Effect of Implant Angulation on Attachment Retention in Mandibular Two‐Implant Overdentures: A Clinical Study

Abstract

Increased interimplant angulation appears to have higher impact on the retention of LA than of RA attachments. The effect of larger interimplant angulation on the loss of attachment retention and its clinical implications should be further assessed.

Five‐year study of mandibular overdentures on stud abutments: Clinical outcome, patient satisfaction and prosthetic maintenance—Influence of bone resorption and implant position

“…Other short-term clinical research observed only a negative impact of higher sagittal inter-implant angles on the retention (Jabbour et al, 2014). The parallel implant position should reduce the number of visits, which are time-consuming for both patient and clinician.…”

“…On the other hand, other studies found no effect of the inter-implant distance on both the quality of the dentures and the patient satisfaction (Alfadda, Al Amri, Al-Ohali, Al-Hakami, & Al-Madhi, 2017). Based on in vitro and in vivo research, the effect of inter-implant angulation on retention and wear of a stud retained 2IOD is inconclusive (ELsyad, Hatem, Shawky, & Emera, 2018;Jabbour et al, 2014;Kobayashi et al, 2014;Kurtulus & Gurbulak, 2018;Stephens, di Vitale, O'Sullivan, & McDonald, 2014).…”

“…On the other hand, other studies found no effect of the inter‐implant distance on both the quality of the dentures and the patient satisfaction (Alfadda, Al Amri, Al‐Ohali, Al‐Hakami, & Al‐Madhi, ). Based on in vitro and in vivo research, the effect of inter‐implant angulation on retention and wear of a stud retained 2IOD is inconclusive (ELsyad, Hatem, Shawky, & Emera, ; Jabbour et al, ; Kobayashi et al, ; Kurtulus & Gurbulak, ; Stephens, di Vitale, O'Sullivan, & McDonald, ). More retention loss was reported for a stud 2IOD compared to bar, ball and PEEK (polyether ether ketone) attachments in the presence of higher inter‐implant angulations (Aroso et al, ; Choi, Yun, Jeong, & Huh, ; Kurtulus & Gurbulak, ; Srinivasan et al, ; Sultana, Bartlett, & Suleiman, ).…”

Effect of Distal Implant Inclination on Dislodging Forces of Different Locator Attachments Used for Mandibular Overdentures: An In Vitro Study

“…Moreover, Locators have a low profile and can be used with inadequate interridge space to reduce denture base fracture . In addition, they can compensate for implant angulation . The manufacturers recommend the use of conventional Locator inserts (with double frictional flanges) where interimplant angles are in the range of 0° to 20°.…”

“…The manufacturers recommend the use of conventional Locator inserts (with double frictional flanges) where interimplant angles are in the range of 0° to 20°. Extended range inserts (with external frictional flange only) are recommended for use where interimplant angles exceed 20° . However, Locator inserts are not resistant to wear and show reduced retention clinically compared to ball attachments…”