Dentistry Commons^™

การพัฒนาวัสดุไตรแคลเซียมซิลิเกตที่ผลิตในประเทศไทยสำหรับใช้ในงานไวทัลพัลพ์เทอราพี, สลิลลา ลิขิตปรีดา

Chulalongkorn University Theses and Dissertations (Chula ETD)

การศึกษานี้มีวัตถุประสงค์เพื่อศึกษาคุณสมบัติทางกายภาพและทางเคมีของวัสดุปิดทับเนื้อเยื่อในไตรแคลเซียมซิลิเกตที่ผลิตจากเปลือกหอยแครง และเถ้าแกลบ (C-Cap) C-Cap ผลิตมาจากเปลือกหอยแครงและเถ้าแกลบ ร่วมกับมีการเติมสารเติมแต่งอื่นๆ C-Cap ประกอบด้วย 2 ส่วน ได้แก่ ส่วนผงและส่วนเหลว ส่วนผงประกอบด้วยผงไตรแคลเซียมซิลิเกตจากเปลือกหอยแครง เซอร์โคเนียมซิลิเกต และซิลิกอนไดออกไซด์ ส่วนเหลวประกอบด้วย เมทิลซาลิไซเลต และเอ็น-บิวทิล เบนซีน ซัลโฟนาไมด์ ในการศึกษานี้เลือกใช้วัสดุปิดทับเนื้อเยื่อในแคลเซียมไฮดรอกไซด์ที่มีจำหน่ายในปัจจุบัน ได้แก่ ยี่ห้อ Life และ Dycal® เพื่อนำมาศึกษาเปรียบเทียบคุณสมบัติทางกายภาพและทางเคมีกับ C-Cap การศึกษาคุณสมบัติทางกายภาพ ได้แก่ ระยะเวลาการแข็งตัว การไหลแผ่ การละลายตัว ความทึบรังสี อ้างอิงวิธีการและดัดแปลงมาจาก ไอเอสโอ 6876:2012 ศึกษาการปลดปล่อยแคลเซียมอิออนและความเป็นกรดด่างที่ระยะเวลาต่าง ๆ ภายหลังจาก C-Cap แข็งตัว ทำการตรวจคุณลักษณะเฉพาะของ C-Cap เมื่อสัมผัสกับน้ำ ด้วยเทคนิคการเลี้ยวเบนของรังสีเอ็กซ์และเทคนิคฟูเรียร์ทรานสฟอร์มอินฟราเรดสเปกโทรสโกปี ผลการศึกษาพบว่า C-Cap Dycal® และ Life มีระยะเวลาการแข็งตัวของวัสดุอยู่ในช่วง 1-2 นาที C-Cap มีการไหลแผ่สูงที่สุด การละลายตัวของวัสดุทั้ง 3 ชนิดไม่แตกต่างกันอย่างมีนัยสำคัญ ความทึบรังสีของ Dycal® Life และ C-Cap มีค่าเทียบเท่ากับ 2.87, 2.60, 2.43 มิลลิเมตรของอะลูมินัมตามลำดับ วัสดุทุกชนิดมีคุณสมบัติเป็นด่าง โดยพบว่า C-Cap มีความเป็นกรดด่างสูงที่สุดอยู่ในช่วง 9.9-10.5 และสามารถปลดปล่อยแคลเซียมอิออนสูงสุดเมื่อเปรียบเทียบกับวัสดุประเภทแคลเซียมไฮดรอกไซด์ ผลการวิเคราะห์ด้วยเทคนิคการเลี้ยวเบนของรังสีเอ็กซ์และเทคนิคฟูเรียร์ทรานสฟอร์มอินฟราเรดสเปกโทรสโกปี พบว่า C-Cap ที่สัมผัสกับน้ำจะพบแคลเซียมไฮดรอกไซด์ ซึ่งเป็นผลิตภัณฑ์ของไตรแคลเซียมซิลิเกตที่เกิดปฏิกริยาไฮเดรชัน

