the scalpel finishing technique: a tooth-friendly way to

18
CLINICAL RESEARCH 228 THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY Correspondence to: Elaine Kup, DDS, MSc Alameda Dos Aicas 927/ap 142, Indianapolis SP, Sao Paulo, 04086002, Brazil; E-mail: [email protected] The scalpel finishing technique: a tooth-friendly way to finish dental composites in anterior teeth Elaine Kup, DDS, MSc Associate Assistant, Department of Restorative Dentistry and Endodontics, Faculty of Dental Surgery, Paris Diderot University, Paris, France Member of the Biomimetic Pole of the Dentistry Service, Charles Foix Hospital, Ivry-sur-Seine, France Private Practice, Sao Paulo, Brazil Gil Tirlet, DDS, PhD Senior Lecturer, Department of Prosthetic Dentistry, Faculty of Dental Surgery, Paris Descartes University, Sorbonne Paris Cité, Montrouge, France Department of Restorative and Prosthetic Dentistry, APHP Head of the Biomimetic Pole of the Dentistry Service, Charles Foix Hospital, Ivry-sur-Seine, France Private Practice, Paris Jean-Pierre Attal, DDS, PhD Senior Lecturer, Department of Biomaterials (URB2i, EA4462), Faculty of Dental Surgery, Paris Descartes University, Sorbonne Paris Cité, Montrouge, France Department of Restorative Dentistry, APHP, Dentistry Service at the Charles Foix Hospital, Ivry-sur-Seine, France Private Practice, Paris

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Page 1: The scalpel finishing technique: a tooth-friendly way to

CLINICAL RESEARCH

228THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

Correspondence to: Elaine Kup, DDS, MSc

Alameda Dos Aicas 927/ap 142, Indianapolis SP, Sao Paulo, 04086002, Brazil; E-mail: [email protected]

The scalpel finishing technique:

a tooth-friendly way to finish dental

composites in anterior teeth

Elaine Kup, DDS, MSc

Associate Assistant, Department of Restorative Dentistry and Endodontics,

Faculty of Dental Surgery, Paris Diderot University, Paris, France

Member of the Biomimetic Pole of the Dentistry Service, Charles Foix Hospital,

Ivry-sur-Seine, France

Private Practice, Sao Paulo, Brazil

Gil Tirlet, DDS, PhD

Senior Lecturer, Department of Prosthetic Dentistry, Faculty of Dental Surgery, Paris

Descartes University, Sorbonne Paris Cité, Montrouge, France

Department of Restorative and Prosthetic Dentistry, APHP

Head of the Biomimetic Pole of the Dentistry Service, Charles Foix Hospital,

Ivry-sur-Seine, France

Private Practice, Paris

Jean-Pierre Attal, DDS, PhD

Senior Lecturer, Department of Biomaterials (URB2i, EA4462), Faculty of Dental Surgery,

Paris Descartes University, Sorbonne Paris Cité, Montrouge, France

Department of Restorative Dentistry, APHP, Dentistry Service at the Charles Foix Hospital,

Ivry-sur-Seine, France

Private Practice, Paris

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229THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

Abstract

Optimal results can be obtained on di-

rect restorations by the application of

layering procedures that combine the

accurate morphological insertion of re-

storative materials with the knowledge

of the optical and mechanical properties

of both composite resin and natural hard

dental tissue. Even if the finishing pro-

cedures on restorations, such as mar-

gination (the trimming of margins), are

minimized by anatomical layering tech-

niques, finishing can still be highly com-

plicated due to a number of pre-finishing

sequences using specific instruments

proposed in the literature, which include

finishing burs and abrasive discs. Fin-

ishing procedures performed with a

scalpel on polymerized direct compos-

ite restorations can improve the quality of

the final sculptured surface by develop-

ing natural contours and characteristics

and by removing the excess restorative

material at the tooth-structure margin.

