Prosthodontics and Prosthodontology Commons^™

Mucosa-Supported Stereolithographic Surgical Guide Versus Conventional Surgical Stent In Implant Supported Overdenture, Fardos N. Rizk, Marwa Sabet Prof., Shaimaa Azoz, Eman Gamal

Dentistry

Purpose: The aim of the study was to compare between the accuracy of mucosa-supported stereolithographic surgical guide versus conventional surgical stent in implant supported overdenture. Materials and methods: Twelve patients with completely edentulous patients were selected for this study and divided into three groups. Group (A): 8 implants were placed in the mandible using conventional surgical stents during implant insertion. Group (B): 8 implants were placed in the mandible using partially limiting mucosa-supported stereolithographic (SLA) surgical guide during implant insertion. Group (C): 8 implants were placed in the mandible using completely limiting mucosa-supported stereolithographic (SLA) surgical guide during implant insertion. …

Subjective And Objective Outcomes On Denture Adhesive Usage Among Complete Denture Wearers, Budsara Thongyoi

Chulalongkorn University Theses and Dissertations (Chula ETD)

The propose of this clinical study was to evaluate the subjective and objective assessment factors affecting decision of complete denture wearers to use or not use denture adhesive. Sixty-six fully edentulous using upper and lower conventional complete dentures (aged 53 to 83 years) were recruited in this study. (1) Condition of denture-supporting tissue (ACP classification), (2) denture quality (CU-modified kapur criteria), (3) patients' satisfaction in prostheses and (4) oral impact on daily performances (OIDP) were evaluated as baseline (T0). All participants were assigned to use denture adhesive (Polident®, Ireland) for 1 month period and made decision by themselves to continue …

The Synthesis, Modification And Application Of Silica Nanoparticles In Polymethyl Methacrylate Denture Base, Pornpot Jiangkongkho

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to investigate amount of γ-methacryloxypropyltrimethoxysilane (MPS) silanized on experimental nanosilica particles (NPs), amount of NPs and amount of MPS silanized NP on flexural strength (FS), flexural modulus (FM), and fracture toughness (FT) of NP reinforced polymethymethacrylate (PMMA). The chemisorbed amount of MPS was determined using elemental analysis. Six groups (n=8) were prepared with chemisorbed amount and mixed with PMMA-monomer to make 0.25, 0.5, 1, 5, 10 and 15% (w/w) of NP reinforced PMMA. PMMA without NP served as control. Seven groups (n=8) were prepared with 1% of NPs silanized with 0, 0.061, 0.123, 0.246, 0.493, 0.987, and …

Effect Of 3-Methacryloxypropyltrimethoxysilane Modified Zinc Oxide Nanoparticles Incorporated In Polymethylmethacrylate Material On Antifungal, Optical And Mechanical Properties, Krid Kamonkhantikul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to evaluate 1) the characteristics of different amount of 3-methacryloxypropyltrimethoxysilane (MPS) deposited on zinc oxide nanoparticles (ZnOnps) by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) before and after tetrahydrofuran washing, 2) the effect of different MPS amount deposited on ZnOnps incorporated in PMMA material on mechanical properties, and 3) the effect of different ZnOnps amounts with or without MPS incorporated in PMMA material on antifungal, optical and mechanical properties. The FTIR and TGA results showed the success of silanization. The monolayered silane molecules were parallelly oriented on the ZnOnps surface. The different MPS amounts (0-14.4 …

The Quality Of Complete Denture, Patient's Satisfaction, Oral Health-Related Quality Of Life, And Their Association, Nareudee Limpuangthip

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this study was to determine the association of complete denture quality, patient's satisfaction, and Oral Health-related Quality of Life (OHRQoL). A total of 126 complete denture wearers was interviewed for the primary outcome, OHRQoL, using Oral Impacts on Daily Performances (OIDP) index. Secondary outcomes were patient's satisfaction and masticatory performance. Denture retention and stability were scored following the conventional and Chulalongkorn University (CU)-modified Kapur criteria. Esthetic-assessment criteria was evaluated from patient's photographs. It was found that limited eating/chewing was the most common problem, and an ill-fitting denture was a primary cause of any reported problems. Unacceptable denture …

The Inflammatory Response Of Epithelial Cell To Corrosion Products From Recast Palladium -Silver Alloy, Verapol Singkarlsiri

