Part 41

The absence of acute inflammatory symptoms in the first variety distinguishes it from paronychia, whitlow, and gout. Rheumatoid arthritis begins in the joints, is associated with other symptoms; deformity of the fingers comes early in the disease, and there is a teno-synovitis with contraction.

The second variety might be taken for enchondroma or exostosis, but these growths increase much more slowly, involve only a limited portion of the bone, are of greater density, and are much more strictly circumscribed.

As a rule, especially in cases which are recognized early and treated {292} actively, the prognosis is good. Iodide of potassium should be used in combination with mercury.

Syphilis of the Teeth.--Syphilis of the teeth has its chief interest to the general practitioner from its very important bearing on diagnosis. As manifesting itself at an age when the child is not apt to present the active and unmistakable cutaneous and mucous lesions of the disease, and when, consequently, its recognition is often extremely difficult, this diagnostic importance is greatly increased.

The teeth of the first dentition, although exhibiting the usual signs of interference with nutrition in their irregular development, opaque and chalky enamel deficient in quantity and unevenly distributed, soft and friable dentine, incongruity of size individually and relatively, and proneness to decay, do not often display any distinctive evidence of syphilis. {293} The same conditions may, and often do, depend on other causes, and are commonly associated with various cachexiæ--the strumous, gouty, rheumatic, rachitic, etc.--and even with other slighter ailments tending to produce imperfect assimilation and malnutrition.

In the permanent teeth, likewise, the same condition may be due to the same causes. Stomatitis, however produced--by mercury, by gastro-intestinal derangements, by local irritation of any kind--is apt to result in imperfectly organized dental structures. Mercurial teeth, for example, are usually irregularly aligned, horizontally seamed, honeycombed, craggy, malformed, of an unhealthy dirty yellow color, separated too widely, and deficient in enamel. The diseases of childhood, especially the eruptive fevers, eclampsia, typhoid fever, etc., by temporarily arresting or greatly interfering with nutrition during the developmental period of the teeth, often cause horizontal furrows across their crowns, which are, of course, persistent throughout life, and mark indelibly the influence of such disorders on all the formative processes.

None of these conditions, however, are in the least degree characteristic of syphilis, the special expression of which in the mouth is to be found only in the permanent upper median incisors. For the recognition and description of the peculiarities of these teeth in the subjects of inherited syphilis we are indebted, as we are for so much else of inestimable value in the study of the disease, to Mr. Hutchinson. In 1863, in a memoir on Syphilitic Diseases of the Eye and Ear, he wrote as follows {294} concerning the symptoms which, in a suspected case, would aid in determining the diagnosis: "By far the most reliable amongst the objective symptoms is the state of the permanent teeth if the patient be of age to show them. Although the temporary teeth often, indeed usually, present some peculiarities in syphilitic children of which a trained observer may avail himself, yet they show nothing which is pathognomonic, and nothing which I dare describe as worthy of general reliance. The central upper incisors of the second set are the test teeth, and the surgeon not thoroughly conversant with the various and very common forms of dental malformation will avoid much risk of error if he restricts his attention to this pair. In syphilitic patients these teeth are usually short and narrow, with a broad vertical notch in their edges and their corners rounded off. Horizontal notches or furrows are often seen, but they, as a rule, have nothing to do with syphilis. If the question be put, Are teeth of the type described pathognomonic of syphilis? I answer unreservedly that when well characterized I believe they are. I have met with many cases in which the type in question was so slightly marked that it served only to suggest suspicion, and by no means to remove doubt; but I have never seen it well characterized without having reason to believe that the inference to which it pointed was well founded."

