Removable Partial Overdenture Research Articles

Effect of implant assisted partial overdenture with neutral zone concept in partially resected mandible restoration on facial contour and bone density

This study was performed to evaluate the effect of implant assisted partial overdenture located in neutral zone for restoring partially resected mandible on facial contour and bone density. Material and methods10 patients their age range from 18 to 45 years were selected. Each patient had partially resected mandible with osseous bone graft. Patients received removable partial overdenture assisted by two implants with suitable length and diameter guided by CBCT scan using early loading protocol two months after implant insertion. That partial overdenture respected neutral zone registration. Patients were recalled after two months from transitional partial denture insertion, two months after implant insertion and two months after implant assisting removable partial overdenture for facial symmetry evaluation, and assessment of bone quality. The data were collected, tabulated and statistically analyzed using test (ANOVA) with repeated measures comparing different follow up periods for bone density, and paired t-test comparing facial symmetry before reconstruction versus after reconstruction and mirror images to healthy side. ResultsCurrently it was found that early loading protocol with two implants supported mandibular partial overdenture with neutral zone in reconstructed resected mandible produce implant success rates, and improve facial asymmetry.

Abutment Tissue Health as Related to Clasp Design in Implant Assisted Mandibular Distal Extension Removable Partial Overdentures.

Abutment Tissue Health as Related to Clasp Design in Implant Assisted Mandibular Distal Extension Removable Partial Overdentures.

Stresses Induced by Mesially and Distally Placed Implants to Retain a Mandibular Distal-Extension Removable Partial Overdenture: A Comparative Study

The present in vitro study compared the stresses transmitted to canine abutments and implants placed in either the first premolar or second molar areas for retaining removable partial overdentures in models of mandibular bilateral distal-extension with the six anterior teeth remaining. The study also compared horizontal to vertical reciprocation of bracing arms when the implants were placed mesially. Three overdenture models were used to represent two groups. In group 1, implants were placed bilaterally in the first premolar area (claspless denture); subgroup A dentures had horizontal reciprocal arms and subgroup B dentures had vertical reciprocal arms. In group 2, the implants were placed bilaterally in the second molar areas. Ball attachments were used to retain the partial overdenture. Eight strain gauges were cemented to the facial and lingual sides of each abutment (two canines and two implants). Static unilateral (right and left) and centric loads of 70 N were applied and the stresses were measured. All measurements were repeated five times for each loading impact, and means were calculated. Group 1A showed the highest stresses around the abutments, followed by group 1B, and the lowest stresses were found in group 2. Group 1 showed statistically significant increases in the stresses induced around the implants and the abutment teeth. For group 1, although there was no statistically significant difference between subgroups, subgroup B showed lower stresses around the abutments than subgroup A in both central and unilateral loading. A distally placed implant can be considered a more satisfactory solution than a mesially placed implant for retention of a mandibular distal-extension removable partial overdenture.

Jenis-jenis gigitiruan dukungan implan Implant-supported dentures

Dental implants, or completely said as dental implant bodies, function as analogues of tooth roots, achieving aunion directly with jawbone following their insertion into a prepared socket in the bone. Implant system have threebasic components, namely the dental implant body that is lying in the jawbone, abutment that lies on the jawboneand the prosthesis. Dental implants may stabilize a removable prosthesis, complete or partial overdentures, and orsupport and stabilize a fixed prosthesis. In designing implant-supported removable prostheses, there are three formsof anchorage frequently used, namely bar/sleeve (clip) joints which links two or more implants, ball/cap anchoragesapplied individually to two or more isolated implants, and magnets/magnetic keepers. Implant-supported fixedprosthesis is either screwed to or cemented on to the abutment.

Retention Strength of Cobalt-Chromium vs Nickel-Chromium Titanium vs CP Titanium in a Cast Framework Association of Removable Partial Overdenture

There is little information considering the framework association between cast clasps and attachments. The aim of this study was to evaluate the retention strength of frameworks match circumferential clasps and extra resilient attachment cast in three different alloys (cobalt-chromium, nickel-chromium titanium and commercially pure titanium), using two undercut (0.25 and 0.75 mm) and considering different period of time (0, 1/2, 1, 2, 3, 4 and 5 years). Using two metallic matrices, representing a partially edentulous mandibular right hemiarch with the first molar crown, canine root and without premolars, 60 frameworks were fabricated. Three groups (n = 20) of each metal were cast and each group was divided into two subgroups (n = 10), corresponding the molar undercut of 0.25 mm and 0.75 mm. The nylon male was positioned at the matrix and attached to the acrylic resin of the prosthetic base. The samples were subjected to an insertion and removal test under artificial saliva environment. The data were analyzed and compared with ANOVAs and Tukey's test at 95% of probability. The groups cast in cobaltchromium and nickel-chromium-titanium had the highest mean retention strength (5.58 N and 6.36 N respectively) without significant difference between them, but statistically different from the group cast in commercially pure titanium, which had the lowest mean retention strength in all the periods (3.46 N). The association frameworks using nickel-chromium- titanium and cobalt-chromium could be used with 0.25 mm and 0.75 mm of undercut, but the titanium samples seems to decrease the retention strength, mainly in the 0.75 mm undercut. The circumferential clasps cast in commercially pure titanium used in 0.75 mm undercuts have a potential risk of fractures, especially after the 2nd year of use. This in vitro study showed that the framework association between cast clasp and an extra resilient attachment are suitable to the three metals evaluated, but strongly suggest extra care with commercially pure titanium in undercut of 0.75 mm. Frameworks fabricated in Cp Ti tend to decrease in retentive strength over time and have a potential risk of fracture in less than 0.75 mm of undercut.

