MINIMALLY INVASIVE SURGERY / PERIODONTAL MICROSURGERY / MICROSURGERY IN PERIODONTICS

1. INTRODUCTION AND DEFINITION

• "Microsurgery is defined as a refinement in surgical technique by which visual acuity is increased using a microscope at magnifications exceeding 10X. Although loupes improve normal vision, they do not increase visual acuity to the degree required for true microsurgery. Microsurgery is also an ergonomic methodology in which surgical manipulations are improved through better motor coordination." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70 - Dennis A. Shanelec and Leonard S. Tibbetts)
• "Microsurgery can be defined as refinement in operative technique by which visual acuity is enhanced through the use of the surgical operative microscopes. In microsurgery due to excellent visualization of the surgical field, the surgeon's dexterity is enhanced leading to less tissue injury and superior tissue handling." (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• "Microsurgery is surgery performed under a magnification of x10 or more, which is possible only by using a surgical microscope. The hallmarks of microsurgery are increased visual acuity and improved manual dexterity. When visibility is increased 10-fold, motor movement precision is increased 1 mm to 10 μm. This is the approximate size of an epithelial cell. Large incisions for visibility are therefore unnecessary." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

2. HISTORICAL BACKGROUND

• "First reports on microsurgery go back to the 19th century when a microscope for use in ophthalmology was developed (Tamai 1993). Later, to correct otosclerotic deafness, the first surgical operation with a microscope was performed in Sweden (Nylén 1924). The microsurgical technique, however, did not attract the interest of surgeons until the 1950s, when the first surgical microscope, OPMI 1, with a co-axial lighting system and the option for a stereoscopic view was invented and commercialized by the Carl Zeiss company." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47 - Lindhe and Lang)
• "The microvessel surgery that later revolutionized plastic and transplantation surgery was mainly developed by neurosurgeons (Jacobsen & Suarez 1960; Donaghy & Yasargil 1967). With microsurgically-modified techniques, small vessels of a diameter of <1 mm could be successfully anastomosed on a routine basis. As a consequence, a completely amputated thumb could be successfully replanted for the first time in 1965." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)
• Positive results for microsurgically modified interventions led to today's routine clinical applications in orthopedics, gynecology, urology, plastic reconstructive, and pediatric surgery. (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)

3. PHILOSOPHY OF PERIODONTAL MICROSURGERY

• "The philosophy of microsurgery embraces three core values."
  1. "The first is enhanced motor skills for better surgical performance. This is accomplished through improved visual acuity and the use of a precise hand grip to increase accuracy and reduce tremor."
  2. "The second is minimal tissue trauma, which is accomplished through smaller incisions and reduced surgical fields."
  3. "The third value is primary passive wound closure. This is accomplished by microsuturing to eliminate gaps and dead spaces at the wound edge." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Small surgical instruments are used to advantage in the reduced surgical field. This minimally invasive philosophy results in less injury, diminished morbidity, and rapid healing." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Sharp microsurgical blades are used to create incisions at a virtually cellular level. These incisions are closed with meticulous apposition to eliminate wound edge gaps and dislocations, allowing healing by primary intention to begin within hours of microsurgical closure. This circumvents the need for an extensive secondary mitotic stage of wound healing to bridge wound gaps and fill surgical voids." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

4. MAGNIFICATION SYSTEMS

A. Magnifying Loupes

• "Dental loupes are the most common system of optical magnification used in periodontics. Loupes are fundamentally dual monocular telescopes with side-by-side lenses that converge to focus on the operative field. The magnified image formed has stereoscopic properties by virtue of their convergence. A convergent lens optical system is called a Keplerian optical system." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "The clinician's eyes must converge to view the operative field. This can result in eye strain, fatigue, and pathologic vision changes, especially after prolonged use." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

• "Prism telescopic loupes are the most optically advanced type of loupes. They consist of prisms which are used to refract light rays. This system provides better magnification and wider depth of field. The range of magnification of these loupes is around 1.5x - 6x. Generally the dentists use magnification loupes of range 2.5x - 3.5x; however, periodontists prefer magnification of 3.5x - 4.5x." (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• "For some periodontal procedures, prism telescopic loupes with magnification of x4 provide an adequate combination of magnification, field of view, and depth of focus. However, the surgical microscope offers much higher magnification and superior optics compared with any of the loupe optical systems mentioned." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

