PubMed Health⌕ Search

Biomedical subjects

K F Moos

Publications and source records attributed to K F Moos.

At least 37 records · Page 2Linked to original sources
PubMed1997

The use of biodegradable fixation in sagittal split and vertical subsigmoid osteotomy of the mandible: a preliminary report.

OBJECTIVE: An absorbable pin made from poly-p-dioxanone (Orthosorb, Johnson and Johnson, UK) was used to internally fix osteotomies of the mandibular ramus. We present our initial series of 10 patients. DESIGN: Open study. SETTING: Regional unit, teaching hospital, UK. SUBJECTS AND INTERVENTIONS: 10 patients who required a bilateral sagittal split osteotomy (BSS, n = 3) or a vertical subsigmoid osteotomy (BVSS, n = 6), or both (n = 1). MAIN OUTCOME MEASURE: Jaw functioning and ability to open mouth. RESULTS: 9/10 followed up for 1 year, 1/10 lost to follow up at one month, 1/10 lost to follow up at one year. 7/9 reported the same degree of mouth opening as preoperatively, 2/9 slightly less. 3/10 developed slight anterior open bite problems; 1/10 required no treatment, 1/10 improved with selective grinding, and 1/10 was lost to follow up. No patient complained of discharge from the site of the implant or of any change in sensation of the lip. CONCLUSION: Small absorbable implants undoubtedly have a place in selected maxillofacial operations, but there are still some problems with their use, including complications during the learning curve.

Adolescent↗
PubMed1997

A three-dimensional imaging system for archiving dental study casts: a preliminary report.

Dental study casts form an essential part of patient records for both diagnostic and medicolegal purposes. Storage of study casts poses major problems because of inconvenience and cost of mass storage. Various methods for recording and storage of study casts are discussed. A new biostereometric technique for digitally recording and storing dental casts, and using the recent advances in stereophotogrammetry, is presented. Archiving dental casts in a digital format would reduce problems of mass storage and provide new benefits such as duplication of casts and use in clinical and research studies.

Archives↗
PubMed1996

Three-dimensional modeling for modern diagnosis and planning in maxillofacial surgery.

The existing methods of recording the face in three dimensions are reviewed, and a new method for three-dimensional facial modeling is introduced. The technique utilizes two stereo pairs of videocameras, a stereo pair at each side of the patient's face. The system allows rapid capture of the face in three dimensions and precise measurement of anatomic landmarks. The system can be used to capture the facial image and a cephalogram almost simultaneously, allowing more accurate superimposition of soft and hard tissues. This precision will facilitate development of the surgical treatment plan. A computer program in the early stages of development will use the data generated by this biostereometric measurement system to predict soft tissue changes following orthognathic surgery.

Cephalometry↗
PubMed1995

Orthognathic surgery: patient expectations; psychological profile and satisfaction with outcome.

61 orthognathic surgery patients were studied (39% male, 61% female). It confirms that the group of patients we see in the West of Scotland are well adjusted psychologically and that the majority seek orthognathic surgery for aesthetic reasons. The degree of satisfaction is high (87%). Dissatisfaction is not related to sex, age or procedure. Patients who were dissatisfied tend to have higher neuroticism scores on the Eysenck Personality Inventory and those patients who had had unreal expectations of post surgical pain, numbness and swelling, were likely to express dissatisfaction with the outcome in the early stages. Several patients initially expressed some dissatisfaction with the outcome after 3 months then went on to increase their score and by 12 months became satisfied with the procedure. The authors outline the importance of adequate patient preparation prior to surgery and the use of printed literature is recommended.

Adolescent↗
PubMed1995

The use of silastic as an orbital implant for reconstruction of orbital wall defects: review of 311 cases treated over 20 years.

