Methods : Evaluation of patients undergoing placement of zygomatic implants (2)
The hypothesis of this study was to analyze if Stella and Warner’s technique have high survival rates and their rehabilitation have similar satisfaction when compared to total fixed prostheses with conventional implants.
Radiographic evaluation
Panoramic and periapical radiographs were obtained for conventional and zygomatic implants in group I (Figs. 2.a.b and 3). The purpose was to evaluate the bone level for the conventional implants, considering that up to two thirds of the total length of the implant would be acceptable as a standard of osteointegration. A ruler template with the respective magnifications was used, considering 25 to 0 % for panoramic and periapical radiographs, respectively. Additionally, the radiographic criteria recommended by Buser et al. were included to determine the success of the implants. These criteria consist of the absence of persistent radiolucency around the implant. The zygomatic implants were assessed only to verify their correct position, with acceptable maintenance of the apical third of the implant inside the zygomatic bone or small apical exteriorizations that did not exceed 1 mm, evaluated by a cone-beam CT scan (Figs. 4 and 5). A single and calibrated investigator collected the data in two different occasions.
Methods
This retrospective cohort study was submitted and approved by the Hospital Research Ethics Committee, receiving the registration number 137/201.
The sample consisted of 28 patients (21 females and 7 males), with age ranging from 46 to 63 years, and all of them have undergone either the placement of zygomatic implants using the Stella and Warner’s technique or conventional implants, in the period from 2007 to 2014 at the Oral-Maxillofacial Surgery and Traumatology Sector of the Onofre Lopes University Hospital. The patients were divided into two groups: group I comprised 14 patients who underwent surgery for installation of zygomatic implants by the Stella and Warner’s technique, rehabilitated with implant-supported fixed dentures, and group II consisting of 14 patients who were rehabilitated with total implant-supported fixed prosthesis, using conventional implants only, without the need of zygomatic implants.
Serial posts:
- Evaluation of patients undergoing placement of zygomatic implants using sinus slot technique
- Background : Evaluation of patients undergoing placement of zygomatic implants
- Methods : Evaluation of patients undergoing placement of zygomatic implants (1)
- Methods : Evaluation of patients undergoing placement of zygomatic implants (2)
- Methods : Evaluation of patients undergoing placement of zygomatic implants (3)
- Methods : Evaluation of patients undergoing placement of zygomatic implants (4)
- Methods : Evaluation of patients undergoing placement of zygomatic implants (5)
- Results : Evaluation of patients undergoing placement of zygomatic implants (1)
- Results : Evaluation of patients undergoing placement of zygomatic implants (2)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (1)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (2)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (3)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (4)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (5)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (6)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (7)
- Discussion : Evaluation of patients undergoing placement of zygomatic implants (8)
- Reference : Evaluation of patients undergoing placement of zygomatic implants (8)
- Figure 1. a Brånemark technique. b Sinus slot technique. c Extrasinus technique
- Figure 2. Periapical radiographs using the parallelism technique
- Figure 3. Panoramic radiograph showing bone level maintenance around the conventional implants
- Figure 4. Coronal slice from the CBCT showing implant apical third inside the zygomatic bone
- Figure 5. Coronal slice from the CBCT showing small exteriorization of a zygomatic implant apex
- Figure 6. Zygomatic implant probing using a WHO periodontal probe
- Figure 7. Visual analog scale—patient version
- Figure 8. Visual analog scale—evaluator version
- Table 1 Statistical analysis of individual parameters