Rehabilitation of a Severely Worn Dentition using Fixed and Removable Partial Overdenture Prostheses

ABSTRACTPlanning and executing the restorative rehabilitation of a severely worn dentition is probably one of the most intellectually and technically demanding tasks faced by the restorative dentist. This article describes the rehabilitation of a 55-year-old male patient with severe loss of tooth structure. The maxillary arch was restored using fixed restorations and the mandibular arch using the integration of fixed and removable prosthodontics. The integration of fixed and removable prosthodontics in a partially dentate patient poses a challenge as well as an opportunity for the use of a partial overdenture.

Implant Supported Prosthesıs in a Patıent wıth Progerıa: Case Report

Prosthodontic rehabilitation can be accomplished with fixed, overdenture, complete, or implant-retained prostheses. Dental treatment overcomes the patient's functional, psychological, esthetic and phonation problems. Remaining healthy teeth may allow the dentist to fabricate a removable partial overdenture, fixed partial prosthesis or implant - supported prosthesis. The retention of a number of abutments helps maintain a positive ridge form with greater height and volume of the alveolar bone, improving masticatory performance, as well as providing a more stable prostheses. Dental patients who have medical problems need many treatment procedures. Multidisciplinary treatment planning is invaluable for patient's dental health. Progeria is a rare genetic condition where symptoms resembling aspects of aging are manifested at an early age. characteristic clinical findings of Progeria disease include abnormalities of the skin and hair in conjunction with characteristic facial features and skeletal abnormalities. The characteristic facies show protruding ears, beaked nose, thin lips with centrofacial cyanosis, prominent eyes, frontal and parietal bossing with pseudohydrocephaly, midface hypoplasia with micrognathia and large anterior fontanel. The other reported anomalies are dystrophic nails, hypertrophic scars and hypoplastic nipples. The findings that are nearly interested in dentistry are delayed dentition, anodontia, hypodontia, or crowding of teeth. This article presents the multidisciplinary dental treatment planning includes surgical, endodontic and prosthetic treatment of a patient with a history of progeria. In this case complete-arch fixed prostheses in both maxilla and mandible, supported by a combination of implants and teeth are reported.

Alternative esthetic and cost-effective therapy using a removable partial overdenture for the treatment of a patient with class III malocclusion

This clinical case describes the treatment of a patient with an Angle class III malocclusion using an removable partial overdenture (RPOD). This treatment was selected as it was minimally invasive, had relatively low laboratory costs and was a simple technique. Clinical results were functionally and esthetically satisfactory. The treatment combined orthodontic and prosthodontic treatment, requiring few clinical appointments as compared to other therapies.

Application of silica coating technique for removable prosthodontics. A clinical report

A technique for constructing a maxillary removable partial overdenture using the Silicoater system has been described.

Philosophies and Principles of Removable Partial Overdentures

Retention of remaining teeth for use as overdenture abutments has been widely used in the discipline of complete denture therapy, but has frequently been overlooked as a means of enhancing removable partial denture therapy. There are considerable advantages in retaining even severely compromised teeth that can be included in a treatment plan for providing removable partial overdentures. The value of such teeth in providing aesthetic improvement, residual bone retention, denture base support, primary or secondary retention, and improved stability should be of primary importance in treatment planning.

Removable Partial Overdentures with Natural Root Structure and Osseointegrated Fixtures

The development and refinement of osseointegration have had primary impetus in treatment of the totally edentulous patient. The same principles, however, may be applied to the partially edentulous patient. Osseointegrated fixtures used in conjunction with mechanical or magnetic attachments may be used to construct partial or full overdentures. This allows treatment with removable prosthodontics in many cases in which it is not practical to achieve anchorage for a fixed prosthesis.

Removable Partial Overdentures for the Irradiated Patient

Patients who have received radiotherapy to the head and neck area must avoid dental extractions and seek simplicity in treatment and home care follow-up. For partially edentulous patients, removable partial overdenture therapy can fulfill these goals while maintaining the high level of function and aesthetics desired by patients.