Enhanced movement control and fine

fingertip perception of the surface tex-

ture while moving the scalpel blade al-

low the operator to detect and cut the

excess composite material during the

margination procedure and to refine the

final anatomy. Avoiding the use of finish-

ing burs during finishing procedures on

direct composite restorations may save

adjacent enamel surfaces from abrasive

damage. The composite surface and

margins may also benefit from using the

scalpel finishing technique, considering

the potential risk of excess removal and

surface crazing that the improper use of

finishing burs could cause to composite

material. The purpose of this article is to

propose and describe the scalpel finish-

ing technique step by step, as well as

to briefly discuss the advantages of its

application within the limits of a clinical

case report.

(Int J Esthet Dent 2015;10:228–245)

229THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

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CLINICAL RESEARCH

230THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

Introduction

The latest composite resins have evolved

to become some of the most versatile

materials in the science of dental res-

torations. Available in a wide range of

viscosities correlated mostly to filler con-

tent, hybrid (microhybrid), microfill, and

nanofill/nanohybrid composite formula-

tions offer a choice of different mechani-

cal and physical properties for a variety

of clinical applications.1 These materials

are also able to provide some potential

additional benefits, such as proper mar-

gin adaptation, less structure wear, less

long-term staining, and higher surface

polishability.

Unfortunately, studies have shown

that bonded composite restorations are

not only sensitive to certain materials but

also to particular techniques.6 Even if

the finishing restorative procedures are

minimized by anatomical layering tech-

niques, a composite restoration must

undergo proper finishing and polishing

procedures once it is placed and fully

cured in order to ensure perfect con-

tours and longevity, minimize plaque ac-

cumulation, and achieve the expected

esthetic results.

Finishing and polishing procedures

have to be considered in addition to all

the other known parameters relating to

the longevity of composite restorations.

Improper finishing and overheating

caused by repeated polishing have the

potential to jeopardize the restoration

surface and the marginal integrity of the

restoration. Even in the case of minimal

mechanical finishing, heat and vibration

may damage the surface of the com-

posite and can lead to the formation of

microcracks along the material surface

and subsurface, which would decrease

the longevity of the restoration.7,8

Some studies have shown that the

use of diamond finishing burs could lead

to crazing and composite loss, creating

surface irregularities.9,10 Microfill com-

posites can develop microfractures

when finished with carbide burs.11 Al-

though microhybrid composites have

been shown to “pluck out” during fin-

ishing and polishing procedures, they

have also been shown to be more re-

sistant to surface microfractures during

finishing procedures when compared to

other classes of composites.11,12 Nano-

filled composites apparently exhibit the

lowest incidence of surface defects after

finishing and polishing, regardless of the

polishing system used.4

Excessive removal of composite ma-

terial can lead to voids and margin de-

fects of the material, as well as to poor

esthetics. Marginal breakdown will re-

sult in early wear, discoloration, plaque

retention, periodontal tissue irritation,

and the patient’s tactile detection of the

restoration.3 Clinical and in vitro stud-

ies have shown that residual surface

roughness of composites can influence

plaque retention, which usually results in

superficial staining, gingival inflamma-

tion, and secondary caries.

Nevertheless, apart from the potential

damage to the composite surface that

must be considered during these pro-

cedures, great caution should also be

taken not to overwear sound surround-

ing tooth structure with finishing carbide

or diamond burs and abrasive discs

during finishing procedures.16 Adjacent

enamel should be preserved mostly in-

tact, and tertiary anatomy must be cre-

ated on the composite surface to meet

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KUP ET AL

231THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

and mirror the adjacent enamel, and not

the other way around.

Excessively uniform and even brilliant

surfaces are mostly found in age-worn

teeth. Removing and over-smoothing

adjacent enamel structure during exces-

sive or repeated finishing procedures

with abrasive instruments can erase

the original, beautiful, natural texture of

the enamel surface, creating an “aged”

tooth aspect particularly on the buccal

surfaces of anterior teeth. The natural

microtopography of the enamel should

be respected and taken into account to

achieve more visually pleasing esthetic

results.

In this article, for the first time, we pro-

pose the use of a scalpel blade instead

of traditional abrasive finishing burs to

remove any overhang of polymerized

restorative material, as well as for con-

touring direct composite restoration

margins and refining sculpture details

during finishing and before polishing

procedures.

