strati... more The split-increment horizontal placement of composite resin, combined with shade or chroma stratification, provides a simplified technique for restoring large Class II cavities. This placement technique makes it possible to relieve the polymerization shrinkage stresses generated at the adhesive interface, resulting in an improved marginal seal, especially at the gingival margin. The proposed technique can be a useful tool for clinicians to provide high-quality posterior composite restorations with long-term clinical success.

Research paper thumbnail of Split-increment Placement Technique: Effect on Cuspal Deflection in Class II Composite Restorations

Research paper thumbnail of Semi-Split Bulk Filling Technique In Large Occlusal Bulk-Fill Resin Composite Restorations

Journal Of Oral Medicine And Dental Research

When composite resin hardens by light curing, it shrinks and undergoes deformation which occurs i... more When composite resin hardens by light curing, it shrinks and undergoes deformation which occurs in one region more than other regions within the composite bulk. This behavior is mainly related to variations in bonding to enamel and dentin of surrounding cavity walls. Bonding to surrounding cavity walls creates restrained shrinkage which develops tensile stresses within the composite bulk. The developed tensile stresses act against the tensile strength of the composite resin, and may cause cracks in enamel or composite, as well as residual strain at the adhesive interface, forming marginal and internal gaps. Using the bulk filling technique, a bulk of 4 mm increment of bulk-fill resin composite is placed in a deep Class I cavity. Within the composite bulk, shrinkage displacement occurs axially in the top region more than in the bottom region, resulting in debonding and gap formation at the pulpal floor. This gap is associated with the

Research paper thumbnail of Awake Bruxism Intensified During COVID-19 Pandemic by Cumulative Stress – An Overview

Journal of Clinical Research in Dentistry, 2020

COVID-19 pandemic may produce prolonged and unaccustomed emotional stress which appears to accumu... more COVID-19 pandemic may produce prolonged and unaccustomed emotional stress which appears to accumulate during such difficult times. The cumulative stress may have a profound impact on a wide range of health outcomes, including oral health. Persons under such intensified stress are more likely to clench their jaws or grind their teeth during wakefulness, that is, awake bruxism. Identification of such bruxism can present a challenge for dental professionals and it often goes unnoticed until harmful orofacial effects occur. Lack of knowledge of such bruxism among dental professionals may result in oral complications such as damage to teeth, facial or jaw muscle pain, and teeth sensitivity. The aim of this overview is to highlight the awake bruxism which could be developed/intensified during COVID-19 pandemic by excessive stress and to present the several aspects related to this dental condition.

Research paper thumbnail of Revisiting the Concept of Diagonal Pre-cure Splitting of Horizontal Increments in Direct Composite Restorations

Journal of Dental Health and Oral Research, 2020

The unavoidable, inherent property of polymerization shrinkage in composite resins generates stre... more The unavoidable, inherent property of polymerization shrinkage in composite resins generates stresses in direct composite restorations which are detrimental to composite material, prepared tooth structure and interfacial bond. Several restorative techniques have been advocated to minimize these stresses and increase the restoration success rate. One such technique is the split-increment technique which is based on the concept of diagonal pre-cure splitting of horizontal increments for the relief of shrinkage stresses by creating contraction joints in each composite increment prior to light curing. This mini review aims to revisit this concept for enhancing its understanding and providing more concise guidelines for its application in moderate-to-large cavities in the cervical, occlusal, and proximal areas.

Research paper thumbnail of In-Vitro Corrosion Measurements of Ni-Ti Wrought Alloys

Nickel-titanium (Ni-Ti) orthodontic wire alloys are the current focus of intensive research activ... more Nickel-titanium (Ni-Ti) orthodontic wire alloys are the current focus of intensive research activity. Several new brands have been introduced. These wires are capable of being activated or deactivated at a nearly constant force level. The purpose of this investigation was to characterize the potentiodynamic polarization behavior for various Ni-Ti wire alloys and to compare their in-vitro corrosion. Six different types of Ni-Ti wires were selected, Nitinol SE, Sentinol, NiTi, Titanal, Orthonol and Nitinol alloys, with cross-section dimensions of: 0.016 and 0.018 inch for round specimens or 0.018x0.025 and 0.021x0.025 inch for rectangular specimens. Specimens were maintained in an artificial saliva which was adjusted to a pH = 6. A 500 ml air-exposed saliva solution was used in a Princeton corrosion cell. The anodic and cathodic polarization experiments were conducted using an Aardvark potentiostat. The potentiodynamic behavior of all six Ni-Ti wires was generally similar. Sentinol, T...

