Clinical follow-up evaluation of Dalbo®-Rotex® retention elements in the private practice.

The aim of this retrospective study was to investigate the clinical outcome of Dalbo®-Rotex® retention elements in a private practice. The majority of the retention elements was fixed with self-adhesive composite cement, and in almost 40% the exposed root surface was additionally covered with composite. The success rate of 96.

[Zirconia in removable prosthodontics. A case report].

Zirconia as a framework material is well established in fixed prosthodontics. However, for its application for removable dentures little experience exists. Zirkonzahn® has developed a copy-milling unit, that is a manually operated machine for the manufacture not only of frameworks but also of complete removable dentures.

[Navigated implant placement using a bone supported CT-guided surgical template. Case report].

Surgical navigation allows precise implant placement and minimizes the risk of interferences with anatomical structures. Computerized implant planning based on tomographic data can be clinically realized by surgical templates. These are normally produced by stereo lithographic rapid prototyping.

[Low-cost simple anchorage systems in the removable hybrid prosthesis. Locator Root Attachment and Würzburg post].

For a simple and provisional retention of a removable prosthesis, less expensive direct retainers are an option compared to indirect cast gold copings with attachment. The Dalbo-Rotex-retainer and the Ticap-system are clinically established. The Locator Root attachment and the Würzburger Stift were recently introduced.

[The interdisciplinary fixed restoration of an edentulous maxilla with a marked resorption of the alveolar crest. A case report. Part II: the definitive restoration].

Different materials and methods can be used for edentulous maxillae rehabilitations. A precise fit between the implant and the framework is assumed. Hence, often implant suprastructures made by conventional lost wax techniques lack such a fit and a secondary modification is necessary.

[The interdisciplinary fixed restoration of an edentulous maxilla with a pronounced resorption of the alveolar crest. A case report. Part I: The immediate reconstruction].

Edentulous patients wearing a conventional complete denture often request a fixed restoration for functional, esthetical and/or psychosocial reasons. For these patients implant-supported fixed dental prostheses are a prosthetic means of choice. However, after years of edentulism often a marked resorption of the alveolar crest has taken place, asking for bone augmentation before implant placement.

[The prosthetic rehabilitation of a patient after gunshot wound and initial maxillofacial surgical reconstruction. A case report].

An improvement of prognosis after tumour therapy as well as a rather high number of multiple traumas in the craniofacial area imply a high treatment need for craniofacial tissue defects. For a successful rehabilitation of these individuals, reconstructive oral and maxillofacial surgery and prosthodontics must collaborate closely and synergistically. Besides medical and psychological findings, functional and esthetical aspects need to be taken into account.

[Esthetic and technical aspects of conventional removable dentures. Design of a complete denture in the upper jaw and a telescopic denture in the lower jaw. A case report].

Removable partial dentures and complete dentures are still an important part of the daily prosthetic work of dentists and dental technicians. Thereby the esthetic design of conventional fixed restorations is challenging the dentist and the dental technician in removable prosthodontics. The result is mainly influenced by the clinical and technical procedure as well as by the choice of material.

[Determination of prospective tooth positions by means of model analysis--the Staub Cranial System].

In modern reconstructive dentistry, practitioners delivering removable or fixed dentures still face problems when determining prospective tooth arch and tooth positions. Certain anatomical planes and reference lines, such as Camper's plane, interpupillary axis, etc. have been established as a guide.

[The well-established Dalbo-Rotex-retainer and the newly developed Ticap-system. Low-cost anchorage possibilities in the removable prosthesis].

Conventional retainers for removable prostheses are frequently used in the daily practice. Financial limits, physical and mental restrictions especially among elderly or disabled patients, and/or limited prognosis of abutment teeth may require simple and less expensive alternatives. For these indications the well-established Dalbo-Rotex-retainer and the newly developed Ticap-system are available.

[Pathomechanical aspects of intra-articular calcaneus fractures. Typing, grading and surgical therapy].

The forces to produce fractures of the os calcis are combined compression and shear under a cranio-caudal impulse of 10-40 kN and a short time of stroke about 10-40 ms. The main patterns in biomechanics of calcaneal fractures are the time of stroke and the geometrical position of the foot in the moment of impact. Furthermore individual structural changes of the calcaneal cancellous bone, age, diseases as Diabetes mellitus and vascular obliterations are to be respected.

[Kinematics of the pelvis. Grading and pathomechanical classification of injuries of the pelvic joints and kinematic and clinical consequences of surgical management].

The concept of kinematics as an idea basic to the operative and non-operative treatment of pelvic trauma, whether a fractures or a pelvic joint dislocation, is gaining ground in thinking and in technical management. The human pelvic ring may be interpreted by kinematic aspects as a three-bar linkage moving with three bony links (sacrum and both ossa coxae), (n = 3), in three real joints (symphysis pubis and both sacroiliac joints, (g = 3), as a transformer of great forces into small movements, and as a halter under periodic oscillating femoral impulses. The closed kinematic chain of the symmetric pelvic girdle possesses eight degrees of freedom (sigma g f = 8) subject to two external parameters of influence (F = 2), the gravity exerted by the trunk acting on the sacrum as a driving link caudally and ventrally, jointly creating a ring tension inside the pelvis.

