Medicine and Health Sciences Commons^™

Implant Overdenture Abutment Loosening Under Hyperbaric Conditions, Zana Jamal Al-Saloum

Graduate Theses, Dissertations, and Problem Reports

Objectives: To investigate the effect of various hyperbaric air pressures on the loosening of LOCATOR® (ZEST Anchors, LLC, Escondido, CA USA) overdenture abutments.

The pressure conditions tested are meant to simulate scuba diving conditions in edentulous patients that are restored with implant-retained tissue-supported overdentures. Another sub-goal of this study is to determine whether or not there is a difference in LOCATOR® loosening when the sample is exposed to six cycles/dives as opposed to one cycle/dive.

Methods: 36 ZimVie Tapered Screw Vent Implants with a 3.5mm diameter implant platform, and a 2.5mm diameter (and 1.5mm deep) internal hexagon were …

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: …

การปิดสีโดยใช้ชนิดเรซินคอมโพสิตและความหนาที่แตกต่างกัน, กชรัตน์ นันทเสน

Chulalongkorn University Theses and Dissertations (Chula ETD)

ความสวยงามในเรื่องสีของฟันเป็นสิ่งหนึ่งที่ผู้ป่วยให้ความสำคัญเมื่อมารับการรักษาทางทันตกรรม โดยการเปลี่ยนสีฟันด้วยสิ่งบูรณะฟันโดยตรง ซึ่งเป็นการบูรณะฟันโดยตรงในช่องปากโดยใช้เรซินคอมโพสิต เป็นทางเลือกในการรักษาที่มีความนิยมมากขึ้น เนื่องจากมีการทำอันตรายต่อฟันน้อยที่สุด แต่ความสามารถในการปิดสีของเรซินคอมโพสิตอาจมีความแตกต่างกันไปตามแต่ละชนิด ถ้าสามารถเลือกชนิดของเรซินคอมโพสิตที่ปิดสีได้ดีในความหนาที่น้อย ก็จะช่วยลดการสูญเสียโครงสร้างฟันได้ งานวิจัยนี้จึงมีวัตถุประสงค์เพื่อเปรียบเทียบสีภายหลังการบูรณะด้วยชนิดของเรซินคอมโพสิตที่แตกต่างกัน โดยการนำเรซินคอมโพสิต 3 ชนิด ได้แก่ เคลียร์ฟิลเอพีเอ็กซ์, เมต้าฟิลซีเอ็กซ์ และฟิลเท็คซีทูไฟว์ซีโร่ ที่มีความหนา 4 ระดับ ได้แก่ 0.5, 1, 1.5 และ 2 มิลลิเมตร มาเปรียบเทียบความสามารถในการปิดสี โดยวัดด้วยตามนุษย์และเครื่องสเปกโทรโฟโตมิเตอร์ และประเมินความแตกต่างโดยใช้การทดสอบแบบครัสคัล-วอลลิสและการวิเคราะห์ความแปรปรวนทางเดียว ผลการศึกษาพบความแตกต่างอย่างมีนัยสำคัญทางสถิติที่ระดับความเชื่อมั่นร้อยละ 95 ระหว่างกลุ่มเรซินคอมโพสิตและความหนาที่ต่างกัน กล่าวโดยสรุป เรซินคอมโพสิตชนิดเมต้าฟิลซีเอ็กซ์มีความสามารถในการปิดสีเข้มสุด A6 ได้ดีกว่าเรซินคอมโพสิตชนิดเคลียร์ฟิลเอพีเอ็กซ์และฟิลเท็คซีทูไฟว์ซีโร่ในทุกระดับความหนา โดยเรซินคอมโพสิตชนิดเมต้าฟิลซีเอ็กซ์ที่ความหนาประมาณ 1.5 – 2 มิลลิเมตร สามารถบูรณะฟันสี A6 ให้ได้สีฟันที่ระดับ A1

Effect Of Splinting Implant Scan Bodies Intraorally On The Trueness Of Complete Arch Digital Impressions: A Clinical Study, Kawther Mahmoud Ali

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The purpose of this study was to investigate the effect of splinting scan bodies intraorally on the trueness and scan time of implant digital impressions of the edentulous arch.