B. Surgical Operating Microscope (OPM)

• "The surgical microscope offers greater versatility than dental loupes by providing a range of magnification with superior optical performance. Surgical microscopes designed for dentistry use galilean optics, which have binocular eyepieces joined by offset prisms to establish a parallel optical axis and permit stereoscopic vision without eye convergence or eyestrain." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Surgical microscopes have coated achromatic lenses, high optical resolution, and a rotating magnification element that allows the microsurgeon to change magnification easily to a value appropriate for the surgical task at hand. Because the optical elements of surgical microscopes are more advanced than those in loupes, depth of focus and field of view characteristics are greatly enhanced. Surgical microscopes have objective lenses with various working distances. A useful range in dentistry is 250 to 350 mm." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Advantages of OPM include enhanced illumination, magnification and increased precision in the surgical skills. It basically consists of: Magnification changer; Objective lenses; A lighting unit, binocular tubes and eyepieces." (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• Coaxial Illumination: "Fiberoptic coaxial illumination is a major advantage because it focuses light parallel to the microscope's optical axis, which eliminates shadows. Surgeons can visualize the deepest reaches of the oral cavity, including subgingival pockets and angular bony defects. Definitive visualization of root surface to detect deposits and irregularities is possible." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• Documentation: "The surgical operating microscope is an ideal platform for documenting periodontal pathology and clinical procedures. Digital images can be captured using a beam splitter and camera attachment. A foot-controlled switch permits a surgeon to record as the procedure unfolds without interrupting surgery." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

5. MICROSURGICAL INSTRUMENTS

• "In addition to the use of magnification and reliance on atraumatic technique, microsurgery requires specially constructed instruments designed specifically to minimize trauma. An important characteristic of microsurgical instruments is their ability to create clean incisions that prepare wounds for healing by primary intention." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68; also Carranza's Clinical Periodontology, 10th Edition, Chapter 70)
• "Microsurgical incisions are established at a 90-degree angle to the surface using ophthalmic microsurgical scalpels (Castroviejo microsurgical scalpel)." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70)
• The armamentarium used in microsurgery includes: Knives, Retractors, Micro scissors, Needle holders, Microforceps, Microscalpels. (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• Ergonomics of instruments: "Microsurgical instruments are circular in cross section to permit precise rotational movements. They are manufactured of titanium because of its strength, lightness, and nonmagnetic characteristics. The various postural and ergonomic methods of reducing unwanted hand movements result in more precise surgeries. These methods also greatly reduce surgical fatigue." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70)
• "Titanium instruments are used for strength and lightness and are made with round handles to permit precise rotation. This reduces hand fatigue and tremor for precise surgical movement." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Rounded, titanium microsurgical instruments, ideally 9 mm in diameter, reduce muscle fatigue and facilitate precise, rotational hand movements." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Fig. 68.12)

6. MICROSURGICAL SUTURES

• "To achieve ideal microsurgical wound closure, a surgeon depends on how the incisions were planned and executed, how the surgery was performed, and the suturing technique. Selection of proper suture needles and materials is essential for successful microsurgical wound closure. The choice of suture and needle size is critical for atraumatic tissue passage." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Sutures are classified according to structure as monofilament or braided, according to surface as coated or uncoated, and according to biologic properties as absorbable or nonabsorbable. The suture of choice in microsurgery is a monofilament suture material such as polypropylene or polydioxanone. These materials are bacteriostatic and noninflammatory, hold a knot extremely well, and are easily removed." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "In periodontal microsurgery, the suture size ranges from 6-0 (i.e., diameter of a human hair) to 9-0. The size and shape of the needle used is essential for the atraumatic passage of the suture. The needle diameter is ideally slightly larger than the suture size. Sutures used in microsurgery are swaged, making the needle and the suture continuous." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "For primary wound closure, microsutures in the range of 6-0 to 9-0 are needed to accurately approximate the wound edges. Microsurgical wound apposition minimizes gaps or voids at the wound edges. This encourages rapid healing with less postoperative inflammation and with less pain." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70)
• "The gauge of sutures used in microsurgery range from 7-0 to 10-0 and are mostly made up of polypropylene compounds." (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• Needle characteristics: "In order to minimize tissue trauma in periodontal microsurgery, the sharpest needles, namely reverse cutting needles with precision tips or spatula needles with micro tips, are preferred. For periodontal microsurgery, the 3/8" circular needle generally ensures optimum results. For papillary sutures in the posterior area, needle lengths of 13-15 mm are appropriate. The same task in the front aspect requires needle lengths of 10-12 mm, and for closing a buccal releasing incision, needle lengths of 5-8 mm are adequate." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)

