It may be concluded that in cases with low quality and quantity of bone, the increase in number of implants and the use of a splinted attachment should be preferred to reduce forces emerging around the implants during function. The use of 2 single attachments in cases with good bone quality and ideal size implants still seems to be a safe and sufficient solution for the treatment of mandibular edentulism with OVDs.
Objectives
In mandibular edentulism, the treatment option with a two-interforaminal implant-retained bridge and a removable partial denture is rarely evaluated in literature. The aim of this
in vitro
study was to evaluate the stress distribution of this treatment option by comparing it with traditional treatment options with interforaminal implants in the edentulous mandible.
Materials and Methods
Two interforaminal implants were placed in a formalin-fixed cadaver mandible, and overdentures with three different types of attachments were fabricated: (1) two ball attachments and an overdenture, (2) a Dolder bar and an overdenture, and (3) screw-retained two-implant inter-canine porcelain fused to a metal bridge and an implant-assisted removable denture (IARD) with precision attachments. Three biting conditions were generated for each denture type, and the strains were documented under vertical loading of 100 N.
Results
The calculated strain values from measured strains in all measurement sites and loading conditions for the screw-retained two-implant inter-canine porcelain fused to a metal bridge and a cast framework partial denture with precision attachments situation were lower than in the other scenarios (
P
<0.05).
Conclusion
Within the limitations of the present study, it can be concluded that an IARD may be a reasonable and valuable alternative to ball attachments or a bar in two interforaminal implants, especially when the patients prefer to be able to show their teeth even when they take out their removable dentures.
Purpose:The objective of this in vitro study was to investigate and compare the precisions of
several radiodiagnostic methods used in dentistry for the measurement of peri-implantary sites.Materials and Methods:Six dental implants were placed in a human cadaver mandible. Periapical radiographs obtained with the parallel as well as
the bisecting angle technique, digital and conventional panoramic radiographs were used
for implant and peri-implant bone measurements. The measurement results at each implant were statistically analyzed.Results:The ICC values for the inter-observer reliability were 0.79 for implant diameters and 0.96 for implant lengths.
Statistical significance was not detected between the differences of the measurements of the 2 examiners from the original implant dimensions related to
anatomic locations. For both of the examiner measurements, significantly less difference from the original implant dimensions was detected in the parallel
technique compared to the other techniques (p<0.05).Conclusion:The present study showed that the most precise peri-implant bone measurements can be
obtained from periapical radiographies by using the parallel technique.
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