Dentistry Commons^™

Ada News - 12/14/2009, American Dental Association, Publishing Division

ADA News

Established in 1970 as the official newspaper of the American Dental Association, the ADA News serves practicing dentists and others allied to the dental profession in the U.S. and internationally. It is the No. 1 source of news and information about the many benefits and services the ADA delivers to members daily as well as timely information on scientific, social, political and economic developments affecting dentistry and health care.

Antibiotic Use By Members Of The American Association Of Endodontics: A National Survey For 2009- A Follow Up From The Report In 1999, Pye Kyu

Theses and Dissertations

The purpose of this study was to determine the changes in prescribing habits of active members of American Association of Endodontics (AAE) with regards to antibiotics in comparison to the findings reported by Yingling et al. in 1999. The invitations to take the online survey were sent via email to 2593 active members. A response rate of 37.75% was obtained. It was determined to be adequate for analysis and for comparison to the results obtained by Yingling et al. Comparisons between the percentages shown in this survey and the previous survey were tested using a z-test. An ANOVA model was …

Collagenous Myofibroblastic Tumor Of The Mandible: Case Report Of A Unique Locally Aggressive Neoplasm Journal Head And Neck Pathology, Jason W. Nash, Amy C. Hessel, Nadarajah Vigneswaran, Adel K. El-Naggar

Journal Articles

We report a locally aggressive collagenous myofibroblastic neoplasm of the mandible in an 18-year-old male. Clinically, the lesion presented with rapid growth and irregular mandibular bone destruction. Grossly, the tumor was 10 cm in greatest dimension, light-tan, firm, and involving the posterior one-thirds of the body and inferior half of the left mandibular ramus. Histologically, the lesion was composed of a loose spindle cell proliferation interspersed with periodic dense bands of collagen. The spindle cells reacted positively to smooth muscle actin, calponin, and focally to desmin and were negative for S-100, pan-cytokeratin, CD99, CD34 and caldesmon, supporting myofibroblastic derivation. At …

Pulp Polyp Associated With A Natal Tooth: Case Report, Brian D. Hodgson, Rodney Vergotine, Lance Lambert

School of Dentistry Faculty Research and Publications

Natal teeth are an infrequent occurrence at birth. Often these teeth are extracted because they are very mobile and pose a risk of aspiration. This is a rare case in which a natal tooth was extracted by the pediatrician with his fingers. A root fragment remained and out of this developed a large pulp polyp. This relationship has not been previously reported.

Dental Treatment Under General Anesthesia In Healthy And Medically Compromised/Developmentally Disabled Children: A Comparative Study, Juan Pablo Loyola-Rodriguez, Veronica Zavala-Alonso, Cinthya L. Gonzalez-Alvarez, Lilia A. Juarez-Lopez, Nuria Patiño-Marin, Cesar D. Gonzalez

School of Dentistry Faculty Research and Publications

Aim: To compare the type, number of procedures and working time of dental treatment provided under dental general anesthesia (DGA) in healthy and medically compromised/developmentally disabled children (MCDD children). Design: This cross-sectional prospective study involved 80 children divided into two groups of 40 children each. Group 1 consisted of healthy and Group 2 consisted of MCDD children. Results: Healthy children needed more working time than MCDD children, the means being 161±7.9 and 84±5.7 minutes, respectively (P= 0.0001). Operative dentistry and endodontic treatments showed a significant statistical difference (P= 0.0001). The means of procedures were 17±5.0 for healthy children and 11±4.8 …

Comparison Of Cephalometric Norms Of Esthetically Pleasing Faces, Attiya Jawaid Shaikh, Arif R Alvi

Section of Dental-Oral Maxillofacial Surgery

OBJECTIVE: To establish cephalometric norms of a sample of aesthetically pleasing Pakistani faces and to analyze differences and similarities with accepted standards for Caucasians.

STUDY DESIGN: Analytical cross sectional study.

PLACE AND DURATION OF STUDY: Carried out at Alvi Dental Hospital, Karachi, from August 2007 to February 2008.

METHODOLOGY: Cephalometric tracings were analyzed on a sample of 40 (20 males and 20 females) Pakistani young adults, aged 18-25 years, with full complement of permanent teeth, no previous orthodontic treatment and pleasing profile. To check the reliability of the measurements, 20 randomly selected cephalograms were retraced. None of the measurements showed …

Ada News - 11/16/2009, American Dental Association, Publishing Division

ADA News

Established in 1970 as the official newspaper of the American Dental Association, the ADA News serves practicing dentists and others allied to the dental profession in the U.S. and internationally. It is the No. 1 source of news and information about the many benefits and services the ADA delivers to members daily as well as timely information on scientific, social, political and economic developments affecting dentistry and health care.

