Search PubMed⌕ Search

Biomedical subjects

P Bonding

Publications and source records attributed to P Bonding.

At least 19 recordsLinked to original sources
PubMed1992

The bone-anchored hearing aid. Osseointegration and audiological effect.

The results of treatment of the first 12 Danish patients with the Brånemark titanium implant system and the bone-anchored hearing aid (BAHA) are reported. All implants were osseointegrated, judged by 99mTC-scintigraphy, X-ray examination and clinical examination. Skin reactions were few, transient and short lasting. The patients experienced the BAHA to be superior to both conventional BC hearing aids and AC hearing aids in practically all respects. Speech discrimination scores in quiet and in noise were similar for the 3 types of hearing aids.

Adult↗
PubMed1992

Permanent, skin penetrating, bone-anchored titanium implants. A clinical study of host-reaction in bone and soft tissue.

In 12 patients with a skin penetrating retroauricular titanium-implant (Brånemark) the reaction in bone and soft tissue was studied. Observation time was 6 to 36 months. All implants were "osseointegrated", as assessed by repeated manual test, X-ray examination and 99mTC-scintigraphy. Soft tissue reactions appeared to be slight and clinically insignificant. However, all patients produced crusts around the abutment. When the abutment was removed varying degrees of inflammatory reaction in the skin penetration could be observed in most patients. A theory for the development and cause of the soft tissue reactions is proposed and changes in the operative procedure and the design of the abutment to reduce the host reaction are suggested. It is stressed that the clinical significance of this host reaction is uncertain and above all has to be weighed against the important benefits this implant system offers to a severely handicapped group of patients.

Adult↗
PubMed1990

[Permanent, percutaneous osseointegrated titanium implants. A review and preliminary results].

The present knowledge of the requirements for obtaining a stable percutaneous bone-anchored implant is reviewed. A Swedish implantation system, developed by Brånemark et al, is presented. The implants are made of titanium and the special design and manufacturing in combination with atraumatic operation technique in two stages assure that the implants are osseointegrated without interposed fibrous tissue. Soft tissue problems around the skin penetration are few and in most cases reversible. In the first seven Danish patients, implanted with the Brånemark-system for fixation of bone anchored hearing aid, stable osseointegration was achieved in all cases, judged clinically, radiologically and by 99mTc-methylene-diphosphonate scintigraphy of the cranium. In two cases brief, reversible soft tissue problems were present. The system has been shown to be most useful in otological rehabilitation, for fixation of bone-anchored hearing aids, and for fixation of prostheses of the external ear, eye or mid-face. The Brånemark-system has also been used in orthopaedic surgery, so far, however, only as endoprostheses, in particular for reconstruction of metacarpophalangeal joints.

Aged↗
PubMed1990

[Bone-anchored hearing aids. Preliminary results].

The bone conduction hearing aid is employed for patients who cannot tolerate treatment with air conduction hearing aids and for whom operation cannot offer permanent improvement of hearing. Conventional bone conduction hearing aids are, however, uncomfortable to wear, amplification is frequently less effective and sounds are often distorted. A new type of bone conduction hearing aid, the bone-anchored hearing aid (BAHA) is presented. In this, sound is transferred directly to the cranium via a percutaneous titanium implant. The results of treatment of the first six Danish patients are presented after a therapeutic period of 8-24 months. The subjective effect of treatment was satisfactory in all of the patients. They all employed their BAHA all day and found that the effect was better than the effect of air conduction hearing aids and conventional bone conduction hearing aids on practically all points. Speech discrimination investigations in quiet and noisy surroundings confirmed the subjective assessment although the differences between BAHA and the two other types of hearing aids were not as great as the patients subjective impressions. The bone-anchored hearing aid, BAHA, should, in our opinion, become the bone conduction hearing aid of the future for patients who have a permanent need for this. It represents considerable progress in treatment of a group of patients for whom treatment has hitherto been difficult and unsatisfactory.

Aged↗
PubMed1990

Topical application of decongestant in dysfunction of the Eustachian tube: a randomized, double-blind, placebo-controlled trial.

