Mandibular bone height changes in two different design concepts of four implant assisted overdenture

Doaa Elmowafy,Nessreen Elmekkawy,Mohamed M Fouad,Mohamed Elgamal

doi:10.18535/ijsrm/v9i05.mp02

Doaa Elmowafy, Nessreen Elmekkawy + Show 2 more

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https://doi.org/10.18535/ijsrm/v9i05.mp02

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Abstract

Purpose: This comparative study was conducted to compare between two different design concepts of four implant assisted complete mandibular overdenture regarding the residual alveolar bone height changes.Materials and Methods: Ten healthy completely edentulous male patients were selected for this study. For each patient, a conventional complete denture was constructed. Each mandibular denture was duplicated to be used as a radiographic stent, then the CBCT surgical guide template was printed according to each design concept of 4-implant overdenture. The CBCT surgical guide templates were used for installing the implants according to flapless surgical technique followed by delayed loading. According to the two design concepts of the 4-implant overdenture used in this study, the patients were randomly classified into two equal groups: group [A]had two vertical canine implants with two axial 1st molar short implants (short design concept), and group [B]had two vertical canine implants with two distally inclined premolar implants (inclined design concept). Radiographic evaluations were performed immediately (T0), 6 months (T6), and 12 months (T12) respectively after picking up of the ball attachments.

Highlights

Conventional complete dentures have been the standard option of care for more than a century
MP-2021-354 option to complete denture, it’s problems of poor implant support and stability, mandibular ridge resorption distal to the implants due to stresses transmitted to the ridge as a result of rotation of the denture around the anterior implants and increase the rate of attachment wearing during function[4]
Material and Methods: Ten healthy completely edentulous male patients were selected from the outpatient clinic of Prosthodontics Department according to the following criteria: all patients have sufficient mandibular residual alveolar ridges bone of type D3 at least verified by C.B.C.T, one year at least after last extraction, covered with even thickness, firm healthy mucosa, with no previous denture history, Angle’s class I maxillomandibular relation, adequate restorative space verified by putty index method

Summary

Introduction

Conventional complete dentures have been the standard option of care for more than a century. With the aid of dental implant, alternative treatment options can be used for edentulous patient: implant assisted overdentures, and implant supported fixed dental prostheses (fixed dentures)[3]. The number and distribution of loaded implants affect the supporting residual alveolar bone. The use of two implants to assist the mandibular complete overdentures is commonly accepted as alternative treatment. MP-2021-354 option to complete denture, it’s problems of poor implant support and stability, mandibular ridge resorption distal to the implants due to stresses transmitted to the ridge as a result of rotation of the denture around the anterior implants and increase the rate of attachment wearing during function[4]. Adding two posterior implants may increase the support of the denture and prevent its rotational movements. The inferior alveolar nerve and associated structures may provide minimal bone for implant anchorage or prevent the placement of implants distal to the mental foramina[5]

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