Removable Partial Overdentures with Mechanical (Precision) Attachments

Mechanical attachments for overdentures have been available in various forms for over a century. The explosive interest in osseointegration and the effort on the part of the profession to avoid the complete denture as a treatment modality has stirred the interest in positive retentive elements for overdentures represented by the mechanical stud and bar attachments. The cited references provide a resource as a trouble-free guide in the selection and use of the various stud and bar attachment systems. The clinical examples show a pattern of application not generally discussed by the manufacturers, illustrating the simplicity of use with the options for all attachments including magnets. The discussion on magnets comes from 9 years of clinical experience. Rare earth magnets provide excellent adjunct retention, and their assembly follows the same protocol and complexity as stud attachment systems. All magnets, at the present state of the art, have a corrosion potential with the exception of the Laser Sealed Units (Golden Dental, Golden, CO). Finally, the mechanics of the attachment overdenture serves as an excellent training field for the osseointegrated prosthesis, be it the classic Brånemark (Nobelpharma USA, Chicago, IL) restorative or the implant overdenture concept.

The Overdenture Concept

The biomechanical rationale for the treatment of patients with overdentures, and their advantages and disadvantages are presented. The indications and contraindications for the treatment of partially edentulous patients with removable partial overdentures are discussed. The patient's and dentist's responsibilities for the success of therapy are enumerated.

Removable Partial Overdentures: Clinical Considerations

Removable Partial Overdentures: Clinical Considerations

Removable Partial Overdentures for Special Patients

Removable partial overdentures are an option that should be considered by every dentist who is involved with cosmetic dentistry or dentistry for the older adult. The rationale, indications, and technique have been described for providing an aesthetic, functional prosthesis that is also conservative in nature. The reversibility of the procedure allows the patient the opportunity to pursue other forms of treatment should the result not meet his or her expectations. For appropriately selected special patients, the results can be extremely gratifying for both the patient and dentist.

Overdentures with Magnetic Attachments

Magnets were used only occasionally for dental purposes several decades ago. Since the advent of rare earth magnet alloys, however, intraoral magnets are shaping the course of aesthetics and retention for both complete and removable partial overdentures. Their benefits include simplicity, low cost, self-adjustment, inherent stress breaking, automatic reseating after denture displacement, comparative freedom of lateral denture movement, a low potential for trauma to the retained roots, and elimination of the need for adjustment in service. The clinical procedures involved in their application do not require any special skills, and the options offered by the various manufacturers give the dentist a wide variety of choices in selecting an appropriate treatment plan. Clinical experience has shown that magnetic retention offers an economical alternative for teeth that would otherwise require expensive or extensive restorative treatment, and can be used as an effective and often superior replacement for failed bridgework. Finally, it is clear that overdenture treatment per se is a valuable option for the dentist, and the use of magnets expands this option to the retention of tooth roots that might otherwise be scheduled for extraction. The natural tooth root, even if periodontally involved, can serve as a useful aid in denture support and retention, and should be regarded as at least as good as, and in most cases superior to, an implant. It is also much less expensive.

Periodontal Considerations of the Removable Partial Overdenture

1. An overdenture, whether complete or partial, is an excellent mode of treatment in the mutilated dentition for the preservation of the residual ridge. 2. Selection of patients for an overdenture should be based on past history of dental neglect, the status of the teeth and their periodontium, including present oral hygiene status, and patient motivation. The patients with a history of dental neglect, poor oral hygiene, and lack of motivation in having the teeth and the periodontium restored to health as well as strict compliance to a home-care regimen and recall schedule are not good candidates for treatment with an overdenture. 3. The choice of teeth or roots to serve as overdenture abutments must include their periodontal evaluation, which should consist of a detailed periodontal examination, diagnosis, prognosis, and treatment when this is indicated, including chemical protection (fluoride gel) and an oral hygiene regimen tailored to individual needs. 4. The knowledge and expertise in the selection and implementation of appropriate periodontal treatment modalities is of paramount importance in restoring optimum periodontal health to the overdenture abutments before overdenture fabrication. 5. The maintenance phase of the overdenture abutments as well as of the existing natural teeth is of critical importance in the preservation of health of these abutments and teeth. This maintenance phase should consist of periodic recalls based on individual needs; a detailed periodontal evaluation, including patient's motivation and status of oral hygiene and denture hygiene; and detection of caries. If necessary, appropriate periodontal and/or restorative therapy should be performed, and oral hygiene measures reinforced. This will ensure longevity of both abutment teeth or roots and of the existing natural teeth resulting in a long-term success of an overdenture. 6. Because there is evidence of high incidence of periodontal disease and dental caries in overdenture wearers, and because this evidence is attributed mainly to lack of motivation and compliance of adequate oral hygiene as well as to frequency of recall visits, patients should be made aware of the importance of their role in the maintenance phase of treatment and in the factors that lead to ultimate success of overdenture therapy. 7. With (a) proper selection of the patient and the abutment teeth, (b) adequate periodontal and restorative health and treatment to ensure optimum health prior to RPOD construction, (c) a well-designed home-care regimen and frequency of recalls, and (d) proper execution of maintenance care, changes for long-term success of overdenture therapy will be much improved.

Classification of Removable Partial Overdentures

Classification of Removable Partial Overdentures

Periodontal effects of removable partial overdenture prosthesis

Periodontal effects of removable partial overdenture prosthesis