Prosthodontics and Prosthodontology Commons^™

Evaluation Of Heated Cure Acrylic Immersed In Ozonated Water, Shawq Azmi Tawfeeq, Aseel Mohammed Al-Khafaji

Maaen Journal for Medical Sciences

Background: Denture cleansing is an important step that can prevent the spread of infection and improve a patient's health, the durability of the dentures, and the overall quality of life; therefore, it is necessary to choose a suitable cleanser that, in addition to being effective, does not have an unfavorable effect on the qualities of the denture base resin itself when used for an extended period.

Aim: This research aims to assess the effects of ozonated water on the surface roughness and hardness of heat-cured acrylic resin by immersion technique.

Materials: Sixty bars shape made of heat-cured acrylic were manufactured. …

Independent Effects Of Hiv And Antiretroviral Therapy On The Oral Microbiome Identified By Multivariate Analyses, Clifford J. Beall, Elizabeth A. Lilly, Carolina Granada, Kelly Treas, Kenneth R. Dubois, Shahr B. Hashmi, Jose A. Vazquez, Michael E. Hagensee, Ann L. Griffen, Eugene J. Leys, Paul L. Fidel

School of Dentistry Faculty Publications

The oral microbiome is an important predictor of health and disease. We recently reported significant yet modest effects of HIV under highly active antiretroviral therapy (ART) on the oral microbiome (bacterial and fungal) in a large cohort of HIV-positive (HIV+) and matched HIV-negative (HIV-) individuals. As it was unclear whether ART added to or masked further effects of HIV on the oral microbiome, the present study aimed to analyze the effects of HIV and ART independently, which also included HIV- subjects on preexposure prophylaxis (PrEP) therapy. Cross-sectional analyses of the effect of HIV devoid of ART (HIV+ ART- versus matched …

Enhanced Periodontal Ligament Stem Cell Viability And Osteogenic Differentiation On Two Implant Materials: An Experimental In Vitro Study, Sara Fikry, Shereen Nader Dr, Engy Farag Dr

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, PEEK discs with a polished surface, sandblasted zirconia discs and sandblasted PEEK discs. Cells viability was assessed after 24, 48, 72 hours. Scanning electron microscopy was used to examine the adherence and attachment of cells. Osteoblastic differentiation …

Effect Of Different Span Lengths With Different Total Occlusal Convergences On The Accuracy Of Intraoral Scanners, Omar Elsergany

Dentistry

Purpose: The aim was to assess the effect of span lengths and total occlusal

convergence (TOC) on the accuracy of intraoral scanners .

Materials and methods: Two typodont acrylic teeth models were prepared to receive

fixed dental prostheses with three different span lengths. Span 1: between maxillary

canines; span 2: between maxillary second premolars; and span 3: between maxillary

In recent years, the employment of digital techniques in

1–4

(CAD–CAM). Obtaining a digital scan using an intrao-

ral scanner (IOS) is the first step of this digital workflow.

This technique, when compared to traditional impression

techniques, has shown exceptional accuracy …

Fit Assessment Of Soft Milled Co-Cr And Zirconia Fixed Dental Prosthesis Compared To Cast Co-Cr., Elie E. Daou Prof

Annual Research Symposium

No abstract provided.

Evaluation Of Color Difference And Translucency Of Modified Peek Restorations Veneered With Different Veneering Materials Before And After Thermal Cycling, Mohamed Hamdy Abdulmaguied, Tarek Salah Morsi, Mennatallah M. Wahba, Hesham Katamish

Future Dental Journal

Objective: The aim of this study was to investigate the effect of different PEEK veneering materials, as well as thermocycling on the color difference (ΔE) and the translucency parameter (TP) of modified PEEK veneered restorations.

