Dentistry Commons^™

Distraction Osteogenesis In Edentulous Alveolar Bone With Rhbmp-2 Enhancement, Liviu F. Eftimie

Loma Linda University Electronic Theses, Dissertations & Projects

Distraction osteogenesis, a unique system of affecting rapid bone healing in fractures, realigning malformed bones, and lengthening congenitally short and traumatically shortened bones has become an increasingly utilized technique for the maxillofacial region. The use of distraction osteogenesis has been described for increasing the height of edentulous mandibular alveolar ridges while concurrently forming new bone within the ridge to allow for adequate reconstruction. A standard protocol for performing distraction osteogenesis in the maxillofacial region has been well documented in the literature. Standard distraction osteogenesis requires an initial surgery to place the distraction osteogenesis device and mobilize the segment to be …

Effect Of Ca(Oh)2 On Survival Ability Of A Bacterial Mixture: An In Vitro Study, Nishan Antranik Odabashian

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this in vitro investigation was to evaluate the antibacterial effect of calcium hydroxide on a mixture of nine bacteria associated with endodontic infections at different time intervals and to examine the survival of the same bacteria when in mixture. A total of 102 teeth were used in the first part of the experiment. Eighty teeth were used in eight experimental groups of 10 each, 16 teeth were used for positive and negative controls, and six teeth were used for scanning electron microscopy (SEM). Nine species of bacteria were used in both experiments. These consisted of Enterococcus faecalis, …

Assessment Of Human Alveolar Bone Density By Using Volumetric Ct Machine, Prasit Aranyarachkul

Loma Linda University Electronic Theses, Dissertations & Projects

This study evaluated bone density in designated implants sites using cone-beam computed tomography (CBCT) and compared the measurements to those of quantitative computed tomography (QCT) and subjective bone density evaluation. Sixty-two designated implant sites in 9 human cadavers jaws were used. Indicator rods, 2 mm in diameter, were placed in all sites. CT images representing 1 mm bucco-lingual slices immediately mesial and distal to the rods were selected for density evaluations. Bone density in Hounsfield units (HU) was assessed in a standardized implant area superimposed on the images, and also subjectively evaluated by 2 independent examiners using the Lekholm & …

The Effect Of Mandibular Distraction Osteogenesis On Condylar Rotation In Rabbits, Shelton Hsu

Loma Linda University Electronic Theses, Dissertations & Projects

Distraction osteogenesis (DO) is the gradual lengthening of a healing bone. This surgical technique can be applied to the jawbone to correct an asymmetry or deficiency of the mandible. DO has been added to the list of treatment options for patients with craniofacial anomalies or excessive dental crowding.

Although mandibular distraction osteogenesis has been successfully performed in many patients, the comprehensive effects on the TMJ are not fully understood. The purpose of this study is to compare the amount of rotational and positional change that occurs at the condyles when the rabbit mandible is widened at the midline and paramedian …

Evaluation Of Two Surface Treatments And Two Composite Resins In The Repair Of Fractured Veneered Stainless Steel Crowns, Jennifer Ellen Barry

Loma Linda University Electronic Theses, Dissertations & Projects

Treatment of early childhood caries (ECC) has challenged pediatric dentists. Finding esthetically pleasing yet durable restorations of anterior teeth can be difficult. Veneered stainless steel crowns are an option but clinically, the veneers can fracture. The purpose of this study was to identify the most fracture resistant veneered stainless steel crown and to determine the best method of repair if fractured. The clinical significance is an evaluation of the best method of repairing these fractured crowns. Two surface treatments and two composite restorative materials were evaluated for repair of the fractured veneers. Forty of each of the following crown brands …

Bond Strengths Of Three Orthodontic Adhesives For Direct And Indirect Bonding, Aaron Rondon

Loma Linda University Electronic Theses, Dissertations & Projects

The technique of bonding orthodontic brackets utilizing a transfer tray, otherwise known as indirect bonding, is a dichotomous subject. It allows for more accurate bracket placement and reduced chair time for the patient and doctor, yet its technique sensitivity can yield bracket failures at the time of tray removal. With the recent development of 3M's Sondhi Rapid Set, an adhesive specifically designed for orthodontic bonding, the purpose of this study was to compare this fairly new indirect adhesive with 3M's Transbond XT and Reliance's Rely-A-Bond.