Chulalongkorn University Theses and Dissertations (Chula ETD)

In dentistry, there is an increase in alternative metals such as palladium or silver to add into noble metal alloys in order to improve properties and reduce cost. Apart from using other metals to replace gold or platinum, reuse is another way to save the cost. There are many studies on the recast dental alloys on mechanical properties and how many percentages of new alloys needed to add in the recasting process. It has been well accepted that amount of new and used alloys would affect the mechanical and physical properties. The biocompatibility of the alloys, however, has not been …

อิทธิพลของการผนึกเนื้อฟันทันทีด้วยสารยึดติดเซลฟ์เอทช์ที่มีผลต่อการบ่มตัวของวัสดุพิมพ์ฟัน, เอกลักษณ์ หวังหงส์หิรัญ

Chulalongkorn University Theses and Dissertations (Chula ETD)

วัตถุประสงค์ เพื่อศึกษาผลของสารยึดติดที่ใช้ผนึกเนื้อฟันต่อการก่อตัวของวัสดุพิมพ์ฟัน วัสดุและวิธีการ ฟันกรามใหญ่ของมนุษย์ที่ปราศจากรอยผุ จำนวน ๒๒๕ ซี่ ฝังในท่อพลาสติกด้วยอะคริลิก โดยให้ตัวฟันโผล่ขึ้นมา ตัดด้านบดเคี้ยวออกในแนวตั้งฉากกับแกนฟันด้วยเครื่องตัดความเร็วต่ำจนเนื้อฟันเผยออก แบ่งฟันเป็น ๔ กลุ่ม กลุ่มละ ๕๕ ซี่ ตามชนิดของสารยึดติดที่ใช้ผนึกเนื้อฟัน ได้แก่ กลุ่มที่ ๑.ฟันที่เคลือบด้วยด้วยสารยึดติดเซลฟ์เอทช์ซีโนไฟฟ์พลัสและซิงเกิลบอนด์ยูนิเวอร์ซอลในสภาวะออกซิเจน กลุ่มที่ ๒.เนื้อฟันที่เคลือบสารยึดติดเซลฟ์เอทช์ทั้งสองชนิดอยู่ในสภาวะก๊าซไนโตรเจน กลุ่มที่ ๓.เนื้อฟันที่ไม่มีการเคลือบด้วยสารใด ๆ และกลุ่มที่ ๔.ฟันที่เคลือบด้วยสารยึดติดทั้งสองชนิดแล้วถูกเช็ดด้วยแอลกอฮอล์ โดยหลังทาด้วยสารยึดติดจะทำการบ่มด้วยแสง ที่ตามองเห็นจากเครื่องฉายแสง จากนั้นปิดทับด้วยวัสดุพิมพ์พอลิไวนิลไซลอกเซนกลุ่มละ ๑๐ ซี่ เมื่อปล่อยให้วัสดุพิมพ์ก่อตัว ๖ นาที นำวัสดุพิมพ์ออกเพื่อตรวจสอบการก่อตัวที่ผิวหน้าด้วยตาเปล่าและด้วยกล้องจุลทรรศน์ชนิดสเตอริโอ จากนั้นทดสอบด้วยวัสดุพิมพ์พอลิอีเทอร์โดยวิธีเดียวกัน นำส่วนชิ้นทดสอบที่เหลืออีกกลุ่มละ ๑๐ ชิ้น วัดค่าความเป็นกรดด่าง และอีกกลุ่มละ ๕ ชิ้น ไปวิเคราะห์หาธาตุที่ผิวหน้าด้วยกล้องอิเล็กตรอนส่องกราดฟังก์ชั่นอีดีเอ็มเอ็กซ์ ผลการศึกษา เนื้อฟันที่เคลือบสารยึดติดเซลฟ์เอทช์ทั้งสองชนิดมีค่าความเป็นกรดด่างใกล้เคียงกัน และร้อยละร้อยของวัสดุพิมพ์ด้านที่สัมผัสกับผิวหน้าของชิ้นทดสอบกลุ่มที่ ๑ และกลุ่มที่ ๒ ที่เคลือบด้วยสารยึดติดเซลฟ์เอทช์ซีโนไฟฟ์พลัสถูกยับยั้งการก่อตัว ขณะที่ผิวหน้าของวัสดุพิมพ์ด้านที่สัมผัสกับผิวหน้าชิ้นทดสอบกลุ่มที่ ๓ และกลุ่มที่ ๔ มีการก่อตัวสมบูรณ์ เมื่อดูด้วยตาเปล่าและด้วยกล้องจุลทรรศน์ชนิดสเตอริโอ ส่วนของการหาธาตุบนผิวฟันของทั้งสามกลุ่ม พบว่าผิวเนื้อฟันที่เคลือบด้วยสารยึดติดเซลฟ์เอทช์ซีโนไฟฟ์พลัสมีองค์ประกอบของธาตุซัลเฟอร์ขณะที่ผิวเนื้อฟันที่เคลือบด้วยสารยึดติดเซลฟ์เอทช์ซิงเกิลบอนด์ยูนิเวอร์ซอล และเนื้อฟันที่ไม่มีการเคลือบด้วยสารใด ๆ ไม่พบธาตุดังกล่าว สรุป สารยึดติดเซลฟ์เอทช์ซีโนไฟฟ์พลัสที่ผนึกผิวเนื้อฟันมีผลต่อการบ่มตัวของวัสดุพิมพ์พอลิไวนิลไซลอกเซน
คำสำคัญ: การผนึกเนื้อฟัน สารยึดติด พอลิไวนิลไซลอกเซน

