A Comparison Between Primary and Secondary Flap Coverage in Extraction Sites: A Pilot Study

Study design will be a single center, randomized controlled trial, split mouth designed study, to compare the bone dimensional changes following extraction and ridge preservation in surgical techniques that leave the flap open and closed.

The primary aim of this study is to evaluate the bone dimensional changes following extraction and ridge preservation with primary coverage (closed flap technique) in comparison to secondary intention (open flap technique).

The investigators hypothesize that the closed flap technique will have more potential to maintain vertical bone height when compared with the open flap technique, due to less susceptibility from infection and inflammation.

Secondary aim is to evaluate patients' self-report of postoperative discomfort. The investigators hypothesize that open flap technique will have less post-operative pain/discomfort due to less flap dissection and elevation when compared to closed flaps.

Tertiary aim is to have a histomorphometric examination and to assess the formation of new bone.

The investigators hypothesize that better bone volume percentage will be observed in closed flap technique when compared to open flap technique.

The primary outcome is the mean difference in alveolar bone height change between groups.

Inclusion criteria

• Patient who is treatment planned at Tufts University School of Dental Medicine (TUSDM) for extraction and future implant placement and meet all medical and dental requirements of the TUSDM periodontology clinic for periodontal surgery (e.g., subjects with no diseases or medication allergies contraindicating periodontal surgery).

• Patient must have bilateral extraction (canine to molar) sites of teeth located on the same arch (e.g. upper right and upper left) treatment planned for future implant placement at TUSDM.
• The number of teeth planned for extraction (either one or two adjacent) and ridge preservation should match the same number of teeth (either one or two adjacent) from the contra-lateral side on the same arch.
• Presence of at least 3 intact bony walls and at least half of the fourth bony wall at each site as determined by bone sounding at Visit 1.

Exclusion criteria

• Have any known disease that interferes with periodontal surgery and would not allow the patient to be treatment planned for the procedures in the TUSDM periodontology clinic (e.g., severe anemia, low white blood cell count, bleeding or coagulation disorder, uncontrolled hypertension (150/90), recent myocardial infarction (within 6 months of enrollment), diabetes (HbA1C ≥7%), HIV/AIDS (self-reported), history of or currently undergoing head and neck radiation, history of or currently taking bisphosphonates).

• Subject who has a disease or condition that may affect hard and soft tissue healing (e.g., previous or current head and neck radiation therapy, long term steroid use defined as more than two weeks in the past two years).
• Subject who has diseases that affect bone metabolism (e.g., osteoporosis, osteopenia).
• Pregnancy (self-reported)
• Current Smokers
• Extraction socket with > 50% bone loss on the buccal or lingual/palatal bone as determined by bone sounding at Visit 1.
• Allergic to gentamycin, povidone-iodine, or surfactants as trace amounts may be contained in the MinerOss®