Brief discussion: finishing

and polishing

There is some misunderstanding in the

literature, as well as in professional den-

tal language, about the difference be-

tween the procedural steps of finishing

and polishing. Although they are often

mentioned together, these two proced-

ures actually have unique and specific

goals. A chronological progression of

steps that needs to be respected always

starts with gross reduction and contour-

ing and ends with final polishing. Basi-

cally, we can divide the 2-step finishing

and polishing procedures into 3 main

steps: finishing, margination, and pol-

ishing.17

Finishing, in the dental context, is the

generic concept of removing excess ma-

terial while defining anatomic contours.

Margination or recontouring is part of the

finishing process. It refers to the removal

of the excess, overhanging restorative

material at the cavosurface margins,

creating a smooth continuity from one

surface to another. During the process

of margination, both technique and the

finishing instruments used have to be

carefully chosen to ensure maximum re-

spect for the adjacent dental tissue and

structure while reproducing the normal

anatomic shape of the restored area.

In most cases, dentists use sequential

diamond finishing burs to perform the

finishing processes of contouring and

adjusting.

Polishing refers to the process of

smoothing away tiny residual surface

defects left behind after finishing and

margination.

Our experience has shown that gross

reduction, coarse finishing, and margin-

ation using a scalpel blade could stra-

tegically contribute to a reduction and

simplification of finishing steps, leaving

a pre-polished surface ready for final

polishing (Fig 1a). Due to the dynamics

of rotary instruments, damage that is dif-

ficult to control could occur on the sur-

face that these instruments touch. The

bur’s fast, abrasive action immediately

widens the initial area with which it comes

into contact, which may result in more

material being removed than is desired

or is necessary, or in a flatter surface

design. When using a static instrument

such as a scalpel, due to the operator’s

better control of the working speed and

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CLINICAL RESEARCH

232THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

of the amount of surface affected, dam-

age to a hard substrate surface is lim-

ited to the area under the blade’s curve.

Further, particularly on the composite

surface, damage can be controlled and

stopped faster and more precisely with

a scalpel than when a high-speed rotary

instrument is being used.

The scalpel as a finishing

instrument

The use of a No. 12B scalpel blade to

remove excess or unbounded resin

from proximal areas has already been

described.1 In this article, we propose

to describe the use of a scalpel (mostly

finishing instrument, not only for excess

composite removal from areas that are

difficult to access, but also as an instru-

ment for cutting composite during finish-

ing. When used on polymerized direct

composite materials to define anatom-

ical contours (gross reduction, course

finishing, and margination), as well as

to refine surface sculpture, the scalpel’s

thin blade enables the operator to create

complex micro-anatomical details that

will lead to better light-reflecting kinet-

ics and tooth-restoration harmonization

without damaging the composite sur-

face or adjacent dental tissue. Finishing

with a blade compared to a diamond bur

will lead to a smoother micro-surface,

simplifying and shortening the polishing

procedures. Figure 1a shows a SEM im-

age of the microtopographic aspect of a

microhybrid composite surface that has

been entirely submitted to the action of

an approximate 30-degree angle to the

Fig 1a SEM image (Biomaterial laboratory, Par-

is V University, Montrouge, France) of a microhy-

brid composite (Enamel Plus HFO-GE2, Micerium)

surface entirely submitted to the peeling action

achieved when compared to the surface trimmed

by a red diamond finishing bur (Fig 1b).

Fig 1b SEM image of a microhybrid composite

surface (Enamel Plus HFO-GE2, Micerium) submit-

ted to the abrasive action of a red diamond finish-

ing bur, applying finishing movements parallel to

the surface. The surface topography shows a much

rougher texture when compared to the finish ob-

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233THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

composite in a horizontal peeling move-

ment to simulate a gross reduction ac-

tion. Figure 1b shows a SEM image of

the same microhybrid composite, sub-

mitted this time to a fine grit red-ring fin-

As the scalpel blade will only cut com-

posite material when used on a hard

tooth surface, it can be considered a

material-selective and tooth-friendly fin-

ishing instrument.

Case report

Step-by-step description of

the scalpel finishing technique

A 17-year-old woman, having just fin-

ished orthodontic treatment, consulted

for an esthetic solution on her conoid

maxillary incisor tooth (or peg tooth)

(Figs 2a and 2b).