7. ROLE OF MICROSURGERY IN ROOT PREPARATION

• "Microsurgery offers another advantage in the area of root preparation. The importance of root débridement is recognized universally as an essential component of periodontal therapy. Research in clinical dentistry has shown that microscope-enhanced vision more readily accomplishes the established clinical goals of endodontic and restorative dentistry. In periodontics, studies have demonstrated that root débridement performed without magnification was incomplete. When débrided roots were examined with the aid of a microscope, substantial deposits remained." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "The primary goals of periodontal surgery include visual access to the root surface for plaque and calculus removal and for removing pathologically altered tooth structures. Magnification greatly improves the surgeon's ability to create a clean, smooth root surface. Magnification permits preparation of hard and soft tissue wound surfaces so that they can be joined together according to the accepted microsurgical principle of butt joint wound approximation. This encourages primary wound healing and enhanced periodontal reconstruction. Studies of wound healing show epithelial anastomosis of microsurgically joined surgical wounds in animals within 48 hours." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

8. MINIMALLY INVASIVE SURGERY (MIS) IN PERIODONTAL REGENERATION

• "Concepts of using conservative and minimally invasive flap approaches have been introduced as minimally invasive surgery (MIS). By using these surgical principles, several modifications have developed and evolved into the MIS technique (MIST), the modified MIST (M-MIST), and the single-flap approach (SFA). The flap design for these techniques minimizes the number of incisions and, as a result, the surgical trauma, especially when the operation is performed with the use of magnification and microsurgical techniques." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter relating to regenerative surgery)
• "Several minimally invasive approaches have shown statistical improvements when used in conjunction with EMD, although no difference has been demonstrated when used with rhPDGF. Of special interest is that the recession values for these conservative or minimally invasive procedures tend to be lower than those reported with other access flap surgery techniques. GTR studies suggest that the MIS approach may be better suited for regeneration in the esthetic zone." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition)

9. CLINICAL APPLICATIONS OF PERIODONTAL MICROSURGERY

• "In periodontal plastic surgery: Free gingival and connective tissue grafts; Papilla reconstruction procedures; Coronally advanced flaps. In regenerative and resective procedures. Ridge preservation and augmentation procedures." (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• "Advanced periodontics has an increasing need for clinical procedures that require intricate surgical skills. Regenerative procedures, periodontal plastic surgery, and dental implants are a few of the surgical procedures that demand clinical performance that frequently challenge the skills of periodontal surgeons beyond the range of possibility with ordinary vision." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Microsurgery establishes a minimally invasive surgical approach to periodontics exemplified by fewer vertical incisions and smaller surgical sites. Every field of microsurgery has recognized the extent to which reduced incision size and less retraction directly correlate with reduced postoperative morbidity and rapid healing." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Periodontal microsurgery raises the treatment bar in many ways. Surgical decision-making is enhanced because the quality and quantity of visual data reaching the cerebral cortex are increased by a square of the magnification level. Ergonomic and body posture advantages also occur when using the surgical microscope. Issues such as neuromuscular fatigue and occupational skeletal pathology are reduced." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

