الفهرس 
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Abstract
The common aetiological factors for acquired defects of the palate are cancer and traumatic injury. The primary goal of prosthetic obturation is closure of the maxillectomy defect and separation of the oral cavity from the sino-nasal cavities in order to prevent hyper-nasal speech and liquid leakage into the nasal cavity.
of maxillectomy patients can be challenging for both patients and prosthodontist and the difficulty with prosthesis retention is a very important concern for maxillectomy patients. The majority of maxillary defects can be rehabilitated with conventional simple obturator prosthesis, however, inadequate retention, stability and support may be associated with the use of an obturator. Telescopic crowns as well as conical crowns are universally established and widely spread for this indication, high degree of intraoral comfort and a good long-term viability was provided by conical and telescopic systems.
This is a prospective study included a total of Sixteen patients with maxillary acquired defect, were selected from the clinic of removable prosthodontic department, faculty of dentistry, Minia University. The patients received maxillofacial obturator. and were divided into two groups:
group (I): Clasping group: received conventional clasping obturator.
group (II): Telescopic group: received telescopic retained obturator.
The patients were followed up clinically and radiographically after denture delivery at 3, 6,9 and 12 months. The aim of this study is to compare conventional clasping to telescopic attachment in maxillary obturator for the treatment of unilateral maxillectomy cases.
The inclusion criteria was the presence of remaining maxillary teeth adequate for placing conventional definitive obturator and no history or planning for radiation therapy. While exclusion criteria are smokers, tumor recurrence, and patients have systemic metabolic diseases. Patient’s selection criteria were directed to avoid any condition that may interfere with normal bone metabolism or complicates surgical treatment and this was done using comprehensive medical history, clinical examination and laboratory investigation.