การยึดอยู่ของสะพานฟันรูปแบบใหม่ที่กรอฟันน้อย ภายหลังได้รับแรงกระทำแบบเป็นวัฏจักร, รุจิรา ภัทรทิวานนท์

Chulalongkorn University Theses and Dissertations (Chula ETD)

การศึกษานี้มีวัตถุประสงค์เพื่อออกแบบสะพานฟันที่ยึดด้วยวัสดุเรซินชนิดกรอฟันน้อยในฟันหลังรูปแบบใหม่ โดยเปรียบเทียบการยึดอยู่ระหว่าง 3 รูปแบบที่แตกต่างกันภายหลังได้รับแรงกระทำแบบเป็นวัฏจักร โดยใช้ฟันมนุษย์ที่ได้รับการถอนจำนวน 60 ซี่ เป็นฟันกรามน้อย 30 ซี่ และฟันกรามแท้ 30 ซี่ นำฟันกรามน้อยและฟันกรามแท้อย่างละซี่ยึดเข้ากับอะคริลิกเรซินชนิดบ่มตัวด้วยตัวเองที่ระยะห่าง 11 มิลลิเมตรเพื่อจำลองการสูญเสียฟันกรามแท้ซี่ที่หนึ่ง แบ่งบล็อกฟันออกเป็น 3 กลุ่มๆ ละ 10 บล็อก ตามรูปแบบการออกแบบชิ้นงาน โดยกลุ่มที่ 1 ชิ้นงานเป็นส่วนพักนอกตัวฟันด้านบดเคี้ยวที่มีลักษณะเช่นเดียวกับออนเลย์ กลุ่มที่ 2 ชิ้นงานเป็นส่วนพักในตัวฟันด้านประชิดร่วมกับข้อต่อขยับได้ และกลุ่มที่ 3 ชิ้นงานเป็นส่วนพักในตัวฟันด้านประชิดร่วมกับข้อต่อขยับไม่ได้ ชิ้นงานทำด้วยโลหะผสมไร้สกุล ปรับสภาพพื้นผิวด้านในด้วยอะลูมินาขนาด 50 ไมโครเมตร และยึดด้วยเรซินซีเมนต์ชนิดซุปเปอร์บอนด์ซีแอนด์บี ทดสอบชิ้นตัวอย่างด้วยแรงกดในแนวตรงลงบนฟันหลักทั้ง 2 ซี่และฟันแขวน ด้วยแรงขนาด 50 – 800 นิวตัน ที่ความถี่ 4 รอบต่อวินาที จำนวน 2,500,000 รอบ ภายหลังทดสอบด้วยแรงกด ถ้าชิ้นงานไม่เกิดความล้มเหลวจะนำไปทดสอบด้วยแรงดึงขึ้นในแนวตรงจนกระทั่งเกิดความล้มเหลวของชิ้นงาน และประเมินความล้มเหลวที่เกิดขึ้นว่าเกิดที่ระดับใด ผลการทดสอบพบว่าชิ้นตัวอย่างของทุกกลุ่มอยู่รอดภายหลังทดสอบด้วยแรงกดแบบเป็นวัฏจักร เมื่อทดสอบด้วยแรงดึงพบว่าค่าเฉลี่ยแรงยึดของชิ้นงานทั้ง 3 กลุ่มมีความแตกต่างกันอย่างมีนัยสำคัญทางสถิติ (p<0.05) โดยกลุ่มที่ 3 มีค่าแรงยึดสูงที่สุดโดยเฉลี่ย 529.9 ± 86.2 นิวตัน รองลงมาคือกลุ่มที่ 1 ที่มีค่า 396.7 ± 73.2 นิวตัน และกลุ่มที่ 2 มีค่าต่ำที่สุดโดยเฉลี่ย 228.3 ± 52.5 นิวตัน โดยรูปแบบความล้มเหลวของชิ้นงานจะเกิดการหลุดบริเวณรอยต่อระหว่างชิ้นงานและเรซินซีเมนต์และ/หรือภายในเรซินซีเมนต์เป็นส่วนใหญ่ ผลการศึกษานี้แสดงให้เห็นว่าสะพานฟันหลังชนิดกรอฟันน้อยที่ชิ้นงานมีส่วนพักในตัวฟันด้านประชิดร่วมกับการใช้ข้อต่อขยับไม่ได้อาจส่งผลให้มีอายุการใช้งานที่ยาวนานกว่าชิ้นงานที่มีลักษณะเป็นส่วนพักนอกตัวฟันด้านบดเคี้ยวที่ใช้อยู่ในปัจจุบัน