Comparison Of Fracture Resistance In Different Post Systems And Fabrication Techniques In Human Endodontically Treated Tooth, Anutara Bhaktikamala

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: to evaluate the fracture resistance and observe fracture mode of endodontically treated teeth restored with different post systems and fabrication techniques. Materials and Methods: Forty selected human mandibular premolars were divided into 4 groups (n=10) according to restoration after endodontic treatment: restored with prefabricated D.T. Light-Post (Group PDT), restored with D.T. Light-Post, relined with resin composite (Group ADT), restored with prefabricated Hi-Rem post (Group PHR), and restored with Hi-Rem post, relined with resin composite (Group AHR). Following cementation and core construction, specimens were loaded at a 45-degree angle in a universal testing machine until fracture. The fracture modes of …

Prevalence And Course Of Mandibular Incisive Canal In Thai Population Using Cone-Beam Computed Tomography, Wadee Sukontasing

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: To assess the prevalence and course of mandibular incisive canal in Thai population using cone-beam computed tomography. 149 CBCT images of the mandibles were obtained from 78 males (52.3%) and 71 females (47.7%) age ranged between 21 and 73 years. For the CBCT scan, the standard i-CAT settings were used. A digital ruler was incorporated into the viewing software for the purpose of taking measurements. Double measurements and observations were conducted by a single observer. Result: The mandibular incisive canal was identified in 90.60% of all the subject, 67 (85.89%) in males and 68 (95.77%) in females. The mean …

Aadej Comm 7 2 2021

AADEJ - The Communicator

The Communicator is the official journal of the American Association of Dental Editors and Journalists (AADEJ). It is published quarterly, distributed digitally via email to members, and posted on the Association's website, AADEJ.org. Each issue includes regular updates from the editorial team and AADEJ board, as well as feature articles on current issues in the field.

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 …

The Effect Of Different Drilling Protocols On Bone Healing Around Dental Implants., Sara Fikry, Amr Amin Ghanim, Hisham El Sheikh, Omar El Sergany

Dentistry

Materials and Methods: 20 patients with kennedy class III modification 1 edentulous areas were recruited for this study and divided into two groups; Control group received implants with conventional osteotomy preparation following standard drilling protocol (speed= 1200 rpm) with torque of 30N and sufficient saline irrigation, while Study group received implants with osteotomy preparation following a low speed drilling protocol (speed < 200 rpm) without irrigation and a torque of 50 N. Cone Beam CT was used to evaluate bone height and density around the implants at 3, 6 and 12 months after insertion. Implant primary stability was evaluated using Ostell by Resonance Frequency Analysis. Results The results showed no significant difference between bone height changes and densities in the control and study groups. Implants primary stability also showed no significant difference in ISQ values between both groups. Conclusion Biologic drilling is a promising implant drilling protocol with a potential to insert implants showing successful osseointegration and acceptable bone changes.

Evaluation Of Anti-Cancer Effect Of Different Concentrations Of Black Raspberries Extract On Oral Squamous Cell Carcinoma Cell Line (In Vitro Study), Sara Abdelwahed

Dentistry

Background: Black Raspberry has a wide range of pharmacological and therapeutic aspects including anti-inflammatory and antioxidant activities. Moreover, the effect of Black Raspberry has been studied in many cancers such as human cervical, esophageal and colorectal cancer and showed cytotoxic and anti-proliferative effects against these types of cancer. Aim: To identify the possible anti-cancer effect of Black Raspberry on Oral Squamous Cell Carcinoma cell line. Material and methods: Human tongue squamous cell carcinoma cell line was divided into 3 groups: one control group, second group treated with Black Raspberry, and the third group treated with Doxorubicin, each of the two …

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 …

Systemic Versus Local Injection Of Bone Marrow Mesenchymal Stem Cells On 5-Fluorouracil Treated Parotid Glands Of Albino Rats, Caroline Maged Massieh, Medhat El Zainy, Reham Magdy Amin, Iman Fathy

