Dental Materials Commons^™

Enhanced Human Periodontal Ligament Stem Cell Viability And Osteogenic Differentiation On Two Implant Materials: An Experimental In Vitro Study, Engy Adel Ahmed Farag, Sara Fikry Dr, Shereen N. Raafat

Dentistry

Background: Surface roughness of dental implants impacts the survival of adult periodontal stem cells and rate of differentiation. This research was conducted to test how human periodontal ligament stem cells behaved on yttria stabilized tetragonal zirconia polycrystals and polyetheretherketone (PEEK) discs with different surface topographies.

Methods: Discs roughening was prepared by sandblasting. Stem cells were cultivated on zirconia discs with a polished surface, polyetheretherketone (PEEK) discs with a polished surface, sandblasted zirconia discs and sandblasted polyetheretherketone (PEEK) discs. Cells viability was assessed after 24, 48, 72 hours. Scanning electron microscopy was used to examine the adherence and attachment of cells. …

Effect Of Overlay Material Type And Design On Fracture Resistance Of Mod Cavities In Molars. (In-Vitro Study), Sara Adel Botros, Mohamed Fouad Haridy, Shaimaa Gad

Dentistry

Objective: To evaluate the influence of restoration material type (CAD/CAM lithium disilicate blocks and reinforced composite blocks) and restoration design on fracture resistance of molars with MOD cavities. Methods and Materials: A total of 54 sound human molars were divided into 2 groups (n=9) according to: 1) material type: lithium disilicate CAD/CAM blocks and reinforced composite CAD/CAM blocks; 2) restoration design: overlay with intra-coronal extension or without intra-coronal extension. Additional 18 samples were assigned to positive control group (sound molars, n=9) and negative control group (unrestored MOD cavities, n=9). Standardized MOD cavities were prepared with occlusal width 3 mm, cavity …

Effect Of Different Polishing Systems On Surface Roughness And Color Stability Of Lithium Disilicate Ceramics, Mahmoud Al Ankily, Fatma Makkeyah

Dentistry

Objective: This study aimed to investigate the effect of two polishing systems on the surface roughness and color stability of lithium disilicate ceramic. Materials and Methods: Forty disc-shaped lithium disilicate samples were constructed and cemented into a cavity prepared onto the labial surface of freshly extracted bovine teeth; The samples were divided into four groups (10 samples per group); C: Control, SS: Scaling only, SE: Scaling followed by polishing using Eve Diapro lithium disilicate polishers, SD: Scaling followed by polishing using Diatech ShapeGuard ceramic polishing plus kit. The surface roughness was measured before scaling, after scaling and finally after the …

An In Vitro Evaluation Of Surface Roughness, Color Stability And Bacterial Accumulation Of Lithium Disilicate Ceramic After Prophylactic Periodontal Treatment, Fatma Makkeyah, Tarek Salah Morsi, Marwa Mohamed Wahsh, Amr Saleh El-Etreby

Dentistry

Objective: To evaluate the effect of scaling procedures using different ultrasonic tips on the surface roughness, color stability and bacterial accumulation of lithium disilicate ceramic. Material and Methods: Scaling procedure was carried out using ultrasonic scaler (Satalec, Acteon, North America) with stainless-steel tip (US), titanium tip (UT) and plastic tip (UP), on disc shaped lithium disilicate samples cemented into a cavity prepared onto the labial surface of freshly extracted bovine teeth (10 samples per group). The samples were stored in coffee solution in an incubator at 37°C for 12 days, which is equivalent to 1 year of coffee consumption. The …

Pre-Heating Of Dual-Polymerized Resin Core Foundation System: Effect On Micro-Shear Bond Strength, Degree Of Conversion And Ultimate Tensile Strength, Sara Adel Botros

Dentistry

This study evaluated the effect of pre-heating a dual-polymerized adhesive and a dual-polymerized core build-up resin composite on their dentin micro-shear bond strength (mSBS), degree of conversion (DC%) and ultimate tensile strength (UTS). For mSBS, 45 human molars were divided into 9 groups (n ¼ 5) according to two factors: (1) Adhesive temperature (25 C/32 C/40 C) and 2- Resin composite temperature (25 C/32 C/40 C). Dual-polymerized adhesive (Futurabond U/FBU) was applied over occlusal dentin at each temperature following the manufacturer’s instructions. Four dual-polymerized composites (Rebilda DC/RDC, VOCO) micro-cylinders (1.2 mm diameter 1 mm height) were built-up over each dentin …

Flexure Strength Of Methacrylate- And Ormocer-Based Bulk Fill Resin Composites: Effect Of Material Thickness And Distance To Photo-Polymerization Device., Sara Adel Botros

Dentistry

This study evaluated the effect of thickness and photo-polymer- ization distance on flexure strength of two bulk fill resin compo- sites. In total, 96 rectangular-shaped resin composite bars were divided into eight experimental groups (n ¼ 12/group) according to the three experimental factors; Factor 1: Material (X-tra fil and Admira Fusion X-tra), Factor 2: Thickness (2 mm and 4 mm) and Factor 3: photo-polymerization distance (2 mm and 8 mm). The bars were prepared with fixed 2 mm width and 2 mm length but differed in thickness (2 mm or 4 mm). The bars were light cured either at 2 …

Preheating-Temperature Affects Nanoleakage And Degree Of Conversion Of Dual-Cured Adhesive/Resin-Composite, Sara Adel Botros, Farid Sabry El-Askary, Zainab Diaa Soliman, Dalia Ibrahim El-Korashy

Dentistry

No abstract provided.