[kinematic consideration of the shoulder girdle and its consequences on common surgical methods].

Motility of the upper extremities is the sum of movements of an open kinematic chain made up of the hands and the lower and upper arms in the humero-scapular joints which are integrated in the closed kinematic chains of the bilateral symmetrical shoulder girdles. Each shoulder girdle assembles three kinematic links (scapula, clavicle, hemithorax), with three joints (sternoclavicular, acromioclavicular, thoraco-scapular), creating a three-bar linkage. This linkage may be characterized as an effective transformer of motion with 11 degrees of freedom ensuring wide ranges of motions.

The effect of prolonged fluoride therapy for osteoporosis: bone composition and histology.

To examine the long-term effects of fluoride therapy in osteoporosis, we obtained iliac crest biopsies from 11 osteoporotic patients 6 to 12 years after they had started fluoride therapy. Although basal biopsies were not obtained, nine subjects had been biopsied 4 years prior to the second biopsy. In addition, 4 subjects had stopped fluoride therapy prior to the second biopsy.

Low molecular weight proteinuria exacerbates experimental ischemic renal injury.

To determine whether tubular reabsorption of low molecular weight proteins (LMWPs) alters ischemic tubular injury, rats were infused with 25 mg of lysozyme (isoelectric point (pI) 11.3), cytochrome C (pI 10.6), ribonuclease (pI 8.

The role of skeletal calcium deficiency in postmenopausal osteoporosis.

A previous study of iliac crest composition identified skeletal calcium deficiency in 25% of 56 postmenopausal osteoporotic patients evaluated prior to the use of stanozolol or calcitonin. This report is a follow-up of biopsy data after 2 years of treatment with drug or placebo in 31 patients, 11 of whom had skeletal calcium deficiency. The study diet, consisting of 1 g elemental calcium plus 400 U Vitamin D, repaired the skeletal calcium deficiency in all patients, treated and untreated alike.

Effects of dietary alteration of bicarbonate and magnesium on rat bone.

To study the effects of bicarbonate and magnesium on bone, mild acidosis and/or hypermagnesemia were produced in growing rats by feeding ammonium chloride and/or magnesium sulfate. Bone composition, quantitative histomorphometry, and mineral x-ray diffraction (XRD) characteristics were measured after 6 wk of treatment. The results demonstrated that both acidosis (decreased HCO3) and hypermagnesemia inhibited periosteal bone formation, and, when combined, results were summative; and the previously observed in vitro role of HCO3- and Mg2+ as inhibitors of crystal growth were confirmed in vivo.

[Biomechanical analysis of the medullary bone nail and its locking].

By mechanical definition an intramedullary nail is not a nail but rather a bendable feather, subject to longitudinal tension and to a lesser degree to transverse pressure. Reaming the medullary canal is necessary for centralization of the nail as well as to increase the area of contact with the bone. However, this procedure is detrimental to the bone metabolism and reduces its elasticity against torsional forces.

[Comparative implant analysis in the operative treatment of unstable per- and subtrochanteric femoral fractures and results of 300 osteosyntheses with the 130 degree double T plate].

We have found that the 130 degrees-Double-T-Plate, when used to repair unstable intertrochanteric femoral fractures in patients in the eighth decade, where high morbidity (92%), osteoporosis and immobility is common, lowers the postoperative complication rate (8,5%), mortality rate (12%) hospital course (means = 24 days) and, last but not least, the total cost of medical care. The biomechanical superiority of these implants over others was shown by comparing moments of inertia, elasticity, bending strength, load capacity and spring constant. In 300 cases of unstable intertrochanteric femoral fractures treated with the 130 degrees-Double-T-Plate, 79% yielded very good to good results, 11% satisfactory results and 10% poor results.

[Biomechanics of intramedullary nailing and its interlocking].

Mechanically an intramedullary nail cannot be conceived of as a nail but rather as a bendable feather subject to longitudinal tension and, to a lesser degree, to transverse pressure. Reaming the medullary canal is necessary for centralizing of the nail as well as for increasing the area of contact with the bone. However, this procedure is detrimental to the bone metabolism, thus reducing its elasticity against torsional forces.

[Stable osteosynthesis of unstable per- and subtrochanteric femoral fractures using the 130 degrees double-T plate].

Operative treatment of instable inter- and subtrochanteric fractures with a new 130 degrees-double-T-plate allowed, in spite of high-risk patients (age x=81 to 84 years, multimorbidity 92%), full maximum load by the third day after operation and a shorter time of hospitalization of 22.5 days. Mortality rate came up to 9%.

Bone matrix and mineral abnormalities in postmenopausal osteoporosis.

Iliac crest biopsies from 56 postmenopausal osteoporotic females with spontaneous compression fractures and decreased total body Ca were compared to similar tissue from 48 normal controls. Biopsies were analyzed for bone density, Na, Ca, Mg, P, Co3, and hydroxyproline (OH-P). From the results OH-P/matrix, % mineral, and the ion content of the mineral were calculated.