Materials and Methods: Thirty disc shaped specimens of veneered BioHPP (1.5 mm X 12 mm) were randomly divided into three groups (n=10) based on the type of the veneering material. Group (A): Discs veneered with CAD milled Lithium Disilicate, group (B): Discs veneered with pre-cured milled composite, and group (C): Discs veneered with conventional light cured composite. CIELab values were calculated for all specimens over …

Effect Of Chromium Metal Alloy Fabrication Techniques On Enamel Wear, Pattrapond Eopsirisuk

Chulalongkorn University Theses and Dissertations (Chula ETD)

This in vitro study aimed to investigate the effect of different chromium metal alloys on enamel wear through longitudinal observation across various simulated chewing cycles. Four groups of alloys were studied (n=10 per group): casting Ni-Cr alloys (NC), casting Co-Cr alloys (CC), SLM Co-Cr alloys (CS), and heat-treated SLM Co-Cr alloys (CS-H). The test simulated chewing of enamel cusps against the alloys in distilled water under specific conditions (49 N load, 0.7 mm sliding movement, and 1.6 Hz frequency). Enamel wear was measured at 60,000, 120,000, and 240,000 cycles by using intraoral scanner matching with open-source 3D software. Enamel wear …

ผลของการปรับสภาพพื้นผิวต่อกำลังแรงยึดเฉือนระหว่างวัสดุครอบฟันชั่วคราวกับแบร็กเกตจัดฟันโลหะ, มนนภัส เลาหะอัญญา

Chulalongkorn University Theses and Dissertations (Chula ETD)

งานวิจัยมีวัตถุประสงค์เพื่อเปรียบเทียบกําลังแรงยึดเฉือนระหว่างแบร็กเกตจัดฟันโลหะกับครอบฟันชั่วคราวชนิดต่าง ๆ ที่ใช้การปรับสภาพพื้นผิวที่แตกต่างกัน เตรียมวัสดุบูรณะครอบฟันชั่วคราว 3 ชนิด ได้แก่ พอลิเมทิลเมทาคริเลตชนิดบ่มด้วยตัวเอง (Unifast™ Trad) พอลิเมทิลเมทาคริเลตชนิดแคดแคม (CADCAM VIPI Block) และเรซินคอมโพสิตชนิดบิสเอคริล (Protemp™ 4) จำนวน 4 กลุ่ม กลุ่มละ 11 ชิ้น นำวัสดุปรับสภาพพื้นผิวด้วยการทามอนอเมอร์เมทิลเมทาคริเลต การเป่าผงอะลูมินัมออกไซด์ การใช้เข็มกรอกากเพชร และกลุ่มที่ไม่ได้ถูกปรับสภาพพื้นผิวเป็นกลุ่มควบคุม นำชิ้นงานตรวจความหยาบของพื้นผิวและส่องด้วยกล้องจุลทรรศน์อิเล็กตรอนแบบส่องกราด ทำการยึดติดแบร็กเกตจัดฟันโลหะด้วยเรซินแอดฮีซีฟทรานสบอนด์ เอ็กซ์ที นำไปทดสอบค่ากำลังแรงยึดเฉือนด้วยเครื่องทดสอบอเนกประสงค์โดยใช้ความเร็วในการทดสอบที่ 1 มิลลิเมตรต่อนาที ศึกษาดัชนีส่วนเหลือของสารยึดติดด้วยกล้องจุลทรรศน์ชนิดสเตอริโอ วิเคราะห์ด้วยสถิติการวิเคราะห์ความแปรปรวนแบบสองทางที่ระดับนัยสําคัญ 0.05 และเปรียบเทียบแต่ละกลุ่มโดยใช้สถิติ Games-Howell test ผลการศึกษาพบว่าวัสดุบิสเอคริลการเป่าผงอะลูมินัมออกไซด์มีค่ากำลังแรงยึดเฉือนสูงที่สุด ตามมาด้วยการใช้เข็มกรอกากเพชร และการทามอนอเมอร์ ตามลำดับ วัสดุพอลิเมทิลเมทาคริเลตชนิดแคดแคมการเป่าผงอะลูมินัมออกไซด์มีค่ากำลังแรงยึดเฉือนสูงที่สุด ตามด้วยการทามอนอเมอร์ และการใช้เข็มกรอกากเพชร ตามลำดับ และวัสดุพอลิเมทิลเมทาคริเลตชนิดบ่มด้วยตัวเองการทามอนอเมอร์และการเป่าผงอะลูมินัมออกไซด์ มีค่ากำลังแรงยึดเฉือนสูงที่สุดโดยไม่แตกต่างกันอย่างมีนัยสำคัญทางสถิติ ตามด้วยการใช้เข็มกรอกากเพชร ดังนั้นการปรับสภาพพื้นผิวด้วยการเป่าผงอะลูมินัมออกไซด์มีประสิทธิภาพในการเพิ่มแรงยึดติดแบร็กเกตจัดฟันมากที่สุด ในพอลิเมทิลเมทาคริเลตชนิดบ่มด้วยตัวเองควรทามอนอเมอร์เมทิลเมทาคริเลตเพิ่มเติม และวัสดุบิสเอคริลมีแรงยึดติดกับแบร็กเกตจัดฟันมากที่สุดหลังปรับสภาพพื้นผิวเชิงกล