PURPOSE: A retrospective review of silicone rubber (Silastic; Dow Corning, Midland, MI) implants placed in orbits was undertaken. These implants were used to reconstruct defects in the orbital floor and/or walls secondary to trauma, or those created during malar or orbital osteotomies. The purpose of the study was to determine the incidence of removal of these implants from the surgical site. MATERIALS AND METHODS: The records of 311 patients treated over a 20-year period were reviewed. Of these, 302 had received silastic implants secondary to trauma. RESULTS: Forty-one patients (13%) had their implant removed at a second operation. The reasons for removal included infection, migration of the implant, worsening eye sign such as diplopia, and others. CONCLUSION: Because there was a clinically significant rate of removal of this material, consideration should be given to the use of other available materials.

Adolescent↗
PubMed1995

Morbidity of the infraorbital nerve following orbitozygomatic complex fractures.

Acute sensory disturbances in the distribution of the infraorbital nerve are recognised signs present in patients with orbitozygomatic complex fractures. Fifty consecutive patients with unilateral orbitozygomatic complex fractures were evaluated with regard to the long-term infraorbital nerve sensory function. The highest incidence of long-term neurosensory deficits occurred in fractures with an undistracted frontozygomatic suture. This is in complete agreement with the distribution of long-term neurosensory deficits regarding the method of treatment for orbitozygomatic complex fractures. In our series slightly more than one-third of the patients had third or fourth degree nerve injuries, according to Sunderland's classification, to the infraorbital nerve following orbitozygomatic complex fractures. This outcome should influence the management of orbitozygomatic complex fractures. With regard to fixation of unstable malar fractures in relation to sensory recovery of the infraorbital nerve, miniplate osteosynthesis is recommended as opposed to wire fixation in all unstable bone fractures when there is displacement. Furthermore, open reduction and fixation of an orbitozygomatic complex fracture offer a better prognosis for complete recovery of the infraorbital nerve function than elevation only with or without Kirschner wire fixation.

Adult↗
PubMed1995

Stability of sagittal split advancement osteotomy: single- versus double-jaw surgery.

The effect of Le Fort I maxillary impaction on the stability of the sagittal split advancement osteotomy is debatable. The aim of this study was to compare the stability of mandibular advancement in two groups of patients: those that had simultaneous Le Fort I maxillary impaction and sagittal split advancement osteotomy and those that had only sagittal split advancement osteotomy. Lateral cephalograms taken immediately after surgery, 6 months postoperatively, and at 1-year follow-up were used in the assessment. In addition to routine cephalometric analysis, the Euclidean Distance Matrix method was also used. The magnitude of mandibular relapse was similar in both groups in the form of mandibular clockwise rotation and posterior settling. The mandible rotated by 2.2 degrees in the single-jaw surgery group and 2.5 degrees in the bimaxillary osteotomy group. The mandible settled posteriorly by 1.0 degree in the single-jaw surgery group and 1.2 degrees in the bimaxillary osteotomy group. The differences were not statistically significant. In all the patients, Le Fort maxillary osteotomy was more stable than was mandibular advancement. The counter-clockwise rotation of the distal mandibular segments and the distraction of the condylar segments during surgery were responsible for mandibular relapse.

Cephalometry↗
PubMed1994

Assessment of chin surgery by a coordinate free method.

A quantitative description of the changes and stability after genioplasty in a cross-sectional sample of 19 patients who had advancement genioplasty is presented. Euclidean distance matrix analysis (EDMA) of five cephalometric landmarks was used to assess these changes. During the first 6 months after surgery, bone deposition occurred at B point and pogonion, with bone resorption at the superior and posteroinferior aspects of the advanced segment. The genial segment rotated slightly anticlockwise. The authors believe this to be due to the action of the mentalis muscles. The stability of the advanced segment was excellent when assessed 1 year after surgery. The Euclidean distance matrix method can be used to assess shape changes and does not require cephalographic superimposition. It can also distinguish repositioning from remodelling and the changes of genioplasty from those of concomitant orthognathic surgery.

Cephalometry↗
PubMed1994

A comparison of wire osteosynthesis and screw fixation in the stability of bimaxillary osteotomies.