Ada News - 11/02/2009, American Dental Association, Publishing Division

ADA News

Established in 1970 as the official newspaper of the American Dental Association, the ADA News serves practicing dentists and others allied to the dental profession in the U.S. and internationally. It is the No. 1 source of news and information about the many benefits and services the ADA delivers to members daily as well as timely information on scientific, social, political and economic developments affecting dentistry and health care.

Adding Dental Therapists To The Health Care Team To Improve Access To Oral Health Care For Children, David A. Nash

Oral Health Science Faculty Publications

Oral Health in America: A Report of the Surgeon General, and the subsequent National Call to Action to Promote Oral Health, contributed significantly to raising awareness regarding the lack of access to oral health care by many Americans, especially minority and low-income populations, with resulting disparities in oral health. The problem is particularly acute among children. The current dental workforce in the United States is inadequate to meet the oral health care needs of children. It is inadequate in terms of numbers of dentists, as well as their geographic distribution, ethnicity, education, and practice orientation. Dental therapists, paraprofessionals …

Effects Of Different Denture Cleansers On The Tensile Bond Strength Of Denture Liners, Selda Keskin

The effect of two denture cleansers (Polident1 and Protefix1) on the tensile bond strength between four soft liner materials (Molloplast B1, Permaflex1, Sofreliner Tough Medium1, and GC Reline Soft1) and a conventional denture base resin was investigated. For each of the liner materials 35 test specimens were prepared according to test the requirements and assigned into seven groups (n¼5). Before tensile testing, five of the liner specimens were kept in water or soaked in two cleansing solutions during 2 and 7 d. Five other samples served as a control group subjected directly to tensile testing. The bond strength values were …

Tensile Bond Strength Of A Highly Cross-Linked Denture Tooth To The, Selda Keskin

This study compared tensile bond strengths between conventional compressionmolded heat (HC)-, auto (AP)-, and microwave-polymerized (MC) poly(methyl methacrylate)-based denture resins and a relatively new injection-molded, microwave-polymerized polyurethane based resin (MI) bonded to a highly cross-linked denture tooth. In the first part of the experiments, denture teeth were used as received. In the second part, they were treated with dichloromethane to see its effect on bonding of conventional denture bases (HCS and APS). Bond strength was tested in tension according to ADA specification No.15. The results showed that the HC group failed cohesively because of higher interface bonding (49.95 MPa) compared …

Quantification Of The Individual Characteristics Of The Human Dentition, L Thomas Johnson, Thomas W. Radmer, Thomas S. Wirtz, Nicholas M. Pajewski, David E. Cadle, James Brozek, Daniel D. Blinka

School of Dentistry Faculty Research and Publications

The considerations for admissibility suggested by the Daubert trilogy challenge forensic experts to provide scientific support for opinion testimony. The defense bar has questioned the reliability of bitemark analysis. Under an award from the U. S. Department of Justice, via the Midwest Forensic Resource Center, a two-year feasibility study was undertaken to quantify six dental characteristics. Using two computer programs, the exemplars of 419 volunteers were digitally scanned, characteristics were measured, and frequency was calculated. The study demonstrates that there were outliers or rare dental characteristics in measurements. An analysis of the intra-observer and inter-observer consistency demonstrated a high degree …

Teaching Casual Random Blood Glucose Screening To Second-Year Dental Students, Thomas W. Radmer, Moawi M. Kassab, Denis P. Lynch, Martin Walsh

School of Dentistry Faculty Research and Publications

In our project, archived casual random blood glucose levels of second-year dental students who were taught the mechanics of self-testing were retrieved. Material data were analyzed by calculating means, medians, standard deviations, and ranges for 161 dental students screened by this casual and random self-monitoring of blood glucose levels as described by the American Diabetes Association’s 2008 Standards of Medical Care in Diabetes. Three types of data were assessed in this study. The first was the casual blood glucose levels of second-year dental students. The second was the data retrieved from student questionnaires regarding the value of teaching casual random …

Ada News - 10/19/2009, American Dental Association, Publishing Division

ADA News

Established in 1970 as the official newspaper of the American Dental Association, the ADA News serves practicing dentists and others allied to the dental profession in the U.S. and internationally. It is the No. 1 source of news and information about the many benefits and services the ADA delivers to members daily as well as timely information on scientific, social, political and economic developments affecting dentistry and health care.

