Breakaway forces of flat and domed surfaced Magfit implant magnet attachments.

The aim of this in vitro study was to compare the resistance to separation (breakaway force) of flat (Magfit-IP-BF) and domed (Magfit-IP-BD) implant magnet attachments subjected to non-axial forces. The separating forces were applied by an Instron Universal Testing Instrument to single magnet attachments at angles of 0 degrees, 2 degrees, 5 degrees 10 degrees, and 20 degrees from the axial line of the components (angle of pull) and at crosshead speeds of 0.5 mn/min and 5 degrees mm/min. The breakaway forces were significantly (p < 0.0001) inversely related to the angle of pull for both flat magnets and for domed magnets. At the slow crosshead speed, the breakaway forces recorded for the domed magnets were significantly greater than those recorded for the flat magnets for angles of pull greater than 5 degrees. At the faster crosshead speed, the breakaway forces recorded for the domed magnets were significantly greater than those recorded for the flat magnets for angles of pull greater than 2 degrees. This apparent superiority of domed magnets under non-axially directed separating forces could influence the choice of magnet attachment for implant overdentures as intraoral displacing forces are multidirectional. Domed magnets may also be advantageous where implants are not parallel.

Telescopic prostheses for implants.

This retrospective study investigated the outcome of 73 telescopic implant-supported fixed prostheses. Fifty-four prostheses were entirely cement-retained, and 19 incorporated a screw-clamping unit. The rate of complications was low and in most cases minor in nature. Cement-retained prostheses involving a distal cantilevered extension required the greatest postoperative maintenance. Despite the small number of combined screw- and cement-retained prostheses, the lack of complications and ease of retrievability make this approach worthy of further study.

The DIA anatomic abutment system and telescopic prostheses: a clinical report.

Implant-supported prostheses may benefit from the versatility of design and favorable appearance offered by telescopic restorations. This project investigated the effectiveness of 208 abutments designed and produced by Dental Imaging Associates and the 73 prostheses supported by them over a 2-year period. No complications were found in the single-tooth group, although the sample was small (n = 7). Only 8.17% of the 208 abutment screws became loose during the initial postloading period. Once retightened, 2.4% of the total loosened for the second time. Higher screw-loosening rates were found in maxillary restorations, while the inclusion of a distal cantilevered pontic produced a significant increase in maintenance requirements.

The implant in prosthodontics today--a personal viewpoint.

Implants in prosthodontics have come a long way in the last 15 years. General dental practitioners today perform procedures that were once carried out only by highly trained specialists, and the subject is now taught to undergraduates in some dental schools. Harold Preiskel looks at the current techniques used in implantology and gives advice from his wealth of first-hand experience.

Occlusal variables, bruxism and temporomandibular disorders: a clinical and kinesiographic assessment.

Seventy-five patients suffering from myofascial pain, headaches and anterior disc displacement were assessed clinically and with a kinesiograph. Twenty-eight asymptomatic dental staff served as a control group. The prevalence of awareness of bruxism was significantly greater in our TMD patients than the controls. Bruxism patients recorded a higher prevalence of incisor dentine wear suggestive of a forward mandible posture. Class II, Division 1 malocclusions formed a significantly higher proportion of the TMD patient group than the controls. Kinesiographic recordings showed that the vertical and lateral components of movement from postural position to intercuspal were significantly greater in the patient group.

Treatment outcomes in implant therapy: the influence of surgical and prosthodontic experience.

In this retrospective study reviewing 30 months of treatment, 53 partially or completely edentulous patients were provided with implant-supported restorations. The restorative aspects of the therapy were undertaken by an experienced prosthodontist who had just begun involvement with implant rehabilitation techniques. Patients were treated in two centres, 21 in a major teaching institution (Group A) and 32 in a private practice (Group B). In Group A, the implants were placed by experienced oral and maxillofacial surgeons just beginning involvement in implant techniques. The implants of the Group B patients were placed by surgeons with a minimum of 2 years implant experience. It appeared that the surgeon's experience had a major impact on the failure probability of unloaded implants. Loading conditions and the design of the prosthesis may be the decisive determinants for the probability of success with loaded implants. The hazards of extensive cantilevered extensions were demonstrated. The results suggest that those entering implant prosthodontics should not expect their early work to match the results obtained from established centres.

A controlled clinical, electromyographic, and kinesiographic assessment of craniomandibular disorders in women.

Clinical, electromyographic, and kinesiographic methods were used to evaluate 35 female patients presenting with craniomandibular disorders. Twenty-six similarly aged, symptom-free women served as controls. Clinical assessments showed that the patients demonstrated a higher prevalence of bruxism than did the controls. Electromyographic results suggested that the rest activity of patients' elevators was significantly greater than that of the controls. Kinesiographic measurements showed that the patient group demonstrated greater vertical and anterior posterior movements from rest to centric occlusion than did the control group, and both the average and maximum opening velocities were smaller in patients than in controls.

