Dental Materials Commons^™

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 …

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 …

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 …

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

Graduate Theses, Dissertations, and Problem Reports (ETD)

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 …

A Comparison Of Implant Stability Between Two Dental Implant Designusing Two Different Stability Measuring Technique, Chanikarn Chaksupa

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective To investigate the primary stability of aggressive thread design implant comparing to nonaggressive thread design implant and to evaluate the correlation between ISQ values and IST values. Materials and methods 96 implants were used in this study. 48 BLT Straumann® and 48 BLX Straumann® were used. All implants were digitally planned and placed in 3D printed model using computer assisted guided surgery. The edentulous area at models were packed with randomized pattern of four different kinds of polyurethane blocks to replicate mixed cancellous bone. Postoperative implant stability measurement was performed immediately after implant insertion. Implant stability was measured by …

The Relative Occlusal Force Of Natural Tooth Adjacent To Distal Extension Implant Support Fixed Prosthesis Using T-Scan Analysis : A Cross Sectional Study, Chin Purintarapiban

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: This cross-sectional study aimed to compare the relative occlusal force between implant in the distal end and tooth adjacent to implant in maximum intercuspation. Methodology: Patients with implant restoration replacing teeth in free end space adjacent to natural tooth were recalled. The occlusion is examined as shim stock passes through the occluded tooth in heavy or light bites. The heavy bite or a light bite with shim stock that cannot pull through is HB1 or LB1. If the shim stock can pull through it is considered HB0 or LB0. The implant is classified into 3 groups, HB1LB0, HB1LB1, and …

Accuracy Comparison Of Dental Implants Obtained By Dynamic Cais In All-On-4 Edentulous Area Among Different Types Of Bone Density: An In Vitro Study, Jutasinee Pornpolsarun

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Determination of available bone is particularly important in implant placement quality of bone can affect the accuracy implant placement. Currently, Dynamic navigation system illustrated the improvement of implant accuracy, The accuracy of implant placement using computer-assisted implant placement system (CAIS) is unknown. As a result, the goal of this study was to see how bone density affected implant placement accuracy with Dynamic CAIS. Purpose: To determine the effect of different bone density in the accuracy of implant placement using dynamic navigation system Materials and Methods: The study's overall design includes a single doctor planning each implant using a CBCT …

A Comparison Of Implant Stability Between Two Implant Systems Using Guided Surgery In Inexperienced Surgeons, Pinmuk Supachaiyakit

Chulalongkorn University Theses and Dissertations (Chula ETD)

Aim: To investigate the implant stability in relation to two different implant designs, a cylindrical shaped single threaded design (CS/ST) and a tapered shaped double threaded design (TS/DT) using RFA over the first 8 weeks. Materials and Methods: 28 implants were randomly allocated into two groups and were placed as single tooth implant in the posterior arch. CBCT scan was used to determine the bone density and the implants were placed with guided surgical template by inexperienced surgeons which were prepared with the same implant planning software. The implant stability was measured using the RFA over the first 8 weeks …

Clinical Accuracy Between Planned And Placed Posterior Implant Position Of Two Static Implant Planning Software Programs In Inexperienced Operators, Wanwanat Singthong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: This study aimed to evaluate and examine the difference in posterior implant positioning between the planned and placed positions when inexperienced operators used two static implant planning software packages following a fully guided implant surgery protocol in the clinical field. Materials and methods: Twenty-four patients who needed single posterior implant placement were randomly divided into two groups based on the used implant planning software (group 1, coDiagnostiX, n=12; group 2, Implant Studio, n=12). The dataset of the placed implant position, generated from digitizing the implant impression, was superimposed on the planned implant position. The number of horizontal, angular, and …

Influence Of Training Schedule On Learning Outcome Of Motor Skills For Dynamic Navigation System In Esthetic Zone, Wirawat Kunakornsawat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Backgroud: Currently, a novel dynamic navigation system has been demonstrated to improve the accuracy of 3D implant placement, but proficiency in this system is quite difficult to achieve. Thus, the training course for using this system is required. The distributed training has been shown to be superior to massed training, it is still uncertain whether differences in distributed training rest periods will result in the best motor skill acquisition for dynamic navigation system. Purpose: The objective of this study was to determine the most effective schedule for training motor skill needed to perform implant placement using dynamic navigation system: distributed …

Comparison Of Esthetic Perception Of Maxillary Central And Lateral Incisors Between Dentists And Laypersons, Pastharee Jarusripat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: To compare esthetic perception between dentists and laypersons by difference of asymmetrical width and length of maxillary central and lateral incisors under 5 and 15 seconds evaluation time. Materials and Methods: Photos of women were digitally altered by Adobe Photoshop® program to create image with symmetrical and asymmetrical tooth width or length in 0.5 mm increments. Final images were randomly present on computer screen using an equal ratio to actual tooth. Thirty-six dentists and 36 laypersons were asked to rate attractiveness of those smiles on a numerical rating scale within 5 and 15 seconds of evaluation time. Mann-Whitney U …