The Power of Pencil

Besides defining form and shape by silicone matrix and exploring the internal color anatomy, we need one other crucial thing in the treatment to look forward in time: a pencil.

Who would not wanna predict the future? In direct composite in anteriors curiosity is always there during treatment… In starting the procedure we use wax-up and mock-up to see where to end up. We light cure composite in the color mock-up to try to see the outcome. To see the incisal thickness and to identify the transitional lines in our restoration. And to see if they match….Before the polishing stage there is no luster so you can not judge if they are in the correct place by lack of light reflection. And after polishing you absolutely do not want to touch and redo. This article will guide you through the steps to the desired and defined end result.
The POWER of PENCIL in direct composite

style italiano styleitaliano dentistry

Fig.1
Initial situation: patient had been in a bus-accident 9 years ago and suffered a trauma on tooth #21. Tooth had an enamel-dentin fracture without pulp involvement and was partially displaced out of its pocket. It was repositioned and an endodontic treatment had to be performed by the endodontologist Marga Ree. 8 years later internal bleaching was performed because of discoloration that had developed over time. A composite build-up and fiber post were placed. Patient was referred and came in to improve the coronal part.

style italiano styleitaliano dentistry

Fig.2
Shape, form and colour were not satisfactory to the patient.

style italiano styleitaliano dentistry

Fig.3
The transition of composite into tooth structure is highly visible. Treatment goal defined: make an invisible restoration and tooth # 21 identical to tooth #11. By color mock-up it was decided to use an A2 body over an A3 dentin core combined with a translucent enamel and a white enamel shade.

style italiano styleitaliano dentistry

Fig.4
After taking preoperative photographs impressions were made in order to make a wax-up. The wax-up shows proper form and shape. Surface structure in wax is not necessary. The wax-up serves to make a mock-up and a silicone index to transfer the result intra-orally during the treatment.

style italiano styleitaliano dentistry

Fig.5
Patient had orthodontic treatment in the past. Palatal of the anteriors superior a fixed retainer was in situ. The silicone index was cut away thoroughly to fit. This is not always possible depending on the position of the retainer. A shadow on the incisal edge shows perfectly the edge has a certain thickness.

style italiano styleitaliano dentistry

Fig.6
After the restoration is made the rubber dam is removed and obvious roughness smoothed. A pencil is taken to draw the first line on the labial side of the incisal edge. The next line is on the palatal side of the incisal edge ending up with two lines.
All images illustrating the incisal part in this article are placed in operator view to see more clearly.

style italiano styleitaliano dentistry

Fig.7
This is also done on the intact tooth #11 to be able to compare both teeth.

style italiano styleitaliano dentistry

Fig.8
From a mirror view an obvious difference in incisal thickness can be seen. The restoration is bulky at the labial side. On the palatal side can be trusted: this side is completely based on the wax-up and silicone index by means of a palatal shell of composite.

style italiano styleitaliano dentistry

Fig.9
In close-up view it is easily seen that the labial pencil line is not in sync with the silicone matrix. The silicone matrix is leading because already approved by the patient and operator by mock-up.

style italiano styleitaliano dentistry

Fig.10
A Sof-Lex disc is used at low speed and no water to trim back the composite at the incisal third.

style italiano styleitaliano dentistry

Fig.11
The pencil lines are drawn again. The pencil is made long and draws its lines passively. Not with the tip but with the side.

style italiano styleitaliano dentistry

Fig.12
The putty put in place shows another reduction of the composite is needed and is performed by disc again.

style italiano styleitaliano dentistry

Fig.13
Pencil lines are passively drawn again.

style italiano styleitaliano dentistry

Fig.14
The silicone index is in sync with the labial pencil line. At this time the convexity of the labial surface can be checked knowing the incisal third is in the exact right position.

style italiano styleitaliano dentistry

Fig.15
The next step is getting your transitional lines deflecting the light in the right way. The right way in this case, with an intact perfect neighboring central incisor, can be seen clearly by using the pencil on tooth number 11. The goal defined. The pencil lines tell that the restoration has to be adjusted to match.

style italiano styleitaliano dentistry

Fig.16
To adjust a worn Sof-Lex disc can push the pencil line to outside, or….

