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At least 703 records · Page 39Linked to original sources
PubMed1981

Clinical applications of direct orthodontic bonding systems.

Utilization of direct bonding of attachments to tooth surfaces has greatly facilitated traditional full-banding procedures for patients undergoing complete orthodontic therapy. The bonding of plastic brackets best relegated to maxillary anterior teeth is supplemented with metal bracket bonding for posterior teeth. Buccal tubes attached to metal mesh pads may also be bonded, although conventional orthodontic bands and buccal tubes are ideal for posterior teeth. Bonded metal brackets can accommodate resilient arch wires, torque sectionals, and root paralleling springs. Direct bonding to recently exposed impacted cuspids facilitates elastic traction procedures--once difficult to do before at least partial eruption of these teeth. In addition to the treatment of full orthodontic cases, direct orthodontic bonding is also an adjunct in the correction of single tooth malpositions. The continual improvement of composite resin systems has truly provided a renaissance in orthodontic techniques and has greatly benefited treatment methods.

Acid Etching, Dental↗
PubMed1981

Calcification of glutaraldehyde-preserved porcine xenografts in young patients.

In a series of 568 patients with glutaraldehyde-preserved porcine xenografts followed for up to 3 1/2 years, calcification and stenosis of the xenograft has proved to be an important cause of valve failure. We have seen this complication only in children and adolescents. Seven of 54 patients under 16 years of age at the time of initial operation have required reoperation for calcification and prosthetic stenosis. Three patients who died had calcified, stenosed prosthesis at autopsy. The calcification has involved all of the cusps of the affected prostheses, and the calcified area often was enclosed by a superficial layer of noncalcified cuspidal tissue. We no longer insert xenograft valves in young patients.

Adolescent↗
PubMed1981

Structure of bovine parietal pericardium and of unimplanted Ionescu-Shiley pericardial valvular bioprostheses.

To obtain a basis for the evaluation of postimplantation changes in bioprostheses made of parietal pericardium, we conducted comparative histologic, scanning and transmission electron microscopic studies of the structure of (1) normal bovine parietal pericardium, (2) glutaraldehyde-treated pericardial patches to be used for repair of cardiac defects, and (3) pericardial tissue cusps of unimplanted Ionescu-Shiley valves. Bovine parietal pericardium has three layers: (1) the serosa, or mesothelial cell layer; (2) the fibrosa, formed by diversely oriented, wavy bundles of collagen and by elastic fibers, and (3) the epipericardial connective tissue layer, which is partly continuous with the pericardiosternal ligaments. Pericardial patches and pericardial bioprosthetic cusps differ from normal pericardium by being denuded of mesothelium but they have normal degrees of waviness in their collagen. In Ionescu-Shiley valves, the inflow and outflow surfaces of each cusp correspond to the epipericardial and serosal surfaces of parietal pericardium, respectively. The inflow surfaces have a coarse texture, characterized by large bundles of collagen, and the outflow surfaces have numerous grooves, 10 to 30 mu in width and 20 mu in depth, which probably result from pressure exerted on the cuspidal surfaces by cotton material either during manufacturing or packing of the valves. Comparisons of the structure of bioprosthetic pericardial cusps and porcine aortic valve cusps show that the latter have reduced degrees of collagen waviness and a different layered structure: A layer similar to the spongiosa of aortic valve cusps is not present in pericardium. The functional implications of these observations are discussed in detail.

Animals↗
PubMed1976

[Experiences with the CM snap attachment].

An experience report is given on 250 CM Snap attachments. The retention of these precision attachments is due to the coil spring and cylinder. This system has proven to be exceedingly lasting. The range of indication is wide because of the many types available. The smaller types may even be used in cuspid teeth, since they are no bigger than the American precision attachments. Under certain circumstances the indication is extended to the free end saddle denture. Small tricks are shown in order to facilitate insertion for the patient. Finally, certain mistakes observed in the mounting procedure are pointed out.

Dental Abutments↗
PubMed1994

Guided tissue regeneration in surgically created 3-walled and 2-walled periodontal osseous defects in monkeys.

