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Table of Contents
Year : 2019  |  Volume : 9  |  Issue : 1  |  Page : 41-45

Root-supported overdenture as a prosthetic alternative for patients undergoing the transitional phase from partial to complete edentulism

1 Department of Restorative Dentistry, Univ Estadual Paulista, Araçatuba; Department Unipos-Dentistry, Centro Universitário do Norte Paulista, UNORP, São José do Rio Preto, São Paulo, Brazil
2 Department of Restorative Dentistry, Univ Estadual Paulista, Araçatuba, Brazil
3 Post-Graduation Program in Dental Prosthodontics, Innovation School, Natal, RN, Brazil
4 Department of Dentistry, Universidade Federal do Rio Grande do Norte, UFRN, Natal, São Paulo, Brazil
5 Department of Dental Materials and Prosthodontics, Univ Estadual Paulista, Araçatuba, Brazil

Date of Web Publication17-Jun-2019

Correspondence Address:
Dr. Rodolfo Bruniera Anchieta
Department of Restorative Dentistry, Sao Paulo State University, Univ Estadual Paulista, Araçatuba, SP 16015-050
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jdi.jdi_17_18

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The objecitve of present article, is show through a clinical case the importance of preserving te remaining teeth in oral rehabilitation of elderly people, durinf the transitional phase from partial to complete edentulism. After careful planning, prosthetic rehabilitation was developed with the use of the remaining teeth that had excellent bone and periodontal implantation. In addition to root-supported overdenture provide better retention, stability, and comfort when compared to conventional full dentures, also help in the preservation of the alveolar ridge in the long term. The maintenance of the remaining roots for fabrication of overdentures allows future treatment with osseointegrated implants without the need for invasive surgical procedures for reconstruction.

Keywords: Complete edentulism, preservation of the alveolar, root-supported overdenture

How to cite this article:
Anchieta RB, Endo Hoshino IA, Freitas Júnior AC, de Almeida EO, Rocha EP, Assunção WG. Root-supported overdenture as a prosthetic alternative for patients undergoing the transitional phase from partial to complete edentulism. J Dent Implant 2019;9:41-5

How to cite this URL:
Anchieta RB, Endo Hoshino IA, Freitas Júnior AC, de Almeida EO, Rocha EP, Assunção WG. Root-supported overdenture as a prosthetic alternative for patients undergoing the transitional phase from partial to complete edentulism. J Dent Implant [serial online] 2019 [cited 2021 Jan 20];9:41-5. Available from:

   Introduction Top

Before implants became a regular prosthetic therapy, remaining roots were maintained and used to prevent residual ridge resorption and discomfort with complete dentures.[1],[2] However, the treatment with implants has raised a question about the fabrication of root-supported overdentures since some studies indicate limited prognosis for remaining roots because of their greater susceptibility to caries and periodontal problems.[3],[4] On the other hand, another study showed that periodontally healthy teeth present better survival rate than implants.[2],[5]

Hence, the maintenance of teeth or roots for fabrication of overdentures has been requested mainly by elderly since this population usually presents systemic disorders or limited financial support that may preclude the treatment with osseointegrated implants.[6],[7],[8] In this context, Brkovic-Popovic et al.[9] demonstrated no significant ridge resorption surrounding the abutments in patients wearing root-supported overdentures.[10],[11],[12]

According to this, the aim of this study was to present the importance of preserving the remaining teeth in patients during the transitional phase from partial to complete edentulism through preservation of the alveolar ridge after a 3-year follow-up in an elderly patient.

   Case Report Top

A 62-year-old female patient attended the dental clinic, complaining about the esthetics and retention of the maxillary and mandibular dentures. The clinical examination revealed that the mandibular arch featured a Kennedy Class I with the right canine to the left canine and a removable partial denture with clips broken. The maxilla (Kennedy Class II subdivision 2) was rehabilitated with a provisional removable partial denture [Figure 1] and [Figure 2].
Figure 1: Initial aspect of the patient showing maxillary alveolar ridge with the remaining roots (canine, second premolar, and first molar of the opposite hemiarch)

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Figure 2: Mandibular removable partial denture with the left circumferential clasp broken. Maxillary provisional removable partial denture

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The patient also presented reduced interocclusal distance [Figure 3] and three endodontically treated maxillary roots restored with amalgam (right canine, right second premolar, and left first molar). The planning was based on the patient's expectations, oral characteristic, and financial limitations.
Figure 3: Lateral view showing unsatisfactory space for insertion of attachment system

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It was suggested fabrication of a mandibular removable partial denture and a maxillary overdenture with metallic caps on the roots. The maxillary root-supported overdenture was chosen as a treatment alternative due to the limited economic status of the patient, which avoids the therapy with dental implants and implant-supported prostheses. The metallic caps were selected based on the reduced interocclusal distance, counterindicating the use of attachment systems.