Dentistry

ABSTRACT Objective: Head and neck cancer is the sixth leading cancer by incidence worldwide and eighth by death. Recent reports revealed that, not only radiotherapy but also chemotherapy may induce xerostomia. The aim of this study was to compare the possible regenerative effect of BMSCs through systemic and local injections. Material and Methods: 52 male Albino rats were randomly divided into 4 groups: Group 1: 10 rats received 0.5 ml of PBS by injection. Group 2: 14 rats received an intraperitoneal injection of 5-FU drug. Group 3: 14 rats were injected the same dose of 5-FU then received an intraglandular …

In Vitro Evaluation Of Material Dependent Force Damping Behavior Of Implant-Supported Restorations Using Different Cad-Cam Materials And Luting Conditions, Ahmed Sabet

Dentistry

Statement of problem. Although force-damping behavior that matches natural teeth may be unobtainable, an optimal combination of crown material and luting agent might have a beneficial effect on the force absorption capacity of implant-supported restorations. However, the force-absorbing behavior of various restorative materials has not yet been satisfactorily investigated. Purpose. The purpose of this in vitro study was to evaluate the material dependent force-damping behavior of implant-supported crowns fabricated from different computer-aided design and computer-aided manufacturing (CAD-CAM) materials luted to implant abutments under different conditions. Material and methods. Titanium inserts (N=84) were screwed to implant analogs, scanned to design zirconia …

Effect Of Different Preparation Depths For An Inlay-Retained Fixed Partial Denture On The Accuracy Of Different Intraoral Scanners: An In Vitro Study, Ahmed Sabet

Dentistry

Purpose: The aim was to evaluate the effect of different preparation depths for inlayretained fixed partial dentures on the accuracy of intraoral scanners. Materials and Methods: Tooth preparations for two inlay-retained fixed partial dentures were done and divided according to depth of the preparation. Group A: 2 mm pulpal floor depth, 3 mm gingival floor depth and Group B: 3 mm pulpal floor depth, 4mm gingival floor depth. The CEREC Omnicam 4.4.4, Omnicam 4.6.2. Trios3 and Medit i500 intraoral scanners were used in this study. Tooth preparations were scanned by each scanner 10 times. The STL files obtained from the …

Accuracy And Repeatability Of Different Intraoral Instruments On Shade Determination Compared To Visual Shade Selection, Ahmed Sabet

Dentistry

Objective: To evaluate the accuracy and repeatability of intraoral instruments used for shade determination compared to visual shade selection (VSS). Materials and Methods: A total of 20 subjects and 10 observers, balanced by gender, participated in the study. Observers performed VSS of the upper right central incisor from each subject. Instrumental shade determination of the same teeth was performed using a spectrophotometer (Easyshade V) and intraoral scanners (CEREC Omnicam, Primescan, Trios 3 and Trios 4). Vita Classical shade nomenclature was used to record the shade designation for all instruments and VSS. The accuracy of the instruments was determined by comparing …

What Do Patients Use For Treating Their Oral Ulcers? And How Do These Treatments Affect Their Quality Of Life?, Enji Ahmed Mahmoud, Ayat Gamal Abdel-Nasser, Mai Zakaria, Sohair Gaafar

Dentistry

Objectives: Oral ulceration forms a major category of oral lesions. Due to its effect on the quality of life, the patients seek treatment using various substances. This study investigated the types of treatments used by a sample of patients having all types of oral ulcers and its positive and negative effects on the patients' lives. Methods: This cross-sectional study included patients having different types of oral ulcers. Participants provided information about their previous treatments, the source of recommendation of its use and side effects linked to them. They filled the oral health impact profile-14 questionnaire to report the change in …

Oral Mucormycosis In Post-Covid- 19 Patients: A Case Series, Enji Ahmed Mahmoud, Asmaa Abobakr, Radwa Raghib, Ayman El-Gawish, Dalia Galwash

Dentistry

No abstract provided.