BACKGROUND: In the previous clinical studies, guided tissue regeneration resulted in periodontal regeneration after treatment of 3-walled intrabony defects. The purpose of the present study was to compare the regenerative potential of 3-walled and 2-walled surgically created periodontal osseous defects in monkeys following placement of a biocompatible, porous polytetrafluorethylene membrane. METHODS: In each of 8 Taiwan monkeys, 2 maxillary and 2 mandibular teeth were selected for experimentation. Using a diamond bur, 3-walled osseous defects were created on the distal of the maxillary cuspid and the mesial of the mandibular second bicuspid of one side. Two-walled (lingual wall and proximal wall) osseous defects were created on the contralateral side. After root planing, teflon membranes were applied to the mandibular test teeth. In the maxilla, all procedures were the same except for the placement of teflon membranes. Two monkeys were sacrificed 3, 6 and 9 months after operation and prepared for histologic and histometric evaluation. Reentries were performed while the other 2 monkeys were terminated 11 months after operation. RESULTS: Histologic evaluation revealed that new connective tissue attachments were found to a greater extent in the 3-walled periodontal osseous defects treated with teflon membranes compared with the non-membrane sites (p = 0.05). More periodontal regeneration was not predictably obtained in the surgically created 2-walled osseous defects when the teflon membranes were used. CONCLUSIONS: For 3-walled periodontal osseous defects, guided tissue regeneration was superior to conventional periodontal flap surgery. For 2-walled defects, new connective tissue attachment could not be predictably achieved.

Alveolar Bone Loss↗
PubMed1993

Pathological findings in dicephalus dipus dibrachius: implications for mechanisms in two pairs of lateral conjoined twins.

The anatomical and pathological features of two pairs of dicephalic conjoined twins (case 1 and 2) are described. Both twins showed duplicitas lateralis representing diprosopus dipus dibrachius. There were two complete heads on two necks, one thorax, one abdomen and externally normal two arms and two legs. Case 1 showed dicephalus with anencephaly, two vertebral columns and two spinal cords, which converged from the thoracic region distally. The esophagus, stomachs and partial small intestines were duplicated, which fused at yolk sac (with Meckel's diverticulum). The heart was incompletely fused. The lungs and trachea were doubled. Two spinal cords were fused from the thoracic region caudally and showed myelomeningocele and Arnold-Chiari malformation in case 2. Two larynxes and two thracheas connected with the incompletely fused three lobes of lungs. The conjoined lungs were hypoplastic. The heart was single, showing ventral septal defect, transposition of great arteries, two cuspid aortic valves and preductal aortic coarctation. The duplicated esophagi were conjoined in Y-shape and single stomach, duodenum, intestine and colon were found. There were pairs of kidneys, adrenal glands and ureters and single female genitalia in both cases. These findings indicate that the craniocaudal paleoaxes were separated in the cranial region and converted or fused under the thoracic region like a Y-shape. Further development defects and deformations might be important factors to form malformations in these case.

Adult↗
PubMed1993

[Multi-layer musculo-aponeurotic repair in the treatment of patients with extensive median abdominal hernia].

A modified method for hernioplasty consisting in performance of multi-layer reconstruction of the abdominal wall with transfer and implantation of one of the cuspids of the hernial sac tissues beyond the contralateral musculus rectus abdominis has been suggested. Operated on were 20 patients with extensive, or giant abdominal hernia. Within 2 years after the operation, no hernia recurrence was noted.

Abdominal Muscles↗
PubMed1993

[Aortic regurgitation developed seven years after mediastinal radiation therapy: report of a case].

We report on radiation-induced valvular dysfunction in a 41-year-old woman who developed aortic regurgitation with clinical symptoms, requiring aortic valve replacement seven years after mediastinal radiation therapy for carcinoma of the breast. She was treated with cobalt radiation therapy of 4000 rads to her left mediastinum. The excised three-cuspid aortic valve was edematous and densely fibrotic without commissural fusion. Histological examination strongly suggested that the aortic valve with diffuse fibrosis, destruction of elastic fibers and bizarre nucleus in fibroblasts had been induced by mediastinal radiation therapy. To our knowledge, symptomatic radiation-induced valvular dysfunction in the aortic position has been reported infrequently, with only eleven reported cases. In this case, symptomatic aortic regurgitation was diagnosed seven years after mediastinal radiation therapy. It is emphasized that long-term follow-up is important for patients receiving mediastinal radiation therapy.

