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At least 127 records · Page 7Linked to original sources
PubMed1992

Development of alloplastic materials for temporomandibular joint prosthesis: a historical perspective with clinical illustrations.

This paper gives the history of the development of alloplastic materials presently used in the temporomandibular joint (TMJ). It discusses the evaluation of TMJ implants, from those being used primarily for ankylosis to the more varied and sophisticated implant designs used today. There is a discussion on the treatment of osteoarthritis with implants and also a discussion on the use of TMJ implants to repair skeletal and dental malrelationships, primarily anterior open bites. Included is a presentation of the latest research by Schellhas et al., which establishes that previously undiagnosed organic disease in the joint proper is a common cause of skeletal and dental malrelationships and that TMJ disease can cause malocclusion.

Adult↗
PubMed1993

Histiocytic lymphadenitis associated with a large joint prosthesis.

Distinctive microscopic findings in enlarged axillary lymph nodes removed during modified radical mastectomy in a 76-year-old woman with a previous ipsilateral total shoulder joint replacement are described. The sinuses of the lymph nodes were distended by numerous large macrophages that had abundant granular eosinophilic cytoplasm. Periodic acid-Schiff staining was positive, and polarization microscopy revealed birefringent particles of polyethylene. These findings were diagnostic of the reactive lymphadenopathy that is seen uncommonly in lymph nodes draining large joint prostheses.

Aged↗
PubMed1991

Ion implantation effects on friction and wear of joint prosthesis materials.

The literature contains many results from in vitro friction and wear tests for simulating the behaviour of human joint prostheses. However, they are difficult to correlate, even when they are not contradictory. In friction tests, several friction-mechanisms occur when the Ti-6AI-4V titanium alloy rubs against the UHMWPE polyethylene. Corrosion effects which increase wear happen when the 316L stainless steel is used in Ringer's solution. Ion implantation surface treatments have been performed on these three materials. When the operating conditions were optimized, an important reduction of wear and corrosion was observed. The property improvements are due to structural modifications in a thin layer of the materials.

Alloys↗
PubMed2003

Comparison of 2 temporomandibular joint total joint prosthesis systems.

PURPOSE: The study goal was to evaluate the comparative outcomes of patients treated with temporomandibular joint (TMJ) total joint prostheses, using either the Christensen prosthesis (TMJ Inc, Golden, CO) (CP) or the TMJ Concepts prosthesis (TMJ Concepts Inc, Camarillo, CA; formerly Techmedica Inc) (TP). PATIENTS AND METHODS: Forty-five consecutive patients treated with either CP or TP total joint prostheses were evaluated. The CP group consisted of 23 patients (40 prostheses; average patient age, 38.8 years). The TP group consisted of 22 patients (38 prostheses; average patient age, 38.5 years). The average number of previous operations for the CP group was 3.9, whereas it was 2.6 for the TP group. The CP and TP groups had an average follow-up of 20.8 and 33.0 months, respectively. Patients were evaluated for incisal opening and occlusal and skeletal stability. A visual analog scale was used for subjective assessment of TMJ pain (0 = no pain, 10 = worst pain), jaw function (0 = normal function, 10 = no function), and diet (0 = no limitations, 10 = liquids only). Statistical analysis was performed using an independent t test, and a value of P <.05 was considered significant. RESULTS: The average postsurgical incisal opening for the CP group was 30.1 mm (increase of 6.7 mm), and that for the TP group was 37.3 mm (increase of 9.9 mm), indicating significant increase of the TP group (P =.008). The average postsurgical pain level for the CP group was 6.0, a decrease of 1.8, and that for the TP group was 4.1, a decrease of 3.1, indicating significant improvement for the TP group (P =.042). Postsurgical average jaw function for CP was 5.5, an improvement of 1.2. The postsurgical TP average was 3.9, an improvement of 3.0, showing significant improvement for the TP group (P =.008). Average postsurgical diet rating for the CP group was 5.4, an improvement of 1.8. The TP group average was 3.9, an improvement of 2.0, indicating significant improved eating ability for the TP group (P =.021). Skeletal and occlusal stability were good in both groups. CONCLUSION: The TP group had statistically significant improved outcomes compared with the CP group relative to postsurgical incisal opening, pain, jaw function, and diet. Both groups showed good skeletal and occlusal stability.

Adolescent↗
PubMed1990

[A complete intermediate temporomandibular joint prosthesis. Evaluation after 6 years].

Since 1983 we have inserted more than 100 temporomandibular joint prostheses. A review after 6 years allows the respective indications to be listed and the complications to be studied in 72 insertions involving 62 cases suitable for analysis. The prosthesis is a total intermediary prosthesis forming an unsealed cupula composed of 2 halves--a mandibular portion and a temporal portion. Insertion of the prosthesis requires preliminary facial nerve dissection then osteotomy of the mandibular condyle and its subsequent drilling to allow the screwing in of the prosthesis. The prosthesis was used in traumatology, in condylar and high sub-condylar fractures, in the event of failure of functional treatment, in malformation syndromes, in tumors and, finally, in degenerative pathology. 13 prostheses were removed. A study of the probable causes of complications shows a predominance of technical problems related to inaccurate positioning of the prosthesis, in that it was not placed in the axis of the condyle, or that inadequate bicortical support was present. In our opinion, these complications do not question the conception of the prosthesis but rather indicate that it is necessary to perfect the insertion technique while taking advantage of improvements in the prosthesis which are currently under study.

Ankylosis↗