Materials and Methods: Nineteen edentulous jaws undergoing fixed complete denture treatment with a minimum of 4 implants were selected for this study. Verified master casts of the patients’ edentulous jaws were scanned with a desktop laboratory scanner and scan bodies to obtain a reference (control) scan for each patient. Intraoral scan bodies were hand tightened on all the implants in the edentulous arch and an intraoral scan was …

Peri-Implantitis Incidence And Effect Of Supportive Periodontal Therapy On Outcomes: Retrospective Cohort Study, Michael Ha

Theses and Dissertations

Purpose: Management of peri-implantitis is becoming an increasing component of dental practice. Dental implants can develop peri-implantitis lesions which occur in a non‐linear and accelerating pattern compared to a gradual periodontitis lesion. It is crucial to diagnose and treat this disease early, or ideally prevent it. Contemporary implants have a rough surface texture which is difficult to properly decontaminate as a crucial component for treatment prognosis. Evidence on the long-term effects of Periodontal implant maintenance therapy (PIMT) on implants is limited. This study aims to investigate the effect of periodontal maintenance on peri-implant tissue health.

Methods: A retrospective chart review …

Immediate Loading Of 4 Guided Implants Supporting A Maxillary Overdenture Using A Novaloc Retention System, Doheum Choi

Graduate Theses, Dissertations, and Problem Reports

The purpose of this study was to test the treatment concept of maxillary overdenture retained by four unsplinted implants placed using a flapless guided approach and immediate loading with Novaloc® attachments. Subjects with fully edentulous maxillae received 4 BLX implants (Roxolid®, SLActive®, 3.75mm diameter, Institut Straumann AG, Basel, Switzerland) to support an immediately loaded overdenture. Implants were connected with Novaloc® attachments (Institut Straumann AG, Basel, Switzerland) immediately following surgery if insertion torque (IT) reached 20 N/cm or above. The primary outcome variable was the radiographic bone level change at 6- and 12-months following implant placement. Secondary outcome variables were peri-implant …

ความสัมพันธ์ระหว่างสภาวะสุขภาพช่องปากและผลของการฟื้นฟูสมรรถภาพของผู้ป่วยโรคหลอดเลือดสมอง, ปัทมาภรณ์ พุ่มเกาะ

Chulalongkorn University Theses and Dissertations (Chula ETD)

วิทยานิพนธ์ฉบับมีวัตถุประสงค์เพื่อศึกษาความสัมพันธ์ระหว่างสภาวะสุขภาพช่องปากและผลของการฟื้นฟูสมรรถภาพของผู้ป่วยโรคหลอดเลือดสมองที่โรงพยาบาลจุฬาลงกรณ์ สภากาชาดไทย มีผู้ป่วยโรคหลอดเลือดสมองระยะฟื้นฟูที่กลับมาติดตามอาการในช่วง 3 เดือน ยินยอมเข้าร่วมโครงการวิจัยทั้งสิ้น 86 ราย ผู้ป่วยโรคหลอดเลือดสมองจะได้รับการตรวจสภาวะสุขภาพช่องปาก ทำการสัมภาษณ์ข้อมูลทั่วไป ร่วมกับการเก็บข้อมูลในเวชระเบียนของผู้ป่วย ใช้สถิติเชิงพรรณนาอธิบายลักษณะของผู้ป่วยโรคหลอดเลือดสมอง และใช้สถิติสหสัมพันธ์แบบเพียร์สันและสเปียร์แมนวิเคราะห์ความสัมพันธ์ระหว่างสภาวะสุขภาพช่องปากกับผลของการฟื้นฟูสมรรถภาพของผู้ป่วยโรคหลอดเลือดสมอง ที่ระดับนัยสำคัญ 0.05 สภาวะสุขภาพช่องปากประเมินจากจำนวนฟันธรรมชาติที่เหลืออยู่ จำนวนคู่สบฟันหลังและคะแนนแบบประเมินสภาวะสุขภาพช่องปากและฟันเทียมฉบับดัดแปลง ผลของการฟื้นฟูสมรรถภาพของผู้ป่วยโรคหลอดเลือดสมองจะประเมินจากการเปลี่ยนแปลงของคะแนนค่าความรุนแรงของโรคหลอดเลือดสมอง ผลการวิจัยพบว่าจำนวนฟันธรรมชาติที่เหลืออยู่และจำนวนคู่สบฟันหลังมีความสัมพันธ์อย่างมีนัยสำคัญทางสถิติกับผลของการฟื้นฟูสมรรถภาพของผู้ป่วยโรคหลอดเลือดสมองพบความสัมพันธ์เป็นแบบสหสัมพันธ์เชิงลบ สรุปผลการวิจัย จำนวนฟันธรรมชาติที่เหลืออยู่และจำนวนคู่สบฟันหลังมีความสัมพันธ์กับผลของการฟื้นฟูสมรรถภาพของผู้ป่วยโรคหลอดเลือดสมองโดยพบความสัมพันธ์มีทิศทางตรงกันข้าม ผู้ป่วยที่มีจำนวนฟันธรรมชาติและจำนวนคู่สบฟันหลังที่มากสัมพันธ์กับค่าความรุนแรงของโรคหลอดเลือดสมองตอนผู้ป่วยออกจากโรงพยาบาลที่มีค่าความรุนแรงน้อยกว่า ผู้ป่วยจึงมีอาการเริ่มต้นไม่รุนแรงส่งผลให้มีการเปลี่ยนแปลงความรุนแรงของโรคน้อยกว่า การดูแลสภาวะสุขภาพช่องปากให้อยู่ในสภาพดีและการเก็บรักษาฟันธรรมชาติสภาพดีไว้ให้ได้มากที่สุดอาจจะเป็นปัจจัยร่วมปัจจัยหนึ่งในการลดความเสี่ยงความรุนแรงของโรคหลอดเลือดสมอง

