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Biomedical subjects

T Jemt

Publications and source records attributed to T Jemt.

At least 55 records · Page 3Linked to original sources
PubMed1990

Oral function in patients treated with prostheses on Branemark osseointegrated implants in partially edentulous jaws: a pilot study.

To study the oral function of partially edentulous patients treated with fixed prostheses on osseointegrated implants, recordings of the masticatory efficiency and occlusal perception of thickness were performed. The retrievable fixed partial prostheses were used to study the immediate impact of reduced fixed occlusal support on masticatory efficiency. The masticatory efficiency was subjectively satisfactory but objectively lower when compared to naturally complete dentate persons. Furthermore, the immediate impact of reduced fixed occlusal support was compromised masticatory efficiency, which was more pronounced when the occlusal support was removed on either side.

Aged↗
PubMed1990

Clinical evaluation of angulated abutments for the Brånemark system: a pilot study.

Where fixture placement and inclination had not been optimal from a restorative perspective, angulated abutments were used to overcome compromised esthetic and functional results in situations of complicated anatomy. The angulated abutment is a treatment adjunct that provides flexibility for ensuring successful treatment when a variety of reconstruction problems are confronted.

Dental Abutments↗
PubMed1989

Biting forces in patients with craniomandibular disorders.

Treatment for 10 female patients having craniomandibular disorders of neuromuscular origin showed a reduction in dysfunctional symptoms and improvement in their condition. In response to treatment, a standardized recording method was used to measure alterations to bite force values. In about 60 percent of categories representing various positions in the dental arch from which maximal and submaximal biting forces were measured, there was significant variation between replicate registrations. This persisted after treatment, indicating some loss of sensory acuity for fine bite-force adjustments in these patients. Discriminatory ability for large force adjustments was not, however, observed to be affected. Bite force values showed considerable fluctuation both before and after treatment. The lack of substantial increase in force values after a reduction in muscular dysfunction with treatment appears to suggest that an inhibitory mechanism controlling jaw-closing activity and pressure persists as a protective reflex for these patients.

Adult↗
PubMed1989

Osseointegrated implants in the treatment of partially edentulous patients: a preliminary study on 876 consecutively placed fixtures.

A total of 876 consecutively placed fixtures ad modum Brånemark was followed in 268 partially edentulous jaws of 244 patients treated between April 1968 and the end of December 1988. A total of 24 of 712 fixtures exposed at the abutment connection was lost (3%); the continuous prosthesis stability rate was 98.7%, as only four of 293 prostheses were removed. The results of the study indicate the possibility for the Brånemark osseointegration technique also to be used in the treatment of partial edentulism.

Adolescent↗
PubMed1989

Forces and moments on Branemark implants.

The placement of fixtures (implants) in relation to the geometry of a prosthetic restoration has a great influence on the mechanical loading of the implant. Based on theoretic consideration and clinical experiences with the Brånemark System, this article gives simple guidelines for controlling these loads. The emphasis is on design rules that can be used in clinical practice. With the Class I lever as a reference, various clinical implant prosthesis situations are discussed and evaluated.

Bite Force↗
PubMed1988

Oral function in subjects with overdentures supported by osseointegrated implants.

Nine subjects treated with overdentures on osseointegrated implants in the mandible were functionally evaluated before and after treatment. The last recordings were performed 1 yr after treatment. The evaluation comprised a subjective and a clinical examination. Measurements of bite force and of chewing efficiency were also performed. The bite force was measured during gentle biting, biting as when chewing and biting with maximal effort. Almonds were used as test food. All subjects improved subjectively as well as clinically after treatment. The bite force during gentle biting increased on average from 17.3 N before treatment to 24.0 N 1 yr after treatment. A corresponding improvement of biting as when chewing was also found, from on average 24.0 N before to 38.7 N after treatment. The maximal bite force increased from on average 74.6 N at the baseline examination to 131.5 N at the 1-yr follow-up. The chewing efficiency improved from Ci = 4 (Median value) before treatment to Ci = 2.8 (Median value) after treatment. It is concluded that treatment with an overdenture supported by osseointegrated implants in the mandible improves oral function compared to the situation before treatment.

Aged↗
PubMed1987

Responses and evaluation of patients with temporomandibular disorders in relation to conservative treatment.

The main purpose of the study was to evaluate the pattern of response of an identified subgroup of patients having clinically diagnosed myofascial pain dysfunction of the stomatognathic system to conservative methods of treatment. 10 affected female adults fulfilling the criterion for selection, were allowed to undergo a closely-monitored treatment regime and evaluated on two occasions, employing accepted clinical indices for gauging the severity of the condition. The patients had clinical features of dysfunction graded as moderately severe to very severe. Evaluation showed that severe symptoms were ameliorated for 4 subjects thus affected. Moderate to marked improvement in condition was observed in 6 cases out of the 10 subjects investigated over the 5 to 8 weeks of therapy. The patients showed an encouraging interim response to treatment and their prognosis in general appeared fairly good.

Adult↗
PubMed1986

Changes in masticatory movement parameters within the chewing period in young dentate persons and patients rehabilitated with bridges supported by implants in the mandible.

Experiments were carried out to study changes in masticatory movements in the chewing sequence of young dentate persons and complete denture wearers rehabilitated with bridges on osseo-integrated implants (OIB) in the lower jaw. Two test foods were used in the dentate group (apple, bread) and bread in the OIB group. A computer-based opto-electronic system (Selspot) was employed to record and analyse all single chewing cycles, regarding parameters reflecting, chewing rhythm, mandibular velocity and displacement. The different parameters were tested both intra- and inter-individually versus the series of the single and overall chewing cycles in the masticatory sequences respectively. The results indicated that different subjects performed different patterns of mastication within the chewing period when chewing the same type of food. Different test foods (texture, size) also seemed to affect the chewing pattern in a different way, e.g. mandibular displacement showed an obvious reduction when chewing apple, probably due to the bigger size of the bolus. The inter- and intra-individual analysis showed in some parameters discrepancies implying problems in analysing the chewing pattern within the chewing sequence without using both methods.

Adult↗
PubMed1986

Aspects of mastication with bridges on osseointegrated implants.

Sixteen edentulous patients were examined before and 2 months after rehabilitation with fixed bridges supported by fixtures in the mandible. Data were collected regarding bite force, chewing efficiency, chewing movements and self-estimated chewing ability. The results after rehabilitation indicated that patients with an obvious improvement of chewing efficiency showed a greater increase of the mean bite force parameters than patients with unchanged chewing efficiency. However, it was not possible to find any definite pattern of differences between the groups of patients, based on the chewing efficiency index after rehabilitation. Furthermore, after rehabilitation the test group revealed a positive correlation between the duration of the occlusion phase and bite force values, negative correlations between bite force "as when chewing" and closing velocity and between duration of the occlusion phase and opening mandibular velocity and displacement, respectively.

Adult↗