1/24 CIDRR- Mazzocco

Question 1

How does masseter msucle cross-sectional area relate to late implant failure?

Takashima et al. IJOI

Answer 1

Retrospective case-control study.

Included all patients who received implants at Niigata University HOspital from 2009-2019.

Case Control:
* Control (n=82) : Patients with no implant failures.
* Case (n=25) : Patients with at least 1 late implant failure

The masseter muscle was measured on CBCT at the level of the lingula on the side of the implant failure.

Results:
* The masseter muscle increased implant failure by an OR = 1.60 for every 100m3 increase in the muscle volume.
* Smoking: OR = 2.61
* Implant length (1mm decrease): OR = 1.45

Question 2

How does L-PRF affect socket preservation?- an RCT

Encalada Abad et al. IJOI

Answer 2

• Control group: Spontaneous socket healing
• Test group: L-PRF in socket
  Evaluated CBCT and STL scans immediately after extraction, and 4 months later.

Results:
* NSSD in almost all areas
*SSD in horizontal changes at 3mm apical to the CEJ: -4.6 in L-PRF group, vs. -2.9 in spontaneous healing group
* SSD in volumetric changes (65 mm3 in spontaneous group, 77 mm3 in L-PRF group)

Question 3

What is the significance of vertical platform discrepancies and splinting on marginal bone levels of adjacent implants?

Lin et al IJOI

Answer 3

Retrospective study.
Researchers aimed to see how splinting and vertical implant platform discrepancies (>0.5mm) affect marginal bone loss.

Included 2 or 3 adjacent implants with prostheses and 1+ year radiographs.

Results:
* Splinted restorations with vertical platform discrepancies had greater radiographic marginal bone loss (RMBL) than the splinted ones without discrepancies.

OR for bone loss = 2.55 compared to non-splinted restorations or a 3-unit bridge.

Conclusion: Splinting and vertical platform discrepancies increase periimplant bone loss.

Question 4

Marginal bone loss around platform-switched conical connection implants placed 1 or 2 mm subcrestally. A multicenter crossover RCT

Stacchi et al IJOI

Answer 4

Multicenter crossover RCT
Early marginal bone loss occurs due to remodeling. Success is when the remodeling is < 0.5mm.

Researchers aimed to see how platform-switch placed 1 vs. 2mm subcrestally affects this remodeling.

51 patients needing 2 implants each.
Measured by standardized PA’s

Results:
NSSD at 1 year.

Question 5

Compare the 1 year results of 2 vs. 4 implants for maxillary overdentures.

Onclin et al IJOI

Answer 5

RCT
Aims to compare MBL, survival, function, and Patient reported outcomes (PROM’s) over 1 year.

All were bar-attachment overdenture prostheses.

RESULTS:
* MBL = NSSD
* Survival: 94% in the 4 implant group, 77% in the 2 implant group.
* PROM’s: NSSD

Too short follow-up time

Question 6

Compare maxillary sinus elevation with coagulum, versus with bone graft.

Starch-Jensen et al IJOI

Answer 6

RCT
40 patients
* 20 with sinus elevation using Coagulum
* 20 with sinus elevation using bone graft

• The coagulum was blood aspirated from the surgical site and injected beneath the sinus membrane.
• Control group was bone graft using porcine xenograft.

Results:
* ISQ values: NSSD
* Survival: NSSD
* Peri-implant health: NSSD
* Peri-implant MBL: NSSD
* PROM’s : NSSD

Conclusion: No difference