Search PubMed⌕ Search

Biomedical subjects

P K Turley

Publications and source records attributed to P K Turley.

16 recordsLinked to original sources
PubMed1993

Surgical-orthodontic management of persistent closed lock of the TM joints.

Surgical management of internal derangement in the temporomandibular joint traditionally involves disk repair or removal. Disks are often replaced with various types of autogenous, allogenic or alloplastic materials. The failure rates for such replacements are estimated at 10% to 20%. Current thinking suggests that permanent alloplastic interpositional grafts should be avoided. The following report describes the orthodontic/orthognathic surgical management of a patient with bilateral Silastic fossa implants.

Adult↗
PubMed1993

The Don Spring Memorial Oration: orthodontic management of the short face patient.

In September 1992, the Australian Foundation for Orthodontic Research and Education held its biennial meeting at Hamilton Island, Queensland. The guest lecturer was Dr Patrick Turley. The first of Dr Turley's presentations was the The Don Spring Memorial Oration, the content of which is included in the following article. The article has been reprinted with the permission of the Editor of the Pacific Coast Society of Orthodontists' Bulletin. The second article will appear in the October 1993 edition of this Journal.

Cephalometry↗
PubMed1992

Force magnitude effects upon osteoprogenitor cells during premaxillary expansion in rats.

To study the effects of force magnitude on osteoprogenitor cell activity during premaxillary expansion, stainless steel helical springs were attached to the maxillary central incisors of 45 3-month-old male rats. The animals were randomly divided into force levels (0, 50, 100, 150, 200 gm) and were injected intraperitoneally with tritiated thymidine (1.0 uc/g wt.) 1 hour prior to sacrifice which occurred at 27, 40, and 60 hours. In order to examine cell activity within different regions of the suture, each premaxilla was divided into three geographic areas. Quantitative results were obtained by comparing the percent of labeled cells observed at different force levels, geographic areas, and observation times. The greatest number of labeled cells at each force level was found at 27 hours. Increased forces were correlated with increased numbers of labeled cells up to 100 gm, with decreased cell numbers at higher forces. The numbers of labeled cells at 200 gm were not significantly different from the controls. Histological observations of early bone formation at 60 hours supported the quantitative labeling results at 27 hours. The results also demonstrate a significant correlation between the geographic location of the labeled cells and force magnitude, with maximal cell stimulation occurring more superiorly in the suture as forces increased. The results suggest that early bone formation within the expanded suture can be maximized by varying force magnitude and distance from the point of force application.

Animals↗
PubMed1989

Orthodontic space closure of the edentulous maxillary first molar area in adults.

The purpose of this study was to examine the dental and periodontal changes associated with orthodontic space closure of edentulous maxillary first molar areas in adults. The sample consisted of 20 quadrants from 18 patients. The pretreatment and posttreatment records included study casts, lateral cephalometric radiographs, and periapical or panoramic radiographs. Space closure averaged 5.3 mm. Eleven quadrants showed complete space closure, and nine quadrants averaged 1.0 mm of remaining space. Vertical bone loss averaged 1.2 mm mesial to and distal to the second molar and 0.6 mm distal to the second premolar. Although 60% of the quadrants showed less than or equal to 1.5 mm of bone loss, the maximal bone loss reached 4.0 mm mesial to, and 5.0 mm distal to, the second molar. Although space closure should be considered a potential solution in the absence of the first permanent molar, alveolar bone loss and space opening can be common sequelae to this procedure.

Adolescent↗
PubMed1987

The clinical management of ectopically erupting first permanent molars.

The literature on ectopically erupting first permanent molars is reviewed. The progression of the ectopic condition is discussed along with factors that will affect the practitioner's decision on a mode of treatment. The optimal treatment approach depends on the clinical eruption status of /6/, the change in position of /6/, the amount of enamel ledge of /E/ entrapping /6/, the mobility of /E/, and the presence of pain or infection. A variety of treatment approaches together with diagnostic rationale and clinical guidelines are presented. Overall aspects of the malocclusion must be considered when planning the management of ectopically erupting first permanent molars.

Child↗
PubMed1987

Traumatically intruded teeth.

Various combinations of orthodontic force, luxation, and observation are applied to 12 teeth traumatically intruded in 3 large dogs. All showed root resorption to some degree. Early orthodontic repositioning, with luxation if immobile, produced the best recovery.

Animals↗
PubMed1984

The effects of space closure of the mandibular first molar area in adults.

There is little information regarding the orthodontic closure of remodeled, edentulous spaces in the posterior area of the mandible. The present study was undertaken to determine the dental and periodontal changes that occur when mandibular first molar areas are closed in adults. Fourteen adult patients were selected from private orthodontic practices. Pre- and posttreatment study models were used to measure the mesiodistal length of the edentulous space and the buccolingual width of the alveolar ridge. The amount of crown and root movement of the second molar and premolar was measured from lateral cephalometric radiographs. From pre- and posttreatment panoramic or periapical radiographs, the anatomic changes of the second molar and adjacent periodontium were also measured. Every case showed significant space closure (x = 6.2 mm) ranging from 2.7 to 11.5 mm. There was crestal bone loss (x = 1.3 mm) mesial to the second molar in all but five cases. These latter cases showed bone addition. As the molar moved mesially , the alveolar ridge increased in width an average of 1.2 mm. The adult patient who showed the greatest amount of space closure and the least amount of molar bone loss had (1) mesiodistal space of 6.0 mm, (2) buccolingual ridge width of 7.0 mm, and (3) mesial molar bone level 1.0 mm apical to the cementoenamel junction. The results of this study indicate that space closure is not only possible but may aid the treatment of certain cases. Space closure should be considered as a potential solution to the absence of mandibular first permanent molars.

Adult↗
PubMed1984

The effect of orthodontic extrusion on traumatically intruded teeth.

The management of traumatically intruded permanent incisors is controversial. Some authors suggest a decreased incidence of ankylosis in cases treated with orthodontic extrusion. The purpose of this study was to examine two common management techniques for traumatic intrusion, orthodontic extrusion, and observation for re-eruption. The four first premolars of three shepherd dogs were traumatically intruded with a mallet while a holding device was used to prevent tooth fracture. Five to 7 days following the injury, orthodontic force was applied unilaterally while the contralateral tooth served as the untreated control. To facilitate serial periapical radiography, x-ray jigs were fabricated for each animal and tantalum implants were placed in the bone distal to the permanent canine and first and second premolars. Observations included radiographic measurement of tooth movement, clinical estimates of tooth mobility, and radiographic and histologic assessment of root resorption, ankylosis, and periapical pathosis. The amount of traumatic intrusion varied from less than 0.5 to 4.1 mm. Following 11 to 13 weeks of force activation, 10 of 12 traumatized teeth showed clinical, radiographic, and histologic evidence of ankylosis irrespective of orthodontic treatment. Whereas the ankylosed teeth did not move with orthodontic forces, the teeth used for force application were orthodontically intruded 1.7 to 6.5 mm. When the injury to the tooth was severe, orthodontic extrusion had little effect on repositioning of the injured tooth but resulted in undesirable movement of the anchorage teeth. When the injury was less severe, orthodontic forces facilitated repositioning of the affected tooth.

Animals↗