Effect ofDifferent Treatment Protocols forMandibular Kennedy Class II Cases Using OT Attachment ontheSupporting Structures

Abstract

Attachment-retained mandibular partial dentures have proved themselves to be logical methods to maintain oral function, contribute to the preservation of residual ridges and abutments, improvement of masticatory function, patient satisfaction, and to delay future Prosthodontic problems. This study aimed to evaluate attachment retained partial dentures concepts (double & single OT) and its effect on the abutment and the residual ridge. Parallel radiographic technique was carried out for all patients to assess the bone loss around the abutment and at the saddle area. Fourteen patients were selected from outpatient clinic of Prosthodontic Department, Faculty of Dentistry; Ain shams University to participate in this study. Patients were precisely selected and thoroughly examined in an attempt to reduce human variables and eliminate any factor that might adversely affect the results of this study. The patients had unilateral mandibular distal extension edentulous ridge (Kennedy Class II) opposing maxillary complete dentition with normal occlusion (Angle Class I) The present study was designed to compare the effect of using unilateral double OT attachment versus Bilateral single OT attachment in unilateral mandibular distal extension edentulous area (Kennedy Class II) on the supporting structures by using parallel radiographic technique. The patients divided randomly into two equal groups:  Group A: Patients were rehabilitated with mandibular double unilateral OT attachment retained partial denture.  Group B: Patients were rehabilitated with mandibular single bilateral OT attachment retained partial denture. Follow-up visits were scheduled at time of denture insertion, six, and twelve months for inspection of the prosthesis and radiographic evaluation of the bone height changes around the abutment and at saddle area.

-The results obtained from this study showed that:-

 All patients participated in the study were satisfied with their attachment retained mandibular partial dentures and accommodated to their use easily.  Bone resorption around the last abutment and at saddle area was increased gradually during the whole follow-up periodin the two groups, while rate of resorption at the second six months of the follow-up was higher than that of the first six months of the follow-up.  At the end of the 12 months, At mesial of second premolar, bone resorption in the two groups was the same, while at distal of second premolar bone resorption in group A more than that of group B, but bone resorption in group B more than that of group A at saddle area. And the difference in bone resorption between the two groups at the three areas was statistically insignificant.