Publications by authors named "Satterthwaite J"
Article Synopsis
- The study evaluated how storage in acidic environments, specifically gastric acid and Coca-Cola, impacts the mechanical properties of CAD/CAM dental materials, including a polymer-infiltrated ceramic network (Vita Enamic), a resin composite block (Cerasmart), and a conventional resin-based composite (Gradia direct).
- After 96 hours of exposure, it was found that the Cerasmart and Vita Enamic materials maintained their flexural strength and elastic modulus, while the Gradia direct material showed a significant decline in flexural strength when stored in gastric acid.
- All materials experienced a decrease in microhardness, with the Gradia direct showing the most significant reduction, and gastric acid causing greater microhardness loss than
Article Synopsis
- The integration of CAD-CAM technology in restorative dentistry has changed the game by incorporating both additive and subtractive manufacturing techniques, yet questions about how print orientation affects the mechanical properties of 3D printed resin materials persist.
- This study aimed to analyze how different print orientations and artificial aging impact the flexural strength (FS) and flexural modulus (FM) of selected 3D printed resins used for definitive and interim dental restorations.
- Results showed that print orientation significantly affects FS and FM, with specimens printed at a 90-degree angle demonstrating better mechanical properties compared to other orientations, particularly among definitive resin materials.
Although advancements in CAD/CAM technology allow for more personalized treatments, it is not clear how modifications in the CAD/CAM milling process could affect the restoration surface conditions and their mechanical behavior. The objective of this study was to evaluate the effect of different CAD/CAM milling protocols on the topography and fracture behavior of zirconia monolithic crowns (3Y-PSZ) subjected to a chewing simulation. Monolithic 3Y-PSZ premolar crowns were milled using three protocols ( = 13) (slow (S), normal (N), and fast (F)).
View Article and Find Full Text PDFArticle Synopsis
- Three-dimensional (3D) printing is being increasingly used in dentistry for producing restorations, thanks to its accuracy and cost-effectiveness, but the material properties can vary based on the printing orientation.
- This study aimed to investigate how different printing orientations and the effects of artificial aging influence the hardness and indentation modulus of various 3D-printed dental resins.
- Results showed that 90° printed specimens generally had the highest hardness at specific times, though after 90 days of aging, hardness levels across orientations were similar, with milled materials demonstrating superior hardness compared to certain 3D-printed resins.
Article Synopsis
- Bioceramic coatings can enhance bone repair and the integration of dental implants, which was the main focus of this study.
- Three different dental implant alloys (two titanium types and one titanium-zirconia) were tested for changes in surface characteristics after air abrasion with bioceramic powders.
- Results showed that while bioceramic application affected surface roughness, changes in calcium and phosphate content were not significantly different across groups, and the treatment continued to dissolve over three weeks.
Statement Of Problem: The influence of different thicknesses, translucencies, and fabrication methods on the spectrophotometric and topographical properties of zirconia-reinforced lithium silicate glass-ceramics (ZLSs) for dental restorations remains unclear.
Purpose: The purpose of this in vitro study was to investigate the effect of thicknesses, translucencies, and fabrication methods on the color stability, translucency parameter, opalescence parameter, whiteness stability, transmitted irradiance, light transmittance, opacity, gloss, and roughness of ZLSs exposed to coffee staining and bleaching treatments.
Material And Methods: Two pressable ZLSs (VITA AMBRIA, VA and Celtra Press, CP) and 2 machinable ZLSs (VITA Suprinity, VS and Celtra Duo, CD) were examined at high translucency (HT) and low translucency (LT) levels in 2 thicknesses (n=160).
Statement Of Problem: The influence of different firing protocols on the topographical, optical, and mechanical properties of fully crystallized computer-aided design and computer-aided manufacturing (CAD-CAM) lithium silicate-based glass-ceramics (LSCs) for dental restorations remains unclear.
Purpose: The purpose of this in vitro study was to investigate the effect of different firing regimens on the surface roughness, gloss, Martens hardness, indentation modulus, biaxial flexural strength, and crystalline structure of fully crystallized CAD-CAM LSCs and the effect of their interposition on the irradiance of a light-polymerization unit.