Ada News - 10/05/2009, American Dental Association, Publishing Division

ADA News

Established in 1970 as the official newspaper of the American Dental Association, the ADA News serves practicing dentists and others allied to the dental profession in the U.S. and internationally. It is the No. 1 source of news and information about the many benefits and services the ADA delivers to members daily as well as timely information on scientific, social, political and economic developments affecting dentistry and health care.

Primary Language Spoken At Home And Children's Dental Service Utilization In The United States, Matthew Noyce, Aniko Szabo, Nicholas M. Pajewski, Scott Jackson, T. Gerard Bradley, Christopher Okunseri

School of Dentistry Faculty Research and Publications

Objective: Language barriers have been well documented as a contributing factor to disparities in the receipt of medical services, especially for Hispanic children. However, there is a paucity of information on the effect of language barriers on children's dental service utilization. We examined the association of primary language spoken at home with the receipt of preventive and routine dental care for children in the United States. Methods: We analyzed data from the Medical Expenditure Panel Survey (2002-2004), which contains data on 21,049 children weighted to represent 75.8 million children nationally. Results: Among children aged 1-18 years, 13 percent spoke a …

Frequency And Distribution Of Endodontically Treated Teeth, Hina Ahmed, Durr E. Sadaf, Munawar Rahman

Section of Dental-Oral Maxillofacial Surgery

Objective: To determine the distribution and pattern of carious teeth involvement in permanent teeth requiring endodontic treatment. Study Design: Cross-sectional study. Place and Duration of Study: Dental Section of The Aga Khan University Hospital, Karachi, from September 2004 to March 2005. Methodology: Data was collected from the dental records of patients. Tooth was the unit of evaluation. Variables studied were demographics, tooth type, etiology of endodontic treatment and pattern of caries involvement. Data was analyzed using chi-square test and Fischer’s exact test. Results: The total number of patients was 190; total number of teeth involved were 235. Females had more …

Bactericidal Effects Of Low Temperature Atmospheric Pressure Plasma On Porphyromonas Gingivalis, Arwa Mahasneh

Dental Hygiene Theses & Dissertations

Purpose: The biomedical application of low temperature atmospheric pressure plasma (LTAPP) is a collaborative interest for engineering, medical, dental and biological researchers. This laboratory study tested whether LTAPP can limit growth of Porphyromonas gingivalis, a periodontal pathogen strongly associated with periodontal disease, disease progression, and refractory periodontitis. Methods: After extensive pilot trials, the study consisted of 24 agar plate samples of P. gingivalis- 20 samples were exposed to LTAPP at 5, 7, 9 and 10 minutes and 4 control samples were exposed to helium gas only. Immediately after exposures, the samples were incubated anaerobically for 72 hour at …

A Finite Element Study Of The Multilayered Structured Dental Post, Noor Hayaty Abu Kasim Abu Kasim N.H.

Noor Hayaty Abu Kasim Abu Kasim N.H.

Ideally, dental post should have stiffness that is similar to the crown at the coronal part and stiffness similar to the dentine at the apical part. This will reduce stress concentration at either coronal or the apical parts of the dentine and minimize the chance of interfacial loosening and enhance the reliability of post. Objective: To investigate the biomechanical behaviour of Multilayered Structured Dental Posts (MSDPs) using finite element analysis (FEA). Methods: Two models of MSDPs consist of multilayer design of xTi-yHA composition added to a zirconia layer (model A) and the same compositions added to alumina layer (model B) …

Ada News - 09/21/2009, American Dental Association, Publishing Division

ADA News

Established in 1970 as the official newspaper of the American Dental Association, the ADA News serves practicing dentists and others allied to the dental profession in the U.S. and internationally. It is the No. 1 source of news and information about the many benefits and services the ADA delivers to members daily as well as timely information on scientific, social, political and economic developments affecting dentistry and health care.

Ada News - 09/07/2009, American Dental Association, Publishing Division

ADA News

Established in 1970 as the official newspaper of the American Dental Association, the ADA News serves practicing dentists and others allied to the dental profession in the U.S. and internationally. It is the No. 1 source of news and information about the many benefits and services the ADA delivers to members daily as well as timely information on scientific, social, political and economic developments affecting dentistry and health care.

