Digital Commons Network^™

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 …

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 & …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …