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Biomedical subjects

W Chee

Publications and source records attributed to W Chee.

17 recordsLinked to original sources
PubMed2007

An interdisciplinary approach to treatment planning in implant dentistry.

The practice of implant dentistry requires an interdisciplinary approach that integrates the knowledge, skills and experience of all the disciplines of dentistry into a comprehensive treatment plan. This article outlines a comprehensive interdisciplinary treatment philosophy designed for developing the foundation of optimal aesthetics in implant dentistry. Cases are presented to illustrate the utility of interdisciplinary treatment in which specialists are recruited to enhance and improve a patient's dental function and aesthetics.

Adult↗
PubMed2007

Laparoscopic dismembered pyeloplasty in children younger than 2 years.

PURPOSE: Since the first laparoscopic pyeloplasty was described in a child in 1995, there have been several reports of pyeloplasty in older children. However, to date there have been few reports of laparoscopic pyeloplasty in infants and toddlers. The aim of this study was to evaluate the results of laparoscopic pyeloplasty in children younger than 2 years. MATERIALS AND METHODS: All laparoscopic Anderson-Hynes pyeloplasties performed in children younger than 2 years were retrospectively reviewed. The diagnosis of ureteropelvic junction obstruction was confirmed on renal sonography and diuretic renogram. Laparoscopic pyeloplasties were performed via a transperitoneal route as originally described, with key modifications. All children were investigated with postoperative diuretic renogram and renal ultrasonography. RESULTS: A total of 38 children with ureteropelvic junction obstruction underwent laparoscopic Anderson-Hynes pyeloplasty between January 2001 and December 2005. Of these patients 11 (7 males and 4 females) were younger than 2 years at surgery (median 1.4, range 2 to 22 months) and 1 had bilateral ureteropelvic junction obstruction, for a total of 12 primary repairs. However, 2 patients (17%) required redo laparoscopic pyeloplasty, for a total of 14 laparoscopic dismembered pyeloplasties in this age group. Operative time ranged from 70 to 140 minutes (mean 100) and median hospital stay was 2 days. Followup studies showed normal drainage in all patients except 1, who after redo pyeloplasty exhibited significantly improved but still prolonged drainage. CONCLUSIONS: This study suggests that laparoscopic pyeloplasty can now be performed in young children with good results.

Female↗
PubMed2006

The role of orthodontics in implant dentistry.

Orthodontic treatment of partially edentulous patients is difficult, especially if a significant number of teeth are missing. With loss of teeth, adjacent or opposing teeth usually tip, drift or over-erupt leaving spaces that are not optimal for replacement of missing teeth. Orthodontic correction of these spatial relationships will aid prosthetic replacement of the missing teeth, function, hygiene and aesthetics. Orthodontists rely on teeth to provide the anchorage to correct malocclusions. With patients with an intact dentition dental anchorage is usually adequate to facilitate tooth movement. In some partially edentulous patients however, insufficient anchorage may present to correct the malocclusion. In these patients implants can provide additional anchorage. At times, osseointegrated implants can also be used to support restorations after completion of orthodontic therapy if treatment planning is precise. The use of implants for orthodontic anchorage requires an interdisciplinary approach and precise planning to achieve optimal results.

Alveolar Bone Loss↗
PubMed2006

Transitioning patients from teeth to implants.

One major obstacle to treatment with implants is the transitional phase between a tooth supported occlusion and an implant supported occlusion. This is of particular concern when a patient with a failing dentition has not worn a removable prosthesis before and is planning to have a reconstruction supported by implants.

Dental Abutments↗
PubMed2006

Connecting implants to teeth.

Osseointegrated implants have proven to have a high degree of success in the edentulous arches. This success has been replicated in partially edentulous arches. When natural teeth are present, it can be tempting to fabricate restorations using support from both implants and natural teeth. The mechanism of attachment and the perceived problem of the differential support provided by the implant and the tooth have been discussed by many authors.

Dental Implantation, Endosseous↗
PubMed2006

Designing abutments for cement retained implant supported restorations.

In another article in this series the authors' preference for screw retained implant supported restorations was presented together with a literature review and rationale.(1) There remain situations when screw retention is not possible due to implant position, implant trajectory, aesthetics or function.

Animals↗
PubMed2006

Screw versus cemented implant supported restorations.

Implant supported restorations can be attached to implants with screws or can be cemented to abutments which are secured to implants with screws. Screw retained implant restorations are the authors' preferred method of securing restorations to implants. This article will be written from this perspective and the advantages and disadvantages of each method of retention will be discussed under the following headings: Aesthetics, Retrievability, Retention, Implant placement, Passivity, Provisionals, Occlusion, Immediate loading, Impression procedures, Long term treatment planning.

Cementation↗
PubMed2006

Impression techniques for implant dentistry.

The object of making an impression in implant dentistry is to accurately relate an analogue of the implant or implant abutment to the other structures in the dental arch. This is affected by use of an impression coping which is attached to the implant or implant abutment. This impression coping is incorporated in an impression - much as a metal framework is 'picked up' in a remount impression for fixed prosthodontics. With implant copings the coping is usually attached to the implant or abutment with screws. The impression material used is usually an elastomeric impression material; the two types most widely used and shown to be the most appropriate are polyether and polyvinyl siloxane impression materials.

Dental Abutments↗
PubMed2006

Treatment planning of the edentulous mandible.