Influence Of Cad/Cam Materials On Damping Behavior Of Implant-Supported Crown, Charnikan Sukkasam

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study was to investigate the damping capacity of implant-supported crowns made from various computer-aided design and computer-aided manufacturing (CAD-CAM) restorative materials. A titanium implant fixture was embedded in epoxy resin. Crown specimens were divided into three groups: Zirconia (Z), Lithium disilicate (E), and Polymethyl methacrylate (P). Each crown was subdivided into Uncement (Un) and Adhesive resin cement (RC) subgroups (n=5). Specimens were loaded (0-200N). Strain gauges were attached to measure microstrains at crestal and apical levels. Damping capacity was determined based on load-time curves, microstrain-time curves, and time required to reach the maximum load. A two-way ANOVA with Tukey …

The Novel Cyanoacrylate Based Fluoride Varnish, Narongrit Larpbunphol

Chulalongkorn University Theses and Dissertations (Chula ETD)

The important factors contributing to the effectiveness of fluoride varnish are the amount of fluoride ion release and the retention time of the varnish on the tooth surface. Commercial fluoride varnishes are susceptible to mechanical removal; therefore, patients are informed to avoid eating for a few hours and refrain from tooth brushing for 12–24 h, which results in patient inconvenience. However, the novel cyanoacrylate based fluoride varnish would not have these disadvantages. This study compared the daily fluoride ion release, abrasion resistance to brushing, and toxicity to human gingival fibroblasts (hGFs) between a newly-developed cyanoacrylate based fluoride varnish and Duraphat …

Comparison Of Compressive Strength Between Two Mini Implants :An In Vitro Study, Anchisa Weerasubpong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: To observe and evaluate the difference in static and dynamic loadings between two mini-implant systems (RetenDent and MS denture® system, OSSTEM). Materials and Methods: Fifty mini-implant from two companies were included in the study. The compressive force was applied to the mini-implants at 30 degrees from its vertical axis. Ten specimens from each group were subjected to static load tests. Subsequently, five cyclic loadings were calculated from static compressive strength. These loads include 320N, 275N, 230N, 185N, and 140N. Three specimens from each group were randomly selected and tested at each loading condition. The Independent T- test was utilized …

Accuracy, Prosthetic Outcomes, And Patient-Related Outcomes With Immediate Loading Of 4-Guided Implants Supporting An Unsplinted Maxillary Implant-Retained Overdenture, Nathaniel Chertok

Graduate Theses, Dissertations, and Problem Reports

Aim: Assess the accuracy of implant placement using a mucosa-supported surgical guide relative to the planned implant position and examine patient-related outcomes associated with immediately-loaded Mx IOD using a single-attachment abutment system. The secondary aim of the study is to examine the prosthetic complications associated with this treatment.