Study Retention And Physical Properties Of Conventional And Microwave-Cured Acrylic Resin Complete Denture: An In-Vivo And In-Vitro Investigation, Fardos N. Rizk, Amany Elhadary

Dentistry

Aim: This study was two folded: an in-vivo study to compare the retentive properties of Lucitone conventional cured denture base resin and Nature-Cryl MC microwave cured denture base resin and an in-vitro study to compare the internal adaptation, fracture resistance, roughness, hardness and colour stability of these two materials and correlate the laboratory results with each other and with the clinical results. Materials and Methods: Twenty completely edentulous male patients received twenty complete dentures constructed from Lucitone conventional cured denture base resin. The retentive properties of the upper complete dentures were measured using force measurement gauge at one week, one …

Managing Peri-Implantitis, Namita Khandelwal

Dental Medicine Faculty Publications

This guide, used by MetLife for its dental continuing education program, focuses on the inflammatory pathology around dental implants. It outlines the risk factors and diagnostic criteria for peri-implantitis, an inflammatory process resulting in progressive loss of bone around the implant. The guide also provides treatment approaches for peri-implantitis, including surgical and non-surgical options.

Effect Of Two Different Maxillary Treatment Options On Supporting Structures Of Mini Implant Retained Mandibular Overdenture, Fardos N. Rizk

Dentistry

Objectives: This study was conducted to evaluate whether maxillary conventional complete denture or narrow diameter implant retained maxillary overdenture is more compatible on opposing crestal bone height surrounding mini implants retaining mandibular overdenture. Materials and Methods: Fourteen male completely edentulous patients received mandibular overdentures retained by four one piece mini implants with ERA attachments placed anterior to the mental foramen. Patients were randomly divided into two groups: Group I received opposing maxillary conventional complete denture and Group II received opposing maxillary overdenture retained by four one piece narrow diameter implants with ball attachments placed in the anterior maxilla. Once patients …

Wearing Complete Dental Prostheses - Effects On Perioral Morphology, Gregor F. Raschke, Philipp Eberl, Geoffrey A. Thompson, Arndt Guentsch, Andre Peisker, Stefan Schultze-Mosgau, Marta Gomez-Dammeier, Gabriel Djedovic, Ulrich M. Rieger, Florian Beuer

School of Dentistry Faculty Research and Publications

Background: To adequately perform rehabilitation of edentulous patients by a complete removable dental prosthesis (CRDP) is from basic interest to dentists to understand the morphologic changes caused by re-establishment of a physiologic jaw relationship. Anthropometric analyses of standardized frontal view and profile photographs may help elucidate such changes. Material and Methods: Photographs of 31 edentulous patients were compared in relaxed lip closure and after insertion of a CRDP in stable occlusion. 2232 anthropometric distances were raised. Eighteen anthropometric indices reflecting the perioral morphology and its integration in the vertical facial harmony were investigated. Results: The intercanthal – mouth width index …