After the approval of the treatment planning by the patient, the mandibular study cast was obtained by impression with alginate (Hydrogum, Zhermack SpA Polesine Badia, Italy). The root canals were prepared with Largo drills and the remaining roots were prepared with diamond burs. Thereafter, the impression of the maxillary arch and root canals was made with polyvinyl siloxane (Express, 3M/ESPE, St. Paul, Minnesota, USA) to obtain the metallic caps.

The metallic caps were cemented with zinc phosphate cement (ESP Durelon, Seefeld, Germany) [Figure 4] and a new impression of the maxillary arch was conducted. Then, the casts were mounted in a semiadjustable articulator after interocclusal record [Figure 5].
Figure 4: Maxillary alveolar ridge with the remaining roots (canine, second premolar, and first molar of the opposite hemiarch) covered with metallic caps

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Figure 5: Interocclusal record

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The artificial teeth were mounted on both prostheses [Figure 6] and clinical trials were carried out to evaluate esthetics and patient's comfort with the new vertical dimension of occlusion.
Figure 6: Artificial tooth mounted on wax for both prostheses

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After clinical evaluation and approval by the patient, the dentures were processed. The resin base and occlusal surfaces of both dentures were adjusted to establish the bilateral balanced occlusion.

The patient returned for adjustments after every 15 days until the 3rd month following the dentures insertion [Figure 7] and [Figure 8]. After a 3-year follow-up, the prostheses were appropriate and the maxillary ridge presented no clinical sign of bone resorption [Figure 9].
Figure 7: Initial aspect after the installation of maxillary overdenture

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Figure 8: Occlusal view of the maxillary prosthesis showing the space in the acrylic resin base for the metal caps

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Figure 9: Occlusal view of the remaining alveolar ridge after 3 years of overdenture insertion

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   Discussion Top

For more than 100 years, conventional dentures were the only available treatment for edentulism.[13],[14] This conventional treatment relies on the retention and support provided by the remaining alveolar ridge.[15]

The success of treatment with conventional complete dentures is variable and depends on the patient's capacity to overcome the limitations of complete dentures through an adaptive process.[16],[17],[18]

The treatment with overdentures improves stability, retention, bite force, chewing efficiency, and oral health that may be associated with the quality of life in patients with severe problems for adapting with conventional dentures.[15],[19],[20],[21],[22]

According to this, the maintenance of remaining roots prevents alveolar bone resorption, improves load transmission from the prosthesis to alveolar bone, maintains sensory feedback, and improves dentures stability.[23]

In general, the higher the number of roots used to support the dentures, the greater the potential for success with overdentures.[9],[24],[25] Similarly, the higher number of roots increases the sensory feedback of the patient. This results from the maintenance of the sensorial receptors of the periodontal ligament. Receptors of the periodontal ligament in dentate subjects contribute to the coordination of motor activity when chewing since objects of minimal thickness (<20 μm) are detected.[26],[27]

The maintenance of only three roots [Figure 9] and [Figure 10] was enough to significantly increase the stability of a maxillary complete denture even without attachment systems on the roots due to unsatisfactory intermaxillary space.
Figure 10: The remaining teeth are distributed in a polygonal configuration (triangle) of stabilization

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In addition, it was possible to preserve the volume and architecture of the alveolar ridge after 3 years of insertion of the root-supported overdenture. This fact is important mainly when rehabilitation with osseointegrated implants can be planned in the future.[28]

Sometimes, this treatment only retards the condition of the partially dentate patient to the situation of complete edentulism. This is suggested since many studies have reported a limited prognostic for this treatment due to problems as caries, periodontal disease, and fracture of abutment teeth.[29],[30]

However, caries was only a minor problem in this kind of treatment, as it could be completely inhibited through use of a daily application of chlorhexidine-fluoride gel and other problems could be controlled with periodical visits to the dentist.[3]

Nevertheless, if all options for control of root-supported overdentures will not be efficient for its function, other prosthetic alternatives with adequate prognostic may be indicated, such as conventional complete denture or implant-supported/retained denture since the roots tend to preserve the alveolar ridge and minimize the resorption.[31],[32],[33],[34],[35]

   Conclusions Top

The roots maintenance for fabrication of overdentures is a low-cost and feasible alternative that improves the patients' quality of life. The preservation of the alveolar ridge resultant from maintenance of the remaining roots increased prosthesis support and stability and patient's comfort.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Financial support and sponsorship


Conflicts of interest

There are no conflicts of interest.

   References Top

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  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8], [Figure 9], [Figure 10]


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