Two hundred and seventy freshly extracted bovine teeth were mounted in acrylic resin and divided …

Linder-Aronson S Analysis Using Rhinomanometry And Newtom, Noel Moser

Loma Linda University Electronic Theses, Dissertations & Projects

Investigations into the effects of airway patency on craniofacial development are essential to ensure that interceptive orthodontic treatment provides the maximum benefit to the patient. The aims of this study were to (1) compare the size of the nasopharyngeal airway space on lateral cephalometric and 3D volumetric radiographs to determine if volumetric scans can be of greater diagnostic value than a lateral cephalometric film in determining the degree of airway blockage or patency and (2) to examine the correlation between functional airway resistance, as evaluated by rhinomanometry, and radiographic constriction due to nasal turbinate and adenoid size.

Twenty-eight subjects from …

Properties Of Experimentally Modified Orthodontic Adhesives: A Pilot Study, Adam Gary Lautt

Loma Linda University Electronic Theses, Dissertations & Projects

Bonded orthodontic brackets were introduced in the early 1960's and, since then, spontaneous debonding has been a constant nemesis. Consequently, many studies involving bond strength have been performed targeting brackets, adhesives, curing methods and types of teeth. The purpose of this study was to compare the properties of adhesive resins that have been experimentally modified in both the filler and the polymer.

Twenty different types of adhesives were prepared with variations in the ratios of the two different fillers (ground glass and Wollastinite fiber) and the polymer. System 1+ was used as a control since it was the original resin …

Comparative Methods Of Measurement To Evaluate Onplant Assisted Anchorage, Marc Reid Larson

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to compare the two-dimensional cephalometric and the three-dimensional tomographic radiographic methods in their ability to assess anatomic measurements while using the Onplant anchoring device in anterior retraction cases.

The Onplant was surgically placed beneath the periosteum of the hard palate. After osseointegration the Onplant was then uncovered and attached to the first molars by means of a transpalatal bar. Conventional orthodontic treatment was then used to retract the anterior teeth after 1^st premolars were extracted.

To evaluate the movement of the Onplant, a three-dimensional measuring tool was needed. Seven different measurements were made …

Evaluation Of Three Bonding Agents In The Repair Of Fractured Veneered Stainless Steel Crowns, Jennifer Liane Hoffer

Loma Linda University Electronic Theses, Dissertations & Projects

Dentists have long been challenged with finding an esthetic yet durable treatment option to restore badly carious anterior teeth. Veneered stainless steel crowns have become one of these options, but these restorations often return with the veneer fractured. To help restore esthetics, the crown may either be replaced or the veneer must be repaired. The purpose of this study was to evaluate the use of three bonding agents (PQ1, C&B Metabond, and Panavia) and one restorative material (Filtek Z250, 3M) in the repair of these fractured stainless steel crown veneers. The clinical significance is to determine the best methods of …

Patient Satisfaction And Effectiveness Of A New Resin Used To Bumper Orthodontic Brackets, Timothy B. Elison

Loma Linda University Electronic Theses, Dissertations & Projects

Fear of pain is a key factor in discouraging patients from seeking orthodontic treatment, with many patients discontinuing treatment due to pain experienced in the early stages of treatment. Patients often complain of traumatized lips and buccal mucosa, which is usually caused by the brackets. Orthodontists try to minimize this pain and discomfort by using bumpering materials. Although wax is the most commonly used product, there are many bracket bumpering materials available.

The purpose of this study was to evaluate the clinical effectiveness and patient comfort/satisfaction of a new flowable resin, Ortho Shield, designed to protect the lips and …

Il-10 And Alveolar Bone Loss, Abdulaziz Saud Al-Rasheed

Loma Linda University Electronic Theses, Dissertations & Projects

Interleukin-10 (IL-10) is a cytokine with anti-inflammatory activities. IL-10 knockout (KO) mice exhibit severe intestinal inflammation in the presence of normal gut flora. We hypothesized that IL-10 KO mice would also be susceptible to inflammatory periodontal disease resulting in alveolar bone loss (ABL). The purpose of this study was to compare naturally occurring ABL in IL-10 KO and wild type (WT) mice. Twelve IL-10 KO and 12 WT mice, age-(7 months) and sex-(male) matched, were used. Half of the mice were on 129/SvEv and half on C57BL/6J background. Animal heads were defleshed and treated to remove all organic material. ABL …

