دراسة مقارنة للكثافة العظمية الشعاعية حول الدعامة السنية والزرعة المرتبطة بجسر بشكل صلب او غير صلب

Background & Objective: Isthe radiographic bone density bigger at the area of implant orof tooth?and is thisdensity changingafter one year of function betweentooth and implant connected with bridge? the aim of the studyis tostudythe changing of radiographic bone density during one year of radial observation of the bone area around the tooth and implant connected with bridge with 3 units(rigid or non-rigid connection) depending on digital periapical radiographic. Material & methods: 50 ceramometal fixed partial prosthesiswith three unetswere placed on50 implants(Anthofit®ol -Anthogyr) connectedwith natural tooth in the posterior region of the mandible, for(48) patients(27 Prosthesis for males and23for females,age range(25-56 years) in faculty of dentistry, Damascus University. All patients did not take any drugs which affecting on bone as (corticostiroiad drugs).They were divided into two groups:the first received(30)fixed partial prosthesis connect a natural tooth to implant by rigid connection.the second received(20)fixed partial prosthesisconnect a natural tooth to implant by non-rigid connection, (key and key way) which was placed distal of the tooth. We took a traditional periapical radiography for every case at the time of cemented the bridge in two groups (T0)(it was changed into digital photo), then we took 3 digitalperiapical radiography by sensor after one year(T1).We made the measurement of bone density to both sides (mesial&distal)of tooth & implant in two groups and during the time of observation by using a special program which was(Medical Digora). Results: the mean values ofradiographic bone density at implant at the time of cementationand after one year of function in two groups is(146.29-143.25/149.52-140.94),and at tooth is(80.97-72.66/82.62- 67.52).AndT student test showed a significant difference between themat P≤0,05. Conclusion: Theradiographic bone density at the time of observation (T0,T1) at the implant is bigger than that of the tooth whatever the kind of prosthesis which connected tooth and implant(rigid or non-rigid connection).