10. ERGONOMICS AND TRAINING

• "Sitting comfort, good body posture, arm support, and controlled breathing are inherent to proper microscope use. Motor skills are enhanced through instruments designed for a precision grip of the hand." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Proprioceptive guidance is of little value at the microsurgical level. Visual guidance is used for midcourse correction of scalpels and instruments to achieve the finest degrees of skill and dexterity. Incisions can be accurately mapped, flaps elevated with minimal damage, and wounds closed accurately without tension." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• Training protocol (Lindhe 6th Ed): "At the start of training, a two-dimensional model, such as a rubber dam, is appropriate for learning how to manipulate the instruments, pick up the needles, and tie knots. After the initial training, practicing on three-dimensional models (fruit, eggs, chickens) helps the surgeon become accustomed to the restricted depth of the field." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)
• Tremor control: "An important factor is body posture, which must be natural, with the spinal column straight and the forearms and hands fully supported. An adjustable chair, preferably on wheels, is recommended for the surgeon. Tremor varies between individuals and even in the same individual under different conditions. In some people, the intake of coffee, tea or alcohol may increase tremor; in others, emotions, physical exercises or the carrying of heavy weights can cause it." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)

11. ADVANTAGES OF PERIODONTAL MICROSURGERY

• Reduced tissue trauma
• Minimal discomfort
• Improved esthetics
• Minimally invasive
• Decreased operator fatigue (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• "Its benefits include improved cosmetics, rapid healing, minimal discomfort, and enhanced patient acceptance." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70)
• "With training, the average periodontal microsurgeon can consistently produce better crafted work than the most talented surgeon using conventional methods." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

12. DISADVANTAGES OF PERIODONTAL MICROSURGERY

• More demanding and technique-sensitive
• High cost
• Restricted area of vision; loss of depth of field as magnification increases
• A steep learning curve
• Controlling physiologic tremors for finer movements (Essentials of Clinical Periodontology and Periodontics, Chapter 54)

13. CONCLUSIONS

• "As medicine and dentistry continue the pursuit of minimally invasive treatment, periodontal microsurgery and its principles will emerge as the methodology to meet professional and public demand. The microscope provides a tremendous platform from which the microsurgical clinician can gather and observe detailed and precise amounts of information." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Periodontal microsurgery is a natural progression from conventional surgical principles to a surgical ethic in which the surgical microscope is used for the most accurate and atraumatic handling of tissue." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Periodontics of the future will see increasing use of magnification in all areas of practice, including implantology." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70)

1. Shanelec DA, Tibbetts LS. Chapter 70: Recent Advances in Surgical Technology (Microsurgery). Carranza's Clinical Periodontology, 10th Edition. Elsevier, 2006.
2. Chapter 68: Periodontal Microsurgery. Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition. Elsevier, 2023.
3. Burkhardt R, Lang N. Chapter 47: Periodontal Plastic Microsurgery (Concepts in Microsurgery). Clinical Periodontology and Implant Dentistry, 6th Edition. Lindhe and Lang, eds. Wiley-Blackwell, 2015.
4. Chapter 54: Periodontal Microsurgery. Essentials of Clinical Periodontology and Periodontics (S. Reddy).

MINIMALLY INVASIVE SURGERY / PERIODONTAL MICROSURGERY / MICROSURGERY IN PERIODONTICS

1. INTRODUCTION AND DEFINITION

• "Microsurgery is defined as a refinement in surgical technique by which visual acuity is increased using a microscope at magnifications exceeding 10X. Although loupes improve normal vision, they do not increase visual acuity to the degree required for true microsurgery. Microsurgery is also an ergonomic methodology in which surgical manipulations are improved through better motor coordination." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70 - Shanelec & Tibbetts)
• "The hallmarks of microsurgery are increased visual acuity and improved manual dexterity. When visibility is increased 10-fold, motor movement precision is increased 1 mm to 10 μm. This is the approximate size of an epithelial cell. Large incisions for visibility are therefore unnecessary." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

2. HISTORICAL BACKGROUND

• "First reports on microsurgery go back to the 19th century when a microscope for use in ophthalmology was developed (Tamai 1993). Later, to correct otosclerotic deafness, the first surgical operation with a microscope was performed in Sweden (Nylén 1924). The microsurgical technique did not attract the interest of surgeons until the 1950s, when the first surgical microscope, OPMI 1, with a co-axial lighting system and the option for a stereoscopic view was invented and commercialized by the Carl Zeiss company." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47 - Lindhe and Lang)
• "The microvessel surgery that later revolutionized plastic and transplantation surgery was mainly developed by neurosurgeons (Jacobsen & Suarez 1960; Donaghy & Yasargil 1967). With microsurgically-modified techniques, small vessels of a diameter of <1 mm could be successfully anastomosed on a routine basis." Positive results led to today's routine clinical applications in orthopedics, gynecology, urology, plastic reconstructive, and pediatric surgery. (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)