Identification Of Hard Tissue Using Dentin Sialoprotein (Dsp) As A Marker, Wallis E. Andeline

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to identify the early hard tissue formed in experimental pulp exposures capped with calcium hydroxide, mineral trioxide aggregate (MTA) or bone morphogenetic protein-7 (BMP-7) using dentin sialoprotein (DSP) as a marker. The pulps of eighty-five maxillary first, second and third molar teeth from twenty male rats were experimentally exposed. The exposed pulps were capped with calcium hydroxide followed by restoration with amalgam (n = 20), with MTA alone as a pulp capping agent and final restoration (n = 20) or with BMP-7 followed by restoration with MTA (n = 20). Ten teeth with Class …

Pain Experienced By Patients During Periodontal Recall Treatment, Thu-Diem Chung

Loma Linda University Electronic Theses, Dissertations & Projects

The aims of this study were to determine; 1) the degree of pain experienced by patients during probing and debridement; 2) if the treating hygienists could estimate the degree of pain experienced by the patients; and 3) if the patients' pain responses could be predicted by factors such as the patients' age, gender, number of residual periodontal lesions, and the patients' answers to a questionnaire on dental anxiety.

Prior to the maintenance procedures, 2 groups of 20 adult patients to be treated by 2 hygienists completed an anxiety questionnaire. Subsequently, measurements of probing depths were performed, followed by pain ratings …

Microleakage Of Various Restorative Materials Used For Preventive Resin Restorations, Jenny Chung Lee

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: This research was designed to compare the microleakage of various restorative materials used for preventive resin restorations and two methods of cavity preparation. The purpose of this study was: (1) to compare microleakage of four different restorative materials using two different type of preparation methods (bur and air particle abrasion) and (2) whether the use of a pit and fissure sealant over the restoration decreases microleakage.

Methods: One hundred and twenty eight, permanent human molars were randomly divided into four groups and restored with four restorative materials. Each group had been randomly divided into two subgroups. The teeth in …

Hard Tissue Healing Adjacent To Fresh Or Set Mta As Root-End Filling Material, Erol S. Apaydin

Loma Linda University Electronic Theses, Dissertations & Projects

Mineral trioxide aggregate (MTA) has been shown to promote regeneration of periradicular tissues when used as a root-end filling material. The purpose of this study was to compare the effect of fresh MTA with set MTA on hard tissue healing following periradicular surgery.

Under general anesthesia, the root canals of twenty-four mandibular premolars in four 2-year-old beagle dogs were filled with MTA. Two weeks later the root-ends of half of the samples were surgically exposed and resected to the level of set MTA within the canals. After exposing and resecting the other 12 root-ends, class I cavities were prepared in …

Bacteremia Associated With Early Childhood Caries, Eddie Chang

Loma Linda University Electronic Theses, Dissertations & Projects

Previous research has investigated the post-operative bacteria levels caused by a variety of clinical procedures such as anesthetic injections, standard dental procedures, endodontic treatment, periodontal surgery, root scaling, and oral surgical procedures in children. Other studies have suggested that bacteremias are often caused by oral infections. Although numerous studies have examined how oral infections lead to various medical conditions (i.e. brain abscess) none have studied the potential for preoperative bacteremia that may arise in conjunction with early childhood caries (ECC). The purpose of this study was to compare potential systemic facultative and anaerobic bacteria found in otherwise healthy children who …

Development Of A Model For Infective Endocarditis Via Intravenous Injection And Tooth Infection Of Rats Using Pathogenic Bacteria, Shahrokh Shabahang

Loma Linda University Electronic Theses, Dissertations & Projects

Historically, focal areas of infection have been linked to a number of systemic ailments. During the early part of the 20th century, patients who were suffering from inexplicable diseases and who were suspected of having infected teeth were referred to the dentist for multiple extraction of their dentition. The discovery of antibiotics provided a false sense of security that the war against microorganisms is no longer a concern for mankind. However, more recently, it has become common belief that increasing numbers of systemic diseases are linked to chronic infections. Recovery of bacteria from representative tissues has led investigators to believe …

An Evaluation Of Progressively Loaded Root Form Dental Implants Placed Into Extraction Sites, Franco Audia

Loma Linda University Electronic Theses, Dissertations & Projects

The conventional protocol for placement of endosseous root form implants requires up to twelve months of ossification of the extraction socket prior to implant placement. An alternative approach includes the immediate placement of dental implants into a prepared extraction socket following tooth removal. The purpose of this study was to compare conventionally placed non-loaded dental implants with those placed immediately into extraction sockets and progressively loaded in adult patients. A total of twenty implants were placed in eighteen patients and followed for a twelve-month period.