M. Fournier calls attention (Archives de Derm. et Syph., Sept. 25, 1883) to a cast (No. 48) to be found in the collection of M. Parrot in the museum of the Foundling Hospital at Paris. This displays the dentition of a child twenty-seven months old, in which the two upper median incisors are typical Hutchinson teeth. M. Fournier adds that later researches show unmistakably that the temporary teeth may be affected by hereditary syphilis in the same manner as those of the second dentition, although not more than one case of the former is recognized to fifteen or twenty of the latter. He thinks, however, that this proportion would be greatly modified if in the autopsies of young children the alveoli were opened to examine the embryonic teeth. M. Parrot by this means claims to have often discovered lesions of the milk teeth.]

As a matter of course, so positive a statement in a matter of such gravity and importance excited considerable criticism, and the views of Mr. Hutchinson have never been without earnest and often able opponents; but it is safe to say that time has only served to place them on a surer foundation and to enhance their value in the eyes of the profession. That they have undergone no material change in the mind of their distinguished author is shown by his expressions of opinion during the debate on syphilis in the London Pathological Society in 1876, and still later by the following memoranda which he gives as a guide in diagnosis:

"1. No special peculiarities are to be looked for in the first set of teeth.

"2. There can be no more serious blunder than to imagine that bad teeth in proportion to their badness of form are to be suspected of syphilis.

{295} "3. The upper central incisors are the only teeth which are positively characteristic. The others may afford corroborative testimony, but are not to be relied upon alone.

"4. The chief peculiarity is a general dwarfing of the tooth, which is both too short and too narrow, and, from its sides slanting together, presents a tendency to become pointed. This tendency to pointing is always defeated by the cutting off of the end, the truncation being usually effected in a line curved upward, so as to produce a single shallow notch. At the bottom of this notch the enamel is deficient and the dentine exposed, but there is no irregular pitting, as in stomatitis teeth.

"5. The malformations are unusually symmetrical and affect pairs of teeth. The two central incisors resemble each other, and the two laterals are also alike. If any defect passes horizontally across all the incisors at the same level, and affects them all alike, it is probably not due to syphilis.

"6. In syphilis the lateral incisors usually show little or no malformation.

"7. The occurrence of the peculiarities due to syphilis and those due to mercury in the same mouth are exceedingly common."

The great importance of the subject seems to me to justify one more quotation, as showing the opinion at a very recent date of men well qualified to judge of the correctness or inaccuracy of these statements. Mr. C. Macnamara and Dr. Thomas Barlow say: "The characters of the teeth are so valuable when present that it is important to have them clearly noted--the more so that, in spite of Mr. Hutchinson's clear description, they have been much misrepresented. It may be pointed out--(1) That only the upper median permanent incisors are characteristic, and sometimes only one of them is typical, of the disease; (2) that these teeth are generally a little apart, instead of being in apposition, and are more or less dwarfed; (3) that in a typical specimen the width of the cutting edge is narrower than the width of the tooth as it emerges from the gum; (4) that a typical syphilitic tooth presents a single notch, not a serrated margin; and that occasionally, if the notch has not been actually scooped out, there is a little lunula-shaped area which may readily become a notch; (5) finally, that although such teeth, when present, are absolutely pathognomonic, the existence of normal permanent upper median incisors by no means excludes the existence of hereditary syphilis."

I believe this may fairly be taken to represent the general belief at the present day among those best qualified to pronounce upon the merits of the case; and I may say that it is unqualifiedly my own opinion, arrived at after some experience and considerable investigation into the literature of the subject. It is not uncommon, however, to hear doubts expressed as to the value of this sign in the diagnosis of syphilis, and at intervals articles are written or papers read to prove that it is not of the uniform and distinctively conclusive significance that has been attributed to it.

