The Influence of the Crown-implant Ratio on the Crestal Bone Level and Implant Secondary Stability

The Influence of the Crown-implant Ratio on the Crestal Bone Level and Implant Secondary Stability - 36 Months Clinical Study

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03471000

Enrollment

Registered

2018-03-20

Start date

2012-01-01

Completion date

2016-01-01

Last updated

2020-01-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Partial Edentulism, Tooth Loss

Keywords

implant, dental implant

Brief summary

The aim of the study was to determine whether implant length and the crown-to-implant (C/I) ratio influence implant stability and the loss of the surrounding marginal bone, and whether short implants can be used instead of sinus augmentation procedures.

Detailed description

The patients participating in the study (n=30) had one single tooth implant - a short (OsseoSpeed™ L6Ø4 mm, Implants) or a regular implant (OsseoSpeed™ L11 and L13Ø4 mm, DENTSPLY Implants) - placed in the maxilla. The evaluation was based on clinical and radiological examination. The crown-to-implant ratio was determined by dividing the length of the crown together with the abutment by the length of the implant placed crestally. Mean crown-to-implant ratios were calculated separately for each group and its correlation with the MBL (marginal bone loss) and stability was assessed. The authors compared the correlation between the C/I ratio values, MBL and secondary implant stability.

Interventions

OTHERShort implants Treatment

Short implants are placed in the alveolar bone and a clinical Ostell and Periotest evaluation of the implants after a period of time is done. Analysis of periapical radiographs and CBCT images after a period of time. Bone around the implant was measured, marginal bone level loss is determined.

OTHERRegular implants Treatment

Sinus lift procedure is done and regular implants are placed in the alveolar bone and a clinical Ostell and Periotest evaluation of the implants after a period of time is done. Analysis of periapical radiographs and CBCT images after a period of time. Bone around the implant was measured, marginal bone level loss is determined.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

SINGLE (Subject)

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Yes

Inclusion criteria

* Non-smoking patients with no systemic or local diseases were qualified. Additional inclusion criteria were as follows: * minimal apicocoronal height of the alveolar ridge of 6 mm in the region of the implant insertion in the pre-surgical qualification * minimal width of the alveolar ridge of 6-7 mm in the region of interest * HKT (height of the keratinized tissue) higher than 2 mm * API ≤ 35 (Approximal Plaque Index) * PI ≤ 25. (Plaque Index) * Bone Type III or D2 were included in the study * No graft procedures in the area of interest,

Exclusion criteria

Design outcomes

Primary

Measure	Time frame	Description
Clinical measurement of implant stability	36 months	Evaluation of implant secondary stability in both groups. Stability measured and evaluated with Periotest(R) device - after 36 months.

Secondary

Measure	Time frame	Description
Radiological measurement of marginal bone loss around implant	36 months	Evalation if there is difference in marginal bone level around the implants in both groups. Periapical radiographs and CBCT images taken and the begining and at the end of the observation period will be compared and bone level will be measured. Loss of marginal bone will be calculated.

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 25, 2026