LLUSD dental students from the class of 2011, and dental hygiene students from the class of 2010, made their Student Research Presentations as computerized slide shows at Loma Linda University’s Centennial Complex on March 18.
Laboratory 1st Place
Changes in Shade and Glossiness Relative to Changes in pH Found in Bleaching Agents
STUDENTS: Lily Cha, Joohee Oh, Sang Yoo
MENTOR: Dr. Sean Lee
Objective: To test the effectiveness of tooth whitening agents on the shade and gloss of teeth by using 35-38% H2O2 single visit in-office bleaching materials with varying pH values.
Conclusion: Based upon this in-vitro study, high concentrations of H2O2 do not adversely affect the glossiness of the teeth. The effects of pH level on shade or glossiness were insignificant. Clinical Implications: Lower pH concentration does not decrease glossiness nor increase the whitening effect of in-office tooth bleaching agents.
Laboratory 2nd Place
Electromechanical Luxation: An Application of Dynamic Loading
STUDENTS: Larina Chu, Bryce Chun, Michael Hiersche
MENTORS: Dr. Alan Herford, Dr. Mei Lu
Objectives: The electromechanical luxation (EML) technique applies dynamic loading to a tooth through use of an electromechanical actuator. Compared with traditional extraction, this study was to demonstrate the advantages of the application of EML that include the ability to luxate dentition through use of minimal force, decreased time required for extraction post dynamic loading, and reduced trauma during extraction.
Laboratory 3rd Place
In-vitro Comparison of Various Torque Drivers in Implant Prosthodontics
STUDENTS: Jeri Bullock, Christy Pogue, Sophia Sellas
MENTOR: Dr. Jaime Lozada
Objective: A major cause of prosthodontic implant failure is inconsistencies in proper calibration of mechanical torque limiting devices (MTLDs) leading to either over tightening or under tightening of dental implants. The purpose of this study is to determine any inconsistencies in calibration of MTLDs after multiple use and sterilization.
Laboratory, Dental Hygiene, 1st Place
Uptake of Fluoride Foam: A Laboratory Study on Human Enamel
STUDENTS: Lauren Stewart, Stacy Stroup
MENTORS: Dr. Wu Zhang, Ms. Joni Stephens
Stacy Stroup, Lauren Stewart
Purpose: The purpose was to determine the effectiveness of topical acidulated phosphate fluoride (APF) foam when compared to the clinically proven effectiveness of topical acidulated phosphate fluoride gel.
Materials and Methods: The method was similar to that of FDA test method #40 for fluoride uptake by enamel. Test products were an APF gel and APF foam from the same manufacturer and each contained 1.23% fluoride ion. Human 3rd molars were sectioned into buccal and lingual halves to get a total of 30 samples. Each sample was randomly assigned to a control, foam, or gel group. One-quarter inch working surfaces were isolated from each sample. Fluoride-rich outer layer of enamel was removed and baseline readings were found using fluoride electrode. White spot lesions were induced and treatment with gel or foam was performed for both one and four minutes, following manufacturer’s guidelines. Analysis was performed and compared against fluoride standard curve.
Objective: It has been assumed that a high Caries Risk Assessment level indicates that a patient has dental caries, which is ultimately diagnosed by high intraoral bacterial levels. We are attempting to verify the assumption that a high CRA level does in fact correlate with a high intraoral bacterial load of Lactobacillus and Streptococcus mutans.
levels were previously determined during a student cariology course. Subjects were either classified as high or low caries risk depending on responses to inquiries on LLUSD clinical Caries Risk Assessment form. Two intraoral bacterial tests were performed on each subject. The first used a saliva sample to grow a culture on a cariogenic bacteria selective plate. The other tested intraoral measured biofilm ATP levels. We will take a retrospective look at whether or not there is a statistically significant association between assessed caries risk levels and actual intraoral bacteria and ATP levels.
Clinical 2nd Place
Two or More Canals in Mandibular Bicuspids
STUDENTS: Christina Chun, Joanne Oh
MENTOR: Dr. David Jaramillo
Objective: To find the incidence of canal variation in mandibular premolars, such as multiple and bifurcated canals, using cone beam tomography.
Clinical 3rd Place
SEM Examination of Restoration Margins in Vivo: An Observational Study
STUDENTS: Dane Andersen, Ray Arsenault, Justin Schmidt
MENTOR: Dr. Brian Novy
Objective: In our study we devised a protocol and procedure for a closer examination of restorations in-vivo. The focus of our research examined the margin interface between composite, GI, and amalgam restorations in natural teeth under SEM using a highly sensitive impression material. This study explored the viability of studying impression materials using a scanning electron microscope to obtain pictures of widely used dental materials and marginal restoration breakdown.
Clinical, Dental Hygiene, 1st Place
Needle Gauge and Pain Perception
STUDENTS: Allina Lopez, Lucrecia Santana, Kristen Tayler
MENTORS: Dr. Barry Krall, Joni Stephens
Purpose: To determine if needle gauge affects pain perceived while giving a local anesthesia injection. Previous research showed no correlation between needle gauge and pain perceived. Many dental professionals assume larger gauge needles cause more pain than smaller gauge needles. Most of the previous research is over 30 years old, was not standardized; injections were administered in various mouth sites, studies used local anesthetics, and different clinicians were used throughout the same study. For this study, needle insertion was standardized, penetrations were made at the same two locations in each person’s mouth without local anesthetics, and the same clinician administered all insertions.
Objective: Dental students are expected to become competent in designing and developing mucoperiosteal flaps for exodontia and preprosthetic surgeries. Because didactic mucoperiosteal flap instruction is limited to textbook illustrations and generic descriptions, dental students often struggle to comprehend and develop clinical skills related to intraoral flaps. The aim of this study was to develop and evaluate a multimedia educational resource that improves students’ clinical application and comprehension of mucoperiosteal flaps.
Education 2nd Place
Educational DVD for Children Ages 5-8 Years Old: Evaluating the Effectiveness of DVD as a Teaching Tool for Children Ages 5-8 Years Old As Compared to a Conventional Pamphlet
STUDENTS: Junie Baldonado, Emilynda Quinones, Michael Sacro
MENTOR: Dr. Wesley Okumura
Objectives: The goals of this study are to develop an educational DVD that targets children ages 5-8 years old and their parents, and to conduct a preliminary test on the effectiveness of DVD as an educational tool versus a conventional pamphlet.
Oral Hygiene during Orthodontic Treatment
STUDENTS: Stephanie Calvillo, Sheida Khazaii-Tabari, Isaac Penalba
MENTOR: Dr. Leroy Leggitt
Objective: Create a convenient, simple, and interactive tool to educate orthodontic patients about the importance of good oral hygiene during treatment. We evaluated the efficacy of our DVD in contrast to current methods of oral hygiene instructions given by the orthodontist.
Education, Dental Hygiene, 1st Place
Individualized Care Case Presentation
STUDENTS: Pamela Slonaker, Hossai Tahmas, Sherwin Taylor
MENTOR: Dr. Adrian Mobilia
Objectives: The purpose of this educational case research project is to evaluate the effectiveness of a modified toothbrush, in the maintenance of oral care for the special needs patient.
Conclusion: We believe that the use of this device did contribute to the patient’s improved oral health. Further periodic assessment of patient’s oral hygiene skills, and proper functionality of the device is required in each successive appointment to ensure continued efficacy.