Effect Of Surface Treatment And Storage Time On Immediate Repair Bond Strength Durability Of Methacrylate- And Ormocer-Based Bulk Fill Resin Composites., Sara Adel Botros

Dentistry

The aim of this study was to evaluate the effect of surface treatment and storage time on immediate repair bond durability of methacrylate- and ormocer-based bulk fill composites. In total, 265 discs were divided into 32 groups (n = 8/group) according to: (1) Material: X-tra fil and Admira Fusion X-tra; (2) Surface treatment: oxygen inhibition; matrix; Futurabond M+; Silane/Futurabond M+; Admira Bond; Silane/Admira Bond; ceramic repair system; and Silane/Cimara bond; and (3) Storage time: 24 h and 6 months. Each disc received three micro-cylinders from the same material. Specimens were subjected to micro-shear bond strength testing either at 24 h …

Effect Of Different Scaling Methods And Materials On The Enamel Surface Topography: An In Vitro Sem Study, Mahmoud Al Ankily, Fatma Makkeyah, Mohamed Shamel, Mahmoud Bakr

Dentistry

Aims and Objectives: Scaling is important for maintenance of gingival and periodontal conditions. These procedures have a harmful effect on the dental hard tissues. The aim of this study was to investigate the effects of hand and ultrasonic instruments made of stainless and titanium on the surface properties of enamel. Materials and Methods: Forty extracted premolars were used in this in vitro study and were randomly divided into four groups (n = 10). Group I received ultrasonic scaling with stainless steel tip, group II received ultrasonic scaling with titanium tip, group III hand scaling with stainless steel tip, and group …

Assessment Of Physical Properties Of A Zno/E ~Sealer Modified By Adding Moringa Oleifera: An Experimental In-Vitro Study, Engy M. Kataia, `Maram E. Khallaf, Nada Omar, Yousra Aly, Nancy Elshafei

Dentistry

Aim: In an attempt to move toward exploration of the antibacterial properties of herbal products, this study evaluated the effect of how the addition of Moringa would affect the physical properties of the commercial Endofil sealer. Materials and Methods: An experimental in vitro study was performed using three experimental sealers. There were four groups in this study: Group A (ZnO/E sealer alone), Group B (ZnO/E and Moringa root), Group C (ZnO/E and Moringa leaf), and Group D (ZnO/E and Moringa leaf extract liquid). Measurements were carried out according to International Organization for Standardization (ISO) standardization 6876:2012. Moringa oleifera was added …

Effect Of Pre-Heating Temperatures On Microshear Bond Strength And Degree Of Conversion Of A Dual-Cured Resin Core Foundation, Sara Adel Botros

Dentistry

Aim: To evaluate the effect of pre-heating temperatures of a dual-cured adhesive and a dualcured resin composite as well as tubule orientation on micro-shear bond strength (µSBS) to dentin. The degree of conversion (DC%) of the adhesive and the composite was also evaluated at the different temperatures. Materials and Methods: For µSBS, 90 human molars were randomly divided into 18 groups (n=5) according to the three experimental factors. Factor 1: Adhesive temperature, Factor 2: Resin composite temperature; and Factor 3: Tubule orientation (occlusal or axial). Adhesive and composite temperatures were set at 25ºC, 32ºC and 40ºC. The adhesive was applied …

Flexural Strength Of Nano-Hybrid Resin Composite As A Function Of Light Attenuation Distance And Specimen Dimension, Farid Sabry El-Askary Pro. Dr., Sara Adel Botros Dr., Mohamed Salah Abdelaziz Nassif Pro. Dr., Mutlu Özcan Prof. Dr.

Dentistry

This study evaluated ascending order of light attenuation distance (0, 2, 4, 8 mm) and specimen dimensions (2 × 2 × 10, 2 × 2 × 12, 2 × 2 × 15 mm3) differing from requirements of ISO 4049 (2 × 2 × 25 mm3) on the flexural strength of nano-hybrid resin composite. Specimens (N = 160) were prepared accordingly and randomly assigned into groups for the factors studied. Specimens were photo-polymerized from increased distances through 1, 2, 3 and 5 overlapping cycles depending on the specimen length after which they were subjected to three-point bending test (0.5 mm/min). …

Influence Of Curing Protocol On Bond Strength Of Self-Etching Adhesives, Sara Adel Botros, Farid Sabry El-Askary, Mohamed Salah Nassef

Dentistry

No abstract provided.

Effect Of Light Distance Specimen Length On Flexural Strength Of Resin-Composite, Sara Adel Botros, Farid Sabry El-Askary, Mohamed Salah Nassef

Dentistry

No abstract provided.

Effect Of Polymerization Protocol On The Degree Of Conversion Of Photo- And Dual-Polymerized Self-Etch Adhesives, Lamiaa Mahmoud Moharam Dr., Sara Adel Botros Dr., Farid Sabry El-Askary Pro. Dr., Mutlu Özcan Prof. Dr.

Dentistry

This study investigated the effect of different polymerization protocols on the degree of conversion (DC%) of various photo-polymerized and dual-polymerized self-etch adhesive resins. Five different photo-polymerized (All-Bond Universal, Bisco; G-ænial Bond, GC; Futurabond M+ LC, VOCO; Single Bond Universal LC, 3M ESPE and Peak Universal Bond, Ultradent) and four dual-polymerized self-etch adhesives (Futurabond U, VOCO; Gradia Core SE, GC; Futurabond M+ DC, VOCO and Single Bond Universal DC, 3 M ESPE) were tested. All adhesives were applied on potassium bromide pellets (KBr) following the manufacturer’s instructions. The KBr pellets were divided into 10 experimental groups for the photo-polymerized adhesives and …