title: Compressive resistance of abutments with different diameters and transmucosal heights in Morse-taper implants.
abstract: The aim of this study was to evaluate the compressive resistance under oblique loads of abutments with two different diameters and transmucosal heights used for cement-retained implant-supported prostheses in Morse-taper implants. Forty Morse-taper implants were divided into four groups with different abutment sizes for cement-retained prostheses in order to perform the compressive test. The groups were divided by abutment diameter and transmucosal height as follows: Group 1: 4.5 x 2.5 mm; Group 2: 4.5 x 3.5 mm; Group 3: 3.3 x 2.5 mm; and Group 4: 3.3 x 3.5 mm. An oblique compressive loading test was performed on each sample located in a platform at 30° using a universal testing machine with a load cell of 1,000 kgf and 0.5 mm/min speed until achieving the deformation of abutment's neck. The compressive resistance and its mechanical behavior were recorded for each group and the data were analyzed using ANOVA, the Shapiro-Wilk and Scheffé tests. In addition, the detailed damage of all samples was recorded with a conventional camera linked to the endoscopic equipment. Significant differences were observed among the groups, except between Groups 2 and 3 (p>0.005). All the abutments showed permanent deformations in the upper region and at the transmucosal portion, but the threads of the screws were intact. Fractures were only identified in Groups 3 and 4. Stronger mechanical behavior and compressive resistance was observed in the abutments with 4.5 mm diameter and 2.5 mm transmucosal height.
authors.affiliation: Faculty of Dentistry, Universidad Mayor, Santiago, Chile.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Lillo
authors.affiliation: Faculty of Dentistry, Universidad Mayor, Santiago, Chile.
authors.forename: Carlos
authors.initials: C
authors.lastname: Parra
authors.affiliation: Dental School, CIMOFIR Research Centre, Universidad de La Frontera, Temuco, Chile.
authors.forename: Ramón
authors.initials: R
authors.lastname: Fuentes
authors.affiliation: Dental School, CIMOFIR Research Centre, Universidad de La Frontera, Temuco, Chile.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Borie
authors.affiliation: Department of Oral and Maxillofacial Surgery, University of Göttingen, Germany, Germany.
authors.forename: Wilfried
authors.initials: W
authors.lastname: Engelke
authors.affiliation: Dental School, CIMOFIR Research Centre, Universidad de La Frontera, Temuco, Chile.
authors.forename: Víctor
authors.initials: V
authors.lastname: Beltrán
mesh_terms: D000044:Dental Abutments; D003738:Dental Cements; D059605:Dental Implant-Abutment Design; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D008422:Materials Testing; D013314:Stress, Mechanical
chemical_list: D003738:Dental Cements