Edentulism can be a debilitating handicap. Zarb described endentulous individuals who could not function as 'denture cripples'.(1) Most difficulty with complete denture prostheses arises from the inability to function with the mandibular prostheses. Factors that adversely affect successful use of a complete denture on the mandible include: 1) the mobility of the floor of the mouth, 2) thin mucosa lining the alveolar ridge, 3) reduced support area and 4) the motion of the mandible (Figs 1,2). These factors alone can explain the difficulty of wearing a denture on the mandibular arch compared to the maxillary arch. The maxilla exhibits much less mobility on the borders of the denture than the mandible, moreover having a stable palate with thick fibrous tissues available to support the prostheses and resist occlusal forces. These differences explain most of the reasons why patients experience difficulty with using a complete denture on the mandibular arch compared to the maxillary arch.

Dental Prosthesis, Implant-Supported↗
PubMed2006

Treatment planning of the edentulous maxilla.

The predictability of successful osseointegrated implant rehabilitation of the edentulous jaw as described by Branemark et al., introduced a new era of management for the edentulous predicament. Implant rehabilitation of the edentulous maxilla remains one of the most complex restorative challenges because of the number of variables that affect both the aesthetic and functional aspect of the prosthesis. Among the prosthesis designs used to treat the edentulous maxilla are fixed or removable implant-supported restorations. Since the aesthetic requirements and preoperative situation of each patient varies, considerable time must be spent on accurate diagnosis to ensure patient desires are satisfied and predictable outcomes are achieved. The purpose of this article is to compare the treatment options and prosthesis designs for the edentulous maxilla. Emphasis will be placed on diagnosis and treatment planning. Criteria will be given to guide the practitioner in deciding whether a fixed or removable restoration should be placed. This objective will be accomplished through the review of cases with regard to varying design considerations and factors that influence the decision-making process.

Aged↗
PubMed2006

Treatment planning of implants in the aesthetic zone.

Aesthetic restoration of anterior teeth with implant supported restorations is one of the most difficult procedures to execute. Bone resorption following anterior tooth extraction often compromises gingival tissue levels for the implant restoration. In the last 10 years the focus has shifted from osseointegration, to creation of an implant borne restoration which is in harmony with the surrounding hard and soft tissue. Complete reconstruction of tooth and gingival related aesthetics remains the primary objective and in some instances can be very difficult to achieve.

Alveolar Ridge Augmentation↗
PubMed2006

Treatment planning of implants in posterior quadrants.

Differences in anatomy and biomechanics make treatment of posterior quadrants with dental implants substantially different to that of anterior areas. Without implants, when posterior teeth were lost, treatment options included a long span fixed partial denture or a removable prosthesis, especially when no terminal abutment was available. Today, with the use of implants, options are available that allow preservation of unrestored teeth.(1) When teeth are missing, implant supported restorations can be considered the treatment of choice from the perspective of occlusal support, preservation of adjacent teeth and avoidance of a removable partial denture.

Bicuspid↗
PubMed2006

Rationale for dental implants.

The clinical replacement of lost natural teeth by osseointegrated implants has represented one of the most significant advances in restorative dentistry. Two decades ago, a majority of dentists were sceptical about implants and rejected them entirely. Today it is rare to find a practitioner who does not work with dental implants or who is not actively participating in one of the many seminars or courses offered by universities, professional societies and implant manufacturers.

Alveolar Bone Loss↗
PubMed2001

A feminist critique on the use of the Internet in nursing research.

With the increasing use of the Internet, the importance of incorporating this new technology in nursing research increases. Yet nursing has been slow in adopting this new technology as a research method, and the use of the Internet in nursing research rarely has been discussed and critiqued. In this article, use of the Internet in nursing research is analyzed and critiqued from a feminist perspective. The analysis indicates that use of the Internet in research frequently brings about selection biases because of a limited pool of potential participants, it usually does not provide contextual data on research encounters, it might not uncover women's subjective experiences under marginalized situations, and it tends to raise power issues related to the relationships between researchers and participants. Despite the limitations, use of the Internet in research provides better communication channels for research participants, more flexibility in time and place of data collection, and less expense for data collection. Based on the critique, feminist challenges for future use of the Internet in nursing research are proposed.

Bias↗
PubMed2001

A feminist critique of research on cancer pain.

A number of studies on cancer pain have been conducted but the researchers rarely considered gender and ethnic differences in cancer pain. In this article, nursing research on cancer pain is critiqued from a feminist perspective, and directions for future nursing research are proposed. A total of 82 nursing articles published in the United States were retrieved through MEDLINE and MELVYL data retrieval systems, and analyzed and critiqued in terms of four basic elements of research from a feminist perspective (bias as resources, dependability, credibility and adequacy, and intersubjectivity). In this article, the critique is presented with four themes that may provide reasons why nursing research on cancer pain rarely incorporated gender and ethnic differences: absence of participants' own views and experiences, androcentrism and ethnocentrism, lack of consideration on contextual factors, and distant relationships between researchers and research participants. To overcome the limitations, six critical elements including gender and ethnic sensitivity, avoidance of distorted views, respectfor participants' own views and interests, trust and openness, empowerment, and multiple methods are suggested to be incorporated in future nursing research on cancer pain.

Attitude to Health↗
PubMed1998

Clinical and microbiological aspects of the Sargon immediate load implant.

A maxillary lateral incisor with severe periodontal destruction was extracted after forced eruption and was replaced with a Sargon Immediate Load Implant. The clinical and microbiological results of the case are reported. The Sargon Immediate Load Implant is an apically expandable, quintapodal, root-form dental implant, designed to be loaded immediately with a provisional fixed restoration in normal occlusion.

Dental Implantation, Endosseous↗