M. Magitot, who has for some years been supposed to pay especial attention to this subject, has recently written an elaborate paper (Gazette des Hôpitaux, Sept. 29, Oct. 4, 11, and 18, 1881) to prove (1st) that dental erosions, as he calls them, are not due to syphilis; and (2d) that they are due to, or are almost invariably associated with, infantile convulsions. He has collected a number of interesting facts, but a very careful study of his article and inspection of his diagrams have convinced me that he does not recognize at all the special peculiarities of the Hutchinson teeth, but includes under his title of "erosion" a variety of widely-differing conditions. He has altogether misinterpreted Mr. Hutchinson's views as stated in his Memoirs on Certain Diseases of the Eye and Ear due to Inherited Syphilis, and represents him as at that time (1863) believing that the cause of the change in the incisors was a mercurial stomatitis. The quotation on p. 294 sufficiently refutes this absurdity. Of course the paper as an argument against the syphilitic origin of these teeth is without the slightest value.]

Corroborative evidence--which, to my mind, is very strong as coming from men whose opportunities for observation of dental peculiarities are almost unlimited--is found in the writings of those gentlemen who have devoted themselves to dental and oral surgery exclusively. Mr. Henry Moon says: "My observations on this subject extend over some twelve years, and include some hundreds of cases; and although, in some details as to the manner of causation, I may differ from the view published by Mr. Hutchinson (before knowledge on tooth-development was advanced as it is at present), yet I must coincide entirely with his general conclusions." "The question really is this: Is there one peculiar conformation of the teeth due to inherited syphilis and not produced by any other cause? The evidence in favor of an affirmative answer to this question appears to me to be so strong that I think the onus of disproof rests with the sceptics." These views were coincided in by the majority of the gentlemen to whom they were addressed, all of them dentists and surgeons of experience and repute, and who included men so well known to the profession as Mr. Oakley Coles, Mr. Samuel Cartwright, Mr. Charles Tomes, and others.

It may be considered as well established, then, that these peculiar teeth--stunted, abnormally narrow at the cutting edge, crescentically rounded with the convexity upward, and the surface inclined upward and forward instead of backward as in normal teeth, widely separated, but converging at their lower edges--are pathognomonic of hereditary syphilis. They are {297} often described as pegged, having been likened to a row of pegs stuck in the gums. This appearance is due to the fact that they are shortened, often projecting not more than half the normal distance from the gum, and are also widely separated; which abnormalities often affect the adjoining teeth as well, and sometimes the entire dentine. It has been asserted that other specific peculiarities are to be found associated with those of the incisors, and Mr. Moon describes as characteristic, and figures small dome-shaped first molars with suppressed angles and absence of enamel from the masticatory surfaces. He believes also that when the upper incisors are typical it is exceedingly rare for the lower incisors to be altogether unaffected.

A mistake which I know, from observation, to be frequently made is the confusing of the normal serrations of the cutting edges of recently-erupted normal incisors with the peculiar crescentic edges of the syphilitic teeth. It seems worth while to call especial attention to this, on account of the unpleasant consequences which often follow injudicious questioning based on such supposed syphilitic phenomena. Indeed, the space which has been devoted to this subject of syphilis of the teeth is well warranted, I am sure, by the fact that not only do diagnosis, prognosis, and treatment in cases of great severity, and in both children and parents, often depend upon a recognition of these peculiarities, but that in addition to the clinical and therapeutic problems there are others the solution of which is dependent upon the same knowledge on the part of the practitioner, and which may involve reputation, marital relations, and personal honor and happiness.

The approximate cause of these peculiarities in the incisors can hardly be said to have been demonstrated. Mr. Hutchinson thought at one time that they were due to a stomatitis or an alveolar periostitis, but he has since changed his mind as to that point, believing now that the syphilitic tooth is the result of an arrest of development in the central or first-formed portion of the dentine. The incisors being made up of these lobes or denticles, and dwarfing of the middle one taking place, the two lateral ones fall together. This accounts at once for the small size of the tooth, its shape of an inverted truncated cone, and its crescentic edge. If it were due to stomatitis, it would be more likely to be equally {298} distributed, syphilis in its late manifestations being notably unsymmetrical; there would be no rational explanation of the involvement of one or two teeth while those on either side so frequently escaped; if it were mercurial stomatitis, the enamel too would be involved, as is not usually the case in the syphilitic teeth. It is possible that the central incisors are chiefly affected because they, with the first molars--also affected according to Mr. Moon--and the lower incisors--not infrequently involved--are the first-formed teeth.

