Combination of straight and tilted implants for supporting screw-retained dental prostheses in atrophic posterior maxillae: A 2-year prospective study. (August 2017)

• Record Type: Journal Article
• Authors: Casar-Espinosa, Juan-Carlos; Castillo-Oyagüe, Raquel; Serrera-Figallo, María Ángeles; Garrido-Serrano, Roberto; Lynch, Christopher D.; Menéndez-Collar, Manuel; Torres-Lagares, Daniel; Gutiérrez-Pérez, José-Luis
• Is Part Of: Journal of dentistry. Volume 63(2017:Aug.)
• Page Start: 85
• Page End: 93
• Publication Date: 2017-08
• Subjects: Tilted implants -- Angled implants -- Straight implants -- Axial implants -- Fixed dental prostheses (FDPs) -- Atrophic maxilla; Dentistry -- Periodicals; Dentistry -- Periodicals; Dentisterie -- Périodiques; Electronic journals; 617.6005
• DOI: 10.1016/j.jdent.2017.05.022
• Languages: English
• ISSNs: 0300-5712

Abstract

Abstract: Objectives: To evaluate the two-year survival rate (SR) and marginal bone loss (MBL) of fixed dental prostheses (FDPs) supported by straight (S) and tilted (T) implants under the influence of diverse study variables. Methods: A prospective investigation comprising 21 patients provided with a total of 27 maxillary screw-retained restorations fixed to 70 dental implants was developed. Two groups of implants were considered depending on their inclination with respect to the occlusal plane: Group 1 (S, n = 37): straight/axial implants and Group 2 (T, n = 33): tilted/angled fixations. Each FDP was supported by a combination of S and T implants. SR and MBL were assessed at the time of loading and two years after surgery. Patient-, surgical- and/or rehabilitation-related information was gathered. Data were statistically analysed at the α = 0.05 significance level. Results: After 24 months, a 100% SR was achieved and the MBL of S and T implants were statistically similar. T implants located in the molar region showed lower MBL than did those replacing premolars ( p = 0.031). Conclusions: Upright and angled fixations inserted at posterior maxillary areas resulted in comparable survival rates and peri-implant MBL after two years. The marginal bone resorption around tilted implants depended on their location. Clinical significance: Screw-retained restorations fixed to straight and tilted implants seem to be a safe treatment option in posterior atrophic maxillae.