Thirty-six patients, aged 12-75 years, with dry, central tympanic membrane perforations and a negative Valsalva manouevre and/or a negative aspiration/deflation test, were included in a randomized, double-blind, placebo-controlled trial on the effect of a decongestant agent (xylometazoline chloride 0.1%) and placebo (saline 0.9%) applied directly to the pharyngeal opening of the Eustachian tube. Judged by the Valsalva manouevre, tubal patency was significantly improved after application of the active drug (P less than 0.003). In contrast, no effect was demonstrated by the aspiration test (P = 0.80) or the deflation test (P = 0.51). It is concluded that a topical decongestant improves Eustachian tube function but only at unphysiologically high pressures.

Administration, Topical↗
PubMed1989

[Surgical treatment of chronic maxillary sinusitis. Report of a new surgical technic and an evaluation of results of traditional surgery].

During recent years, a new operative procedure for treatment of chronic maxillary sinusitis has been strongly recommended as being more effective and more physiological than the traditional Caldwell-Luc operation. The principle of the method is endoscopically guided endonasal resection of the anterior ethmoid cells and enlargement of the natural ostium of the maxillary sinus in the middle meatus. In contrast, the principle in the Caldwell-Luc operation is opening into the sinus in the canine fossa, providing direct approach to the lumen, and finally creation of a fenester towards the inferior meatus. However, the publications hitherto presented have not documented clearly the efficiency of this new method, which also appears to have an increased risk of complications, some of which are serious. The present study elucidates the efficiency and side effects of the traditional Caldwell-Luc operation in 77 patients (107 maxillary sinuses). Four to nine years after the operation 73% of the patients had had satisfactory subjective effect of the operation. Consistency was present between the subjective estimation and the objective findings at follow-up. The effects included only slight disturbances of the sensibility in the infraorbital nerve (n = 9) or teeth (n = 6). However, only two patients (3%) had more troublesome change of the sensibility in the infraorbital nerve and in one patient only a subjectively "dead" tooth was also avital at vitality testing. The survival of the teeth was estimated roughly by comparison of the number of teeth on the operated side versus the non-operated side and was unimpaired.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1989

[Surgical treatment of otosclerosis. Effects and risks].

Surgical treatment of otosclerosis involves an opening of the labyrinth and, accordingly, a risk of complications from that organ: vertigo and sensorineural hearing loss or anacusis. During the past decade, the number of new patients with otosclerosis has stabilized at a low level in Danish ENT-departments. Thus, typically the number of stapedectomies per year per department is between 10 and 25. The study elucidates effects and risks at the operation, focusing in particular on the question whether this treatment ought to be centralized. In a seven-year period, a total of 75 stapedectomies in 73 patients with otosclerosis were performed at the ENT-department, Glostrup Hospital, Copenhagen. No revision operations were included. Hearing gain was obtained in all patients except two and the conductive hearing loss was eliminated in 87% of the cases. One patient developed severe sensorineural hearing loss caused by granuloma around the prosthesis, a very rare complication of uncertain cause. Thus, the results were satisfactory but in this series all operations except two were performed by the same expert surgeon in a department with high activity in otosurgery for other diseases. If similar conditions are not available a certain degree of centralization should be considered. The long-term results and the question of bilateral stapedectomy are discussed.

Adult↗
PubMed1989

Myxoid tumours in the temporal bone.

Myxoid tumours have the essential common feature, that they are difficult to remove radically because of their gelatinous consistency. Only one previous report describes a myxoid tumour--a myxoma--located to the temporal bone. This paper presents two such tumours in the temporal bone, a myxoma and an extraskeletal myxoid chondrosarcoma. The clinical and histological features of these tumours and the operative treatment are described and discussed.

Adult↗
PubMed1988

Post-tonsillectomy haemorrhage and analgesics. A comparative study of acetylsalicylic acid and paracetamol.

In a prospective randomized clinical study the incidence of post-tonsillectomy haemorrhage was studied in 832 patients receiving either acetylsalicylic acid or paracetamol as postoperative analgesic (423 and 409 patients, respectively). Of 27 patients experiencing 1 or more bleeding episodes postoperatively, 18 received acetylsalicylic acid and 9 paracetamol. No difference was found regarding the incidence of bleeding within the first 24 h but, later on, a significantly lower incidence of secondary bleeding occurred in the paracetamol group (0.5%) compared with the acetylsalicylic acid group (3.1%). We conclude that acetylsalicylic acid is not the optimum postoperative analgesic following tonsillectomy and that other alternatives must be sought.

