Long‐term crestal bone changes in implants placed in augmented sinuses with minimal or moderate remaining alveolar bone: A 10‐year retrospective case‐series study

Abstract

ObjectivesTo evaluate long‐term clinical and radiographic outcomes of dental implants placed after lateral window sinus augmentation utilizing the sagittal sandwich technique.Materials and MethodsPatients treated with sinus augmentation were included in this retrospective case‐series study. The surgical procedure was performed with particulate autogenous bone‐ and anorganic bovine bone‐derived mineral (3:7 ratio). Implants were grouped based on baseline residual alveolar ridge height: group S (residual alveolar ridge height of 0.1–3.5 mm), group M (height of 3.5‐7mm), and group C (native bone). Radiographs were taken at baseline (abutment installation) and annually throughout the 10‐year follow‐up.ResultsA total of 86 patients (92 sinus lifts) and 209 implants were included. Ten sinus membrane perforations were recorded (11% incidence), and graft infections occurred in 3 cases (3.2% incidence). During the 10‐year follow‐up, 3 implants (1.4%) failed. No significant differences in the mean implant marginal bone loss (MBL) between the three groups were found after 1‐, 2‐, and 5‐year follow‐up (p > .05). At 10 years, group C exhibited more MBL than group M with a mean difference of −0.53 mm (p = .01). After 10 years, MK III implants displayed significantly more bone loss in native bone than those in augmented bone with a mean difference of 0.48 mm (p = .02). Five patients and 7 implants developed peri‐implantitis with no significant differences between the groups (p = .570).ConclusionImplant placement after two‐stage sinus grafting utilizing the sagittal sandwich technique is a relatively safe and predictable procedure with minimal complications and MBL after 10‐year follow‐up.

A Histologic, Histomorphometric, and Immunohistochemical Evaluation of Anorganic Bovine Bone and Injectable Biphasic Calcium Phosphate in Humans: A Randomized Clinical Trial

“…The absorption of bovine bone HA is active but seems to be very slow. Indeed, the material is degraded more slowly than it is resorbed [ 40 , 41 , 42 ]. A bone biopsy after alveolar ridge augmentation confirms that particles of bone graft substitute of bovine origin can be found up to 10 years after the procedure.…”

Latest Findings of the Regenerative Materials Application in Periodontal and Peri-Implant Surgery: A Scoping Review

“…The studies were from four categories: controlled intervention studies [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ], observational cohort and cross-sectional studies [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ], and case series/case reports studies [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ].…”

“…Particulate ABG and inorganic minerals derived from bovine bone with a 3:7 ratio can be used to perform the sagittal sandwich technique in sinus lift, providing some safety and predictability in the subsequent implant placement [ 52 ]. In contrast, the application of allogenic bone blocks grafts to increase pre-implant bone thickness is associated with frequent complications such as graft loss and/or peri-implantitis [ 53 ].…”

Sinus augmentation procedure via the lateral window technique—Reducing invasiveness and preventing complications: A narrative review

“…Post-operatively, acute or chronic sinusitis, 127 while being rare, 23,128,129 could develop. This type of complication occurs in patients with a predisposition for these conditions 130 Therefore, the surgical team must be able to detect any predisposition for this condition and to refer the patient to the ear/nose/throat (ENT) physician, for consultation to manage the risk (functional endoscopic sinus surgery [FESS] procedure, etc.)…”