With a view to the future restoration,

the orthodontist had left a symmetric

space equivalent to the width of the nor-

mal contralateral tooth, distal and me-

sial to the conoid tooth. The space was

maintained (and still is to this day) by

means of a fixed wired palatal retention

(Figs 3a and 3b).

Therapeutic options

A minimally invasive bonded ceramic

veneer on a modified prepless tooth in-

tervention was proposed to the patient,

considering the expected longevity, op-

timal esthetic results, and tissue pres-

ervation provided by this restoration.

Nevertheless, the patient’s mother asked

for a less expensive and more direct so-

lution.

Fig 2a Initial photo of maxillary teeth

taken a few weeks after the removal of or-

thodontic fixed appliances.

Fig 2b Frontal view of anterior teeth in

maximum intercuspation (MI). Patient dis-

plays a shallow vertical overlap.

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234THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

We then proposed a direct composite

bonded restoration with no bur removal

of tooth structure (prepless technique)

with a prior direct mock-up to guide

the layering of the composite material

(template technique). Information was

given to the patient concerning prob-

able shorter longevity of this type of res-

toration, considering its large volume,

and less predictable esthetic results

due to this direct technique when com-

pared to ceramics. Both patient and

mother preferred this second solution.

Considering the age of the patient and

the possibility of repairing composites,

and following the philosophy of maxi-

mum tooth preservation over a lifetime

as proposed in the Therapeutic Gradi-

ent,18 we proceeded with a direct adhe-

sive restoration.

Before enamel dehydration takes

place, information for color analyses

was noted and preoperative macro

pictures were taken (Figs 2a to 3c).

Using the computer’s image tool de-

vice, we created a mirror image by

horizontally flipping the image of the

normal lateral (contralateral) tooth

Fig 3 (a and b) Right (conoid) tooth and left lateral views in MI occlusion. (c) Close-up view of the

normal contralateral tooth that will serve as a reference to create a symmetric morphology on the conoid

contralateral tooth. (d) Projection of translucent mirror image of normal contralateral reference on the peg

tooth. The image allows previsualization of the composite adjunction that will be necessary to reproduce

the desired anatomic contours.

a b

c d

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235THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

that will serve as a reference and

projecting it onto the image of the co-

noid tooth. After redimensioning both

images to fit each other, we used

the opacity image tool to lower the

opacity of the normal lateral so that

this tooth image became translucent.

This method enables the visualization

of the underlying morphology of the

peg tooth (Fig 3d) and the previsu-

alization of the position and volume

of composite adjunction that will be

needed to achieve the desired final

morphology. Later, moving the opac-

ity image tool to maximum opacity

and having this image on the com-

puter screen next to the chair gives

the dentist a constant predehydration

view of the color features, as well as a

model for macro- and microanatomy

reproduction.

A mock-up was prepared using a

freehand technique by applying com-

posite directly onto the conoid tooth

without any adhesive procedure. A

near-symmetrical morphology to the

contra-maxillary lateral was achieved

(Figs 4a to 4c). Once approved, this

outline was registered using a rigid

silicone impression that was sec-

tioned by a scalpel into a matrix or

lingual template, which served as a

guide for the multilayer technique that

followed (Figs 4d and 4e).

Following rubber dam isolation, grit

blasting of the enamel surface was

particles). No bur abrasion was em-

ployed. A total-etch, 2-step adhesive

procedure (Optibond Solo Plus, Kerr)

followed, and restoration was per-

formed according to the principles

Fig 4 (a and b) Direct mock-up made on the peg

tooth (close vision and occlusion testing). (c) Near-

symmetrical morphology to the contra-maxillary lat-

eral was achieved by a freehand mock-up on the

conoid lateral. This morphology was viewed and

approved by the patient (esthetic validation).

a b

c

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CLINICAL RESEARCH

236THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

of the anatomical composite 3D lay-

ering technique (Vanini).19 Blue pig-

ment effects were used to create the

translucent and opalescent effects

on the incisal third. The “halo effect”

was reproduced with dentinal body

composite, and the “cloudlike” white

stains of hypomineralization were cre-

ated with intensive masses20 applied

on the dentin core, before insertion of

the final enamel composite layer. The

restoration was then ready for finish-

ing and polishing procedures (Figs 4f

and 4g).