Effect Of Aprotic Solvents On The Microtensile Bond Strength Of Composite Core And Fiber-Reinforced Composite Posts, Wisarut Prawatvatchara

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: The purpose of this study was to examine the effect of aprotic solvents, which were tetrahydrofuran, pyridine, and morpholine, compared to hydrogen peroxide on surface roughness of fiber-reinforced composite post and microtensile bond strength between fiber-reinforced composite post surfaces and the composite core. Material and methods: A total of 75 FRC posts plus, and 75 D.T. light posts were divided into 3 groups (non-thermocycling, 5,000-cycle and 10,000cycle thermocycling groups). Each group was divided into five subgroups according to the post-surface treatment: C: non-treatment group; H2O2: immersing with 35% hydrogen peroxide; THF: immersing with tetrahydrofuran; PY: immersing with pyridine; MP: …

The Effect Of Different Functional Monomer Of Zirconia Primer And Universal Adhesive On Shear Bond Strength Of Zirconia To Composite Resin Using Resin Cement, Pimchanok Pitakassawakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Zirconia has been increasing used due to its good mechanical properties but the study about the ability to bond to zirconia ceramic is still limited. The purpose of this study is to evaluate the bond strength of zirconia using MDP-containing zirconia primer and GPDM-containing universal adhesive. Twenty-one super-high translucent zirconia discs (Ceramil zolid fx White; AMANN GIRRBACH, Austria), 8.5 mm in diameter and 3.2 mm in thickness, were prepared. The specimens were divided into 3 groups (n=7) according to primer application, Group I: no primer application (control group), Group II: Z-Prime plus® (Bisco, Schaumburg, Illinois, USA) and Group III: Optibond …

Analysis Of Gene Expression And Histology Of Bone Regeneration Using Mrna Encoding Bone Morphogenetic Protein-2 In Rat Femur, Duangporn Yongyosrungrueng

Chulalongkorn University Theses and Dissertations (Chula ETD)

The quality of bone healing is an important factor in dental implant treatment. Currently, there is only limited research on using mRNA encoding BMP-2 to improve the quality and quantity of bone. This study aimed to evaluate the effectiveness of bone healing in rat femur defect after delivery of dPBS, rhBMP-2 and mRNA-encoding BMP-2 (BMP-2 mRNA-LNP). Histology approach was used to measure the quantity of newly formed bone. RT-qPCR was used to study gene expression levels of BMP-2, OCN, BSP and TNF-α. Subsequently, RNA-Seq analysis was performed at six weeks post-operation. Histological study revealed that BMP-2 mRNA-LNP group had significantly …

The Effect Of Different Self-Adhesive Resin Cements On Shear Bond Strength Of Hybrid Ceramic And Dentin, Rattawich Hoonsuwan

Chulalongkorn University Theses and Dissertations (Chula ETD)

ActivaTM bioactive is the first developed of dual cured, self-adhesive resin cement. For this in vitro study was to compare and evaluate the three differentsshear bond strength among ActivaTM bioactive, Maxcem EliteTM and RelyXTMU200 cement, when used as adhesive between CAD-CAM hybrid ceramic; Vita EnamicTM and dentin surface. The Vita EnamicTM block was designed and fabricated into forty-two discs shaped with CAD software. Forty-two extracted third maxillary molars was also collected. The all teeth were free of dental caries, restoration and cracked line were mounted vertically in the epoxy resin with exposedthe occlusal surface. Dentin surfaces were flatted surface by …

Micro-Computed Tomography And Mechanical Test Of Bone Regeneration Using Mrna Encoding Bone Morphogenetic Protein-2 With Implant Placement In Rat Femur, Kanoksiri Jriyasetapong