Materials and methods: Fifteen individuals with edentulous maxillae were included. Each participant received 4 Straumann BLX implants through a stereolithic mucosa-supported surgical guide distributed in the Mx arch to maximize AP spread. Implant lengths ranged from 10 to 14 mm. A post-op CBCT was taken after the surgery to compare …

Comparison Of Implant-Retained Overdenture And Conventional Complete Denture In The Edentulous Mandible: A Survey Study To Measure Patients' Satisfaction And Quality Of Life In Dental School Clinical Environment, Ahmad Kutkut

Theses and Dissertations--Clinical and Translational Science

Patient satisfaction and quality of life are integral parts of assessing the quality of oral health care. Current aging population trends suggest a growing need to understand the effects of edentulism on oral health and quality of life. As the proportion of aged Americans expands, there will be an increased need to understand treatment options and patient communication strategies. In addition, as new treatment options and innovative technologies emerge, it will be essential to understand patients' concerns and identify best practices associated with denture treatments' individual fit and function. Advanced denture treatments can now be fabricated using CAD/CAM digital denture …

Antifungal, Physical, And Mechanical Properties Of Tissue Conditioner Incorporated With Zinc Oxide Nanoparticles, Woraporn Homsiang

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study evaluated the antifungal, physical, and mechanical properties of tissue conditioner incorporated with different amounts of zinc oxide nanoparticles (ZnOnps) at different storage times (0, 7, and 14 days). Specimens of 0, 5, 10, 15 wt% ZnOnps, or 15 wt% nystatin incorporated into tissue conditioner were fabricated. The direct contact test (n=6) was performed to evaluate the antifungal effect against C. albicans suspension. Scanning electron microscopy and energy dispersive X-ray spectroscopy (n=6) were used to observe the amount and distribution of superficial zinc element. The penetration depth (n=6) and tensile bond strength (n=8) were evaluated following ISO 13139. The …

การเปรียบเทียบสมบัติเชิงกลของซิลิโคนอีลาสโตเมอร์ในงานบูรณะใบหน้าและขากรรไกร ก่อนและหลังได้รับพลังงานไมโครเวฟ, เพ็ญชนก แสนทวีสุข

Chulalongkorn University Theses and Dissertations (Chula ETD)

วัตถุประสงค์ของงานวิจัยเพื่อศึกษาสมบัติเชิงกลของซิลิโคนอีลาสโตเมอร์ในงานประดิษฐ์ ใบหน้าและขากรรไกรชนิด VST-50 และ M511 ที ่ใส่เม็ดสีและไม่ใส่เม็ดสี ก่อนและหลังได้รับการ แช่ในน้ำที ่ทำให้ร้อนด้วยพลังงานจากเตาไมโครเวฟโดยจำลองการใช้เตาไมโครเวฟ 18 เดือน ชิ ้นงานตัวอย่าง 80 ชิ ้นต่อซิลิโคนแต่ละชนิด ทั ้งหมด 160 ชิ ้น จัดเป็น 2 กลุ ่มตามการเติมเม็ดสีคือ ชิ ้นงานที ่ไม่มีสีและชิ ้นงานมีสี โดยเป็นเม็ดสีชนิดซิลิโคน และแบ่งออกเป็นกลุ ่มควบคุมและกลุ ่มเข้า เตาไมโครเวฟ รูปร่างชิ ้นงานถูกขึ ้นรูปตามมาตรฐาน ASTM D412 และ D624 ทั ้งหมดมี 8 กลุ่ม ย่อย (n=10) ต่อซิลิโคนแต่ละชนิด การนำชิ ้นงานเข้าไมโครเวฟร่วมกับการแช่น้ำ เป็นเวลา 6 นาที ที่ 660 วัตต์ 18 ครั ้ง เป็นการจำลองการใช้งานเดือนละ 1 ครั ้ง อุณหภูมิของน้ำภายหลังการเข้า ไมโครเวฟคือ 60 องศาเซลเซียส จากการวิเคราะห์ความแปรปรวนแบบ 2 ทาง (a=.5) พบว่า ซิลิโคน VST-50 ชนิดของเม็ดสีมีผลต่อความทนต่อแรงดึงและความแข็งของชิ ้นงานซิลิโคนอย่างมี นัยสำคัญทางสถิติ (P<.001) ทั ้งกลุ ่มควบคุมและเข้าเตาไมโครเวฟ ขณะที ่การใช้เตาไมโครเวฟมีผล ต่อความทนต่อการฉีกขาดอย่างมีนัยสำคัญทางสถิติ (P<.05) ทั ้งกลุ ่มไม่มีสีและมีสี และทั ้งสอง ปัจจัยไม่มีผลต่อร้อยละการยืดตัว ขณะที ่ซิลิโคน M511 มีปฏิสัมพันธ์กันระหว่างปัจจัยการผสมเม็ด สีและการเข้าไมโครเวฟอย่างมีนัยสำคัญทางสถิติสำหรับความแข็ง (P<.05)

