Mostafa Elsayed Abdel Haleem F, Ahmed Gamal Ahmed Hassan, Emad M T Agamy And Gehan Fekry Mohammed .,

ABSTRACT
Statement Of Problem: Acetal Resin Has Been Introduced As An Esthetic Partial Denture Clasp And Framework Material. However, The Effects Of This Material On The Abutment Teeth Supporting Structures Were Not Clear.

Purpose: To Evaluate The Effects Of Acetal Resin Frame Work And Clasps On The Abutment Teeth Supporting Structures As Compared To Cobalt-chromium Frame Works And Clasps.

Materials and Methods: Fourteen Patients, 6 Males And 8 Females, With Kennedy Class I Partially Edentulous Maxilla And Dentulous Mandibles Were Selected For This Study. Patients Were Divided Randomly Into Two Equal Groups; Group 1 Received Maxillary Partial Denture With Acetal Resin Frameworks And Acetal Resin Clasps . Group 2 Received Maxillary Cobalt-chromium Partial Denture Frameworks With Cobalt-chromium Clasps. Bone Height And Density Of The Abutment Teeth Were Evaluated At Partial Denture Insertion And After 6 And 12 Months. Paired T-test Was Used At P < 0.05 To Assess The Changes In The Above Mentioned Parameters In Each Group. Student T-test Was Used To Compare Between The Two Groups.

Results: There Were Significantly Higher Reductions In Bone Height And In Bone Density In The Second Group Than That In The First Group. Conclusion: Acetal Resin Frameworks And Clasps Were Superior To Cobalt-chromium One Regarding Bone Resorption And Bone Density Around The Abutment Teeth. Clinical Implications: Based On The Changes Of The Studied Parameters ; Acetal Resin Clasp Abutments, It Could Be Used Successfully To Retain Partial Dentures.