Kinesiographic and electromyographic assessment of the effects of occlusal adjustment therapy on craniomandibular disorders by a double-blind method.

Fifty-one patients with craniomandibular disorders were divided into two groups. One group underwent mock occlusal adjustment, the other was treated with adjustments to remove significant slides and nonworking-side interferences. Both groups received identical counseling. Kinesiographic and electromyographic assessment showed no significant difference between the two groups.

Occlusal adjustment therapy for craniomandibular disorders: a clinical assessment by a double-blind method.

Fifty-one patients with craniomandibular disorders were divided in two groups. One group underwent mock occlusal adjustment, the other was treated with adjustments to remove significant slides and non-working side interferences. Both groups received identical counseling. The results show that there was no significant difference in the improvements on the signs and symptoms obtained by real or mock adjustments after the first treatment session.

A laboratory assessment of recording reliability and analysis of the K6 Diagnostic System.

This laboratory study investigated the recording reliability and analysis of the K6 Diagnostic System, a computerized instrument that records mandibular movements in three planes. Two special devices were utilized for this purpose, one commercially available and the other designed and constructed by the authors. These devices could produce linear movements and simulate head and mandibular movements, respectively. The largest distortion of the simulated mandibular movements was found in the frontal plane tracings of simulated chewing patterns. For the linear movements in an x-axis, the error of the analyzed K6 system ranged from 9.4% to 30% and in a z-axis from 0% to 15%. A considerable degree of head movement was required to produce a significant error on the K6 measurements.

Double-blind placebo-controlled comparison of the analgesic effects of single doses of lornoxicam and aspirin in patients with postoperative dental pain.

The pain experienced after third molar surgery was used as a model to evaluate the analgesic efficacy of a new non-steroidal anti-inflammatory drug, lornoxicam, in a Phase II study. One hundred and fifty fit, young adults participated in this randomised, single dose, double-blind, parallel group clinical study. Three doses of lornoxicam (2 mg, 4 mg, and 8 mg) were compared with aspirin 650 mg and placebo. Patients suffering from moderate to severe pain following surgery were monitored for up to 8 hours. All indices of efficacy showed similar results, all active treatments being associated with highly significant (P less than 0.0001) reductions in pain during the study period. Lornoxicam 8 mg demonstrated significant analgesic efficacy as compared with placebo. The two lower doses of lornoxicam and aspirin all showed apparent degrees of efficacy intermediate between that of placebo and lornoxicam 8 mg, although the trial proved to have inadequate power to show significant differences between these three treatments. Lornoxicam was very well tolerated at all three doses studied, with no adverse events definitely attributable to its administration.

Retention profiles of stud-type precision attachments.

This study measured the retention profiles of 11 commercially available stud-type attachment systems suitable for use with overdentures. The vertical distance over which resistance to separation existed was recorded and related to the configuration of the attachments. In many of the systems tested, only a small portion of the vertical length of the attachment contributed to the retention of the unit.

Effect of the major connector on abutment tooth and denture base movement: an in vitro study.

This in vitro study investigated the effect of the major connector on distal abutment tooth and denture base movements when loads were applied to a partial denture with extracoronal attachments. A brass mechanism was constructed for load application, and the abutment and base movements were measured in three planes using a kinesiograph. It was determined that cutting the major connector affected the degree of abutment tooth movement but not the direction. After cutting the major connector, the base movement increased in all three planes with the different forces applied. The direction of the base movement changes only in the buccolingual plane.

Abutment teeth with extracoronal attachments: the effects of splinting on tooth movement.

This in vitro study investigated the effects of splinting on abutment tooth movement when loads were applied to a removable partial denture framework with extracoronal attachments. The abutment tooth movements occurring in the vertical, frontal, and sagittal planes were measured with a kinesiograph modified for the purpose. It was demonstrated that splinting abutment teeth resulted in a significant decrease in the mesiodistal and buccolingual movements of the distal abutment under vertically applied loads. The direction of the abutment tooth movement was related to the type of loading and was unaffected by splinting. Bilateral loading produced significantly less movement of the single abutment tooth mesiodistally and buccolingually than unilateral loading.

Ataches de precisión en odontología

Prefacio. Reconocimientos. Plan de tratamiento. Las superficies oclusales. Prótesis sin pilar posterior. Ataches prefabricados. Ataches intracoronados. Ataches extracoronarios. Ataches internos. Barra ferulizadora para soporte de prótesis. Ataches auxiliares. prótesis seccionadas