The Efficacy Of Universal Ceramic Polishing Kit On The Surface Roughness Of Various Ceramic Types, Ekaluck Poosanthanasarn

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this vitro study was to determine the effect of polishing performance of a universal ceramic polishing kit on the surface roughness of various ceramics. The ceramic specimen size 5 x 7 x 4 mm of lithium disilicate glass ceramic (IPS e.max CAD, Ivoclar Vivadent, Liechtenstein), translucent zirconia (VITA YZ XT, VITA Zahnfabrik, Germany) and zirconia-reinforced lithium silicate (Celtra Duo, Dentsply Sirona, United States) (n=8) were fixed with clear resin in PVC block, 14 mm in diameter. The specimens were ground with fine diamond bur for 15 seconds to simulate clinical gross contouring.The two-step polishing process started with …

The Effects Of The Oral Exercises On The Oral Function Of People With Dementia, Kwanrutai Somsak

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this study was to examine the effects of the home-based oral exercises on the oral function in people with mild to moderate dementia. The patients with mild to moderate dementia at King Chulalongkorn Memorial Hospital, who were randomly allocated to an experimental group (n = 11), were asked to perform 3 home-based oral exercises for 3 months while those in a control group (n = 11) did not do any oral exercises. The oral function including maximum tongue pressure (MTP), oral diadochokinesis (ODK) rates of /ta/, /ka/, /pa/, swallowing function (modified water swallowing test: MWST), and oral …

Accuracy Of Digital Impressions At Varying Implant Depths: An In-Vitro Study, Vivia Sequeira

Graduate Theses, Dissertations, and Problem Reports

Introduction: Implants placed at variable depths may vary the amount of visible scannable surface of a scan body. Intraoral scanner technology uses advanced optical principles to record the surface of the scan body to accurately capture the implant position.

Purpose: To investigate the effect implant placement depth has on the accuracy of digital implant impressions using an intraoral scanner.

Materials & Methods: A partially edentulous gypsum master model was fabricated to allow the positioning of a single implant analog at different depths. Four groups based on the planned implant depths of 0, 3, 6 and 7mm and corresponding visibility of …

Accuracy Of Implant Placement Utilizing Stereolithographic Guides Printed With And Without Cross-Arch Stabilization Struts, Caitlin Libby Dds

Graduate Theses, Dissertations, and Problem Reports

Objectives: The purpose of this study was to assess the accuracy of implant placement using stereolithographic guides printed with and without stabilization struts by comparing the post-operative position to the planned implant position.

Methods: A pre-operative cone-beam computed tomography (CBCT) of a drillable maxillary model was obtained and data was uploaded into coDiagnostiX for preoperative planning. The implant position was planned in an edentulous space of #5 using a 3.3x10mm Bone Level Tapered (BLT) implant (Straumann). Ten surgical guides were designed utilizing a stabilization strut (Group A), while ten guides were designed without the stabilization strut (Group B). Twenty guides …

Effect Of Nanofiller Coating And Loading On Facial Elastomer Physical Properties, Rahmi K. Aulia

Theses & Dissertations

Current materials used for facial prostheses are far from being desirable, and improved properties with “skin-like” feel are needed. This study evaluates property changes induced by sequential additions of uncoated and hydrophobic-coated nano-SiO₂ to polydimethylsiloxane (PDMS) and compares them with those measured for conventional submicron SiO₂-filled materials. Each filler type was sequentially added to vinyl-terminated PDMS at 0%, 0.5%, 5%, 10%, and 15% by weight. Tensile, tear, Durometer hardness, translucency and viscoelastic properties were evaluated, with hardness and translucency also evaluated following 3000 hours of outdoor weathering. Results demonstrated that 15% coated nano-SiO₂-filled PDMS materials …

Metal Additive Manufacturing For Fixed Dental Prostheses, Mai El Najjar

Electronic Thesis and Dissertation Repository

The use of additive manufacturing (AM) in dentistry has gained momentum in recent years. However, high initial costs and uncertainty surrounding the quality of AM products are considered barriers to their use. This research compared dental substructures fabricated by AM versus conventional casting and milling.