This study compared stability of rigid and nonrigid fixation in patients who underwent simultaneous sagittal split mandibular advancement and Le Fort I maxillary impaction. Immediately postoperative, 6-month, and 1-year follow-up cephalograms were used in the assessment. Slight inferior settling of the posterior end of the maxilla was detected in the nonrigid fixation group, but the maxilla generally stayed within 1 mm of its immediately postsurgical position in both groups. At the 6-month follow-up, the rigid fixation group averaged 2.5 degrees of clockwise mandibular rotation without any change in the gonial angle. In the nonrigid fixation group, the distal segment had rotated in a clockwise direction with an increase in the gonial angle of 3.0 degrees. No further changes were detected in the rigid fixation group, whereas the mandible continued its clockwise rotation in the nonrigid fixation group. These results support the belief that rigid fixation is more stable than wire osteosynthesis. The merits of assessing cephalograms with finite element and Euclidean distance matrix analyses to evaluate surgical changes and stability are discussed.

Bone Plates↗
PubMed1993

Evaluation of changes following advancement genioplasty using finite element analysis.

This study examined skeletal stability and the remodelling process following advanced pedicled genioplasty. Twenty patients who had advancement genioplasty concomitant with other adjunctive orthognathic surgery were evaluated. A finite element analysis method was used to assess these changes. The stability of the advanced segment was excellent after 6 months. At 6 months bone remodelling was observed in the form of bone apposition at B point and Pogonion with bone resorption at the superior aspect of the advanced segment. The genial segment rotated about 12 degrees antero-superiorly which was thought to be due to the action of the mentalis muscle. Finite element analysis is a sensitive tool for assessing changes after genioplasty and was able to separate them from the effects of other adjunctive orthognathic surgery.

Bone Remodeling↗
PubMed1993

The compressible silicone rubber prosthesis in temporomandibular joint disease.

An alternative technique for temporomandibular joint arthroplasty is described, in which the mandibular condyle is replaced by a soft compressible silicone rubber prosthesis. A modified Nicolle-Calnan metacarpo-phalangeal joint prosthesis was used to reconstruct 31 joints in 24 patients. Results suggest that in those patients where there has been no loss of the prosthesis, function continues to be markedly improved when compared with the pre-operative condition. Painful symptoms were relieved in cases of specific joint pathology but the technique was of little value in the management of dysfunctional pain when radiographic evidence of joint pathology was absent. A specifically designed TMJ prosthesis of this type may be a useful addition to the surgeon's armamentarium.

Adolescent↗
PubMed1993

The stability of bimaxillary osteotomy after correction of skeletal Class II malocclusion.

This study investigates changes following bimaxillary osteotomy for correction of Class II malocclusion. The records of 15 patients who had simultaneous maxillary impaction and sagittal split ramus osteotomy with rigid fixation are evaluated. Traditional cephalometric analysis as well as finite element and Euclidean distance matrix analyses are used to assess the changes. The maxilla was relatively more stable than the mandible; the maxilla stayed within 1 mm of its immediate postoperative position, whereas the mandible was 2 mm from the achieved surgical changes. The mandible rotated in a clockwise direction during the first 6 months after surgery. The mandibular plane angle increased by 2.9 degrees. This is, in part, believed to be due to posterior condylar displacement during surgery. Theories of mandibular relapse following sagittal split advancement osteotomy are discussed. The new methods of morphometric analysis do not require the superimposition of cephalograms and are able to separate maxillary from mandibular changes.

Adult↗
PubMed1992

Abnormal bone masses in Klippel-Feil syndrome.

Five female patients with Klippel-Feil syndrome (KFS) are presented with abnormal bony masses in the mandibular ramus region. The features of KFS are described with assessment and treatment of the five patients. Although congenital duplication of mandibular rami in KFS has been previously documented, we believe this is the first series of patients with this deformity.

Adult↗