3. PHILOSOPHY OF PERIODONTAL MICROSURGERY

1. "Enhanced motor skills for better surgical performance - accomplished through improved visual acuity and the use of a precise hand grip to increase accuracy and reduce tremor."
2. "Minimal tissue trauma - accomplished through smaller incisions and reduced surgical fields."
3. "Primary passive wound closure - accomplished by microsuturing to eliminate gaps and dead spaces at the wound edge." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

• "Sharp microsurgical blades are used to create incisions at a virtually cellular level. These incisions are closed with meticulous apposition to eliminate wound edge gaps and dislocations, allowing healing by primary intention to begin within hours of microsurgical closure. This circumvents the need for an extensive secondary mitotic stage of wound healing to bridge wound gaps and fill surgical voids." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

4. MAGNIFICATION SYSTEMS

A. Magnifying Loupes

B. Surgical Operating Microscope (OPM)

• "The surgical microscope offers greater versatility than dental loupes by providing a range of magnification with superior optical performance. Surgical microscopes designed for dentistry use galilean optics, which have binocular eyepieces joined by offset prisms to establish a parallel optical axis and permit stereoscopic vision without eye convergence or eyestrain. Surgical microscopes have coated achromatic lenses, high optical resolution, and a rotating magnification element. A useful working distance range in dentistry is 250 to 350 mm." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• Coaxial Illumination: "Fiberoptic coaxial illumination is a major advantage because it focuses light parallel to the microscope's optical axis, which eliminates shadows. Surgeons can visualize the deepest reaches of the oral cavity, including subgingival pockets and angular bony defects. Definitive visualization of root surface to detect deposits and irregularities is possible." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• Documentation: "Digital images can be captured using a beam splitter and camera attachment. A foot-controlled switch permits a surgeon to record as the procedure unfolds without interrupting surgery." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• The components of OPM include: Magnification changer, Objective lenses, A lighting unit, binocular tubes and eyepieces. (Essentials of Clinical Periodontology and Periodontics, Chapter 54)

5. MICROSURGICAL INSTRUMENTS

• "Microsurgery requires specially constructed instruments designed specifically to minimize trauma. An important characteristic of microsurgical instruments is their ability to create clean incisions that prepare wounds for healing by primary intention. Microsurgical incisions are established at a 90-degree angle to the surface using ophthalmic microsurgical scalpels (Castroviejo microsurgical scalpel)." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70)
• The armamentarium includes: Knives, Retractors, Micro scissors, Needle holders, Microforceps, Microscalpels. (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• "Microsurgical instruments are circular in cross section to permit precise rotational movements. They are manufactured of titanium because of its strength, lightness, and nonmagnetic characteristics. Rounded, titanium microsurgical instruments, ideally 9 mm in diameter, reduce muscle fatigue and facilitate precise, rotational hand movements." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68; Carranza's 10th Edition, Chapter 70)

6. MICROSURGICAL SUTURES

• "The suture of choice in microsurgery is a monofilament suture material such as polypropylene or polydioxanone. These materials are bacteriostatic and noninflammatory, hold a knot extremely well, and are easily removed. The smallest suture capable of supporting the wound produces the least tissue trauma and the least interruption of the blood supply." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "In periodontal microsurgery, the suture size ranges from 6-0 (i.e., diameter of a human hair) to 9-0. Sutures used in microsurgery are swaged, making the needle and the suture continuous. Cutting needles pass through gingival tissue easily but can tear tissue. Tapered needles are less traumatic and less likely to tear tissue." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "For periodontal microsurgery, reverse cutting needles with precision tips or spatula needles with micro tips are preferred. The 3/8" circular needle generally ensures optimum results. For papillary sutures in the posterior area, needle lengths of 13-15 mm are appropriate; in the anterior, 10-12 mm; for closing a buccal releasing incision, 5-8 mm." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)