style italiano styleitaliano dentistry

Fig.17
Pull the pencil line to inside, using low speed to keep full control.

style italiano styleitaliano dentistry

Fig.18
Draw again in order to check and adjust again. Transitional lines deflect the light in the end result. Asymmetry of these lines comparing #11 and #21 is just as disturbing to the eye as asymmetry in the outlines of both teeth.

style italiano styleitaliano dentistry

Fig.19
Small steps and repetition are key words to keep full control.

style italiano styleitaliano dentistry

Fig.20
To check symmetry of your pencil lines the interlinear distance can be measured with a digital caliper. Starting with the ideal width, fastening the caliper and transferring that width to the pencil lines on the restoration to compare and adjust.

style italiano styleitaliano dentistry

Fig.21
Now it is easily to be seen that the interlinear distance is too big and should be made smaller.The caliper measurement can be done on the incisal third, middle third and on the cervical. The digital caliper reads more precisely than the eyes can see.

style italiano styleitaliano dentistry

Fig.22
Getting there; the mesial pencil line needs just a little last adjustment to match the characteristically rounded shapes of tooth #11.

style italiano styleitaliano dentistry

Fig.23
While adjusting the transitional line with the disc and before checking with the pencil the appearance of a white powder dust line gives a clue on how the line is changing.

style italiano styleitaliano dentistry

Fig.24
The incisal thickness, facial curvature of the restoration creating convexity and the position of the transitional lines are correct. Ready for the next step: adding facial anatomy.

style italiano styleitaliano dentistry

Fig.25
The surface is rubbed with carbon articulating paper to see the effect of the diamond bur moving very softly and with very low speed creating the depressions of the secondary anatomy lobes. In this case the surface structure aimed for is subtle. To give the anatomy an organic form, an overused Sof-Lex disc can by used to slightly wipe out the marks that appear to be too strong.

style italiano styleitaliano dentistry

Fig.26
Tertiary anatomy like perikymata can be placed by moving a green Arkansas stone horizontally once by hand. Again subtle in this case.

style italiano styleitaliano dentistry

Fig.27
The multi-step polishing procedure starts with Sof-Lex spiral elastomer wheels. Starting with beige.

style italiano styleitaliano dentistry

Fig.28
Ending with the white one. Performed without water.

style italiano styleitaliano dentistry

Fig.29
Next step is to use an aluminum oxide paste together with a felt coated disc. The disc makes it easy to reach all corners of the restoration because of its flexibility.

style italiano styleitaliano dentistry

Fig.30
The big felt wheel can be used on the flat surfaces.

style italiano styleitaliano dentistry

Fig.31
Result after creating facial anatomy and polishing. Gingiva has not recovered yet.

style italiano styleitaliano dentistry

Fig.32
Final result. Residual cement of orthodontic treatment on tooth #11 will be removed in upcoming hygiene appointments. Note the recovery of the gingiva of the treated tooth (an anterior clamp had been used to isolate during the bonding procedure) and improvement in overall oral hygiene. The composite restoration is in complete harmony with the surrounding tooth structure making it invisible.

Conclusions

Using your pencil to be able to see features of the restoration makes sure you can adjust them at the right time in the treatment and prevents redoing at the end of your treatment when luster and gloss are already established. Trusting on the pencil lines can make you work fast and focused with a guaranteed good outcome. Feasible and repeatable.
The lines do not lie.

Bibliography

1. Gönülol N1, Yilmaz F. The effects of finishing and polishing techniques on surface roughness and color stability of nanocomposites. J Dent. 2012 Dec;40 Suppl 2:e64-70.
2. Manauta J, Salat A. Layers, An atlas of composite resin stratification. Chapter 10 Surface and polishing Quintessence Books, 2012
3.Schmitt VL, Puppin-Rontani RM, Naufel FS, Nahsan FPS, Coelho Sinhoreti MA and Baseggio W. Effect of the Polishing Procedures on Color Stability and Surface Roughness of Composite Resins. ISRN Dent. 2011; 2011: 617672 published online 2011 Jul 11.

RELATED CASES

Teeth Recontouring and Shape Perfecting

In this article we will show how we can use direct composite veneers to correct the alignment and also modify the shape of teeth to make a smile beautiful.