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At least 217 records · Page 12Linked to original sources
PubMed1987

Tissue expansion reconstruction of soft tissue avulsions of the face: report of two cases.

A technique utilized to increase the amount of skin available for repair of soft tissue defects with local flaps has been described. Indications for the use of tissue espansion and the surgical technique and possible disadvantages have been discussed. Two case reports are presented to illustrate the use of the tissue expander to repair avulsive craniofacial defects.

Adult↗
PubMed1994

Sternoclavicular grafts for temporomandibular joint reconstruction.

This study evaluated the long-term outcomes of 52 sternoclavicular grafts for temporomandibular joint (TMJ) reconstruction in 38 patients. Patients were divided into three groups according to preoperative diagnosis and evaluated an average of 45 months (range, 10 to 84 months) postsurgery. Group 1 consisted of 14 patients (24 joints) with previous Proplast/Teflon implants (P/T; Vitek, Inc, Houston, TX;); successful reconstruction was achieved in only four patients (29%) and seven joints (29%). Group 2 included 10 patients (14 joints) with inflammatory TMJ pathology (non-P/T); success occurred in five patients (50%) and eight joints (57%). Group 3 consisted of 14 patients (14 joints) with non-P/T and noninflammatory TMJ pathology. Success in this group occurred in 13 patients (93%) and 13 joints (93%), with only one failure. The results of this study support the use of the sternoclavicular graft for TMJ reconstruction in a select group of patients and demonstrate a high failure rate in patients with previous P/T implants.

Adolescent↗
PubMed1995

A protocol for the management of failed alloplastic temporomandibular joint disc implants.

PURPOSE: This is a retrospective evaluation of a protocol for management of failed alloplastic temporomandibular joint (TMJ) disc implants. PATIENTS AND METHODS: The criteria for implant failure were defined as any one or combination of the following symptoms and signs: TMJ pain, jaw hypomobility, occlusal changes, and radiographic evidence of bone pathology related to the implant. The protocol consisted of removal of the implant, aggressive joint debridement, recontouring of the articulating surfaces, and placement of a pedicled temporalis muscle/fascia flap (TF) for joint lining. Arch bars and maxillomandibular guiding elastics were used if extensive condylar recontouring was necessary. No attempt was made to reconstruct the condyle or correct occlusal abnormalities at the time of implant removal. All 27 patients (42 joints) treated by this protocol during the study period were included for evaluation. There were 24 Proplast/Teflon (PTI) (Vitek, Inc, Houston, TX), 11 Silastic (SI) (Dow Corning, Midland, MI), and 7 Christensen Fossa implants (CFI) (TMJ Implants, Golden, CO) implants removed. RESULTS: The mean follow-up period was 38.3 months (range, 3 to 65 months). Pain was well controlled in 24 of 27 patients (88.9%). Preoperative and postoperative mean maximal incisal opening (MIO) was 32.1 mm and 39.8 mm, respectively. Two patients (7.4%) required a second TMJ operation for persistent pain and limitation of opening. To date, 7 patients (25.9%) have required a secondary procedure (unilateral vertical ramus osteotomy, n = 1; Le Fort I osteotomy, n = 6) to correct occlusal prematurity on the operated side or bilateral open bite. The remaining patients have required no additional surgical treatment. CONCLUSIONS: The results of this study indicate that a proposed protocol is an effective means of controlling pain and improving jaw motion in patients with failed alloplastic TMJ disc implants.

Adult↗
PubMed1981

Augmentation genioplasty as an adjunct to conservative orthodontic treatment.

Augmentation genioplasty can serve as a valuable adjunct to orthodontic treatment. The borderline extraction patient with a good nasolabial angle, protruding lower incisors and a deficient chin often can be treated better by nonextraction orthodontics followed by advancement of the chin than by any regimen involving orthodontic extraction. Genioplasty also can be used to improve facial esthetics in the patient with a short mandibular ramus in whom mandibular advancement might well lead to unstable results. In some instances, genioplasty may be a way to overcome the appearance of facial asymmetry without requiring jaw surgery which would complicate a pre-existing adequate occlusion. As a relatively straightforward and predictable procedure, augmentation genioplasty should be used more often in conjunction with orthodontic treatment than it has been in the past.

Adolescent↗
PubMed1999

The auxin-binding protein Nt-ERabp1 alone activates an auxin-like transduction pathway.

Hyperpolarization of tobacco protoplasts is amongst the earliest auxin responses described. It has been proposed that the auxin-binding protein, ABP1, or a related protein could be involved in the first step of auxin perception at the plasma membrane. Using for the first time homologous conditions for interaction between the protein Nt-ERabp1 or a synthetic peptide corresponding to the C-terminus and tobacco protoplasts, we have demonstrated that both can induce the hyperpolarization response. The results show that Nt-ERabp1 or the C-terminal peptide alone activates the auxin pathway from the outer face of the plasma membrane.

Amino Acid Sequence↗
PubMed1993

Update on the vitek partial and total temporomandibular joint systems.

A retrospective recall study was done on 262 VK I (N = 138) and VK II (N = 124) (Vitek, Inc, Houston, TX) partial and total temporomandibular joints placed between 1982 and 1990. The cumulative success rate of VK I total joints observed for up to 10 years was approximately 20%, whereas the success rate of VK II total joints observed up to 6 years was approximately 80%. At the 5- to 6-year interval for each, these rates were 44% and 79%, respectively. Wear of the Teflon fluorinated ethylene propylene polymer surface was the primary reason for VK I failure; there was no material failure of the VK II prostheses. Slightly better pain relief, increase in interincisal opening, improvement in diet, and greater overall satisfaction were noted with the use of VK II. A highly significant improvement in success data was found if no surgery had been performed before either VK I or VK II total joint placement. Rib grafts were not particularly helpful after removal of total joint prostheses, particularly if the patient had a history of multiple surgeries. Total temporomandibular joint surgery must be reserved for patients in whom alternative surgical methods have failed or are no longer indicated. All total joint implants, particularly the VK I, must be observed closely with clinical examination and imaging and removed at the earliest sign of material failure.

Adult↗
PubMed1986

Comparative study of alloplastic materials for temporomandibular joint disc replacement in rabbits.

Young adult, white New Zealand rabbits underwent either sham surgical procedures or discectomy. In the animals that underwent discectomy, either reinforced silicone or polytetrafluoroethylene-aluminum oxide (PTFE-Al2O3) implants were placed in the glenoid fossa. During gross sectioning, the silicone implants could be easily displaced from the specimen, while the PTFE-Al2O3 implants were firmly anchored. Histologically, fragmentation of the implants was seen in the silicone group; 21.4% of the implants placed were torn. Foreign body giant cell reactions reached a peak after eight weeks. Associated fibrosis and foreign body giant cell reactions were seen, resulting in a thickened capsule and resorption of the condyle and articular fossa. In the PTFE-Al2O3 group there was marked osteoclastic activity, with resorption and severe degenerative changes in both the condyle and glenoid fossa. The foreign body giant cell reaction was severe at all time intervals and increased with time. Tearing of the implant was observed in 46.2% of the joints. These results indicate a need for further evaluation of these materials as disc replacements in humans.

Aluminum↗