Adult↗
PubMed1993

Mechanical monitoring of fracture healing using ultrasound imaging.

Ultrasound scanning is based on biologic noninvasive use of high-frequency sonic vibration ultrasounds to obtain images of diagnostic relevance in vivo. Ultrasound scanning was used as an additional parameter in evaluation of healing of long bone fractures in patients treated by external fixation devices. Ultrasound image morphology is directly correlated to consolidation of fracture site and displays characteristic cuspid-like shapes in relationship to callus remodeling in response to axial forces. The intensity of reflected echo and the visualization of the longitudinal artifacts structure are significantly related to the calcification process of the periosteal apposition in relationship to healing time. Strain-recorded maximal values variations are synchronous with the variations of reflected echo demonstrating a correlation between the ultrasound image and mechanical status of external callus. In the current state-of-the-art, no quantitative evaluation of mechanical status of fracture site is possible by ultrasound technique alone.

Bony Callus↗
PubMed1995

Orthodontic management of a horizontally positioned maxillary lateral incisor.

A case report of a patient who had lost her maxillary permanent left central incisor, left cuspid and left first premolar teeth due to a cyst operation, is presented. The maxillary permanent left lateral incisor was in horizontal position high in the vestibule. She was treated with removable and fixed orthodontic appliances. The lateral incisor was uprighted and brought into its normal position in the dental arch. For aesthetics and function missing teeth were replaced with a specially designed prosthesis.

Child↗
PubMed1996

A longitudinal study of dental health in a group of Swedish teenagers/young adults from the age of 14 to 25.

87 participants were followed from the ages of 14 to 25. Data concerning dental caries, gingival status, pocket depth, subgingival calculus, loss of attachment, and regularity of dental care were recorded. During the 11-yr-study-period 16% of the participants did not develop any carious lesions at all, and the average increase in DMFS-value was 0.6 per year. At age 25, about 75% of the subjects had never experienced any manifest carious lesions in incisors or cuspids or on any buccal and lingual surfaces, and 30% had never needed any proximal restorations. Over the study period, gingival inflammation changed from being merely a result of poor oral hygiene to being an indication of initial periodontal disease, and at age 25, 11% showed evidence of loss of marginal bone. The Dental Health was better in females than in males. In general, this sex differences increased in age, and at the age of 19 it had become clinically significant. The good habit of regular dental care reinforced during these 19 years of life was continued by 91% at 25, and no difference could be seen between the care rendered by the Public Dental Health Care system and by Private General Practitioners.

Adolescent↗
PubMed1996

Regional odontodysplasia: review of the literature and report of a case.

Regional odontodysplasia is a rare and unique dental developmental anomaly that affects tooth morphogenesis. This case is unusual in that it involved the mandibular dentition. However, in this case the mandible was unilaterally involved. The presence of an abscess in relation to the lower right first permanent molar, in the absence of deep caries or periodontal pathology was an interesting finding. The radiographic appearance of bizarre pulpal morphology with high pulp horns extending to the occlusal surface would provide an open communication between the pulpal tissue and oral cavity. The importance of the first permanent molar as a strategic tooth was recognized and an apexification procedure was performed. The care and treatment of a child with odontodysplasia requires a multidisciplinary approach. In this case the right lower primary cuspid and first primary molar had been extracted previously. The early extraction of these teeth and the subsequent delay in hard tissue formation and eruption of the permanent successors could have resulted in altered growth of the alveolus in this region.

Child↗
PubMed1996

Direct bonding in diastema closure--high drama, immediate resolution.

Aesthetic rehabilitation in complex diastema closure cases is guided by the principles of proportion. The width to length ratio of the centrals must be pleasing. Achievement of this proper balance dictates treatment. It determines the following: 1) the amount of distal proximal reduction; 2) the decision to completely veneer the incisors vs. just adding to the interproximal; 3) the number of teeth to be treated; 4) the placement and location of naturally occurring prominences and concavities to create the illusion of a narrower tooth. The proper accommodation of these four topics will permit the maintenance or restoration of acceptable dimensions in the centrals. If they are made to appear harmonious then the principle of "golden proportion" (1.6:1:0.6) can be achieved among the centrals, laterals and cuspids. Direct bonding in diastema closure cases allow the dentist and the patient complete control in the formation of that smile. This treatment modality is challenging and ultimately rewarding for the patient and the dentist. At times it enables us to restore form and function and to make our patients whole again not just figuratively but literally.

