---
title: Evaluation of Gingival Health Parameters in Hybrid CAD / CAM Crowns Produced After Different Retraction Processes
nct_id: NCT03816930
overall_status: COMPLETED
phase: NA
sponsor: Yuzuncu Yil University
study_type: INTERVENTIONAL
primary_condition: Periodontal Disease
countries: Turkey (Türkiye)
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT03816930.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT03816930"
ct_last_update_post_date: 2021-04-22
last_seen_at: "2026-05-12T07:17:30.013Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Evaluation of Gingival Health Parameters in Hybrid CAD / CAM Crowns Produced After Different Retraction Processes

**NCT ID:** [NCT03816930](https://clinicaltrials.gov/study/NCT03816930)

## Key Facts

- **Status:** COMPLETED
- **Phase:** NA
- **Study Type:** INTERVENTIONAL
- **Target Enrollment:** 52
- **Lead Sponsor:** Yuzuncu Yil University
- **Conditions:** Periodontal Disease, Gingival Disease
- **Start Date:** 2019-01-17
- **Completion Date:** 2020-04-17
- **CT.gov Last Update:** 2021-04-22

## Brief Summary

Clinically, the gingival retraction dentistry itself has found wide uses. It has achieved the use of subgingival and gingival crowns in fixed prostheses, cervical abrasion in restorative dentistry, management of root caries and root sensitivity, and recently in the use of appropriate measurements to improve the marginal fit of implant prostheses.There are three different retraction procedures described in the literature: mechanical, mechanical-chemical (chemically impregnated cords or matrix in injectable form) and surgery (electrosurgical, laser, cauterization, etc.)The mechanical method of retraction cords is not always suitable for patients' existing pocket depth, the necessity of using different combinations in shallow or deep pockets, the potential for limited bleeding control in chemically impregnated cords and the toxicity values in those who interact with chemical have led researchers to search for alternative methods. Especially inflammed gingiva is very sensitive to mechanical and chemical trauma. Studies have reported that gingival inflammation, pain, pocket formation, gingival withdrawal, increased bleeding and wound contamination occurred following retraction cord application. However, it is a known fact that the impression material is distorted or the accuracy of the measurement is decreased with the measurements taken without retraction. Nowadays, CAD / CAM (computer-aided design / computer-aided manufacturing) devices, which are designed to overcome these problems and eliminate the errors related to the measurement material, are the first step to be taken with a clear measure.Gingival retraction is recommended to improve the success of scanners in all restorations performed at the gingival or subgingival endpoint. Therefore, in our study, crown restorations will be produced from hybrid blocks by means of CAD / CAM device in order to evaluate the interaction of gingival health with hybrid blocks and to provide the latest technology and standardization.

## Eligibility

- **Minimum age:** 18 Years
- **Maximum age:** 60 Years
- **Sex:** ALL
- **Healthy Volunteers:** Yes

```
Inclusion Criteria:

* Being systemically healthy
* To indicate crown restoration in mandibular molar teeth
* To be vital to the preparation of the crown of the teeth

Exclusion Criteria:

* Systemically unhealthy individuals
* Endodontic treatment of mandibular molar teeth
* Mandibular molar female individuals drawn for various reasons
* Pregnant women
* Periodontally unhealthy individuals
```

## Arms

- **Mechanical cord usage** (ACTIVE_COMPARATOR) — Mechanical retraction
- **Chemical contained retraction usage** (ACTIVE_COMPARATOR) — Chemical retraction
- **MZ-6 laser tip used throughing** (ACTIVE_COMPARATOR) — Laser retraction

## Interventions

- **mechanical cord usage** (PROCEDURE) — Due to the retraction procedures, same preparation conditions will be obtained.

## Primary Outcomes

- **Retraction methods or procedures effects on gingival health** _(time frame: 3-12 months)_ — Probing depth is one of the criteria that shows the gingival health. In each control sessions same researcher measure the probing depth as mm via a periodontal probe.

## Locations (1)

- Beyza Ünalan Değirmenci, Van, Turkey (Türkiye)

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.phases` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.beyza ünalan değirmenci|van||turkey (türkiye)` — added _(2026-05-12)_

---

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*Source data (authoritative): https://clinicaltrials.gov/study/NCT03816930*  
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