Clinically, no significant differences between conventional and immediately placed dental implants were observed. Radiographically, immediately …

A Comparison Of The Semi-Adjustable Articulator And The Virtual Articulator By Centric Relation And Centric Occlusion Contacts, Donald Shane Witherow

Loma Linda University Electronic Theses, Dissertations & Projects

The articulator as we know it has evolved since the late 1700's, however, it has not changed much in function since the 1970's. Our methods of determining contact information i.e., centric stops and pre-maturities also has not changed much beyond that of "carbon paper". With the advent of new computer technologies, dental models are now being placed into the virtual world through variations of image slicing and laser scanning. The purpose of this paper is to determine if the Occlusogram developed by OrthoCad is as accurate as common methods currently used to determine occlusal contacts.

Twenty dental students volunteered to …

Evaluation Of Alveolar And Soft Tissue Changes After Muscular Release Surgery In Patients Undergoing Fixed Orthodontic Therapy, Virginia Bernal

Loma Linda University Electronic Theses, Dissertations & Projects

This study compared pre-treatment to post-treatment changes in patients undergoing fixed orthodontic therapy who have had muscular release surgery. The alveolar and soft tissue changes in the mandible of 128 subjects from a private practice in Northern Italy (74 females and 54 males) were analyzed. In addition, comparisons were made of changes related to age, gender, facial type, and movement of the lower incisor. Lateral cephalograms were analyzed before and after treatment for skeletal, esthetic, and dentoalveolar changes. Photographs were used to assess changes in the soft tissue of the lower anterior region at pretreatment (Tl) versus post-treatment (T2). The …

The Effect Of Thermocycling On Orthodontic Adhesives As Measured By Tensile Bond Strength, James Changwon Choi

Loma Linda University Electronic Theses, Dissertations & Projects

The objective of this study was to determine the effect of thermocycling only on the tensile bond strengths of four orthodontic adhesives. With the advent of bonded orthodontic brackets, spontaneous bond failures have been a constant confounding phenomenon. Consequently, numerous studies have been published dealing with the 'bond strength' issue. The focus of these studies is varied, and range from the mode of tooth surface preparation, the type of adhesive, and the type of bracket base design used.

Other studies investigated the effects of different testing methods, such as the traditional shear/peel-type to impact testing. This study was designed to …

A Continued Investigation Of Craniofacial Growth In Infant Heart Transplant Recipients Receiving Cyclosporine, John Michael Cornali

Loma Linda University Electronic Theses, Dissertations & Projects

Cyclosporine is an effective immunosuppressive drug that has found widespread application in organ transplantation. A couple of studies, however, have implicated cyclosporine as adversely affecting craniofacial growth in the pediatric population. The purpose of this follow-up study was to continue to evaluate the possible untoward effects of long-term use of cyclosporine on craniofacial growth in a group of infant heart transplantation recipients by re-evaluating as many subjects as possible from the original study and evaluating new subjects. A prospective group (N=29) of eighteen Caucasian subjects (7 female and 11 male, ages 6-15 years) and eleven Hispanic subjects (3 female and …

Probing Bone Level Measurements For Determination Of The Depths Of Class Ii Furcation Defects, Youngil Suh

Loma Linda University Electronic Theses, Dissertations & Projects

Background: Probing bone measurements as an alternative to open bone measurements to evaluate regenerative procedures in furcation defects do not seem to have been used as of yet. The purpose of the present study was to investigate the reliability of probing bone measurements in such defects.