Adult↗
PubMed1997

Optimizing multiple individual anterior implant restorations with a new generation implant-abutment system; IMZTwinPlus: a case report and treatment rationale.

A 53-year-old male with a history of initial oral facial trauma causing the loss of three maxillary incisors, multiple failures of tooth-borne fixed prosthetic reconstructions, and a resultant condition of structural failure of abutment cuspids and lateral incisor was to be retreated. The case contained numerous anatomic and dimensional constraints. The patient's desire to achieve a long-term, dependable prosthetic reconstruction prompted professional consideration of incorporating implants to lend structural support in the edentulous area. An extensive review of current implant-abutment options and their single-tooth implant replacement design and treatment rationales was conducted. The IMZ Generation III (IMZTwinPlus) implant system, a nonhex system, was chosen for treatment of the case of report to optimize mechanics, biomechanics, and esthetics for multiple individual-tooth implant replacement.

Biomechanical Phenomena↗
PubMed1997

Ectopic eruption of a mandibular lateral incisor.

This article illustrates an unusual situation, the ectopic eruption of the mandibular permanent lateral incisor, through the case report of a patient with a Class I malocclusion at an early stage of the mixed dentition. The article is focused on the diagnosis of the ectopic eruption and advocates treatment with an active orthodontic therapy at the early stage of the mixed dentition, before the eruption of the permanent cuspid.

Child↗
PubMedDate not supplied

Higher levels of orthodontic and dental excellence.

In the past, providers of orthodontic services were solely concerned with esthetic/cosmetic considerations of the teeth. In more recent years emphasis has been placed on the interdigitation of the teeth in centric occlusion combined with the absence of occlusal interferences in sliding/gliding jaw movements with the teeth in partial contact with each other (protrusive, cuspid disclusion, etc.). Still more recently true jaw function, or, function of the entire stomatognathic system, as opposed to the more limited functional movement of the teeth as influenced by their inclined planes when in partial occlusion, has come to the fore. And rightly so. This necessarily required consideration of the health or pathology of the temporomandibular joint/s because some patients could open their mouths more than others. Some opened straight up and down, while others deflected to the left or right and some made various noises and jerky movements. Others opened noiselessly and smoothly and were in moderate to severe pain and pointing their finger at the orthodontic provider.

Adult↗
PubMed1998

Loss of space and dental arch length after the loss of the lower first primary molar: a longitudinal study.

The premature loss of primary teeth may harm the normal occlusal development, although there are debates relating to the necessity of using space maintainer appliances. The aim of the study is to evaluate the changes in the dental arch perimeter and the space reduction after the premature loss of the lower first primary molar in the mixed dentition stage. The sample consists of 4 lower arch plaster models of 31 patients, within the period of pre-extraction, 6, 12 and 18 months after the lower first primary molar extraction. A reduction of space was of noted with the cuspid dislocation and the permanent incisors moving toward the space of the extraction site. It was concluded that the lower first molar primary premature loss, during the mixed dentition, implicates an immediate placement of a space maintainer.

Child↗
PubMed1998

[Congenital heart diseases in adults].

The experience of treatment of 45 adult patients with the innate heart diseases was summarized, 33 of whom were operated on. The interatrial septum defect closure was conducted in 14 patients, aortal valvotomy--in 1, the valve change for the twocuspid aortal valve (AV)--in 5, the aortal coarctation correction--in 3, the coronary arteries anastomosis formation with the coronary-pulmonary arterial fistula ligature--in 3, valvotomy or the balloon dilatation of pulmonary artery--in 2, septal myectomy for hypertrophic cardiomyopathy--in 2, the intervention on two- or three-cuspid valve or AV for the open left upper cava vein--in 2, AV in Marfan's syndrome--in 1. There were no postoperative mortality or complications. Of 8 nonoperated patients in 5 the cerebral blood circulation disorder have occurred, caused by paradoxical emboli. Thirty five year old woman with Eisenmenger syndrome have died. The patients with atresia of right pulmonary veins and fibrosis of right lung have survived up to the fourth decade of life.

Adolescent↗