New Tfii-I Family Target Genes Involved In Embryonic Development, Aleksandr V. Makeyev, Dashzeveg Bayarsaihan

SoDM Articles

Two members of the TFII-I family transcription factor genes, GTF2I and GTF2IRD1, are the prime candidates responsible for the craniofacial and cognitive abnormalities of Williams syndrome patients. We have previously generated mouse lines with targeted disruption of Gtf2ird1 and Gtf2i. Microarray analysis revealed significant changes in the expression profile of mutant embryos. Here we described three unknown genes that were dramatically down-regulated in mutants. The 2410018M08Rik/Scand3 gene encodes a protein of unknown function with CHCH and hATC domains. Scand3 is downregulated during mouse embryonic stem cell (ES) differentiation. 4933436H12Rik is a testis-specific gene, which encodes a protein with no known …

Using Cone Beam Computed Tomography To Identify A Prediction Model For Obstructive Sleep Apnea, Jodi Parker

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Obstructive Sleep Apnea (OSA) patients have increased risk of morbidity and mortality. Early diagnosis may reduce morbidity and mortality. Prediction of OSA from imaging may help to identify OSA patients earlier in life. CBCT can be used for OSA diagnostic imaging due to its three-dimensional (3D) visualization of the upper airway and craniofacial complex. Magnification associated with conventional 2D radiography is eliminated with CBCT, and radiation to the patient is significantly less than previous modalities used to measure craniofacial & airway measurements associated with OSA. During a CBCT scan, the patient's image is taken supine, rather than the upright …

Influence Of Stainless Steel Orthodontic Brackets On Magnetic Resonance Imaging, Christian James Hoybjerg

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Magnetic resonance imaging (MRI) machines provide 2D as well as 3D images that are excellent in contrasting soft-tissue in the maxillofacial region and are void of ionizing radiation. The drawbacks include the lack of depiction of cortical bony detail and image degradation caused by substances in the scanned area. Specifically, in the orthodontic field stainless steel brackets cause more distortion of MR images then any other bracket material. It is unknown what type of stainless steel alloy causes the most MRI distortion. The purpose of this study is to evaluate the degree of craniofacial MR distortion caused by various …

Cytotoxicity Of Two Thai White Portland Cements Mixed With Bismuth Oxide On Primary Human Osteoblasts, Thanomsuk Jearanaiphaisarn, Chootima Ratisoontorn

Chulalongkorn University Dental Journal

Objective To compare the cytotoxicity of two Thai white portland cements mixed with bismuth oxide (PCA and PCB) with white mineral trioxide aggregate (white ProRoot® MTA) on primary human osteoblasts and to investigate cell morphology on the materials. Materials and methods PCA, PCB and white ProRoot® MTA were mixed with distilled water. Standard cylinder discs of each tested material were prepared. Primary human osteoblasts were exposed to material extracts on different extraction time points (days 1, 3, 7 and 14). Cell viability was assessed by using methyltetrazolium assay. Differences in mean percentage of cell viability were analyzed by one-way analysis …

The Influence Of Work Of Fracture On Six Orthodontic Bonding Systems, Tyler S. Pritchard

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Bonding is the primary method of attaching brackets to teeth in modem orthodontics. Thus, many studies have focused on the maximum shear bond strength values of orthodontic adhesives. In contrast, very little research has been performed considering the work of fracture of orthodontic bonding systems. Work of Fracture is defined as the area under the curve of a stress-strain graph. Previous shear bond strength studies measured the force necessary to produce bond failure. The purpose of this study was to measure the maximum shear force and displacement of six bonding systems and to calculate the work of fracture.

Materials …

Effects Of Functional Appliances On Pharyngeal Airway Dimensions: A Cone Beam Computed Tomography Study, Melissa K. Lee

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Functional appliances are intended to correct by incremental advancement of the mandible for correction of skeletal Class 11 relationships. Similar in design to functional appliances, mandibular advancing devices (MAD) are used for obstructive sleep apnea (OSA) patients as they increase the size of the airway by drawing the tongue and soft palate forwards, and thus maintain its patency during sleep. It has been shown that significant increases in airway dimensions and decreases in airway resistance were gained in OSA patients while evaluated with a MAD in place. This retrospective study evaluated volumetric, cross-sectional area and linear changes in the …

Observer Reliability Of Cephalometric Landmark Identification On 3-D Mr Images, Michael S. Pollack

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Cephalometric analysis is a cornerstone of orthodontic diagnosis, yet much information is lost when 3-dimensional structures are assessed with 2-dimensional methods. CBCT offers 3-dimensional imaging but at the cost of higher levels of ionizing radiation. Magnetic resonance imaging provides 3-dimensional imaging without ionizing radiation and additionally imparts visualization of soft tissue structures. Prior to employing MR images for cephalometric analysis, reliability of landmark identification must be assessed. The purpose of this study was to evaluate intra- and interobserver reliability in 3-dimensional landmark identification using MR images.