Objective Evaluation Of Clinical Shade-Matching Outcomes., Erin Ballard

Electronic Theses and Dissertations

The purpose of this study was to objectively evaluate shade-matching outcomes within an academic institution. Using the Spectrophotometer, E was calculated between the reference shade: restoration shade () and restoration shade: prescription shade (). The t-test was used to determine if E maintained clinical acceptance at E: 3.7. Satisfaction with shade-match and need for objective measurement were surveyed using a Five Point Likert Scale. Correlational relationships were assessed via Pearson Correlation. Mean E values were above the acceptance value (pppp

Evaluation Of Die Trim Morphology Made By Cad/Cam Technology, Pratiksha Agrawal

Master's Theses (2009 -)

Purpose: The purpose of this vitro study was to evaluate the accuracy of the morphology of digitally trimmed dies in comparison with the subgingival contour of a prepared tooth to be restored with a single crown. Materials and Methods: 20 human extracted teeth, 10 incisors and 10 molars were disinfected, mounted on dentoforms. The teeth were prepared for a single all ceramic restoration. Digital impressions of the preparations were made using the 3M Lava COS. With the data, the SLA models were fabricated with removable dies. The prepared tooth and the corresponding dies were then compared with the Rhino software. …

Comparison Of Retention Between Milled And Conventional Denture Bases: A Clinical Study, Abdulaziz Abdullah Alhelal

Loma Linda University Electronic Theses, Dissertations & Projects

The advancement in dental material technology led to the improvement in the fabrication method of PMMA denture bases. Denture base adaptation can be influenced by the amount of polymerization shrinkage that occurs during the processing method of fabrication. CAD/CAM dentures milled from prepolymerized PMMA acrylic resin blocks theoretically have reduced or no polymerization shrinkage. There have been no clinical studies, to date, that have compared retention values between milled and conventionally processed denture bases. Therefore, the purpose of this study clinical study was to compare the retention values between conventional heat polymerized and digital milled maxillary denture bases.

Twenty patients …

Effects Of Microwave Irradiation On The Dimensional Stability Of Complete Denture Bases, Miguel Pappaterra

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Maintenance for complete dentures is a role that must be undertaken by the patient. It has been determined that two minutes of microwave irradiation at 650 Watts provides denture disinfection, and three minutes provide sterilization32,34. There is insufficient data on how this practice affects the long term dimensional stability of commonly used complete denture bases in the United States. Purpose: The purpose of this study was to perform an in-vitro investigation, testing and comparing the effects of microwave irradiation on the dimensional stability of three types of complete denture bases. Materials and Methods: An edentulous master cast with reference …

Comparison Of Digital Scanning And Polyvinyl Siloxane Impression Techniques By Dmd Students : Instructional Efficiency And Attitudes Toward Technology., Alexander M. Marti

Electronic Theses and Dissertations

The aim of this research was compare the ability of dental students to learn an digital scanner (3M LAVA) and material-based (PVS) impression techniques and to determine attitudes and preferences towards each. D2 dental students (n=25) were recruited and instructed on the use of 3M LAVA and PVS techniques using three pedagogic methods: 1) video lecture (P1), 2) investigator-led demonstration (P2), and 3) independent clinical exercise (P3). The amount of time for each pedagogic method was measured, averaged (± s.d.) and compared using Wilcoxon Signed-Ranks tests. A pre- and post-test was administered assessing their attitudes towards both techniques using a …

Comparative Study Of Retention Of Palate-Less Versus Complete Palatal Coverage Dentures Fitted With Zirconia Mucosal Inserts, Fardos N. Rizk

Dentistry

Objective: The purpose of this study is to compare the retention of palate-less versus complete palatal coverage dentures fitted with zirconia mucosal inserts. Materials and Methods: Fourteen male patients received upper complete dentures fitted with zirconia mucosal inserts. Half of the dentures were fabricated with complete palatal coverage (Group I) and the other half was palate-less (Group II).Retention was measured for all patients using force measurement gauge through six months follow-up period. Results: Both groups showed increase in denture retention through the follow-up period however, dentures with complete palatal coverage (Group 1) showed higher mean values of retention compared to …

Are Bone Turnover Markers And Vitamin D Levels Associated With Frequency Of Complete Denture Relines?, Shweta Puri

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: To compare groups of subjects with varying frequencies of complete denture relines in terms of their bone turnover markers; C-terminal Telopeptide (C-Tx), Osteocalcin (OCN) and Vitamin D (25 OH-Vit D) levels to determine the presence of and the degree of association between them.