Material And Methods: Three fully crystallized CAD-CAM LSC blocks were evaluated (N=150): lithium disilicate (Initial LiSi Blocks; LS), zirconia-reinforced silicate (Celtra Duo; CD), and lithium aluminum disilicate (CEREC Tessera; CT).
Aim: The purpose of this study was to i) synthesise TEGDMA-DHEPT microcapsules in a laboratory setting; ii) characterise the resultant microcapsules for quality measures.
Materials & Methods: Microcapsules were prepared by in situ polymerization of PUF shells. Microcapsules characterisation include size analysis, optical and SEM microscopy to measure the diameter and analyse the morphology of PUF microcapsules.
Background: To study the effect of water storage (3 months) on the creep deformation of various CAD-CAM composite structures at the nanoscale and compare it to that at the macroscale.
Methods: Seven CAD-CAM blocks were investigated: five resin-composite blocks (RCB), one polymer-infiltrated ceramic network (PICN) block, and one ceramic-filled polyetheretherketone (PEEK) block. Specimens of each material (n = 6) were separated into two groups (n = 3) according to their storage conditions (24 h dry storage at 23˚C and 3 months storage in 37˚C distilled water).
Objectives: To investigate the effect of different surface treatments on optical, topographical and mechanical properties of CAD/CAM lithium silicate-based glass ceramics (LSC's) and their combined effect on the output of a light curing unit (LCU).
Methods: Four CAD/CAM LSC's were investigated: Lithium Disilicate (Emax CAD; EC), Zirconia-reinforced silicates (Vita Suprinity; VS and Celtra Duo;CD) and Lithium Aluminum Disilicate (CEREC Tessera; CT). Ceramic specimens (n = 240) were divided into six subgroups according to their surface treatment: (a) Control, (b) Hydrofluoric acid (HF) 5%, (c) HF 5% + Neutralizing agent (N), (d) HF 9%, (e) HF 9% +N and (f) Self-etching ceramic primer (SEP).
Background: Surgical guides restrict the flow of cooling agent to osteotomy site, which will lead to a temperature rise that provokes tissue injury. Few studies compared differences in the temperature changes between non-limiting 'conventional' and limiting 'guided' surgical guides during implant site preparation. The objective of this study was to investigate the difference in temperature changes during bone drilling for implant placement using non-limiting and limiting surgical guides at cortical and cancellous bone levels.
View Article and Find Full Text PDFObjective: To investigate the flexural strength of hot isostatically pressed nano 3 mol% yttria partially stabilised zirconia and conventionally sintered micro 3 mole% yttria partially stabilised zirconia. Methods: A total of 40 bar-shaped (2 mm × 4 mm × 16 mm) specimens were prepared from hot isostatically pressed nano 3 mol% yttria partially stabilised zirconia (CeramaZirc Nano HIP, Precision Ceramics) and conventionally sintered micro 3 mole% yttria partially stabilised zirconia (CeramaZirc, Precision Ceramics). Two groups were prepared for each material (n = 10), with one serving as ‘control’ and the other being cyclically loaded using a chewing simulator (7 kg; 250 k cycles): SEM imaging was also undertaken on selected specimens.
View Article and Find Full Text PDFAims Or Objectives: The Syrian crisis has resulted in a significant impact on refugee oral health status, but the scientific literature lacks information characterizing the pattern of tooth extraction in refugees.
Materials And Methods: The current study analyzed the pattern of tooth extraction and the associated sociodemographic factors among 626 (53.4% females, 46.
Purpose: To assess the surface roughness of two different light-cured resin-composites when opposed by monolithic zirconia after simulated mastication.
Materials And Methods: Materials included a direct restorative nanohybrid ( = 10) and an indirect microhybrid ( = 10) resin-composite (Tetric EvoCeram and Sinfony, respectively). The antagonist material was 3 mol% yttria-stabilized tetragonal zirconia polycrystalline ceramic.
Objective: This study is aimed at investigating the treatment options offered to and chosen by patients attending a student prosthodontics clinic and to investigate the effect of the sociodemographic background of participants on implant consideration. . A cross-sectional descriptive study was conducted on 200 participants including their socioeconomic background, treatment options presented, treatment preferences, and implant consideration.