Research paper thumbnail of Developing Knowledge among Dentists about Somatic Symptom Disorder in Dental Patients-A Mini Review

Dental Research and Management, 2020

Dentists are not trained in dental school to identify and recognize patients with Somatic Symptom... more Dentists are not trained in dental school to identify and recognize patients with Somatic Symptom Disorder (SSD) before initiating dental treatment. Lack of such recognition could result in misdiagnosis, inefficient management of treatment time, and dental treatment failure. The aim of this mini review is to develop awareness and provide basic knowledge about SSD among dentists. Several recommendations are made to assist dental students and dentists in attaining basic knowledge and training related to this psychiatric disorder.

Research paper thumbnail of Split-increment Technique: An Alternative Approach for Large Cervical Composite Resin Restorations

The Journal of Contemporary Dental Practice, 2007

Aim This article proposes and describes the split-increment technique as an alternative for place... more Aim This article proposes and describes the split-increment technique as an alternative for placement of composite resin in large cervical carious lesions which extend onto the root surface. Technique Two flat 1.5 mm thick composite resin increments were used to restore these cervical carious lesions. Prior to light-curing, two diagonal cuts were made in each increment in order to split it into four triangular-shaped flat portions. The first increment was applied to cover the entire axial wall and portions of the four surrounding walls. The second increment was applied to fill the cavity completely covering the first one and the rest of the four surrounding walls as well as sealing all cavity margins. Clinical Significance This technique results in the reduction of the C-factor and the generated shrinkage stresses by directing the shrinking composite resin during curing towards the free, unbonded areas created by the two diagonal cuts. The proposed technique would also produce a mor...

Research paper thumbnail of Split increment horizontal layering: a simplified placement technique for direct posterior resin restorations

General Dentistry, 2005

A new simplified technique for restoring moderate-to-large Class I occlusal cavities has been pro... more A new simplified technique for restoring moderate-to-large Class I occlusal cavities has been proposed. This technique utilizes split increment horizontal placement of composite resin, combined with shade or chroma stratification. It is believed that this technique will minimize the detrimental effects of polymerization shrinkage on the adhesive interface and cavity walls.

Research paper thumbnail of Structural Characterization, Biomechanical Properties and Potentiodynamic Corrosion of Nickel-Titanium Orthodontic Wire Alloys

The metallurgical structures, biomechanical properties and potentiodynamic polarization behavior ... more The metallurgical structures, biomechanical properties and potentiodynamic polarization behavior for a wide variety of nickel-titanium orthodontic wire alloys have been investigated. These parameters were determined using x-ray diffraction techniques, differential scanning calorimetry, bending and tension tests, and in vitro corrosion equipment. The relative amount of austenite and martensite phases in the wire structure were qualitatively determined at room temperature for both as-received and heat treated wires. The phase transformation temperatures, martensite start M$\sb{\rm s}$, martensite finish M$\sb{\rm f}$, austenite start A$\sb{\rm s}$ and austenite finish A$\sb{\rm f}$ were established for the martensite reactions in all of the NiTi orthodontic wires. The existence or absence of superelastic behavior for these wires was determined along with their activation-deactivation capabilities using bending and tension tests. The potentiodynamic polarization for the different wire alloys was carried out to compare their in vitro corrosion behavior

Research paper thumbnail of Size -interaction Between Finishing Abrasive Grits and Filler Particles of Composite Resins During Finishing

Research paper thumbnail of Retention of Class II Resin-bonded Amalgam Restorations

Research paper thumbnail of The Effects of Gamma Radiation on the Tensile Strength and Microhardness properties of Composite Restorative Resins

Research paper thumbnail of Shear Bond Strength of Resin-bonded Amalgam

Research paper thumbnail of Mechanical and Thermal Characterization of Dental Casting Waxes

Egyptian dental journal

ABSTRACT

Research paper thumbnail of Behavior and Structure of Wrought Wire Clasps as Influenced by Their Attachment Methods

Research paper thumbnail of Failure Analysis of Root Canal Files

Research paper thumbnail of An In-vitro Investigation of the Cytotoxicity of Recent Gingival Retraction Materials

Research paper thumbnail of Microleakage of Cervical Composite Restorations Using Three Incremental Placement techniques

Research paper thumbnail of Amorphus Calcium Phosphate-Containing Dental Products: Rationale and Applications

Research paper thumbnail of Composite resin restorations of large class II cavities using split-increment horizontal placement technique

General dentistry

The split-increment horizontal placement of composite resin, combined with shade or chroma strati... more The split-increment horizontal placement of composite resin, combined with shade or chroma stratification, provides a simplified technique for restoring large Class II cavities. This placement technique makes it possible to relieve the polymerization shrinkage stresses generated at the adhesive interface, resulting in an improved marginal seal, especially at the gingival margin. The proposed technique can be a useful tool for clinicians to provide high-quality posterior composite restorations with long-term clinical success.