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Clinical Assessment Of Inlay Retained Bridge Designs (Tub Shaped And Inlay Shaped) In Missing Posterior Teeth Cases.

NCT03715842 · Status: UNKNOWN · Phase: NA · Type: INTERVENTIONAL · Enrollment: 7

Last updated 2018-10-23

No results posted yet for this study

Summary

The interest in partial coverage retainers such as inlays and onlays have increased drastically because these restorations are able to provide a more conservative option requiring minimal tissue removal thus preserving healthy tooth structure to a maximum extent.

If patient rejects an implant treatment and enough sound tooth structure is available it would be desirable to restore a missing tooth with Inlay-Retained Fixed Partial Denture instead of full coverage retained one .

The use of all-ceramic materials for inlays and onlays in restorative dentistry is becoming more popular , the proper selection of restorative materials, careful preparation design and adequate adhesion between tooth/restorative material interfaces considered important factor to prevent failures .

Zirconia was introduced into dentistry in the 1990s.The high initial strength and fracture toughness of zirconia results from a physical property of partially stabilized zirconia known as transformation toughening. On the other hand, its white color, similar to the color of natural teeth and its ability to transmit light makes it useful in aesthetically important areas .

Inlay Fixed Partial Denture restoration may have increased the risk of fracture due to the relative small size of restorations compared to the complete coverage restoration. An unfavorable distribution of stresses between the ceramic inlay and tooth structure may result in marginal deterioration around the inlay or its failure.

The direction of forces on the occlusal surface of Inlay Fixed Partial Denture may lead to the phenomenon of submargination, ceramic fracture, wear at interface and postoperative hypersensitivity which remain a problem that require further investigation. One of the most important factors in the success and longevity of a restoration is to have an accurate marginal fit. Ideally, the cemented restoration should precisely meet the finish line of the prepared tooth. In reality, clinical perfection is challenging to achieve and to verify.

Conditions

  • Missing Tooth

Interventions

OTHER

Tub shaped design

The tub-shaped inlay preparation design this consists of an occlusal proximal reduction featuring a 3.5-4 mm width bucco-lingually, 3-3.5mm depth occluso-gingivally and 7-7.5 mm length mesio distally for molars and 2.3-2.8mm width buccolingually, 3-3.5 mm depth occluso gingivally and 3.5-4mm length mesiodistally for premolars. when necessary, superficial extensions may also be made on the preparations so that the occlusal fossa included in the preparation area and then the susceptibility for plaque accumulation will be diminished.

OTHER

Inlay shaped design

The occlusal inlay had a preparation depth that allowed a thickness of 2.0 mm for the ceramic. The occlusal preparation was 4 mm wide and extended 4 or 6 mm mesio-distally for the premolar or molar models, respectively. The proximal box was 1 mm wide and had approximately 5˚ divergence, extending 2 mm apical to the isthmus floor . The preparations corresponded to a proximal connector area of 3 mm × 3 mm for molars and premolars.

Sponsors & Collaborators

  • Cairo University

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
55 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2019-03-11
Primary Completion
2020-03-11
Completion
2020-04-11

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03715842 on ClinicalTrials.gov