View Article and Find Full Text PDFObjectives: The aim of this in vitro investigation was to assess and compare surface characteristics and nanomechanics of model polymer infiltrated ceramic network (PICN) materials compared to CAD/CAM resin composite blocks.
Material And Methods: Four model PICN materials sintered at different temperatures (Exp.125, Exp.
Aim: The purpose of this study was to evaluate the mechanical properties of an experimental self-healing dental composite model (SHDC) composed of SiO nanoparticles with varying percentages of triethylene glycol dimethacrylate (TEGDMA) monomer and ,-dihydroxyethyl--toluidine (DHEPT) amine microcapsules.
Materials And Methods: Microcapsules were prepared by in-situ polymerisation of PUF shells, as explained in our previous work. The model SHDC included bisphenol A glycidyl dimethacrylate (Bis-GMA:TEGDMA) (1:1), 1 wt% phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide (BAPO), 0.
Background: The Syrian conflict has had a massive impact on the dental health of refugees. Dental extraction is a good indicator of socioeconomic position and degree of oral hygiene, however there is a scarcity of evidence in the scientific literature that characterizes the reasons for extraction in refugees.
Aims And Methods: The current study looked at the extraction causes and related sociodemographic variables of 322 Syrian refugees (46.
Evaluation of the Efficacy of Two Fibre-Reinforced Post Removal Techniques.
Eur J Prosthodont Restor Dent
August 2022
Objective: The aim of this in-vitro study was to compare the amount of material (post and luting agent) and root dentine removed using two methods for removal of endodontic posts.
Methods: Human premolar teeth (n=20) were sectioned at the CEJ and fibre reinforced posts were cemented at a length of 10mm following root canal therapy. Teeth were randomly assigned to two study groups.
Purpose: To characterise the oral hygiene habits, attitudes, and oral health practices in relation to sociodemographic factors among refugees in Jordan and to investigate their impact on the oral health status of these refugees.
Materials And Methods: This cross-sectional study consisted of two parts. First, a face-to-face interview was conducted using a structured questionnaire including demographic and oral health-related questions.
This study aimed to assess water sorption and solubility of CAD/CAM composite blocks compared to CAD/CAM ceramic after 8 months storage in water and artificial saliva. Eight CAD/CAM blocks were investigated: Five resin-composite blocks (RCBs), one polymer-infiltrated ceramic network (PICN) block, one ceramic-filled polyetheretherketone (PEEK) block, and one feldspathic ceramic block. One hundred and twelve specimens were prepared comprising 14 specimens of each of the eight materials.
View Article and Find Full Text PDFBackground: Little is known about the oral disease burden in refugee children and associated risk factors. This cross-sectional study aimed to explore the oral hygiene status and prevalence of caries, and to investigate their association with malocclusion characteristics in a child refugee population.
Methods: 606 Syrian refugee children and adolescents aged 7-19 years, registered as refugees in Jordan and residing in Zaatari camp, were recruited to the study.
Background: The popularity of implant dentistry is increasing dramatically, but the success of implant treatment depends on a patient's knowledge and expectations.
Methods: This study aimed to assess dental implant knowledge among refugees as a treatment option (n = 565), using face-to-face interviews. The frequency distribution of the responses in general and according to age, gender and education was calculated.
Parental perception and acceptance of silver diamine fluoride treatment among Syrian refugees.
Community Dent Health
November 2021
Objective: Silver diamine fluoride (SDF) is an effective cariostatic agent, although staining associated with treatment is a significant impediment to its acceptability.
Basic Research Design: A cross-sectional study of Syrian refugees to identify acceptance of SDF treatment.
Methods: Information was collected on: sociodemographics, medical/dental child history, dental status (dmft/DMFT), andperceptions of photographs of SDF-treated teeth.
Background: There is a scarcity of data concerning the prevalence and pattern of malocclusion and orthodontic treatment needs in Syrian refugee. In this study, extra and intra-oral features of malocclusion and the dental health component of the Index of Orthodontic Treatment Need (IOTN) were reported.
Methods: Examination of 606 Syrian children/adolescents refugees attending Zaatari clinic was carried out (males = 280, females = 326, mean age = 11.