Methods:15 patients scheduled for surgical treatment of a total of 30 mandibular 1st or 2nd molars with buccal or lingual class II furcation defects were studied. During treatment, duplicate vertical and horizontal recordings of probing attachment levels, probing bone levels and open bone levels were taken by independent examiners. Results: Deviations of both …

Hard Tissue Forming Potential Of Mta Compared To Common Root-End Filling Materials, Nooshin Noghreian

Loma Linda University Electronic Theses, Dissertations & Projects

An ideal characteristic of root-end filling materials used in endodontics is the ability to enhance hard tissue formation. Studies have shown that MTA has the potential to enhance hard tissue formation when placed in contact with periradicular tissues. The mechanisms involved in hard tissue formation of MTA and other root-end filling materials have not been completely elucidated. The purpose of this investigation was to study the mechanism of hard tissue formation of commonly used root-end filling materials and MTA by evaluating alkaline phosphatase (ALP) activity and cell layer protein. Extracts of materials tested in this experiment were added to the …

Fracture Properties Of Different Orthodontic Bonding Materials, Daryl Lynden Proctor

Loma Linda University Electronic Theses, Dissertations & Projects

Spontaneous debonding has proven a constant problem since the introduction of bonded orthodontic brackets in the early 1960's by Newman¹.

Components in classic bond strength testing are the bracket, the adhesive, the adhesive curing method, the type of teeth used, and the test method. These tests lead to extensive and compounding variables that make it difficult to evaluate the performance of any of the components individually.

The purpose of this study was to compare several contemporary orthodontic bonding adhesives by testing the physical and mechanical characteristics of the adhesives alone. Material properties compared were sonic and tensile measurements …

Evaluating Pit And Fissure Sealant Materials When Used As Bonding Agents In Preventive Resin Restorations, Paul Shields Gerber

Loma Linda University Electronic Theses, Dissertations & Projects

Preventive resin restorations (PRR) are an increasingly popular alternative to the traditional amalgam restoration for small occlusal caries in posterior teeth. The technique for placing the PRR was first suggested by Simonsen (1980) and involved a minimal removal of tooth structure. After preparation, the tooth is etched, followed by an application of a bonding agent, filled with composite, and then sealed with a pit and fissure sealant. In an attempt to simplify the protocol of the PRR this study was designed to determine if pit and fissure sealant material could serve a dual role and eliminate the need for a …

Optimum Bonding Time Of Four Different Curing Lights, Nathan Don Cotten

Loma Linda University Electronic Theses, Dissertations & Projects

With the development of new high-intensity curing lights, the time required to bond orthodontic brackets is steadily decreasing. The objective of this study was to determine the optimum curing time for bonding orthodontic brackets using four different visible curing lights (Standard Optilux 501, High Intensity Optilux 501 with Turbo Tip, Virtuoso Plasma Arc, and ESPE LED light). This study also tested the new generation of light emitting diode (LED) lights to determine if they can be used for bonding orthodontic brackets. Three hundred freshly extracted bovine teeth were mounted in acrylic resin and divided into 20 groups of 15 teeth …

Disinfection Of Dentin By Intracanal Laser Irradiation: An In Vitro Model, Silvia Cristina Mafra Cecchini

Loma Linda University Electronic Theses, Dissertations & Projects

A possible cause for root canal failure is the persistence of bacteria that have colonized dentinal tubules. To reduce this risk and, if possible, to also shorten the time consuming endodontic therapy, new equipment and materials are constantly being introduced. The aim of the present investigation was to study the effect of disinfection of dentinal tubules by intracanal laser irradiation using an in vitro model. The groups irradiated by various lasers were compared with calcium hydroxide, a material frequently used as intracanal medication between appointments. Freshly extracted, intact bovine incisors were used. The root cementum was removed and the teeth …

Spanish-Speaking Parents’ Attitudes Toward Explanations Of Anesthetic Techniques, Melba Zuniga Mayes

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE Little attention has been given to the issue of obtaining informed consent for conscious sedation and general anesthesia from Spanish-speaking parents living in the United States. The treatment of pediatric dental patients can only be as effective as the extent to which Spanish-speaking parents consent to the dental treatment. The purpose of this study was to identify valuable information that dentists can utilize to obtain an informed consent for conscious sedation and general anesthesia from Spanish-speaking parents.

METHOD Each Spanish-speaking parent in the sample was given one of the following explanations regarding an anesthetic technique: 1) verbal presentation for …