Loma Linda, California 92354

  • Gum Recession


The aim of this prospective study is to assess the effects of definitive abutment connection at the time of implant placement on bone level changes in the areas of the posterior maxilla and mandible.

Study summary:

A total of 38 implants will be placed in 19 patients with at least 2 missing posterior teeth in the maxilla and the mandible for this study. Definitive prefabricated abutments will be connected at implant placement. The abutment (control group) on one of the two implants will be randomly selected to go through one complete cycle of complete disconnection and reconnection by hand at 16- (DR1), 19- (DR2), 22- (DR3), and 24- (DR4) weeks after implant surgery. The abutment (test group) on the other implant will be left undisturbed throughout the duration of the study. All implants will remain unrestored within the study period (12 months). Peri-implant bone level changes will be assessed using standardized periapical radiographs immediately after implant placement (T0), at 3-(T3), 6-(T6) and 12-(T12) month follow-up examinations and during each disconnection of the abutments.


Inclusion Criteria: - Minimum age 18 - Good oral hygiene - Healed site that possess two or more missing teeth in the maxillary or mandibular posterior region (excluding third molars) - Adequate bone to accommodate at least a 4.3 mm diameter and 8mm length implant at each site - Have at least 8mm interocclusal restorative space - Willing to participate and attend the planned follow-up visits. Exclusion Criteria: - History of alcohol/drug dependency, or any medical, physical, or psychological factor that might affect the surgical or prosthodontic procedures and follow-up examinations - History of radiation therapy to the head and neck region - History or current habit of smoking - History or current habit of bruxism - No opposing occluding dentition or prostheses - Need for bone augmentation during implant placement - Implant insertion torque value <35 Ncm



Primary Contact:

Principal Investigator
Joseph Kan, DDS, MS
Loma Linda University School of Dentistry

Yuen Lok Loretta Ching, DDS
Phone: 9093289742
Email: yching@llu.edu

Backup Contact:


Location Contact:

Loma Linda, California 92354
United States

Yuen Lok Loretta Ching, BDS
Phone: 909-328-9742
Email: yching@llu.edu

Site Status: Recruiting

Data Source: ClinicalTrials.gov

Date Processed: September 28, 2021

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