The scalpel finishing technique

This case was chosen as an example

to describe this technique because, as

all surfaces of the tooth were implicated,

various possibilities and ways of using

the scalpel as a sculpting/finishing instru-

ment could be demonstrated. However,

in our opinion, there are more indications

where this technique can be used to fin-

ish partial direct composite restorations.

1. Initial anatomic definition and gross

contour

The conoid tooth presents a cervical ar-

ea narrower than a normal lateral incisor.

Fig 4 (continued) (d) Silicone template: impression of the mock-up. (e) Silicone template in place

after removing the mock-up. (f) Palatal wall and first dentine composite increments. (g) Composite restor-

ation roughly completed.

d e

f g

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KUP ET AL

237THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

Therefore, to develop a natural contour

of the emergency profile, additive com-

posite has to be extended slightly into

the embrasures on the proximal mar-

gins. Transparent matrices applied in the

interproximal region to guide the com-

posite insertion tend to give an unnatural

profile that is too straight. Recontouring

using the scalpel blade starts by remov-

ing overhangs (any excessive restora-

tive and adhesive material) present in

the gingival interproximal embrasures.

At the same time, the correction of the

composite interproximal and cervical flat

profile is precisely performed using the

point of the blade. The extreme lateral

edge of the blade, adjacent to its point,

is used to reshape this cervical area by

cutting any excess composite to create

a rounded, anatomical contiguity of the

restoration material with the adjacent

dental cervical structure. For this result

to be achieved, the blade should be

positioned at an approximate 30-degree

angle with the surface of the restoration

gripped between the fingers in a pencil

grip. A firm, sliding/peeling movement

is performed from the composite to the

tooth structure, moving as one would

Figs 5a and 5b Recontouring of cer-

vical and interproximal embrasures.

Fig 6a and 6b Always ensure a stable fingerhold on the tooth and grip the scalpel as close as pos-

sible to the blade; in this case, the grip is mostly between the middle and index finger and the thumb, like

a pencil grip.

a b

a b

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238THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

when handling a hand-trimming chisel,

to achieve the desired anatomic shape.

It is very important to always ensure

and maintain a stable fingerhold on the

tooth while handling the scalpel. One

should grip the instrument as close as

possible to the blade (Figs 6a and 6b) to

ensure stability and to prevent the blade

from accidentally slipping onto the adja-

cent soft tissue.

2. Gross reduction and margination

Margination starts by applying the same

firm, continuous, sliding/cutting move-

ment of the blade. Excessive compos-

ite material is removed by peeling. A

smooth composite–enamel margin tran-

sition is achieved by sliding the blade

so that the lateral cutting part of its tip is

always in contact with the interface be-

tween restoration and tooth (Fig 7). The

enamel surface will “guide” the blade.

As the scalpel will not cut the enamel,

any roughness or overhanging compos-

ite and non-bonded material still present

on these margins will be trimmed away.

The adaptation of the margin is

achieved by smoothly sliding the edge of

the blade. There should be no remaining

gaps or excess. At this point, the macro-

anatomic contour of the tooth can be re-

confirmed or refined. A straighter mesial

profile and rounder distoincisal outline

can be slightly redefined by the blade.

Also, some corrections to the V-shape

openings of mesio- and distoincisal an-

gles (Fig 8) can be precisely performed

-

stroying the convex form of the tooth’s

outline or endangering the surface of the

adjacent teeth, or the contact surface in

the case of interproximal areas.

3. Surface vertical anatomy

Width illusion is key when it comes to

symmetry in restorations.21 The percep-

tion of the width and length of a tooth

largely depends on the position, form,

and cervical convergence of the two

buccal vertical transitional line angles.

Normally, these features have already

been defined and sculpted during the

composite build-up stage, taking into

account symmetry with the contralateral

tooth. Despite this, some corrections to

the convex anatomic aspects often have

Fig 7 Removing excess composite material from

the cervical tooth margins.