Effect Of Locally Delivered Melatonin As An Adjunct To Nonsurgical Therapy On Gcf Antioxidant Capacity And Mmp-9 In Stage Ii Periodontitis Patients: A Randomized Controlled Clinical Trial, Enji Ahmed Mahmoud, Olfat Gamil Shaker, Nermin Youssif, Dalia Mohey-Eldien Ghalwash

Dentistry

Objectives. Periodontitis is characterized by inflammatory destruction of periodontal tissue, loss of attachment, and bone resorption. +e increase in reactive oxygen species (ROS) is responsible for the oxidative damage occurring in periodontal tissues. Melatonin has important immunomodulatory, anti-inflammatory, and powerful antioxidant functions. +e current study was carried out to evaluate the effect of topical melatonin gel as an adjunct to nonsurgical periodontal therapy. Methods. +is splitmouth randomized controlled clinical trial was performed on 24 patients with grade II periodontitis. Two sites in each patient were randomly assigned; test sites were treated by nonsurgical therapy followed by intrapocket application of 5% …

Assessment The Propolis Effect Versus Calcium Hydroxide Effect As Intracanal Medications On Post-Operative Pain In Necrotic Teeth, Engy M. Kataia

Dentistry

Aim: to evaluate the postoperative pain of using Propolis versus Calcium hydrox- ide as intracanal medications on post-operative pain in necrotic teeth. Subjects and Methods: 40 patients requiring endodontic treatment for single rooted teeth were en- rolled in this analysis. The selected patients were separated into two groups with 20 pa- tients each; Group І: Propolis paste. Group II: Ca (OH)2 paste. The local anesthesia was administrated, and the working length determined by Root ZX apex locator, and then confirmed radiographically. The root canals were mechanically prepared in a crown- down approach using the “TF Adaptive” setting on Elements Motor. …

Occupational Health Practices Among Dental Care Professionals Before And During The Covid-19 Pandemic, Sean Banaee, Denise M. Claiborne, Muge Akpinar-Elci

Community & Environmental Health Faculty Publications

BACKGROUND: The COVID-19 pandemic has posed a substantial burden on dental care professionals. While dentistry is known as one of the most exposed and high-risk professions, dental care professionals are indeed at even greater risk.

OBJECTIVE: The aim of this study was to assess knowledge, attitudes, occupational health practices, personal protective equipment usage, and mental stressors during COVID-19 pandemic among dental care professionals.

METHODS: A cross-sectional study was conducted among dental care professionals who were subscribers to a dental hygiene journal using a self-administered online survey (n = 1047 respondents). Cross-tabulations were performed to determine differences in the responses to …

Llusd Articulator - Volume 31, Number 2, Loma Linda University School Of Dentistry

Articulator (Dentistry)

Contents:

5 | Dean's Message
8 | Faculty arrive and faculty advance
10 | Mary Hartwell concludes 40 years
11 | LLUSD's 2020 virtual commencement
26 | Student research surmounts the virus
38 | The legacies left by
Dr. Donald Peters,
Dr. Doug Roberts, &
Dr. Elmer Kelln

S. Gordonii-Produced Hydrogen Peroxide Modulates Mir-663a And Ccl20 Expression In Oral Epithelial Cells, Marshall Houston Maynard

Theses and Dissertations--Medical Sciences

The mechanisms through which a persistent recognition of commensal bacteria by oral epithelial cells (OECs) mitigates an uncontrolled inflammatory response of the oral mucosa remain unknown. CCL20 secretion by OECs in response to pathogenic bacteria is regulated by S. gordonii (Sg)-induced miR-663a; nevertheless, the mechanisms involved in these Sg-modulated responses remain to be elucidated. Since Sg is a hydrogen peroxide (H₂O₂) producer, and H₂O₂ has been shown to stimulate miRNA expression, we hypothesized that H₂O₂ could be involved in Sg-induced miR663a and CCL20 responses. Expression of miR663a …