The most elaborate article upon syphilitic teeth which has appeared since Mr. Hutchinson's original memoir is one by Fournier, in which, after a very broad and comprehensive consideration of the subject, he arrives at the following conclusions: The hereditary influence of syphilis shows itself in the dental system in two ways, very unequal in point of diagnostic value--viz. first, by a retardation of evolution; second, by the arrest of growth and modifications of structure. The phenomena belonging to the second class may be grouped as follows: First, dental erosion. This is due to imperfect formation of the tooth, the result of a temporary stoppage in its development; but as it produces an appearance like that of worm-eaten wood, it has been called erosion, though in so far as the word conveys the idea of the wearing of a surface which has been previously normal, it is incorrect. The tooth affected with syphilitic erosion has never been normal. The different forms of erosion can be subdivided into groups according as they affect the face or the free edge or grinding surface of the tooth. Of those involving the face there are four types: Erosions en cupule, consisting of small excavations or cups in the surface of the crown; erosions en facettes, in which the surface presents a series of small planes, as though they had been filed; erosions en sillon when there is a linear excavation in the crown of the tooth in the shape of a transverse groove; and erosions en nappe, in which the whole surface is discolored, disorganized, and honeycombed.

A second group of erosions affects the free edge of the tooth, and includes the Hutchinson teeth, with several less important varieties. Dental erosions are multiple, symmetrical, maintain the same level on the crowns of corresponding teeth, and are situated at different heights on the crowns of teeth of different classes. It is evident, therefore, that they are the result of a morbid influence of a general character. There are three theories as to their etiology: (a) that they have no relation to syphilis, but are always connected with infantile eclampsia; (b) that they are exclusively the result of hereditary syphilitic influence; and (c) that they are simply ordinary lesions originating from syphilis with marked frequency, and even in one form--the Hutchinson tooth--appearing to originate only from it. This latter view is the one adopted by Fournier himself. Continuing to group the symptoms due to arrest of growth and modification of structure, we have, second, microdontism, or dwarfing and stunting of the teeth--pegged teeth; third, dental amorphism, in {299} which the teeth are strangely distorted or even transformed in type; fourth, dental vulnerability, or extreme susceptibility to all traumatic or disintegrating influences.

Interstitial Keratitis.--The frequency of this form of diffuse inflammation of the cornea, and the diagnostic significance which has been so positively attributed to it--and has been as positively denied--render it of special interest to the general practitioner, who is almost certain to meet with occasional cases, and should be prepared to recognize its possible relation with other, and often graver, conditions.

It begins, commonly, as a slight, diffused haziness situated in the substance of the cornea itself, usually not far from the centre, and at first affecting only one eye. This depends at this stage on the presence of a number of little distinct dots of inflammation, limited to circumscribed, almost microscopic, areas, but later, in a few days, these coalesce, and at the end of a few weeks the whole cornea will probably have become nearly or quite opaque, looking like ground glass. There is no ulceration, and but little congestion as compared with that seen in other inflammatory diseases of the eye, although in the majority of cases there is a fulness of the ciliary vessels and a little photophobia with pains around the orbit. This condition may persist for one or two months, after which the other cornea is nearly always attacked, and is similarly affected, although the disease is apt to pass through its different stages rather faster than in the first eye.

When the height of the disease is reached the corneæ are nearly opaque, a bare perception of light remaining, so that the patient is just aware of the difference between its presence and absolute darkness. Then the cornea which was first involved begins to clear; this is soon followed by improvement in the other one, which in the course of a year or two results in a return to fairly good sight, although in most cases there remain a slight haziness and an abnormal expansion of the cornea.