Cobalt-chromium alloy rectangular bars and three-unit bridge substructures were fabricated by AM, casting or milling. Bars manufactured by AM exhibited superior flexural strength, shear bond strength of porcelain coating, and Vickers hardness. Bridge substructures fabricated by AM showed similar flexural stiffness to cast, similar flexural loads at failure to milled and cast, and overall accuracy …

Accuracy Of Blx And Blt Guided Implants In The Edentulous Maxilla: An In Vivo Study, Benjamin Andrew Kordusky

Graduate Theses, Dissertations, and Problem Reports

Objectives: To determine the accuracy of dental implants placed using a dual scan CBCT protocol with a SLA 3D printed mucosa supported surgical guide using a flapless surgical approach with regard to sleeve position, type of implant, and regional location in the maxillary arch.

Methods: Nine patients received 4 dental implants utilizing a fully guided, flapless approach with a mucosa supported SLA surgical guide with 3 fixation pins. Implants were immediately loaded using an attachment placed in an existing Maxillary complete denture. Accuracy of implant positions were evaluated by the Treatment Evaluation module of coDiagnostiX (DentalWings, Montreal, Canada). Statistical analysis …

The Visual And Spectrophotometric Effect Of External Bleaching On Omnichroma Resin Composite And Natural Teeth, Michael Brian Evans

Graduate Theses, Dissertations, and Problem Reports

Objective: To determine the visual and spectrophotometric effect external tooth bleaching has on natural tooth structure and OMNiCHROMA composite at various number of treatments. Variables were compared to determine if there is a detectable difference between the composite and the tooth before and after bleaching.

Methods: Preparation and restoration of 25 previously extracted teeth was completed. OMNiCHROMA composite was used. Each tooth was measured visually with a VITA shade guide and a colorimeter. Measurements were recorded before bleaching, after 5 and 10 treatments. Statistical analysis was completed and ΔE values between the composite and tooth were compared between the 3 …

Exploring The Use Of Pulsed Erbium Lasers To Retrieve A Zirconia Crown From A Zirconia Implant Abutment, Ahmed Elkharashi

Theses and Dissertations

Removal of zirconia crowns, commonly used as cement-retained implant fixed restorations, can be challenging. Conventional methods of crown removal are time consuming and often leave irreparable damage to the crown, which can be costly to patients and practitioners. This research explored the use of two different types of pulsed erbium lasers, erbium-doped yttrium aluminum garnet laser (Er:YAG) and erbium, chromium-doped yttrium, scandium, gallium and garnet (Er,Cr:YSGG), as non-invasive tools to retrieve cemented zirconia crowns from zirconia implant abutments. Times needed to remove the crowns were recorded and analyzed using ANOVA (��=0.05). No statistical differences between the debond times of each …

Effect Of Different Surface Treatments On The Shear Bond Strength Between Lithium Disilicate Glass-Ceramic And Resin Cement, Siripan Simasetha

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: The study aimed to evaluate the shear bond strength (SBS) of lithium disilicate glass-ceramic and resin cement using different surface treatments. Methods: Lithium disilicate blocks (Vintage LD Press ®) were prepared, etched with 4.5 % hydrofluoric acid, and randomly divided into seven groups (n=10), depending on the surface treatments: 1) no surface treatment (control), 2) Silane Primer (KS), 3) Signum® Ceramic Bond I (SGI), 4) Signum® Ceramic Bond II (SGI/SGII), 5) experimental silane (EXP), 6) experimental-silane/Signum® Ceramic Bond II (EXP/SGII), and 7) Experimental/Adper™ Scotchbond Multi-purpose Adhesive (EXP/ADP). The specimens were cemented to resin composite blocks with resin cement and …

Comparative Study Of Tensile Bond Strength Between Resin Cements And Hybrid Materials, Chakriya Donpinprai

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: To compare tensile bond strength among the hybrid materials (VITA ENAMIC®, SHOFU Block HC, Katana AVENCIA and Experimental material) using two primers (Universal ceramic primer and RelyX ceramic primer) and two resin cements (Super-Bond C&B and RelyXTM U200). Methods: Twenty blocks of 4×4×1 mm3 were prepared from each material type. In VITA ENAMIC® group, specimens were conditioned with 5% Hydrofluoric acid and primer. In SHOFU Block HC and Katana AVENCIA groups, specimens were treated with 50µm alumina and primer. In experimental material, specimens were etched with 65% Phosphoric acid. Ten specimens were randomly assigned to each group for different …