Acetaminophen↗
PubMed1987

Peritonsillar abscess with parapharyngeal involvement: incidence and treatment.

In 2.3% of 217 patients with peritonsillar abscess, the clinical picture was atypical, with inflammatory swelling of the pharyngeal wall below and behind the tonsil, oedema of the epiglottis and a diffuse swelling on the side of the neck. The typical signs of peritonsillar abscess, i.e. trismus, a medially displaced tonsil and displacement of the uvula toward the opposite side, were either completely lacking or less pronounced than usual. The abscesses were all located in the peritonsillar space at the lower pole or behind the tonsil. To ensure rapid, uncomplicated recovery in such cases with parapharyngeal involvement, it is essential that abscess tonsillectomy under antibiotic cover with penicillin is not postponed.

Adult↗
PubMed1986

Silastic coated incus in tympanoplasty: a preliminary report.

In 54 ears lacking the stapedial arch and the long process of the incus, ossiculoplasty was performed with a shaped auto- or homologous incus as columella. In 29 of the ears, the deep, slender part of the columella was coated with a silastic tube in order to prevent adhesions and dislocation. One year after the operation the functional results were similar in patients with silastic coating of the incus to those without. It is concluded that the less satisfactory results of tympanoplasty in such ears are primarily caused by factors outside the niche of the oval window. Possible ways of improving the results are discussed.

Adolescent↗
PubMed1986

Hearing in patients in a department for long-term medicine. A further report.

Audiological screening was performed in 164 patients, aged 32-89 (median 71) years, in a department for long-term medical treatment. 45% of the patients had a hearing loss exceeding 30 dB HL in the frequency range 500-2 000 Hz (pure-tone average, PTA). The aetiology of the hearing loss was in most cases presbycusis, as the pure-tone thresholds were closely related to the age of the patients. The speech discrimination score for the better ear was impaired (less than 90%) in about 50% of the patients. Nevertheless, only 15% of the patients felt they had a significant hearing handicap. On average, these patients had a hearing loss exceeding 50 dB HL (PTA). The nursing staff estimated about two-thirds of the patients as having normal hearing and only 6% of the patients as having a severe hearing loss. The otologists also underestimated the number of patients with audiometrically impaired hearing. 11% of the patients had a hearing aid, but in nearly half of the patients, the function of the device was defective, either due to flat batteries, incorrect mounting or similar minor defects. A positive effect was observed subsequent to annual 2-hour courses for nurses, focusing on problems in communication with elderly people and on assisting patients who use a hearing aid.

Adult↗
PubMed1985

The value of X-ray examination of the paranasal sinuses after epistaxis.

In a number of Danish ENT departments, X-ray examination of the paranasal sinuses has been a routine procedure in cases of severe epistaxis of uncertain genesis, two to four weeks after its treatment has been completed. The object has been to rule out cancer of the nose and/or paranasal sinuses. In the present study, the value of this procedure was assessed.

Acute Disease↗
PubMed1985

Grommets versus paracentesis in secretory otitis media. A prospective, controlled study.

One hundred and ninety-three consecutive children with bilateral secretory otitis media were treated by adenoidectomy, bilateral paracentesis, and evacuation of middle ear effusion, but with insertion of a grommet in the right ear only. At follow-up one to three years later, the audiometric and tympanometric results were similar in right and left ears. The primary advantage of grommet insertion was normalization of the hearing ability for as long as the grommet was functioning. Thus, only 1% of the ears with grommets had hearing losses exceeding 30 dB HL, whereas this occurred in about 20% of ears without grommets. The adverse effects of grommet insertion included periodic aural discharge during the functioning period of the grommet in 14% and tympanosclerosis of the drum in 48%. In the group of ears treated with paracentesis only, tympanosclerosis occurred in 10%. However, reinsertion of grommets was indicated in 10% of right ears, and 23% of left ears required grommets as well. Of the various pre- and perioperative factors analyzed, only a granulating mucous membrane and copious middle ear effusion could be correlated to frequent and protracted episodes of secretory otitis that required repeated treatment. The implications of these findings are discussed.

Acoustic Impedance Tests↗