METHODS: This study was designed as a cross-sectional study wherein a retrospective chart review of three hundred twenty four edentulous subjects with history of complete denture use for at least a year was performed to determine history and frequency of their complete denture relines. A total of 100 patients were enrolled. After consent was obtained, each …

Effect Of Diamond Bur And Root Canal Irrigants On Retention Of Fiber Posts, Rami Jekki

Loma Linda University Electronic Theses, Dissertations & Projects

Esthetic glass fiber-reinforced posts are being used more often. The most commonly reported complication associated with these posts is debonding. Dentine conditioning with solutions such as EDTA or MTAD results in removal of smear layer and might improve the retention of posts to root canal dentin. Therefore, the purpose of this study was to investigate the effect of cleansing the post space with MTAD or EDTA on the bond strength of glass fiber-reinforced posts, when a diamond roughening instrument is used prior to cementation with self-adhesive resin cement. Forty-five (n=15) extracted human premolar teeth were sectioned at the cemento-enamel junction …

Comparison Of Maxillary Anterior Teeth Width To Facial Dimensions Among Three Races, Ewa Parciak

Loma Linda University Electronic Theses, Dissertations & Projects

Dental esthetics and tooth proportions have become increasingly relevant in dentistry, as the cosmetic demands of patients increase. Determining the appropriate esthetic dimensions of the maxillary anterior teeth is an important aspect in fixed and removable prosthodontics. The proportion of facial structures and the relationship between facial measurements and natural teeth could provide additional guidance in selecting denture teeth as well as in determining ideal teeth size for fixed restorations. There have been many publications on this topic, however, the subjects in these studies have been mostly selected from the Caucasian race. With the increasing diversity of the American population …

Comparative Study Of Implant Stability And Bone Height Changes Among Different Implant Designs Retaining Partial Overdenture, Fardos N. Rizk

Dentistry

Objective: This study was conducted to assess the primary stability of Trabecular Metal Dental Implant and Tapered Screw Vent Implant to determine the appropriate time for their loading by lower partial overdenture and to follow up for one year the changes in implant stability and crestal bone height surrounding the implant after loading it. Materials and Methods: The study was performed on ten lower Kennedy class I partially edentulous male patients. Each patient received one implant at the second molar area in each side of the ridge, where Trabecular Metal Dental Implant was inserted in the left side of the …

Osseointegration Of Wrapped Dental Implants In Rabbits, Alex Whitehead

AUCTUS: The Journal of Undergraduate Research and Creative Scholarship

Edentulous patients (those lacking teeth) require one of two approaches to augmentation: inserting a vertical bone graft, or subperiosteally anchoring a device on which an implant can be attached. Bone grafts have had unpredictable results and can undergo resorption over time, compromising implant stability and success. As of the subperiosteal approach, current materials have not proven to directly integrate with the bone, in a process termed osseointegration. Therefore, we used additive manufacturing to create a Ti6Al4V alloy surface with a specific roughness to determine if it would be osseoinductive in a challenging rabbit model over six weeks.

Restorative Characteristics Of Intrapulpally Cracked Teeth, Charles M. Beavers

Theses and Dissertations

Cracked teeth have long presented a diagnostic challenge. Previous investigators have considered possible predictive factors, many of which revolve around the tooth’s restorative characteristics. Few have investigated the restorative status of teeth with cracks extending into the pulp chamber. The purpose of this investigation was to determine the prevalence of the different types of restorations present in intrapulpally cracked teeth and determine any other restorative factors that may aid in predicting the presence or extent of an intrapulpal crack. Intrapulpally cracked molars requiring endodontic therapy at the VCU Graduate Endodontic Practice were included in this study. For each tooth, the …

The Effect Of Root Canal Cleansing On The Retention Of Glass Fiber-Reinforced Posts, Faisal Dhaifallah Al-Qarni