Fig 8 Refining the distoincisal angle profile.

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239THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

to be made during the finishing stages

of the restoration.

In classical finishing technique, cor-

rections to the form and position of ridg-

es and lines are usually performed using

fine grit diamond finishing burs. With the

scalpel finishing technique, we suggest

this procedure. These line angles can

easily be pushed and replaced more

distally or medially with the blade by us-

ing vertical cutting/peeling movements

(Figs 9a and 9b). Rounding or accen-

tuation of the profiles of the angles can

be obtained by scratching vertically or

horizontally with the blade (Figs 9c and

9d). An unwanted over-homogenization

on the profile of the transition line crest

may be easier to avoid using a blade

rather than a finishing bur, where, in the

latter case, the homogenization occurs

all at once (Fig 9e).

Figs 9a to 9e Repositioning and refining transition line angles.

a b c

d e

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240THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

Figs 10a to 10f Defining facial macroanatomic limits of eminences of rounded mamelons and creating

asymmetric details, as observed in natural enamel topography. The point of the scalpel is very useful for

reproducing the smooth grooves.

a

c

e

b

d

f

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241THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

4. Other macrogeographic aspects

and the incisal shape

The profile of the incisal edge and the

delicate shape of the rounded emi-

nences of the mamelons are accentu-

ated in symmetry with the collateral tooth

(Figs 10a and 10b). The fissure-shaped

edge (reunion of developmental lobes)

between the mamelons is worked on with

the blade’s fine point, finding its contigu-

ity on the vertical fine grooves (Figs 10c

and 10d). Shallow, smooth depressions

can be seen between the lobes on the

buccal face of the tooth. Those features

may be sculpted using the round part of

the blade (Fig 10e). The incisal third pro-

file is slightly rounded by the blade, pro-

ducing a minimal incisal “plane break-

down” on the buccal surface (Fig 10f).

5. Palatal anatomic aspects

Palatal anatomic aspects can be cor-

rected using either rotary football-

shaped diamond or carbide burs. Ordi-

nary scalpel blades are not sufficiently

small or rounded enough. It may take

more time, particularly for beginners of

this technique, to refine concavity sculp-

tured lingual aspects of tooth anatomy.

The palatal surface is a region that is dif-

ficult access, with some teeth presenting

very pronounced concavity. The palatal

finishing of this lateral was all done us-

ing a scalpel (Fig 11) and discs, but a

combined technique with rotary round-

shaped abrasive points or burs could al-

so be necessary. Scalpel blade No. 12B

can be useful to access some palatal

areas, such as interproximal palatal em-

brasures and cervical ridges adjacent to

the gingival area.

6. Palatal sculpture

To finish palatal sculpture, the incisal,

slope-like angle on the lingual side is

also refined by active sliding move-

ments of the blade, as if peeling the in-

cisal edge while forming an approximate

40-degree-angle slope with the long ax-

is of the clinical crown. Obviously, this

incisal slope angle may vary between

teeth, depending on variations in crown

anatomy and tooth contacts. In this area,

the anatomic shape has to be custom-

ized to perfectly fit the incisal guidance,

including wear, chipping, etc. Normally,

due to physiological movements during

incisal guidance, the incisal edge pre-

sents some worn surfaces. The tooth

shown in Fig 10e, as an example, is a

young lateral that still presents its round-

ed slope shapes almost intact.

Fig 11 Correcting the palatal concavity with the

curved part of the blade. Cingulum anatomy may

be carved or refined by employing the edge of the

blade.

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242THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

7. Tertiary horizontal anatomical features

Various other tertiary horizontal anatom-

ical features may also be reproduced

employing the scalpel on the facial sur-

face. Refining macro- and micro-surface

topographic aspects interferes with the

surface reflective behavior of the light,

allowing a more diffused type of reflec-

tion (Fig 12).

Particularly in younger dentition, the

microanatomic aspects, as vertical

and horizontal striated lines, produce a

more invisible restoration with a natural

blended final effect. Customized natural

strias (grooves) may be created using

the blade in a drawing action.

