Behr M, Hindelang U, Rosentritt M, Lang R, Handel G
Department of Prosthodontics, University of Regensburg, 93042 Regensburg, Germany.
Clin Oral Investig. 2000 Mar;4(1):25-30. doi: 10.1007/s007840050109.
The objective was to investigate associations between the results of an in vitro and an in vivo study using an artificial mouth and a study of adhesive fixed partial dentures (AFPD) begun in 1985 [1]. Twenty extracted human molars and 20 human upper incisors were inserted into PMMA resin, 6 mm apart to represent a gap. Two preparation methods (identical to those in in vivo conditions) were used: a retentive preparation technique (posterior) and a non-retentive preparation technique (anterior). The frameworks of the bridges consisted of CoCr-alloy with a ceramic veneered pontic to replace the missing tooth. The bonding surfaces of the posterior AFPDs were conditioned with a tribochemical system, while the anterior AFPDs were sandblasted. All AFPDs were inserted using a dual curing composite cement. During thermal-cycling and mechanical loading (TCML: 6000 x 5 degrees C, 1.2 x 10(6) x 50 N, 1.66 Hz) in an artificial environment, the frequency and type of failures were observed. The above mentioned loading parameters were hypothesized to represent a period of 5 years under oral conditions. The results were compared to those of similar bridge-types in the in vivo study. The Kaplan-Meier estimations showed similar graphs for in vivo and in vitro with both types of AFPDs. In vivo and in vitro, the retentively prepared AFPDs were markedly more successful. With regard to the failure types, the simulation-parameters seemed to represent a loading stress that was comparable to in vivo conditions.
目的是研究使用人工口腔进行的体外研究和体内研究结果之间的关联，以及一项始于1985年的粘结固定局部义齿（AFPD）研究[1]。将20颗拔除的人类磨牙和20颗人类上颌切牙插入聚甲基丙烯酸甲酯树脂中，相距6毫米以代表一个间隙。使用了两种制备方法（与体内条件相同）：固位制备技术（后牙）和非固位制备技术（前牙）。桥体的框架由钴铬合金制成，带有陶瓷贴面桥体以替代缺失牙。后牙AFPD的粘结面用摩擦化学系统处理，而前牙AFPD则进行喷砂处理。所有AFPD均使用双固化复合树脂粘结剂插入。在人工环境中进行热循环和机械加载（TCML：6000次5℃循环，1.2×10⁶次50N循环，1.66Hz）期间，观察失败的频率和类型。上述加载参数被假设为代表口腔条件下5年的时间段。将结果与体内研究中类似桥体类型的结果进行比较。Kaplan-Meier估计显示，两种类型的AFPD在体内和体外的图表相似。在体内和体外，采用固位制备的AFPD明显更成功。关于失败类型，模拟参数似乎代表了与体内条件相当的加载应力。