Materials and Methods: Fifteen cranial MR images (3.0 T, MP-RAGE) from subjects between …

Effects Of Functional Appliances On The Tmj And Mandibular Length Of Skeletal Class Ii Patients: A Cone Beam Computed Tomography Study, David C. Lee

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Functional appliances have been efficiently used in the treatment of Class II malocclusions caused by retrognathic mandibles. Cone beam computed tomography has enabled us to make more accurate linear measurements by eliminating superimposition of other structures and to analyze skeletal anatomic detail in all three planes of space. This retrospective study evaluated the osseous changes in the temporomandibular joint (TMJ) and length of the mandible in skeletal Class II malocclusion patients treated with the fixed functional appliances and compared measurements with Class I malocclusion patients treated with orthodontic mechanics that did not alter skeletal relationships.

Materials and Methods: Twelve …

ความสําเร็จของการปิดทับเนื้อเยื่อในโดยอ้อมด้วยแคลเซียมไฮดรอกไซด์เปรียบเทียบกับการ รักษาเนื้อเยื่อในที่มีชีวิตด้วยยาปฏิชีวนะผสม 3 ชนิดในฟันกรามน้ํานมล่าง, ตรีษา ศาสตระรุจิ, ชุติมา ไตรรัตน์วรกุล

Chulalongkorn University Dental Journal

วัตถุประสงค์ เพื่อเปรียบเทียบความสําเร็จทางคลินิกและภาพรังสีที่ระยะเวลา 6 เดือนของวิธีปิดทับเนื้อเยื่อใน โดยอ้อมด้วยแคลเซียมไฮดรอกไซด์และวิธีรักษาเนื้อเยื่อในที่มีชีวิตด้วยยาปฏิชีวนะผสม 3 ชนิดในฟันกรามน้ํานมล่าง วัสดุและวิธีการ ตัวอย่างศึกษาคือ ฟันกรามน้ํานมล่างที่มีรอยผลึกใกล้เนื้อเยื่อในที่ไม่มีอาการหรืออาการแสดงถึง การอักเสบของเนื้อเยื่อในชนิดผันกลับไม่ได้ จํานวน 68 ของผู้ป่วยเด็กอายุ 3-8 ปี แบ่งฟันออกเป็นสองกลุ่ม โดยการสุ่ม กลุ่มควบคุมคือฟันที่รักษาด้วยวิธีปิดทับเนื้อเยื่อในโดยอ้อมด้วยแคลเซียมไฮดรอกไซด์ (34 ซี่) กลุ่มทดลองคือฟันที่รักษาด้วยวิธีรักษาเนื้อเยื่อในที่มีชีวิตด้วยยาปฏิชีวนะผสม 3 ชนิด (34 ซี่) ทั้งสองกลุ่มจะได้รับ การบูรณะด้วยครอบฟันโลหะไร้สนิมในครั้งเดียวกับการรักษาเนื้อเยื่อในและเปรียบเทียบความสําเร็จทางคลินิกและ ภาพรังสีที่ระยะ 6 เดือนของทั้งสองวิธีโดยใช้การทดสอบด้วยไคสแควร์ที่ระดับความเชื่อมั่นร้อยละ 95 ผลการศึกษา ความสําเร็จทางคลินิกที่ระยะ 6 เดือนของทั้งสองวิธีอยู่ที่ร้อยละ 100 แต่ความสําเร็จทางภาพรังสี ที่ระยะ 6 เดือนของวิธีปิดทับเนื้อเยื่อในโดยอ้อมด้วยแคลเซียมไฮดรอกไซด์อยู่ที่ร้อยละ 82.35 และวิธีรักษา เนื้อเยื่อในที่มีชีวิตด้วยยาปฏิชีวนะผสม 3 ชนิดอยู่ที่ร้อยละ 76.47 ความล้มเหลวทางภาพรังสีที่พบมากที่สุดคือ พบเงาดําบริเวณรอยแยกรากฟัน โดยพบร้อยละ 14.70 ในกลุ่มปิดทับเนื้อเยื่อในโดยอ้อมด้วยแคลเซียมไฮดรอกไซด์ และร้อยละ 17.65 ในกลุ่มวิธีรักษาเนื้อเยื่อในที่มีชีวิตด้วยยาปฏิชีวนะผสม 3 ชนิด สรุป ความสําเร็จทางคลินิกและภาพรังสีที่ระยะเวลา 6 เดือนของวิธีปิดทับเนื้อเยื่อในโดยอ้อมด้วยแคลเซียม ไฮดรอกไซด์ไม่มีความแตกต่างกับวิธีรักษาเนื้อเยื่อในที่มีชีวิตด้วยยาปฏิชีวนะผสม 3 ชนิดอย่างมีนัยสําคัญทางสถิติ (p = 0.76) (2 ทันต จุฬาฯ 2552;32:157-66)