Cementation Techniques for Single-tooth Implant Crowns

Kıvanç Akça

Status: Completed

Conditions: Cementation (MeSH Unique ID: D002484); Crown (MeSH Unique ID: D003442) Surfaces; Dental Implant-Abutment Design (MeSH Unique ID: D059605); Contour: Crown (MeSH Unique ID: D003442) - Dental Implant (MeSH Unique ID: D015921) Abutment

Treatments: Other: zinc polycarboxylate (with the requirements of ISO 9917)

Study type: Interventional

Funder types: Other

Identifiers

NCT03581565

THD-2018-16143 (Other Grant/Funding Number)

KA-17043

Details and patient eligibility

About

Cement retention has been widely used for implant-supported fixed partial dentures in daily dental practice. The cementation approach indeed offers straightforward clinical application protocol which is basically conceptualized for tooth/teeth supported fixed restorations. However, removal of excess cement around implant restorations presents specific difficulties. More importantly, there are certain biological consequences due to residual cement leftover in peri-implant sulcus. There is no evidence based guidance with regards to cementation techniques applied for implant supported fixed restorations due to limited clinical studies. Therefore the aim of this clinical trial is to compare three different cementation technique with regards to removal of excess cement and other clinical subsidiaries (abutment margin, crown surface and contour) involving indirectly as well.

Full description

Single-tooth implant crowns to replace missing molar tooth were addressed to qualify and quantify residual cement on implant-abutment complex and peri-implant soft tissue following cementation. Thirty bone-level dental implants of one kind enrolled in the study. Prior to delivery of screw-retained crowns completed for usual treatment, implants were allocated randomly to a trial comparison group. Three different cement loading approach, ten in each group, was applied using cement-retained trial crowns on prefabricated metal abutments. Following completion of the assigned cementation technique, the trial crown was removed with its abutment accessing from the occlusal hole prepared after removal of excess cement. Then, the presence of residual cement on implant-abutment complex and implant soft tissue in accordance with axial and proximal surfaces was qualified. To quantify the amount of residual cement in accordance with location and distribution, the crown-abutment complex was digitized three-dimensionally using an intra-oral scanner. The output of surface data was evaluated in virtual 3-D image for cement excess, when detected location in the abutment-crown complex is recorded, area and distribution was calculated using a software. The frequency of occurrence and quantity of residual cement of 3-different cementation techniques was statistically evaluated using logistic and linear regression model separately considering abutment margin, crown surface and contour.

Enrollment: 10 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• completed growth and development
• periodontally and dentally healthy conditions
• missing single molar tooth without free-end edentulism
• bone-level standard diameter of a specific implant from one manufacturer
• complication free healing period for osseointegration following straightforward surgical implant placement
• natural dentition or fixed restoration in dental arch
• signing of informed consent form

Exclusion criteria

• absolute systemic contraindications for implant surgery (e.g. bone cancer, radiation therapy)
• relative systemic contraindications for implant surgery (e.g. diabetes, steroid therapy)
• risk factors (e.g. smoking, limited mouth opening)

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Quadruple Blind

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10 participants in 3 patient groups

Technique I

Active Comparator group

Description:

Loading of a zinc polycarboxylate (with the requirements of ISO 9917) cement to fulfill the crown Cement: Poly-F, DentsplySirona, York, Pennsylvania, United States Mixing Ratio: 1 scoop powder: 2 drops liquid Mixing Time (extraoral): 30 seconds Working Time (extraoral): 45 seconds Application (extraoral): placement of mixture into crown using a heidemann Spatula Setting Time (intraoral): 2-8 minutes

Treatment:

Other: zinc polycarboxylate (with the requirements of ISO 9917)

Technique II

Active Comparator group

Description:

Loading of a zinc polycarboxylate (with the requirements of ISO 9917) to fill the coronal half of the crown Cement: Poly-F, DentsplySirona, York, Pennsylvania, United States Mixing Ratio: 1 scoop powder: 2 drops liquid Mixing Time (extraoral): 30 seconds Working Time (extraoral): 45 seconds Application (extraoral): placement of mixture into crown using a heidemann Spatula Setting Time (intraoral): 2-8 minutes

Treatment:

Other: zinc polycarboxylate (with the requirements of ISO 9917)

Technique III

Active Comparator group

Description:

Application of a zinc polycarboxylate (with the requirements of ISO 9917) to the axial walls of internal surface of crown Cement: Poly-F, DentsplySirona, York, Pennsylvania, United States Mixing Ratio: 1 scoop powder: 2 drops liquid Mixing Time (extraoral): 30 seconds Working Time (extraoral): 45 seconds Application (extraoral): application of mixture into crown using a bonding applicator tip Setting Time (intraoral): 2-8 minutes

Treatment:

Other: zinc polycarboxylate (with the requirements of ISO 9917)