Effect Of Deep Margin Elevation With Resin Composite And Resin-Modified Glass Ionomer On Marginal Sealing Of Cad/Cam Ceramic Inlays: An In Vitro Study, Jaraswan Vichitgomen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose. To evaluate the marginal sealing ability of different restorative materials used in deep margin elevation (DME) on zirconia-reinforced lithium silicate CAD/CAM ceramic restoration. Methods. A total of 30 Class II cavities were prepared in freshly extracted human molars with the proximal gingival margin located 1 mm below the cemento-enamel junction (CEJ). All specimens were randomly assigned to one of three groups (n=10): control group, resin composite group (FiltekTM Z350 XT), and resin-modified glass ionomer group (VitremerTM Tricure). In group 1, control group, no DME was performed. The inlay margin of the control group was placed directly onto dentin. In …

The Effect Of Laser Power On Mechanical And Physical Properties Of Ti-6al-4v Eli Fabricated By Selective Laser Melting, Pajaree Termrungruanglert

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to examine the differences in mechanical and physical properties of Ti-6Al-4V extra low interstitial (ELI) fabricated by selective laser melting (SLM) between different laser power. The Ti-6Al-4V ELI alloy samples were printed in dumbbell shape by SLM machine (Trumpf/TruPrint 1000, Germany) with 3 laser powers (75, 100 and 125 W), 8 samples for each group. And the other parameters (spot size 30 µm, scanning speed 600 mm/s, layer thickness 30 µm) were kept constantly. All samples were performed under tensile test with universal testing machine. Moreover, The microhardness test was performed. All data were statistically analyzed with …

Influence Of Demineralized Dentin On Marginal Seal Using Primerless Wet Bonding Technique: In-Vivo Study, Thanyarat Lerttriphob

Chulalongkorn University Theses and Dissertations (Chula ETD)

The purpose of this study was to compare microleakage distance between Class V restorations and tooth interface when using either 4-META-MMA/TBB or MMA/TBB resin adhesives by using 1 % ferric chloride in 1% citric acid (1-1) for conditioning periods of 10s (1-1-10s) 30s (1-1-30s) and 60s (1-1-60s) for in-vivo study. Material and methods: A total of 60 Class V box cavities were divided into 6 groups of 10 specimens (n= 10) on the caries-free, vital, and hopeless periodontally-compromised teeth, scheduled for extraction. A Class V cavity (3mm × 3mm × 1.5mm) was prepared on the buccal or lingual surface located …

Gene Expression And Immunohistochemistry Analysis Of Xenograft And Allograft In Maxillary Sinus Floor Augmentation, Isaya Kungvarnchaikul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Quality of bone is an important factor contributing to the success of dental implants. The bone height in maxillary posterior area sometimes is not enough and might pose risks for placing dental implants. Maxillary sinus augmentation with bone substitutes is used for filling and correcting bony defects. This study aims to determine the differences in gene expressions of TNF-alpha, RUNX2, COL1A1, ALP between xenograft (Bio-Oss®) and allograft (SureOss®). Patients who needed two-stage maxillary sinus floor augmentation were included (n=13). Patient who had dental implant at posterior maxilla without bone substitutes was also used in immunohistochemistry analysis (IHC) (n=1). Bone samples …

Effect Of Ultrasonic Treatment On The Transverse Strength Of Relined Denture Base With Autopolymerizing Acrylic Hard Reline Material, Tithiporn Arunwichit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study evaluated the effect of ultrasonic treatment and surface treatments on transverse strength of denture bases which relined with auto-polymerizing acrylic resin. The study groups, ninety heat-polymerized acrylic resins (64×10×2 mm) were divided by three surface treatments: no surface treatment (N), applied MMA for 180 seconds (MM), applied MF-MA for 15 seconds (MF). They were relined with auto-polymerized acrylic resin to create 64×10×3.3 mm specimens. Then, they were divided further by ultrasonic which were no ultrasonic (X), ultrasonic in water (W), ultrasonic in 30% ethanol (E). As a result, all test groups were classified as NX, NW, NE, MMX, …