Buccal face microanatomy may also

be effectively created using a combined

scalpel and bur technique, or even just

finishing with a bur. However, in our

opinion, the use of a bur for the finish-

ing steps should ideally be limited to the

composite surfaces far from the restor-

ation margins.

Polishing

The restoration was polished using abra-

sive strips, abrasive polishing discs, sili-

con carbide polishing brushes, and felts

with fine and extra-fine polishing pastes

(Figs 13a to 13c). During polishing, soft-

er shapes can easily be obtained with

abrasive strips applied directly onto the

surface using finger friction (Fig 13d).

This procedure results in a more natural

look, as if the tooth has been submitted

to some physiological wear, or wear that

would result from the use of an abrasive

toothbrush.

Results analysis

As can be seen in Figs 14a and 14b,

anatomy, characteristics, and surface

reflections are in harmony with the ad-

jacent teeth. The maxillary laterals allow

for some asymmetry, and small differ-

ences between these teeth play an im-

portant role in a natural appearance.

When carefully observed (Figs 14a

and 14b), one can notice a bulging re-

flective surface emerging on the center

of the buccal face of this restored tooth.

Actually, this region corresponds to the

original natural convex surface of the co-

noid tooth, emerging from the center of

the restoration, which was left unharmed.

If finishing burs were used rather than a

scalpel to refine the sculpture on the buc-

cal surface of this tooth, this protruding

surface of enamel would end up being

flattened by abrasive subtraction during

the finishing process. This goes to show

how the scalpel technique respects the

Fig 12 Refining central lobe anatomy.

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KUP ET AL

243THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

Figs 13a to 13d Final polishing procedures.

Fig 14 (a) Close mesial facial view of the restoration im-

mediately the removal of the rubber dam. A bulging surface is

observable on the buccal face of the restored lateral. (b) Front

view of anterior tooth, 1 week later.

a

c

b

d

a

b

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CLINICAL RESEARCH

244THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

Conclusions

It is known that finishing procedures can

be minimized and better results can be

achieved by adding the correct volume

of composite material while employing a

careful technique to achieve incremen-

tal build-up. However, when it is neces-

sary to remove composite material after

final polymerization to achieve the de-

sired anatomy and contours, finishing

burs have the potential to harm sound

surrounding dental tissue. Burs could

also jeopardize composite margins and

the anatomic detail created on the resin

composite surface. To avoid these is-

sues, the scalpel finishing technique

can be used to trim and finish compos-

ite margins. The following advantages

can be potentially obtained using this

technique:

Immediate surrounding enamel is left

unharmed by the abrasive process.

By minimizing the use of sequential

diamond finishing burs, particularly on

composite margins, less composite

material is damaged or unnecessarily

removed in this delicate junction area,

consequently improving the resist-

ance and longevity of the restoration.

The technique can simplify the fi-

nal polishing procedures, leaving a

smoother composite surface that is

easier to polish immediately after the

finishing stage.

The simplicity and precision of the

technique, along with the esthetic re-

sults that can potentially be achieved,

make it a reasonable and safe alter-

native to the use of final finishing burs.

Apart from the predictability and time-

saving factors, the technique could

be considered a minimally invasive

Fig 15a Final photo showing maxillary anterior

teeth with equilibrated proportions.

Fig 15b Final dental gingival photo of anterior

teeth in maximum interception. Good harmony of

form, color, and reflections can be seen.

Fig 15c Patient’s smile at 1-week recall control

appointment.

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KUP ET AL

245THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY

dentistry approach for the finishing of

direct composite restorations.

In our opinion, the scalpel finishing tech-

nique is an accessible way of finishing

composites that could be proposed as

an everyday dental office method that

embraces the principles of minimally in-

vasive dentistry, ensuring maximum re-

spect for dental tissues while optimizing

and simplifying finishing procedures.

Acknowledgments

We thank all the laboratory technicians at the Mon-

trouge Biomaterial Laboratory of Paris Descartes (Par-

is V) University, Faculty of Dental Surgery, who have

contributed to this article by making it possible for the

authors to obtain the SEM images shown here. We

would also like to thank the clinicians for their kindness

and patience in reading and reviewing this article.

Disclosure statement

The authors declare that they have no conflicts of

interest concerning this article.

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