Evaluation of Dental Implant Stability Regarding All-on-4 Concept Utilizing Two Different Angles
Keywords:All-on-4, Implant stability and Dental implant.
Background: The “All-on-4” technique using 4 implants that has gained popularity in full arch edentulism
cases in recent years was presented as a modern technique in implant-denture rehabilitation by Malo in
Lisbon, Portugal, for the first time in 2003 and the all-on-four concept that began to be used in atrophic full
arch mandibular and in the maxilla in 2005 has emerged.
Aim: evaluation of dental implant stability in relation to All-on-4 concept.
Materials and Methods: This was a clinical prospective comparative study organized from February 2019
to March 2020 in the College of Dentistry Teaching Hospital, Department of Oral & Maxillofacial Surgery/
Dental Implant Unit/University of Baghdad. A total of 15 Iraqi patients aged 41-73 years, 9 males & 6
females were enrolled in this study receiving 80 Dental implants (All-on-4 concept). Patients classified into
two groups, group A (All-on-4 with 2 anterior axial and 2 posterior with angulation of 17°) and group B
(All-on-4 with 2 anterior axial and 2 posterior with angulation of 30°). For both, the surgical site of dental
implant was examined for the hard and soft tissues clinically and radiographically utilizing OPG and CBCT.
Results: The mean of ISQ values obtained in this study at each time point in the total dental implant,
axially placed and angled implant stability demonstrated significant increase (P = 0.000, 0.031 and 0.004)
respectively at different times. There was a significant increase in the mean stability of axial and angled
implants concerning males (P = 0.001 and P =0.002) respectively than females. Significant correlation
between implant stability and the regions at the three times periods. There was a significant difference in
angled implants stability between different intervals (P = 0.001) in patients >50y. Success of dental implants
Conclusion: All-on-4–style full-arch dental implant procedures have one of the highest success rates of
dental treatment; the dental implant stability had significant effect in mandible in comparison to maxilla.
There was irrelevant clinical analysis result in comparison to the statical analysis in relation to stability with
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