7. MINIMALLY INVASIVE SURGERY (MIS) IN PERIODONTAL REGENERATION

• "Concepts of using conservative and minimally invasive flap approaches have been introduced as minimally invasive surgery (MIS). By using these surgical principles, several modifications have developed and evolved into the MIS technique (MIST), the modified MIST (M-MIST), and the single-flap approach (SFA). The flap design for these techniques minimizes the number of incisions and, as a result, the surgical trauma, especially when the operation is performed with the use of magnification and microsurgical techniques." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition)
• "Several minimally invasive approaches have shown statistical improvements when used in conjunction with EMD. Of special interest is that the recession values for these conservative or minimally invasive procedures tend to be lower than those reported with other access flap surgery techniques. GTR studies suggest that the MIS approach may be better suited for regeneration in the esthetic zone." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition)

8. CLINICAL APPLICATIONS

• In periodontal plastic surgery: Free gingival and connective tissue grafts; Papilla reconstruction procedures; Coronally advanced flaps.
• In regenerative and resective procedures.
• Ridge preservation and augmentation procedures. (Essentials of Clinical Periodontology and Periodontics, Chapter 54)
• "Root débridement performed without magnification was incomplete. When débrided roots were examined with the aid of a microscope, substantial deposits remained. Magnification permits preparation of hard and soft tissue wound surfaces so that they can be joined together according to the accepted microsurgical principle of butt joint wound approximation. This encourages primary wound healing. Studies show epithelial anastomosis of microsurgically joined surgical wounds in animals within 48 hours." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)

9. ERGONOMICS AND TRAINING

• "Proprioceptive guidance is of little value at the microsurgical level. Visual guidance is used for midcourse correction of scalpels and instruments. Incisions can be accurately mapped, flaps elevated with minimal damage, and wounds closed accurately without tension." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "At the start of training, a two-dimensional model, such as a rubber dam, is appropriate for learning how to manipulate the instruments, pick up the needles, and tie knots. After the initial training, practicing on three-dimensional models (fruit, eggs, chickens) helps the surgeon become accustomed to the restricted depth of the field." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)
• "An important factor is body posture, which must be natural, with the spinal column straight and the forearms and hands fully supported. Tremor varies between individuals and even in the same individual under different conditions. In some people, the intake of coffee, tea or alcohol may increase tremor." (Clinical Periodontology and Implant Dentistry, 6th Edition, Chapter 47)

10. ADVANTAGES AND DISADVANTAGES

• Reduced tissue trauma
• Minimal discomfort
• Improved esthetics
• Minimally invasive with decreased operator fatigue
• "With training, the average periodontal microsurgeon can consistently produce better crafted work than the most talented surgeon using conventional methods." (Essentials of Clinical Periodontology and Periodontics, Chapter 54; Newman and Carranza's, 14th Edition, Chapter 68)

• More demanding and technique-sensitive
• High cost
• Restricted area of vision; loss of depth of field as magnification increases
• A steep learning curve
• Difficulty controlling physiologic tremors for finer movements (Essentials of Clinical Periodontology and Periodontics, Chapter 54)

11. CONCLUSION

• "As medicine and dentistry continue the pursuit of minimally invasive treatment, periodontal microsurgery and its principles will emerge as the methodology to meet professional and public demand." (Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition, Chapter 68)
• "Microsurgery offers new opportunities for periodontal surgery that can enhance the therapeutic results for a variety of procedures. Its benefits include improved cosmetics, rapid healing, minimal discomfort, and enhanced patient acceptance. Periodontics of the future will see increasing use of magnification in all areas of practice, including implantology." (Carranza's Clinical Periodontology, 10th Edition, Chapter 70)

1. Shanelec DA, Tibbetts LS. Chapter 70. Carranza's Clinical Periodontology, 10th Edition. Elsevier, 2006.
2. Chapter 68. Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition. Elsevier, 2023.
3. Burkhardt R, Lang N. Chapter 47. Clinical Periodontology and Implant Dentistry, 6th Edition. Lindhe & Lang, eds. Wiley-Blackwell, 2015.
4. Chapter 54. Essentials of Clinical Periodontology and Periodontics. S. Reddy.