Loma Linda University Electronic Theses, Dissertations & Projects

Esthetic glass fiber-reinforced posts are being used more often. The most commonly reported complication associated with these posts is debonding. Dentine conditioning with solutions such as EDTA or MTAD results in removal of smear layer and might improve the retention of posts to root canal dentin. Therefore, the purpose of this study was to investigate the effect of cleansing the post space with MTAD or EDTA on the bond strength of glass fiber-reinforced posts, when cemented with self-adhesive resin cement. Forty-five (n=15) extracted human premolar teeth were sectioned at the cemento-enamel junction to obtain root length of fifteen millimeters. Endodontic …

Radiographic Evaluation Of Accuracy Of Surgical Stent For Implant Placement In Knife Edge Posterior Mandibular Ridge In Cases Of Ridge Splitting, Fardos N. Rizk, Engy Abdelhamed

Dentistry

Aim: This study was conducted to evaluate the efficacy of using conventional surgical stents guided by cone beam computed tomography in determining the position and buccolingual inclination of implants placed in posterior mandibular knife edge ridge in cases of ridge splitting with and without bone grafting material. Materials and Methods: The study was conducted on sixteen implants placed bilaterally in posterior knife edge mandibular ridge of four patients, where each patient received four implants in the form of two in each side. Implants on the right side of the ridge were placed following ridge splitting and bone grafting (group A). …

Comparing The Vertical Misfit Of Casts Produced By Two Verification Jigs, Abdulaziz Saeed Alqahtani

Master's Theses (2009 -)

Purpose: To compare the dimensional accuracy between master casts fabricated with verification jigs made of acrylic resin and light cure Triad. Materials and Methods: 10 GC Pattern resin Pattern verifications jigs and 10 Triad gel verification jigs fabricated of a master cast of a mandibular model of 4 internal hex implants. A stone base was fabricated for each verification jig. One screw test was used to evaluate the vertical gap at the terminal abutment using a digital micrometer with an accuracy of 1μm to record the vertical gap for each sample. Results: Triad Gel group has the lowest average distortion …

Effect Of Two Different Attachments On The Supporting Structures And Masticatory Capacity Of Implant Retained Mandibular Overdenture, Fardos N. Rizk

Dentistry

Aim: This study was conducted to compare the effect of ball and socket attachment and GPS attachment in implant retained mandibular overdenture cases regarding changes in: crestal bone height and density surrounding implants, electromyographic activity of temporalis and masseter muscles and occlusal biting force. Materials and Methods: Following two stage surgical protocol twelve completely edentulous patients received two implants placed bilaterally in the canine region (24 implants) to retain mandibular overdenture. Four months following the surgery patients were randomly divided into two equal groups; Group-I received ball and socket attachment while Group-II received GPS attachment upon which mandibular overdentures were …

The Influence Of Vitamin D Metabolism On Gene Expression, Matrix Production And Mineralization During Osteoprecursor Cell-Based Bone Development, Shelley S. Mason, Sean S. Kohles, Shelley R. Winn, Randy D. Zelick

Biology Faculty Publications and Presentations

Background: Multipotential precursor cell lines derived from human bone marrow, capable of differentiating into cartilage or bone, may provide a useful tissue development model for studying the regulation and metabolism of putative growth and differentiation factors necessary for tissue regeneration. In mammals, the process of bone development depends on the proliferation and differentiation of osteoblast lineage cells, and the subsequent synthesis and mineralization of bone extracellular matrix (ECM). Vitamin D metabolites play a pivotal role in bone and mineral homeostasis, and are positive factors on bone development. Recently, it was demonstrated that a human-derived engineered osteoblast precursor cell line (OPC1), …

Comparison Of Occlusal Plane Orientation Obtained Using Five Facebow Systems, Thomas C. Maveli

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: An in vitro investigation analyzing the sagittal and coronal orientation of the occlusal plane using five different facebow transfer systems. MATERIALS AND METHODS: A phantom head containing a maxillary typodont (the control) was oriented so that Frankfort Horizontal Plane (FHP) corresponds with the horizon. The angle between the occlusal plane of the maxillary arch of the phantom head and the FHP was measured along the sagittal and coronal planes using a digital protractor. Fifteen Facebow records using each of 5 facebow transfer systems (the test groups) were made on the phantom head containing the maxillary typodont. Diagnostic casts of …