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research evaluates the effectiveness of a modified mRNA encoding bone morphogenetic protein-2 (m1Ψ-BMP-2 mRNA) with N1-methylpseudouridine modifications on bone regeneration and integration after implantation into rat femur defects. In the study, twelve femurs from six Sprague-Dawley rats underwent titanium wire insertation. These femur defects were then filled with either 5 μg of m1Ψ-BMP-2 mRNA, 15 μg of m1Ψ-BMP-2 mRNA, or Dulbecco's phosphate-buffered saline (dPBS) in a randomized manner (N=4 each group) Six weeks post-implantation, the rats were euthanized for evaluation using micro-computed tomography and a mechanical push-out test. The Micro-CT analysis focused on several parameters including total bone volume, …

Effect Of Different Implant Angulations And Insertion-Removal Cycles On The Retentive Force Of Locator And Locator R-Tx Attachments, Jidapha Tangtrongmit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to assess the implant of varying angulations and insertion-removal cycles on the retentive force of 2 denture attachments. The blocks were produced via 3D printing and divided into 2 groups: the LOCATOR attachment with orange retentive inserts and the LOCATOR R-Tx attachment with pink retentive inserts. Each group was divided into 3 subgroups based on implant angulation at 0-, 15-, and 30-degree implant angulation. The insertion-removal cycles were performed in 37 ±1°C deionized water using an INSTRON E1000 machine. Retentive force tests were conducted using a universal testing machine at baseline, after 270, 540, 810, 1080, 2160, …

Gene Expression Of Soft Tissue Covering Bone Grafted With Xenograft In Human, Atithan Termworasin

Chulalongkorn University Theses and Dissertations (Chula ETD)

Soft tissue is one of many factors that influence the esthetic success of dental implants. This study explores soft tissue reaction between soft tissue covering bone grafted with xenograft and soft tissue in normal healing by analyzing the levels of inflammatory cytokine including TNF-α, IL-6, IL-8 and NF-kB1. Soft tissues are collected after 4 to 6 months of healing and analyzed by reverse transcription quantitative polymerase chain reaction (RT-qPCR). The result shows that the relative gene expression of TNF-α, IL-6, IL-8, and NF-kB1 are not significantly different in soft tissue covering xenograft compared to the ones in soft tissue covering …

The Effect Of Surface Treatment And Types Of Translucent Monolithic Zirconia On The Shear Bond Strength Of Porcelain Repaired To Zirconia, Karnkanith Hansomwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

In the event of proximal contact loss in a zirconia crown on an implant, the zirconia crown can be modified by adding porcelain to recreate the proximal contact. This study investigated the shear bond strength between translucent zirconia (4Y-PSZ) and veneering porcelain compared to conventional zirconia (3Y-TZP). Zirconia substructures were treated with airborne-particle abrasion with Al2O3. The results of the shear bond strength test were analyzed by One-way ANOVA and post-hoc comparisons with Tukey’s honest significant difference (HSD) test. The shear bond strengthranged from 21.87 and 27.79 MPa. The failure mode was mixed failure in all groups. From the results, …

Geriatric Esthetics: A Comparison Of Prosthodontists, General Practitioners, And Laypeople's Perception, Rawinun Puangkaew

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study, we evaluated the esthetic perceptions of prosthodontists, general practitioners, and laypeople in elderly smile, using varying the exposure of the maxillary incisors in rest position and a full smile, size of buccal corridor and gingival display of maxillary posterior teeth. The picture of elderly smile was modified and shown with randomized sequence. Participants are asked to rate each image by using a numerical visual analog scale (0-10 scale). A total of 150 participants consisted of 50 Thai prosthodontists, 50 general practitioners, and 50 laypeople. Some pictures exhibited statistically significant differences (p0.05). All variation of incisal display were …

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 Digital Impression Techniques On The Trueness Of Post Space Scans With Fixed Cervical Diameter, Omar Elsergany

Dentistry

Objective: The aim of this study was to measure the trueness of post space impression by 2 digital impression techniques: Impression Scanning (IS) and Model Scanning (MS) with cervical diameter 3 millimeters. Materials and methods: Fourteen freshly extracted single rooted lower second premolars were endodontically treated using Wave-One single file technique. Then mounted in acrylic blocks parallel to long access using a dental surveyor 2mm above the CEJ, drills in sequence 1.4 and 1.6 millimeter then diamond stone with 3 millimeter diameter were used for teeth preparation with a standardized depth of 8mm. Teeth were scanned by reference scanner InEos5 …